MaxView

XPK Start: Mon Apr 20 07:04:10 UTC 2026
PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used.
2026-04-20 07:04:34.674009: E external/local_xla/xla/stream_executor/cuda/cuda_platform.cc:51] failed call to cuInit: INTERNAL: CUDA error: Failed call to cuInit: UNKNOWN ERROR (303)
I0420 07:04:34.855295 139502449792832 max_utils.py:273] Attempting to initialize the jax distributed system...
I0420 07:04:43.895489 139502449792832 distributed.py:149] Starting JAX distributed service on [::]:8482
I0420 07:04:43.897724 139502449792832 distributed.py:172] Connecting to JAX distributed service on mt-15-ocdbt-true-rs-3ikq6-slice-job-0-0.mt-15-ocdbt-true-rs-3ikq6:8482
I0420 07:04:45.234313 139502449792832 max_utils.py:284] Jax distributed system initialized!
I0420 07:04:51.723086 139502449792832 max_utils.py:800] System Information: Jax Version: 0.9.2
I0420 07:04:51.723188 139502449792832 max_utils.py:801] System Information: Jaxlib Version: 0.9.2
I0420 07:04:51.723231 139502449792832 max_utils.py:802] System Information: Jax Backend: PJRT C API
TFRT TPU v6 lite
Built on Mar 4 2026 11:32:08 (1772652728) cl/878335365
I0420 07:04:51.723273 139502449792832 train_utils.py:348] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0420 07:04:52.426061 139502449792832 maxtext_utils.py:1551] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0420 07:04:52.426362 139502449792832 checkpointing.py:677] Setting up checkpoint logger...
I0420 07:04:52.426421 139502449792832 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True
I0420 07:04:52.426483 139502449792832 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None
I0420 07:04:52.426878 139502449792832 base_pytree_checkpoint_handler.py:441] Created BasePyTreeCheckpointHandler: use_ocdbt=True, use_zarr3=True, pytree_metadata_options=PyTreeMetadataOptions(support_rich_types=False), array_metadata_store=<orbax.checkpoint._src.metadata.array_metadata_store.Store object at 0x7edfcef1cc50>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0420 07:04:53.794626 139502449792832 checkpointing.py:265] Enabling policy for fixed interval checkpointing.
I0420 07:04:53.794863 139502449792832 checkpoint_manager.py:708] [process=4][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7eca7c505370>}, handler_registry=None
I0420 07:04:53.795136 139502449792832 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7eca7c505370>` for item "items" and save args `<class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeSaveArgs'>` and restore args `<class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>` to `_handler_registry`.
I0420 07:04:53.795195 139502449792832 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7edeadd3cc80>` for item "metrics" and save args `<class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>` and restore args `<class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>` to `_handler_registry`.
I0420 07:04:53.795241 139502449792832 composite_checkpoint_handler.py:505] Initialized registry DefaultCheckpointHandlerRegistry({('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeSaveArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7eca7c505370>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7eca7c505370>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7edeadd3cc80>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7edeadd3cc80>}).
I0420 07:04:53.795622 139502449792832 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34
I0420 07:04:53.795696 139502449792832 async_checkpointer.py:192] [process=4][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7eca7c1b7d80> timeout: 1200 secs and primary_host=0 for async checkpoint writes
I0420 07:04:55.692311 139379842463488 checkpoint.py:228] Read Metadata={'item_handlers': {'items': 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler'}, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776668529904500213, 'commit_timestamp_nsecs': 1776668577814483129, 'custom_metadata': {}} from gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_true/checkpoints/9/_CHECKPOINT_METADATA
I0420 07:04:55.944305 139379842463488 checkpoint_manager.py:1871] Missing metrics for step 9
I0420 07:04:55.988883 139502449792832 checkpoint_manager.py:1812] Found 3 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_true/checkpoints
I0420 07:04:56.544683 139502449792832 checkpoint_manager.py:929] [process=4][thread=MainThread] CheckpointManager created,  primary_host=0, CheckpointManagerOptions=CheckpointManagerOptions(save_interval_steps=1, max_to_keep=None, keep_time_interval=None, keep_period=None, should_keep_fn=None, best_fn=None, best_mode='max', keep_checkpoints_without_metrics=True, step_prefix=None, step_format_fixed_length=None, step_name_format=None, create=True, cleanup_tmp_directories=False, save_on_steps=frozenset(), single_host_load_and_broadcast=False, todelete_subdir=None, todelete_full_path=None, enable_background_delete=False, read_only=False, enable_async_checkpointing=True, async_options=None, multiprocessing_options=MultiprocessingOptions(primary_host=0, active_processes=None, barrier_sync_key_prefix=None), should_save_fn=None, file_options=FileOptions(path_permission_mode=None), save_root_metadata=True, temporary_path_class=None, save_decision_policy=FixedIntervalPolicy(interval=5), preservation_policy=LatestN(n=None), prevent_write_metrics=False, enable_should_save_is_saving_in_progress_check=True, enable_per_process_directory_creation=False, lightweight_initialize=False), root_directory=gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_true/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7eca7c59e450>
I0420 07:04:56.544853 139502449792832 checkpointing.py:301] Checkpoint manager created!
I0420 07:04:57.462141 139502449792832 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0420 07:04:57.462253 139502449792832 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0420 07:04:57.840832 139502449792832 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0420 07:04:57.840924 139502449792832 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0420 07:04:57.857082 139502449792832 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0420 07:04:57.857145 139502449792832 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0420 07:04:57.881572 139502449792832 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0420 07:04:57.881640 139502449792832 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 07:04:57.897986 139502449792832 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0420 07:04:57.898044 139502449792832 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 07:04:57.914187 139502449792832 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0420 07:04:57.914250 139502449792832 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 07:04:57.939591 139502449792832 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0420 07:04:57.939670 139502449792832 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 07:04:57.960627 139502449792832 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0420 07:04:57.960687 139502449792832 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0420 07:04:58.179750 139502449792832 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint
I0420 07:04:58.179864 139502449792832 checkpointing.py:581] restoring from this run's directory step 9
I0420 07:04:58.430176 139502449792832 event_tracking.py:70] [process=4] [sync] Started load checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_true/checkpoints/9.
I0420 07:04:58.685937 139502449792832 checkpointer.py:307] Restoring checkpoint from gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_true/checkpoints/9.
I0420 07:04:58.686375 139502449792832 event_tracking.py:125] [process=4] [sync] Finished blocking load in 0.26 seconds. Continuing load @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_true/checkpoints/9.
