XPK Start: Sun Apr 19 19:19:25 UTC 2026
PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used.
2026-04-19 19:19:50.254624: 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)
I0419 19:19:50.435716 138194759948096 max_utils.py:273] Attempting to initialize the jax distributed system...
I0419 19:19:59.475483 138194759948096 distributed.py:149] Starting JAX distributed service on [::]:8482
I0419 19:19:59.477753 138194759948096 distributed.py:172] Connecting to JAX distributed service on mt-15-ocdbt-true-rs-5weou-slice-job-0-0.mt-15-ocdbt-true-rs-5weou:8482
I0419 19:20:01.260295 138194759948096 max_utils.py:284] Jax distributed system initialized!
I0419 19:20:07.623260 138194759948096 max_utils.py:800] System Information: Jax Version: 0.9.2
I0419 19:20:07.623362 138194759948096 max_utils.py:801] System Information: Jaxlib Version: 0.9.2
I0419 19:20:07.623400 138194759948096 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
I0419 19:20:07.623461 138194759948096 train_utils.py:348] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0419 19:20:08.323314 138194759948096 maxtext_utils.py:1551] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0419 19:20:08.323613 138194759948096 checkpointing.py:677] Setting up checkpoint logger...
I0419 19:20:08.323669 138194759948096 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True
I0419 19:20:08.323714 138194759948096 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None
I0419 19:20:08.324044 138194759948096 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 0x7daf4502a600>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0419 19:20:10.081767 138194759948096 checkpointing.py:265] Enabling policy for fixed interval checkpointing.
I0419 19:20:10.081993 138194759948096 checkpoint_manager.py:708] [process=6][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7d9b5c1ae1b0>}, handler_registry=None
I0419 19:20:10.082232 138194759948096 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7d9b5c1ae1b0>` 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`.
I0419 19:20:10.082281 138194759948096 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7dae35f51040>` 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`.
I0419 19:20:10.082314 138194759948096 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 0x7d9b5c1ae1b0>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7d9b5c1ae1b0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7dae35f51040>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7dae35f51040>}).
I0419 19:20:10.082644 138194759948096 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34
I0419 19:20:10.082712 138194759948096 async_checkpointer.py:192] [process=6][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7d9b0c7d7d80> timeout: 1200 secs and primary_host=0 for async checkpoint writes
I0419 19:20:12.818004 138073375491840 checkpoint.py:228] Read Metadata={'item_handlers': {'items': 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler'}, 'metrics': {}, 'performance_metrics': {}, 'init_timestamp_nsecs': 1776626190065702773, 'commit_timestamp_nsecs': 1776626237735438306, 'custom_metadata': {}} from gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_15_ocdbt_true/checkpoints/5/_CHECKPOINT_METADATA
I0419 19:20:13.058701 138073375491840 checkpoint_manager.py:1871] Missing metrics for step 5
I0419 19:20:14.237012 138194759948096 checkpoint_manager.py:1812] Found 3 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_15_ocdbt_true/checkpoints
I0419 19:20:14.240011 138194759948096 checkpoint_manager.py:929] [process=6][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_20260419_180002/linen_xpk_main_20260419_180002_15_ocdbt_true/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7d9b24463b60>
I0419 19:20:14.240124 138194759948096 checkpointing.py:301] Checkpoint manager created!
I0419 19:20:15.164212 138194759948096 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0419 19:20:15.164326 138194759948096 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0419 19:20:15.543900 138194759948096 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0419 19:20:15.543995 138194759948096 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0419 19:20:15.560274 138194759948096 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0419 19:20:15.560332 138194759948096 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0419 19:20:15.584466 138194759948096 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0419 19:20:15.584534 138194759948096 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0419 19:20:15.600921 138194759948096 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0419 19:20:15.600983 138194759948096 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0419 19:20:15.617376 138194759948096 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0419 19:20:15.617451 138194759948096 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0419 19:20:15.642887 138194759948096 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0419 19:20:15.642966 138194759948096 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0419 19:20:15.664252 138194759948096 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0419 19:20:15.664315 138194759948096 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0419 19:20:15.885385 138194759948096 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint
I0419 19:20:15.885507 138194759948096 checkpointing.py:581] restoring from this run's directory step 9
I0419 19:20:16.559351 138194759948096 event_tracking.py:70] [process=6] [sync] Started load checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_15_ocdbt_true/checkpoints/9.
I0419 19:20:17.240718 138194759948096 checkpointer.py:307] Restoring checkpoint from gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_15_ocdbt_true/checkpoints/9.
I0419 19:20:17.241148 138194759948096 event_tracking.py:125] [process=6] [sync] Finished blocking load in 0.68 seconds. Continuing load @ gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_15_ocdbt_true/checkpoints/9.