I0420 07:05:00.088348    1469 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0420 07:05:05.660292 139502449792832 jax_array_handlers.py:843] [process=4] /jax/orbax/read/worker/io/requested throughput: 283.317 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 5.57775616645813 s) (per-host)
I0420 07:05:05.664913 139502449792832 base_pytree_checkpoint_handler.py:130] [process=4] /jax/checkpoint/read/gbytes_per_sec: 264.773 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 5.977170944213867 s) (per-host)
I0420 07:05:08.687083 139502449792832 event_tracking.py:138] [process=4] [sync] Finished load in 10.26 seconds @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_true/checkpoints/9
I0420 07:05:08.687236 139502449792832 standard_logger.py:34] {'step': 9, 'event_type': 'restore', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_true/checkpoints', 'checkpointer_start_time': 1776668698.430079, 'checkpointer_duration_secs': 10.25712537765503, 'checkpoint_manager_start_time': 1776668698.1801052, 'checkpoint_manager_duration_secs': 10.50710153579712}
fsdp: 32
I0420 07:05:09.098513 139502449792832 maxtext_utils.py:1654]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   P('norm',)
    Physical:  (None,)
I0420 07:05:09.098638 139502449792832 maxtext_utils.py:1654]  params/params/decoder/layers/mlp/wi_0/kernel
    Shape:     float32[2048,16,7168]
    Logical:   P('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0420 07:05:09.098691 139502449792832 maxtext_utils.py:1654]  params/params/decoder/layers/mlp/wi_1/kernel
    Shape:     float32[2048,16,7168]
    Logical:   P('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0420 07:05:09.098748 139502449792832 maxtext_utils.py:1654]  params/params/decoder/layers/mlp/wo/kernel
    Shape:     float32[7168,16,2048]
    Logical:   P('mlp', 'layers', 'embed')
    Physical:  (None, None, 'fsdp')
I0420 07:05:09.098800 139502449792832 maxtext_utils.py:1654]  params/params/decoder/layers/post_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   P('norm', 'layers')
    Physical:  (None, None)
I0420 07:05:09.098843 139502449792832 maxtext_utils.py:1654]  params/params/decoder/layers/pre_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   P('norm', 'layers')
    Physical:  (None, None)
I0420 07:05:09.098902 139502449792832 maxtext_utils.py:1654]  params/params/decoder/layers/self_attention/key/kernel
    Shape:     float32[2048,16,16,128]
    Logical:   P('embed', 'layers', 'kv_heads', 'kv_head_dim')
    Physical:  ('fsdp', None, None, None)
I0420 07:05:09.098955 139502449792832 maxtext_utils.py:1654]  params/params/decoder/layers/self_attention/out/kernel
    Shape:     float32[16,16,128,2048]
    Logical:   P('heads', 'layers', 'kv', 'embed')
    Physical:  (None, None, None, 'fsdp')
I0420 07:05:09.098996 139502449792832 maxtext_utils.py:1654]  params/params/decoder/layers/self_attention/query/kernel
    Shape:     float32[2048,16,16,128]
    Logical:   P('embed', 'layers', 'q_heads', 'kv')
    Physical:  ('fsdp', None, None, None)
I0420 07:05:09.099034 139502449792832 maxtext_utils.py:1654]  params/params/decoder/layers/self_attention/value/kernel
    Shape:     float32[2048,16,16,128]
    Logical:   P('embed', 'layers', 'kv_heads', 'kv_head_dim')
    Physical:  ('fsdp', None, None, None)
I0420 07:05:09.099081 139502449792832 maxtext_utils.py:1654]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   P('embed_vocab', 'vocab')
    Physical:  ('fsdp', None)
I0420 07:05:09.099125 139502449792832 maxtext_utils.py:1654]  params/params/token_embedder/embedding
    Shape:     float32[32000,2048]
    Logical:   P('vocab', 'embed_vocab')
    Physical:  (None, 'fsdp')

I0420 07:05:09.580388 139502449792832 train.py:155] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0420 07:05:09.580478 139502449792832 train.py:155] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0420 07:05:09.595714 139502449792832 train.py:162] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0420 07:05:09.595777 139502449792832 train.py:162] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0420 07:05:20.478641 139502449792832 max_utils.py:791] Total memory size: 1.5 GB, Output size: 0.4 GB, Temp size: 1.1 GB, Argument size: 0.4 GB, Host temp size: 0.0 GB.
I0420 07:05:20.479428 139502449792832 metric_logger.py:301] number parameters: 1.104 billion
I0420 07:05:32.002796 139502449792832 checkpointing.py:772] Waiting for step 10 to finish before checkpoint...
I0420 07:05:32.156572 139502449792832 checkpointing.py:776] Waited 0.15375709533691406 seconds for step 10 to finish before starting checkpointing.
I0420 07:05:32.158885 139502449792832 checkpoint_manager.py:2009] [process=4][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0420 07:05:32.160897 139502449792832 checkpoint_manager.py:1512] [process=4] Saving checkpoint at step 10
I0420 07:05:32.162382 139502449792832 event_tracking.py:70] [process=4] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_true/checkpoints/10.
I0420 07:05:32.499304 139502449792832 signaling_client.py:364] Using JaxDistributedSignalingClient
I0420 07:05:32.500390 139502449792832 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0420 07:05:32.500448 139502449792832 replica_slices.py:424] Transferring arrays to host memory with options: use_replica_parallel=True, min_slice_bytes_for_replica_parallel=None, max_replicas_for_replica_parallel=None, enable_pinned_host_transfer=False
I0420 07:05:32.777740 139502449792832 base_pytree_checkpoint_handler.py:154] [process=4][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.278517s
I0420 07:05:32.777910 139502449792832 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/blocking_gbytes_per_sec: 5.463 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.28238344192504883 s) (per-host)
I0420 07:05:32.777966 139502449792832 base_pytree_checkpoint_handler.py:768] [process=4][thread=MainThread] Initiated Pytree async_save. Time taken: 0.282448s (batch_requests_ready=0.002156s, total_serialization_initiated=0.280219s, others=0.000073s)
I0420 07:05:32.778060 139502449792832 composite_checkpoint_handler.py:715] [process=4][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.286598s (all_items=0.000018s, per_item={'items': '0.00001788'}, temp_paths=0.286581)
I0420 07:05:32.778827 139502449792832 event_tracking.py:125] [process=4] [async] Finished blocking save in 0.62 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_true/checkpoints/10.
I0420 07:05:32.779159 139379272054528 async_checkpointer.py:76] [process=4][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 07:25:32.779123
I0420 07:05:32.787134 139502449792832 checkpoint_manager.py:1560] [process=4][thread=MainThread][step=10] Starting CheckpointManager Save Finalize thread=save_finalize
I0420 07:05:32.787389 139375513958144 async_checkpointer.py:280] [process=4][thread=save_finalize] Waiting for background save thread=async_save.
I0420 07:05:32.787538 139502449792832 standard_logger.py:34] {'step': 10, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776668732.15886, 'wait_for_prev_duration_secs': 6.127357482910156e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776668732.160936, 'checkpointer_blocking_duration_secs': 0.6183724403381348, 'get_old_steps_start_time': 1776668732.7793412, 'get_old_steps_duration_secs': 3.123283386230469e-05, 'checkpoint_manager_blocking_start_time': 1776668732.1569564, 'checkpoint_manager_blocking_duration_secs': 0.6305477619171143}
I0420 07:05:32.787649 139502449792832 checkpointing.py:408] Started an asynchronous checkpoint save for step 10
I0420 07:05:32.787701 139502449792832 max_utils.py:750] 
Memstats: After params initialized:
I0420 07:05:32.787753 139502449792832 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_16(process=4,(0,4,0,0))
I0420 07:05:32.787786 139502449792832 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_17(process=4,(1,4,0,0))
I0420 07:05:32.787821 139502449792832 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_20(process=4,(0,5,0,0))
I0420 07:05:32.787861 139502449792832 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_21(process=4,(1,5,0,0))
I0420 07:05:33.100154 139502449792832 metric_logger.py:196] completed step: 10, seconds: 11.523, TFLOP/s/device: 1.179, Tokens/s/device: 177.727, total_weights: 65536, loss: 6.833, lm_loss: 6.833, perplexity: 927.869
I0420 07:05:33.273315 139502449792832 metric_logger.py:196] completed step: 11, seconds: 1.096, TFLOP/s/device: 12.400, Tokens/s/device: 1869.033, total_weights: 65536, loss: 6.527, lm_loss: 6.527, perplexity: 683.659
I0420 07:05:33.420740 139502449792832 metric_logger.py:196] completed step: 12, seconds: 0.026, TFLOP/s/device: 529.816, Tokens/s/device: 79859.622, total_weights: 65536, loss: 6.265, lm_loss: 6.265, perplexity: 526.068
I0420 07:05:33.568119 139502449792832 metric_logger.py:196] completed step: 13, seconds: 0.154, TFLOP/s/device: 88.471, Tokens/s/device: 13335.330, total_weights: 65536, loss: 6.045, lm_loss: 6.045, perplexity: 422.001
I0420 07:05:33.572522 139502449792832 checkpointing.py:772] Waiting for step 15 to finish before checkpoint...
I0420 07:05:33.862511 139502449792832 checkpointing.py:776] Waited 0.28995633125305176 seconds for step 15 to finish before starting checkpointing.
I0420 07:05:33.865554 139502449792832 checkpoint_manager.py:2020] [process=4][thread=MainThread][step=10][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0420 07:05:38.115698 139376428304128 array_metadata_store.py:203] [process=4][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_true/checkpoints/10/items/array_metadatas/process_4
I0420 07:06:14.514570 139379272054528 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/gbytes_per_sec: 37.592 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.01900768280029 s) (per-host)
I0420 07:06:14.514678 139379272054528 async_checkpointer.py:90] [process=4][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.735412s.
I0420 07:06:23.639806 139379272054528 async_checkpointer.py:160] [process=4][thread=async_save] Background save thread done. Time taken: 50.860524s.
I0420 07:06:23.640084 139375513958144 async_checkpointer.py:288] [process=4][thread=save_finalize] Done with waiting for background save thread=async_save.
I0420 07:06:23.640201 139375513958144 async_checkpointer.py:298] [process=4][thread=save_finalize] No errors found in background save thread=async_save.
I0420 07:06:23.640250 139375513958144 checkpoint_manager.py:2137] [process=4][thread=save_finalize][step=10] CheckpointManager Save Finalize is syncing with other hosts...
I0420 07:06:23.642159 139375513958144 checkpoint_manager.py:2146] [process=4][thread=save_finalize][step=10] CheckpointManager Save Finalize is done on all hosts.
I0420 07:06:23.642356 139502449792832 checkpoint_manager.py:2032] [process=4][thread=MainThread][step=10][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=10.
W0420 07:06:23.642576 139502449792832 checkpoint_manager.py:1452] Waiting for previous save to complete took 49.776946 seconds. If this number is high, consider checkpointing less frequently.
I0420 07:06:23.644462 139502449792832 checkpoint_manager.py:1512] [process=4] Saving checkpoint at step 15
I0420 07:06:23.646746 139502449792832 event_tracking.py:70] [process=4] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_true/checkpoints/15.
I0420 07:06:24.358293 139502449792832 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0420 07:06:24.358402 139502449792832 replica_slices.py:424] Transferring arrays to host memory with options: use_replica_parallel=True, min_slice_bytes_for_replica_parallel=None, max_replicas_for_replica_parallel=None, enable_pinned_host_transfer=False
I0420 07:06:24.384248 139502449792832 base_pytree_checkpoint_handler.py:154] [process=4][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.027188s
I0420 07:06:24.384394 139502449792832 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/blocking_gbytes_per_sec: 50.397 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.030608654022216797 s) (per-host)
I0420 07:06:24.384444 139502449792832 base_pytree_checkpoint_handler.py:768] [process=4][thread=MainThread] Initiated Pytree async_save. Time taken: 0.030667s (batch_requests_ready=0.001763s, total_serialization_initiated=0.028840s, others=0.000065s)
I0420 07:06:24.384523 139502449792832 composite_checkpoint_handler.py:715] [process=4][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.035573s (all_items=0.000013s, per_item={'items': '0.00001311'}, temp_paths=0.035560)
I0420 07:06:24.385167 139502449792832 event_tracking.py:125] [process=4] [async] Finished blocking save in 0.74 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_true/checkpoints/15.
I0420 07:06:24.385429 139375513958144 async_checkpointer.py:76] [process=4][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 07:26:24.385406
I0420 07:06:24.398324 139502449792832 checkpoint_manager.py:1560] [process=4][thread=MainThread][step=15] Starting CheckpointManager Save Finalize thread=save_finalize
I0420 07:06:24.398622 139376428304128 async_checkpointer.py:280] [process=4][thread=save_finalize] Waiting for background save thread=async_save.
I0420 07:06:24.398806 139502449792832 standard_logger.py:34] {'step': 15, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776668733.865512, 'wait_for_prev_duration_secs': 49.77694630622864, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776668783.6445036, 'checkpointer_blocking_duration_secs': 0.7410242557525635, 'get_old_steps_start_time': 1776668784.3855507, 'get_old_steps_duration_secs': 3.0279159545898438e-05, 'checkpoint_manager_blocking_start_time': 1776668733.8631551, 'checkpoint_manager_blocking_duration_secs': 50.53560209274292}
I0420 07:06:24.398936 139502449792832 checkpointing.py:408] Started an asynchronous checkpoint save for step 15
I0420 07:06:24.399791 139502449792832 metric_logger.py:196] completed step: 14, seconds: 0.147, TFLOP/s/device: 92.192, Tokens/s/device: 13896.145, total_weights: 65536, loss: 5.864, lm_loss: 5.864, perplexity: 352.193
I0420 07:06:24.405954 139502449792832 metric_logger.py:196] completed step: 15, seconds: 0.147, TFLOP/s/device: 92.263, Tokens/s/device: 13906.903, total_weights: 65536, loss: 5.719, lm_loss: 5.719, perplexity: 304.661
I0420 07:06:29.655711 139373366474496 array_metadata_store.py:203] [process=4][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_true/checkpoints/15/items/array_metadatas/process_4
I0420 07:06:45.173888 139502449792832 metric_logger.py:196] completed step: 16, seconds: 50.832, TFLOP/s/device: 0.267, Tokens/s/device: 40.290, total_weights: 65536, loss: 5.605, lm_loss: 5.605, perplexity: 271.872
I0420 07:06:45.321469 139502449792832 metric_logger.py:196] completed step: 17, seconds: 20.622, TFLOP/s/device: 0.659, Tokens/s/device: 99.313, total_weights: 65536, loss: 5.517, lm_loss: 5.517, perplexity: 248.975
I0420 07:06:45.469204 139502449792832 metric_logger.py:196] completed step: 18, seconds: 0.152, TFLOP/s/device: 89.097, Tokens/s/device: 13429.596, total_weights: 65536, loss: 5.448, lm_loss: 5.448, perplexity: 232.333
I0420 07:06:45.616024 139502449792832 checkpointing.py:772] Waiting for step 19 to finish before checkpoint...
I0420 07:06:45.616745 139502449792832 checkpointing.py:776] Waited 0.0007398128509521484 seconds for step 19 to finish before starting checkpointing.
I0420 07:06:45.618909 139502449792832 checkpoint_manager.py:2020] [process=4][thread=MainThread][step=15][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0420 07:07:05.988435 139375513958144 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/gbytes_per_sec: 37.940 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 41.634613275527954 s) (per-host)
I0420 07:07:05.988548 139375513958144 async_checkpointer.py:90] [process=4][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.603045s.
I0420 07:07:14.840983 139375513958144 async_checkpointer.py:160] [process=4][thread=async_save] Background save thread done. Time taken: 50.455464s.
I0420 07:07:14.841271 139376428304128 async_checkpointer.py:288] [process=4][thread=save_finalize] Done with waiting for background save thread=async_save.
I0420 07:07:14.841418 139376428304128 async_checkpointer.py:298] [process=4][thread=save_finalize] No errors found in background save thread=async_save.
I0420 07:07:14.841469 139376428304128 checkpoint_manager.py:2137] [process=4][thread=save_finalize][step=15] CheckpointManager Save Finalize is syncing with other hosts...
I0420 07:07:14.843204 139376428304128 checkpoint_manager.py:2146] [process=4][thread=save_finalize][step=15] CheckpointManager Save Finalize is done on all hosts.
I0420 07:07:14.843389 139502449792832 checkpoint_manager.py:2032] [process=4][thread=MainThread][step=15][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=15.
W0420 07:07:14.843512 139502449792832 checkpoint_manager.py:1452] Waiting for previous save to complete took 29.224610 seconds. If this number is high, consider checkpointing less frequently.
I0420 07:07:14.844974 139502449792832 checkpoint_manager.py:1512] [process=4] Saving checkpoint at step 19
I0420 07:07:14.846941 139502449792832 event_tracking.py:70] [process=4] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_true/checkpoints/19.
I0420 07:07:15.560478 139502449792832 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0420 07:07:15.560569 139502449792832 replica_slices.py:424] Transferring arrays to host memory with options: use_replica_parallel=True, min_slice_bytes_for_replica_parallel=None, max_replicas_for_replica_parallel=None, enable_pinned_host_transfer=False
I0420 07:07:15.586678 139502449792832 base_pytree_checkpoint_handler.py:154] [process=4][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.027126s
I0420 07:07:15.586809 139502449792832 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/blocking_gbytes_per_sec: 50.501 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.03054523468017578 s) (per-host)
I0420 07:07:15.586855 139502449792832 base_pytree_checkpoint_handler.py:768] [process=4][thread=MainThread] Initiated Pytree async_save. Time taken: 0.030602s (batch_requests_ready=0.001640s, total_serialization_initiated=0.028901s, others=0.000061s)
I0420 07:07:15.586923 139502449792832 composite_checkpoint_handler.py:715] [process=4][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.034831s (all_items=0.000010s, per_item={'items': '0.00001049'}, temp_paths=0.034820)
I0420 07:07:15.587598 139502449792832 event_tracking.py:125] [process=4] [async] Finished blocking save in 0.74 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_true/checkpoints/19.
I0420 07:07:15.587943 139376428304128 async_checkpointer.py:76] [process=4][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 07:27:15.587904
I0420 07:07:15.591105 139502449792832 checkpoint_manager.py:1560] [process=4][thread=MainThread][step=19] Starting CheckpointManager Save Finalize thread=save_finalize
I0420 07:07:15.591329 139373894952704 async_checkpointer.py:280] [process=4][thread=save_finalize] Waiting for background save thread=async_save.
I0420 07:07:15.591474 139502449792832 standard_logger.py:34] {'step': 19, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776668805.618878, 'wait_for_prev_duration_secs': 29.224609851837158, 'time_between_consecutive_saves_sec': 21.97667908668518, 'checkpointer_blocking_start_time': 1776668834.8450115, 'checkpointer_blocking_duration_secs': 0.7430789470672607, 'get_old_steps_start_time': 1776668835.588108, 'get_old_steps_duration_secs': 2.5272369384765625e-05, 'checkpoint_manager_blocking_start_time': 1776668805.6169841, 'checkpoint_manager_blocking_duration_secs': 29.974452257156372}
I0420 07:07:15.591618 139502449792832 checkpointing.py:408] Started an asynchronous checkpoint save for step 19
I0420 07:07:15.591665 139502449792832 checkpoint_manager.py:2020] [process=4][thread=MainThread][step=19][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0420 07:07:20.890455 139373324510976 array_metadata_store.py:203] [process=4][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_true/checkpoints/19/items/array_metadatas/process_4
I0420 07:07:56.881030 139376428304128 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/gbytes_per_sec: 38.224 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 41.324729204177856 s) (per-host)
I0420 07:07:56.881147 139376428304128 async_checkpointer.py:90] [process=4][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.293087s.
I0420 07:08:05.629621 139376428304128 async_checkpointer.py:160] [process=4][thread=async_save] Background save thread done. Time taken: 50.041543s.
I0420 07:08:05.629898 139373894952704 async_checkpointer.py:288] [process=4][thread=save_finalize] Done with waiting for background save thread=async_save.
I0420 07:08:05.630024 139373894952704 async_checkpointer.py:298] [process=4][thread=save_finalize] No errors found in background save thread=async_save.
I0420 07:08:05.630065 139373894952704 checkpoint_manager.py:2137] [process=4][thread=save_finalize][step=19] CheckpointManager Save Finalize is syncing with other hosts...
I0420 07:08:05.631787 139373894952704 checkpoint_manager.py:2146] [process=4][thread=save_finalize][step=19] CheckpointManager Save Finalize is done on all hosts.
I0420 07:08:05.631958 139502449792832 checkpoint_manager.py:2032] [process=4][thread=MainThread][step=19][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=19.
I0420 07:08:05.632101 139502449792832 checkpoint_manager.py:2009] [process=4][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0420 07:08:05.633024 139502449792832 metric_logger.py:196] completed step: 19, seconds: 0.148, TFLOP/s/device: 91.905, Tokens/s/device: 13852.908, total_weights: 65536, loss: 5.391, lm_loss: 5.391, perplexity: 219.349
Per train step:
 Total TFLOPs: 13.59 
 split as 93.93% learnable weight flops and 6.07% attention flops
XPK End: Mon Apr 20 07:08:16 UTC 2026
EXIT_CODE=0

XPK Start: Mon Apr 20 20:21:42 UTC 2026
2026-04-20 20:21:46.523087: E external/local_xla/xla/stream_executor/cuda/cuda_fft.cc:467] Unable to register cuFFT factory: Attempting to register factory for plugin cuFFT when one has already been registered
WARNING: All log messages before absl::InitializeLog() is called are written to STDERR
E0000 00:00:1776716506.535655      10 cuda_dnn.cc:8579] Unable to register cuDNN factory: Attempting to register factory for plugin cuDNN when one has already been registered
E0000 00:00:1776716506.539338      10 cuda_blas.cc:1407] Unable to register cuBLAS factory: Attempting to register factory for plugin cuBLAS when one has already been registered
W0000 00:00:1776716506.550517      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776716506.550538      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776716506.550540      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776716506.550542      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
2026-04-20 20:22:05.733627: E external/local_xla/xla/stream_executor/cuda/cuda_platform.cc:51] failed call to cuInit: INTERNAL: CUDA error: Failed call to cuInit: UNKNOWN ERROR (303)
I0420 20:22:06.257936 133508389783360 max_utils.py:273] Attempting to initialize the jax distributed system...
INFO:2026-04-20 20:22:15,298:jax._src.distributed:140: Starting JAX distributed service on [::]:8482
I0420 20:22:15.298569 133508389783360 distributed.py:140] Starting JAX distributed service on [::]:8482
INFO:2026-04-20 20:22:15,300:jax._src.distributed:157: Connecting to JAX distributed service on mt-15-ocdbt-true-rs-0nsj7-slice-job-0-0.mt-15-ocdbt-true-rs-0nsj7:8482
I0420 20:22:15.300915 133508389783360 distributed.py:157] Connecting to JAX distributed service on mt-15-ocdbt-true-rs-0nsj7-slice-job-0-0.mt-15-ocdbt-true-rs-0nsj7:8482
I0420 20:22:16.279574 133508389783360 max_utils.py:284] Jax distributed system initialized!
I0420 20:22:23.161180 133508389783360 max_utils.py:800] System Information: Jax Version: 0.8.1
I0420 20:22:23.161286 133508389783360 max_utils.py:801] System Information: Jaxlib Version: 0.8.1
I0420 20:22:23.161326 133508389783360 max_utils.py:802] System Information: Jax Backend: PJRT C API
TFRT TPU v6 lite
Built on Nov 12 2025 14:16:36 (1762985796) cl/831091709
I0420 20:22:23.161359 133508389783360 train_utils.py:377] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0420 20:22:23.764917 133508389783360 maxtext_utils.py:1631] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0420 20:22:23.765520 133508389783360 maxtext_utils.py:1631] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0420 20:22:23.765702 133508389783360 checkpointing.py:688] Setting up checkpoint logger...
I0420 20:22:23.765753 133508389783360 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True
I0420 20:22:23.765809 133508389783360 pytree_checkpoint_handler.py:589] save_device_host_concurrent_bytes=None
I0420 20:22:23.766171 133508389783360 base_pytree_checkpoint_handler.py:415] Created BasePyTreeCheckpointHandler: use_ocdbt=True, use_zarr3=True, pytree_metadata_options=PyTreeMetadataOptions(support_rich_types=False), array_metadata_store=<orbax.checkpoint._src.metadata.array_metadata_store.Store object at 0x796c58d75370>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0420 20:22:25.116316 133508389783360 checkpointing.py:266] Enabling policy for fixed interval checkpointing.
I0420 20:22:25.116653 133508389783360 checkpoint_manager.py:709] [process=0][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x79594939f1d0>}, handler_registry=None
I0420 20:22:25.116906 133508389783360 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x79594939f1d0>` for item "items" and save args `<class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeSaveArgs'>` and restore args `<class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>` to `_handler_registry`.
I0420 20:22:25.116956 133508389783360 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7959493a6c00>` for item "metrics" and save args `<class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>` and restore args `<class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>` to `_handler_registry`.
I0420 20:22:25.116993 133508389783360 composite_checkpoint_handler.py:505] Initialized registry DefaultCheckpointHandlerRegistry({('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeSaveArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x79594939f1d0>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x79594939f1d0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7959493a6c00>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7959493a6c00>}).
I0420 20:22:25.117506 133508389783360 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.33
I0420 20:22:25.117585 133508389783360 async_checkpointer.py:177] [process=0][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x79587b51c180> timeout: 600 secs and primary_host=0 for async checkpoint writes
I0420 20:22:26.753283 133386022668032 checkpoint.py:228] Read Metadata={'item_handlers': {'items': 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler'}, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776716377866898877, 'commit_timestamp_nsecs': 1776716425034017261, 'custom_metadata': {}} from gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints/9/_CHECKPOINT_METADATA
I0420 20:22:27.003223 133386014275328 checkpoint_manager.py:1877] Missing metrics for step 0
I0420 20:22:27.036802 133508389783360 checkpoint_manager.py:1818] Found 3 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints
I0420 20:22:27.717666 133508389783360 checkpoint_manager.py:929] [process=0][thread=MainThread] CheckpointManager created,  primary_host=0, CheckpointManagerOptions=CheckpointManagerOptions(save_interval_steps=1, max_to_keep=None, keep_time_interval=None, keep_period=None, should_keep_fn=None, best_fn=None, best_mode='max', keep_checkpoints_without_metrics=True, step_prefix=None, step_format_fixed_length=None, step_name_format=None, create=True, cleanup_tmp_directories=False, save_on_steps=frozenset(), single_host_load_and_broadcast=False, todelete_subdir=None, todelete_full_path=None, enable_background_delete=False, read_only=False, enable_async_checkpointing=True, async_options=None, multiprocessing_options=MultiprocessingOptions(primary_host=0, active_processes=None, barrier_sync_key_prefix=None), should_save_fn=None, file_options=FileOptions(path_permission_mode=None), save_root_metadata=True, temporary_path_class=None, save_decision_policy=FixedIntervalPolicy(interval=5), preservation_policy=LatestN(n=None), prevent_write_metrics=False, enable_should_save_is_saving_in_progress_check=True, enable_per_process_directory_creation=False, lightweight_initialize=False), root_directory=gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x79594a35f020>
I0420 20:22:27.717881 133508389783360 checkpointing.py:302] Checkpoint manager created!
I0420 20:22:28.597167 133508389783360 nnx_wrappers.py:455] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0420 20:22:28.597273 133508389783360 nnx_wrappers.py:455] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0420 20:22:28.969982 133508389783360 attentions.py:1084] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0420 20:22:28.970075 133508389783360 attentions.py:1084] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0420 20:22:28.985769 133508389783360 attentions.py:1085] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0420 20:22:28.985840 133508389783360 attentions.py:1085] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0420 20:22:29.008433 133508389783360 attentions.py:1150] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0420 20:22:29.008497 133508389783360 attentions.py:1150] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 20:22:29.024258 133508389783360 attentions.py:1151] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0420 20:22:29.024317 133508389783360 attentions.py:1151] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 20:22:29.039920 133508389783360 attentions.py:1152] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0420 20:22:29.039980 133508389783360 attentions.py:1152] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 20:22:29.064581 133508389783360 attentions.py:1193] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0420 20:22:29.064656 133508389783360 attentions.py:1193] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 20:22:29.084189 133508389783360 linears.py:541] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0420 20:22:29.084256 133508389783360 linears.py:541] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0420 20:22:29.272218 133508389783360 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint
I0420 20:22:29.272328 133508389783360 checkpointing.py:582] restoring from this run's directory step 9
I0420 20:22:29.763758 133508389783360 checkpointer.py:304] Restoring checkpoint from gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints/9.
I0420 20:22:31.337494    1436 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0420 20:22:38.611063 133508389783360 jax_array_handlers.py:837] [process=0] /jax/orbax/read/worker/io/requested throughput: 217.107 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 7.278793811798096 s) (per-host)
I0420 20:22:38.616337 133508389783360 base_pytree_checkpoint_handler.py:129] [process=0] /jax/checkpoint/read/gbytes_per_sec: 202.465 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 7.816633939743042 s) (per-host)
I0420 20:22:42.994773 133508389783360 checkpointer.py:318] Finished restoring checkpoint in 13.47 seconds from gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints/9.
I0420 20:22:42.994974 133508389783360 standard_logger.py:34] {'step': 9, 'event_type': 'restore', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints', 'checkpointer_start_time': 1776716549.5204933, 'checkpointer_duration_secs': 13.474448919296265, 'checkpoint_manager_start_time': 1776716549.2725794, 'checkpoint_manager_duration_secs': 13.722364902496338}
fsdp: 32
I0420 20:22:43.395154 133508389783360 maxtext_utils.py:1740]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   PartitionSpec('norm',)
    Physical:  (None,)
I0420 20:22:43.395285 133508389783360 maxtext_utils.py:1740]  params/params/decoder/layers/mlp/wi_0/kernel
    Shape:     float32[2048,16,7168]
    Logical:   PartitionSpec('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0420 20:22:43.395342 133508389783360 maxtext_utils.py:1740]  params/params/decoder/layers/mlp/wi_1/kernel
    Shape:     float32[2048,16,7168]
    Logical:   PartitionSpec('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0420 20:22:43.395405 133508389783360 maxtext_utils.py:1740]  params/params/decoder/layers/mlp/wo/kernel
    Shape:     float32[7168,16,2048]
    Logical:   PartitionSpec('mlp', 'layers', 'embed')
    Physical:  (None, None, 'fsdp')
I0420 20:22:43.395458 133508389783360 maxtext_utils.py:1740]  params/params/decoder/layers/post_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   PartitionSpec('norm', 'layers')
    Physical:  (None, None)
I0420 20:22:43.395499 133508389783360 maxtext_utils.py:1740]  params/params/decoder/layers/pre_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   PartitionSpec('norm', 'layers')
    Physical:  (None, None)
I0420 20:22:43.395552 133508389783360 maxtext_utils.py:1740]  params/params/decoder/layers/self_attention/key/kernel
    Shape:     float32[2048,16,16,128]
    Logical:   PartitionSpec('embed', 'layers', 'kv_heads', 'kv_head_dim')
    Physical:  ('fsdp', None, None, None)
I0420 20:22:43.395605 133508389783360 maxtext_utils.py:1740]  params/params/decoder/layers/self_attention/out/kernel
    Shape:     float32[16,16,128,2048]
    Logical:   PartitionSpec('heads', 'layers', 'kv', 'embed')
    Physical:  (None, None, None, 'fsdp')
I0420 20:22:43.395646 133508389783360 maxtext_utils.py:1740]  params/params/decoder/layers/self_attention/query/kernel
    Shape:     float32[2048,16,16,128]
    Logical:   PartitionSpec('embed', 'layers', 'q_heads', 'kv')
    Physical:  ('fsdp', None, None, None)
I0420 20:22:43.395684 133508389783360 maxtext_utils.py:1740]  params/params/decoder/layers/self_attention/value/kernel
    Shape:     float32[2048,16,16,128]
    Logical:   PartitionSpec('embed', 'layers', 'kv_heads', 'kv_head_dim')
    Physical:  ('fsdp', None, None, None)
I0420 20:22:43.395730 133508389783360 maxtext_utils.py:1740]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   PartitionSpec('embed', 'vocab')
    Physical:  ('fsdp', None)

I0420 20:22:43.395776 133508389783360 maxtext_utils.py:1740]  params/params/token_embedder/embedding
    Shape:     float32[32000,2048]
    Logical:   PartitionSpec('vocab', 'embed')
    Physical:  (None, 'fsdp')
I0420 20:22:43.888897 133508389783360 train.py:158] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0420 20:22:43.888987 133508389783360 train.py:158] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0420 20:22:43.903824 133508389783360 train.py:165] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0420 20:22:43.903884 133508389783360 train.py:165] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0420 20:22:54.655812 133508389783360 max_utils.py:791] Total memory size: 1.5 GB, Output size: 0.4 GB, Temp size: 1.1 GB, Argument size: 0.4 GB, Host temp size: 0.0 GB.
I0420 20:22:54.662019 133508389783360 metric_logger.py:289] number parameters: 1.104 billion
I0420 20:23:06.328498 133508389783360 checkpointing.py:794] Waiting for step 10 to finish before checkpoint...
I0420 20:23:06.482215 133508389783360 checkpointing.py:798] Waited 0.15369772911071777 seconds for step 10 to finish before starting checkpointing.
I0420 20:23:06.484817 133508389783360 checkpoint_manager.py:2013] [process=0][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0420 20:23:06.486650 133508389783360 checkpoint_manager.py:1518] [process=0] Saving checkpoint at step 10
I0420 20:23:06.489387 133508389783360 async_checkpointer.py:452] [process=0] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints/10.
I0420 20:23:07.220183 133508389783360 signaling_client.py:364] Using JaxDistributedSignalingClient
I0420 20:23:07.465051 133381719308032 atomicity.py:137] Creating tmp directory gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints/10
I0420 20:23:07.500304 133508389783360 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0420 20:23:07.500402 133508389783360 replica_slices.py:424] Transferring arrays to host memory with options: use_replica_parallel=True, min_slice_bytes_for_replica_parallel=None, max_replicas_for_replica_parallel=None, enable_pinned_host_transfer=False
I0420 20:23:07.738403 133508389783360 base_pytree_checkpoint_handler.py:153] [process=0][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.239072s
I0420 20:23:07.739176 133508389783360 base_pytree_checkpoint_handler.py:129] [process=0] /jax/checkpoint/write/blocking_gbytes_per_sec: 3.017 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.5112168788909912 s) (per-host)
I0420 20:23:07.739256 133508389783360 base_pytree_checkpoint_handler.py:737] [process=0][thread=MainThread] Initiated Pytree async_save. Time taken: 0.511319s (batch_requests_ready=0.268946s, total_serialization_initiated=0.241672s, others=0.000700s)
I0420 20:23:07.739340 133508389783360 composite_checkpoint_handler.py:715] [process=0][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.515350s (all_items=0.000020s, per_item={'items': '0.00001979'}, temp_paths=0.515330)
I0420 20:23:07.740217 133382818227968 async_checkpointer.py:79] [process=0][thread=async_save] Background save thread started.
I0420 20:23:07.740376 133508389783360 async_checkpointer.py:561] Finished blocking save. Time taken: 1.253654s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints/10.
I0420 20:23:08.195957 133508389783360 checkpoint_manager.py:1566] [process=0][thread=MainThread][step=10] Starting CheckpointManager Save Finalize thread=save_finalize
I0420 20:23:08.196346 133381710915328 async_checkpointer.py:265] [process=0][thread=save_finalize] Waiting for background save thread=async_save.
I0420 20:23:08.196510 133508389783360 standard_logger.py:34] {'step': 10, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776716586.484798, 'wait_for_prev_duration_secs': 6.4849853515625e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776716586.4866898, 'checkpointer_blocking_duration_secs': 1.2537930011749268, 'get_old_steps_start_time': 1776716587.740502, 'get_old_steps_duration_secs': 2.574920654296875e-05, 'checkpoint_manager_blocking_start_time': 1776716586.4828563, 'checkpoint_manager_blocking_duration_secs': 1.713615894317627}
I0420 20:23:08.196615 133508389783360 checkpointing.py:409] Started an asynchronous checkpoint save for step 10
I0420 20:23:08.196668 133508389783360 max_utils.py:750] 
Memstats: After params initialized:
I0420 20:23:08.196727 133508389783360 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_0(process=0,(0,0,0,0))
I0420 20:23:08.196762 133508389783360 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_1(process=0,(1,0,0,0))
I0420 20:23:08.196806 133508389783360 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_4(process=0,(0,1,0,0))
I0420 20:23:08.196835 133508389783360 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_5(process=0,(1,1,0,0))
I0420 20:23:08.486167 133508389783360 metric_logger.py:185] completed step: 10, seconds: 11.298, TFLOP/s/device: 1.203, Tokens/s/device: 181.279, total_weights: 65536, loss: 6.833
I0420 20:23:08.631624 133508389783360 metric_logger.py:185] completed step: 11, seconds: 2.156, TFLOP/s/device: 6.302, Tokens/s/device: 949.874, total_weights: 65536, loss: 6.528
I0420 20:23:08.778856 133508389783360 metric_logger.py:185] completed step: 12, seconds: 0.010, TFLOP/s/device: 1409.892, Tokens/s/device: 212514.268, total_weights: 65536, loss: 6.265
I0420 20:23:08.926430 133508389783360 metric_logger.py:185] completed step: 13, seconds: 0.146, TFLOP/s/device: 93.188, Tokens/s/device: 14046.254, total_weights: 65536, loss: 6.045
I0420 20:23:08.934882 133508389783360 checkpointing.py:794] Waiting for step 15 to finish before checkpoint...
I0420 20:23:09.205189 133384923748096 atomicity.py:137] Creating tmp directory gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints/10/items
I0420 20:23:09.221282 133508389783360 checkpointing.py:798] Waited 0.2862675189971924 seconds for step 15 to finish before starting checkpointing.
I0420 20:23:09.224113 133508389783360 checkpoint_manager.py:2024] [process=0][thread=MainThread][step=10][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0420 20:23:09.804756 133382793049856 checkpoint.py:188] Wrote Metadata={'item_handlers': None, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776716588958911301, 'commit_timestamp_nsecs': None, 'custom_metadata': {}}, json={"item_handlers": null, "metrics": {}, "performance_metrics": {}, "init_timestamp_nsecs": 1776716588958911301, "commit_timestamp_nsecs": null, "custom_metadata": {}} to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints/10/_CHECKPOINT_METADATA
I0420 20:23:12.200445 133383313135360 array_metadata_store.py:203] [process=0][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints/10/items/array_metadatas/process_0
I0420 20:23:52.413831 133382826620672 base_pytree_checkpoint_handler.py:1232] [process=0][thread=write_metadata_after_commits] Commit + Array metadata written. Time taken: 42.083282s (commit=40.938421s, array_metadata_write=1.144861s)
I0420 20:23:52.415062 133382818227968 base_pytree_checkpoint_handler.py:129] [process=0] /jax/checkpoint/write/gbytes_per_sec: 34.957 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 45.18708896636963 s) (per-host)
I0420 20:23:52.415156 133382818227968 async_checkpointer.py:90] [process=0][thread=async_save] 3 Handler Commit operations completed. Time taken: 44.674824s.
I0420 20:23:53.948111 133382818227968 array_metadata_store.py:411] [process=0][thread=async_save] Validated ArrayMetadata from all 8 hosts. Time taken: 0.000409s.
I0420 20:23:53.976742 133382793049856 checkpoint.py:247] Updated Metadata={'item_handlers': {'items': 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler'}, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776716588958911301, 'commit_timestamp_nsecs': None, 'custom_metadata': {}} to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints/10/_CHECKPOINT_METADATA
I0420 20:23:54.595203 133382818227968 ocdbt_utils.py:49] Param validation support for Zarr3 will be added later (b/362328389).
I0420 20:23:55.587863 133382818227968 base_pytree_checkpoint_handler.py:1356] [process=0][thread=async_save] Pytree save finalize (merge_ocdbt + ArrayMetadata validation) completed. Time taken: 2.251893s. use_zarr3=True, enable_post_merge_validation=True, directory=gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints/10/items
I0420 20:23:55.590250 133382818227968 atomicity.py:608] Finalizing gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints/10/items
I0420 20:23:56.015188 133382818227968 atomicity.py:608] Finalizing gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints/10
I0420 20:23:58.088278 133382818227968 atomicity.py:790] [process=0][thread=async_save] Finished saving checkpoint (finalized tmp dir) to `gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints/10`.
I0420 20:23:58.089406 133382818227968 async_checkpointer.py:420] Finished async_save (blocking + background). Time taken: 51.602684s. directory=gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints/10
I0420 20:23:58.090742 133382818227968 async_checkpointer.py:144] [process=0][thread=async_save] Background save thread done. Time taken: 50.350407s.
I0420 20:23:58.091093 133381710915328 async_checkpointer.py:273] [process=0][thread=save_finalize] Done with waiting for background save thread=async_save.
I0420 20:23:58.091270 133381710915328 async_checkpointer.py:283] [process=0][thread=save_finalize] No errors found in background save thread=async_save.
I0420 20:23:58.091421 133381710915328 checkpoint_manager.py:2133] [process=0][thread=save_finalize][step=10] CheckpointManager Save Finalize is syncing with other hosts...
I0420 20:23:58.093065 133381710915328 checkpoint_manager.py:2142] [process=0][thread=save_finalize][step=10] CheckpointManager Save Finalize is done on all hosts.
I0420 20:23:58.093402 133508389783360 checkpoint_manager.py:2036] [process=0][thread=MainThread][step=10][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=10.
W0420 20:23:58.093575 133508389783360 checkpoint_manager.py:1458] Waiting for previous save to complete took 48.869469 seconds. If this number is high, consider checkpointing less frequently.
I0420 20:23:58.095455 133508389783360 checkpoint_manager.py:1518] [process=0] Saving checkpoint at step 15
I0420 20:23:58.099474 133508389783360 async_checkpointer.py:452] [process=0] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints/15.
I0420 20:23:58.652531 133382818227968 atomicity.py:137] Creating tmp directory gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints/15
I0420 20:23:58.674369 133508389783360 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0420 20:23:58.674511 133508389783360 replica_slices.py:424] Transferring arrays to host memory with options: use_replica_parallel=True, min_slice_bytes_for_replica_parallel=None, max_replicas_for_replica_parallel=None, enable_pinned_host_transfer=False
I0420 20:23:58.721856 133508389783360 base_pytree_checkpoint_handler.py:153] [process=0][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.048700s
I0420 20:23:58.722713 133508389783360 base_pytree_checkpoint_handler.py:129] [process=0] /jax/checkpoint/write/blocking_gbytes_per_sec: 4.914 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.31392598152160645 s) (per-host)
I0420 20:23:58.722833 133508389783360 base_pytree_checkpoint_handler.py:737] [process=0][thread=MainThread] Initiated Pytree async_save. Time taken: 0.314070s (batch_requests_ready=0.260495s, total_serialization_initiated=0.052807s, others=0.000768s)
I0420 20:23:58.722961 133508389783360 composite_checkpoint_handler.py:715] [process=0][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.318666s (all_items=0.000023s, per_item={'items': '0.00002289'}, temp_paths=0.318643)
I0420 20:23:58.724141 133381710915328 async_checkpointer.py:79] [process=0][thread=async_save] Background save thread started.
I0420 20:23:58.724342 133508389783360 async_checkpointer.py:561] Finished blocking save. Time taken: 0.628783s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints/15.
I0420 20:23:58.730282 133508389783360 checkpoint_manager.py:1566] [process=0][thread=MainThread][step=15] Starting CheckpointManager Save Finalize thread=save_finalize
I0420 20:23:58.730676 133382784657152 async_checkpointer.py:265] [process=0][thread=save_finalize] Waiting for background save thread=async_save.
I0420 20:23:58.730925 133508389783360 standard_logger.py:34] {'step': 15, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776716589.2240713, 'wait_for_prev_duration_secs': 48.86946892738342, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776716638.0955203, 'checkpointer_blocking_duration_secs': 0.6289761066436768, 'get_old_steps_start_time': 1776716638.7245219, 'get_old_steps_duration_secs': 3.910064697265625e-05, 'checkpoint_manager_blocking_start_time': 1776716589.2219257, 'checkpoint_manager_blocking_duration_secs': 49.50894618034363}
I0420 20:23:58.731075 133508389783360 checkpointing.py:409] Started an asynchronous checkpoint save for step 15
I0420 20:24:16.323321 133508389783360 metric_logger.py:185] completed step: 14, seconds: 0.147, TFLOP/s/device: 92.305, Tokens/s/device: 13913.233, total_weights: 65536, loss: 5.864
I0420 20:24:16.332160 133508389783360 metric_logger.py:185] completed step: 15, seconds: 0.148, TFLOP/s/device: 92.089, Tokens/s/device: 13880.605, total_weights: 65536, loss: 5.719
I0420 20:24:16.477901 133508389783360 metric_logger.py:185] completed step: 16, seconds: 67.396, TFLOP/s/device: 0.202, Tokens/s/device: 30.388, total_weights: 65536, loss: 5.605
I0420 20:24:16.625320 133508389783360 metric_logger.py:185] completed step: 17, seconds: 0.007, TFLOP/s/device: 1961.191, Tokens/s/device: 295612.009, total_weights: 65536, loss: 5.517
I0420 20:24:16.772818 133508389783360 metric_logger.py:185] completed step: 18, seconds: 0.147, TFLOP/s/device: 92.689, Tokens/s/device: 13971.035, total_weights: 65536, loss: 5.448
I0420 20:24:16.919950 133508389783360 checkpointing.py:794] Waiting for step 19 to finish before checkpoint...
I0420 20:24:16.920561 133508389783360 checkpointing.py:798] Waited 0.0006310939788818359 seconds for step 19 to finish before starting checkpointing.
I0420 20:24:16.922661 133508389783360 checkpoint_manager.py:2024] [process=0][thread=MainThread][step=15][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0420 20:24:17.855433 133382231877376 atomicity.py:137] Creating tmp directory gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints/15/items
I0420 20:24:20.683689 133383313135360 array_metadata_store.py:203] [process=0][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints/15/items/array_metadatas/process_0
I0420 20:25:00.185248 133382826620672 base_pytree_checkpoint_handler.py:1232] [process=0][thread=write_metadata_after_commits] Commit + Array metadata written. Time taken: 41.174057s (commit=40.094720s, array_metadata_write=1.079337s)
I0420 20:25:00.186376 133381710915328 base_pytree_checkpoint_handler.py:129] [process=0] /jax/checkpoint/write/gbytes_per_sec: 25.569 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 61.777570962905884 s) (per-host)
I0420 20:25:00.186493 133381710915328 async_checkpointer.py:90] [process=0][thread=async_save] 3 Handler Commit operations completed. Time taken: 61.462208s.
I0420 20:25:01.724564 133381710915328 array_metadata_store.py:411] [process=0][thread=async_save] Validated ArrayMetadata from all 8 hosts. Time taken: 0.000245s.
I0420 20:25:02.047669 133381710915328 ocdbt_utils.py:49] Param validation support for Zarr3 will be added later (b/362328389).
I0420 20:25:02.707438 133381710915328 base_pytree_checkpoint_handler.py:1356] [process=0][thread=async_save] Pytree save finalize (merge_ocdbt + ArrayMetadata validation) completed. Time taken: 1.586613s. use_zarr3=True, enable_post_merge_validation=True, directory=gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints/15/items
I0420 20:25:02.709378 133381710915328 atomicity.py:608] Finalizing gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints/15/items
I0420 20:25:03.154690 133381710915328 atomicity.py:608] Finalizing gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints/15
I0420 20:25:04.640132 133381710915328 atomicity.py:790] [process=0][thread=async_save] Finished saving checkpoint (finalized tmp dir) to `gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints/15`.
I0420 20:25:04.640996 133381710915328 async_checkpointer.py:420] Finished async_save (blocking + background). Time taken: 66.545449s. directory=gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints/15
I0420 20:25:04.642396 133381710915328 async_checkpointer.py:144] [process=0][thread=async_save] Background save thread done. Time taken: 65.918110s.
I0420 20:25:04.642562 133382784657152 async_checkpointer.py:273] [process=0][thread=save_finalize] Done with waiting for background save thread=async_save.
I0420 20:25:04.642654 133382784657152 async_checkpointer.py:283] [process=0][thread=save_finalize] No errors found in background save thread=async_save.
I0420 20:25:04.642730 133382784657152 checkpoint_manager.py:2133] [process=0][thread=save_finalize][step=15] CheckpointManager Save Finalize is syncing with other hosts...
I0420 20:25:04.644688 133382784657152 checkpoint_manager.py:2142] [process=0][thread=save_finalize][step=15] CheckpointManager Save Finalize is done on all hosts.
I0420 20:25:04.644871 133508389783360 checkpoint_manager.py:2036] [process=0][thread=MainThread][step=15][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=15.
W0420 20:25:04.644997 133508389783360 checkpoint_manager.py:1458] Waiting for previous save to complete took 47.722352 seconds. If this number is high, consider checkpointing less frequently.
I0420 20:25:04.646477 133508389783360 checkpoint_manager.py:1518] [process=0] Saving checkpoint at step 19
I0420 20:25:04.649988 133508389783360 async_checkpointer.py:452] [process=0] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints/19.
I0420 20:25:05.194516 133381710915328 atomicity.py:137] Creating tmp directory gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints/19
I0420 20:25:05.195239 133508389783360 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0420 20:25:05.195339 133508389783360 replica_slices.py:424] Transferring arrays to host memory with options: use_replica_parallel=True, min_slice_bytes_for_replica_parallel=None, max_replicas_for_replica_parallel=None, enable_pinned_host_transfer=False
I0420 20:25:05.221377 133508389783360 base_pytree_checkpoint_handler.py:153] [process=0][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.027771s
I0420 20:25:05.222123 133508389783360 base_pytree_checkpoint_handler.py:129] [process=0] /jax/checkpoint/write/blocking_gbytes_per_sec: 5.461 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.28249382972717285 s) (per-host)
I0420 20:25:05.222186 133508389783360 base_pytree_checkpoint_handler.py:737] [process=0][thread=MainThread] Initiated Pytree async_save. Time taken: 0.282573s (batch_requests_ready=0.251957s, total_serialization_initiated=0.029927s, others=0.000689s)
I0420 20:25:05.222259 133508389783360 composite_checkpoint_handler.py:715] [process=0][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.286396s (all_items=0.000017s, per_item={'items': '0.00001717'}, temp_paths=0.286379)
I0420 20:25:05.223066 133382826620672 async_checkpointer.py:79] [process=0][thread=async_save] Background save thread started.
I0420 20:25:05.223228 133508389783360 async_checkpointer.py:561] Finished blocking save. Time taken: 0.576681s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints/19.
I0420 20:25:05.269384 133508389783360 checkpoint_manager.py:1566] [process=0][thread=MainThread][step=19] Starting CheckpointManager Save Finalize thread=save_finalize
I0420 20:25:05.269697 133382784657152 async_checkpointer.py:265] [process=0][thread=save_finalize] Waiting for background save thread=async_save.
I0420 20:25:05.269858 133508389783360 standard_logger.py:34] {'step': 19, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776716656.9226284, 'wait_for_prev_duration_secs': 47.72235155105591, 'time_between_consecutive_saves_sec': 18.829495668411255, 'checkpointer_blocking_start_time': 1776716704.646518, 'checkpointer_blocking_duration_secs': 0.5768218040466309, 'get_old_steps_start_time': 1776716705.2233567, 'get_old_steps_duration_secs': 2.6941299438476562e-05, 'checkpoint_manager_blocking_start_time': 1776716656.9208033, 'checkpoint_manager_blocking_duration_secs': 48.349021673202515}
I0420 20:25:05.270008 133508389783360 checkpointing.py:409] Started an asynchronous checkpoint save for step 19
I0420 20:25:05.270052 133508389783360 checkpoint_manager.py:2024] [process=0][thread=MainThread][step=19][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0420 20:25:07.028836 133383313135360 atomicity.py:137] Creating tmp directory gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints/19/items
I0420 20:25:10.247505 133385485797120 array_metadata_store.py:203] [process=0][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints/19/items/array_metadatas/process_0
I0420 20:25:49.457031 133383321528064 base_pytree_checkpoint_handler.py:1232] [process=0][thread=write_metadata_after_commits] Commit + Array metadata written. Time taken: 41.306380s (commit=40.195678s, array_metadata_write=1.110701s)
I0420 20:25:49.458189 133382826620672 base_pytree_checkpoint_handler.py:129] [process=0] /jax/checkpoint/write/gbytes_per_sec: 35.482 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 44.51853156089783 s) (per-host)
I0420 20:25:49.458302 133382826620672 async_checkpointer.py:90] [process=0][thread=async_save] 3 Handler Commit operations completed. Time taken: 44.235114s.
I0420 20:25:51.246321 133382826620672 array_metadata_store.py:411] [process=0][thread=async_save] Validated ArrayMetadata from all 8 hosts. Time taken: 0.000218s.
I0420 20:25:51.327293 133382826620672 ocdbt_utils.py:49] Param validation support for Zarr3 will be added later (b/362328389).
I0420 20:25:52.074548 133382826620672 base_pytree_checkpoint_handler.py:1356] [process=0][thread=async_save] Pytree save finalize (merge_ocdbt + ArrayMetadata validation) completed. Time taken: 1.679968s. use_zarr3=True, enable_post_merge_validation=True, directory=gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints/19/items
I0420 20:25:52.077180 133382826620672 atomicity.py:608] Finalizing gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints/19/items
I0420 20:25:52.529156 133382826620672 atomicity.py:608] Finalizing gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints/19
I0420 20:25:53.871891 133382826620672 atomicity.py:790] [process=0][thread=async_save] Finished saving checkpoint (finalized tmp dir) to `gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints/19`.
I0420 20:25:53.872691 133382826620672 async_checkpointer.py:420] Finished async_save (blocking + background). Time taken: 49.226148s. directory=gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_true/checkpoints/19
I0420 20:25:53.875061 133382826620672 async_checkpointer.py:144] [process=0][thread=async_save] Background save thread done. Time taken: 48.651871s.
I0420 20:25:53.875266 133382784657152 async_checkpointer.py:273] [process=0][thread=save_finalize] Done with waiting for background save thread=async_save.
I0420 20:25:53.875377 133382784657152 async_checkpointer.py:283] [process=0][thread=save_finalize] No errors found in background save thread=async_save.
I0420 20:25:53.875432 133382784657152 checkpoint_manager.py:2133] [process=0][thread=save_finalize][step=19] CheckpointManager Save Finalize is syncing with other hosts...
I0420 20:25:53.877372 133382784657152 checkpoint_manager.py:2142] [process=0][thread=save_finalize][step=19] CheckpointManager Save Finalize is done on all hosts.
I0420 20:25:53.877571 133508389783360 checkpoint_manager.py:2036] [process=0][thread=MainThread][step=19][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=19.
I0420 20:25:53.877657 133508389783360 checkpoint_manager.py:2013] [process=0][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0420 20:25:53.878287 133508389783360 metric_logger.py:185] completed step: 19, seconds: 0.148, TFLOP/s/device: 91.863, Tokens/s/device: 13846.539, total_weights: 65536, loss: 5.391
Per train step:
 Total TFLOPs: 13.59 
 split as 93.93% learnable weight flops and 6.07% attention flops
XPK End: Mon Apr 20 20:26:07 UTC 2026
EXIT_CODE=0