I0419 19:20:19.957997 1450 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0419 19:20:26.541890 138194759948096 jax_array_handlers.py:843] [process=6] /jax/orbax/read/worker/io/requested throughput: 239.806 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 6.589792490005493 s) (per-host)
I0419 19:20:26.547265 138194759948096 base_pytree_checkpoint_handler.py:130] [process=6] /jax/checkpoint/read/gbytes_per_sec: 213.154 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 7.424658536911011 s) (per-host)
I0419 19:20:26.549494 138194759948096 event_tracking.py:138] [process=6] [sync] Finished load in 9.99 seconds @ gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_15_ocdbt_true/checkpoints/9
I0419 19:20:26.549588 138194759948096 standard_logger.py:34] {'step': 9, 'event_type': 'restore', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_15_ocdbt_true/checkpoints', 'checkpointer_start_time': 1776626416.5592508, 'checkpointer_duration_secs': 9.99030876159668, 'checkpoint_manager_start_time': 1776626415.8857484, 'checkpoint_manager_duration_secs': 10.663813829421997}
fsdp: 32
I0419 19:20:26.966818 138194759948096 maxtext_utils.py:1654] params/params/decoder/decoder_norm/scale
Shape: float32[2048]
Logical: P('norm',)
Physical: (None,)
I0419 19:20:26.966944 138194759948096 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)
I0419 19:20:26.966997 138194759948096 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)
I0419 19:20:26.967054 138194759948096 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')
I0419 19:20:26.967103 138194759948096 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)
I0419 19:20:26.967141 138194759948096 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)
I0419 19:20:26.967192 138194759948096 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)
I0419 19:20:26.967244 138194759948096 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')
I0419 19:20:26.967284 138194759948096 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)
I0419 19:20:26.967320 138194759948096 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)
I0419 19:20:26.967367 138194759948096 maxtext_utils.py:1654] params/params/decoder/logits_dense/kernel
Shape: float32[2048,32000]
Logical: P('embed_vocab', 'vocab')
Physical: ('fsdp', None)
I0419 19:20:26.967427 138194759948096 maxtext_utils.py:1654] params/params/token_embedder/embedding
Shape: float32[32000,2048]
Logical: P('vocab', 'embed_vocab')
Physical: (None, 'fsdp')
I0419 19:20:27.459038 138194759948096 train.py:155] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0419 19:20:27.459134 138194759948096 train.py:155] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0419 19:20:27.474333 138194759948096 train.py:162] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0419 19:20:27.474392 138194759948096 train.py:162] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0419 19:20:38.539206 138194759948096 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.
I0419 19:20:38.540075 138194759948096 metric_logger.py:301] number parameters: 1.104 billion
I0419 19:20:49.583958 138194759948096 checkpointing.py:772] Waiting for step 10 to finish before checkpoint...
I0419 19:20:49.929710 138194759948096 checkpointing.py:776] Waited 0.34572839736938477 seconds for step 10 to finish before starting checkpointing.
I0419 19:20:49.932481 138194759948096 checkpoint_manager.py:2009] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0419 19:20:49.934565 138194759948096 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 10
I0419 19:20:49.935998 138194759948096 event_tracking.py:70] [process=6] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_15_ocdbt_true/checkpoints/10.
I0419 19:20:50.681171 138194759948096 signaling_client.py:364] Using JaxDistributedSignalingClient
I0419 19:20:50.682123 138194759948096 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0419 19:20:50.682181 138194759948096 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
I0419 19:20:50.956310 138194759948096 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.275214s
I0419 19:20:50.956491 138194759948096 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 5.529 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.27901792526245117 s) (per-host)
I0419 19:20:50.956542 138194759948096 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.279081s (batch_requests_ready=0.002111s, total_serialization_initiated=0.276899s, others=0.000071s)
I0419 19:20:50.956610 138194759948096 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.283438s (all_items=0.000025s, per_item={'items': '0.00002456'}, temp_paths=0.283413)
I0419 19:20:50.957282 138194759948096 event_tracking.py:125] [process=6] [async] Finished blocking save in 1.02 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_15_ocdbt_true/checkpoints/10.
I0419 19:20:50.957563 138073358706432 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-19 19:40:50.957540
I0419 19:20:50.969464 138194759948096 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=10] Starting CheckpointManager Save Finalize thread=save_finalize
I0419 19:20:50.969780 138069416068864 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save.
I0419 19:20:50.969933 138194759948096 standard_logger.py:34] {'step': 10, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_15_ocdbt_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776626449.9324632, 'wait_for_prev_duration_secs': 5.793571472167969e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776626449.9346037, 'checkpointer_blocking_duration_secs': 1.0230674743652344, 'get_old_steps_start_time': 1776626450.9576936, 'get_old_steps_duration_secs': 3.266334533691406e-05, 'checkpoint_manager_blocking_start_time': 1776626449.9302382, 'checkpoint_manager_blocking_duration_secs': 1.039658546447754}
I0419 19:20:50.970043 138194759948096 checkpointing.py:408] Started an asynchronous checkpoint save for step 10
I0419 19:20:50.970094 138194759948096 max_utils.py:750]
Memstats: After params initialized:
I0419 19:20:50.970143 138194759948096 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_24(process=6,(0,6,0,0))
I0419 19:20:50.970180 138194759948096 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_25(process=6,(1,6,0,0))
I0419 19:20:50.970207 138194759948096 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_28(process=6,(0,7,0,0))
I0419 19:20:50.970239 138194759948096 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_29(process=6,(1,7,0,0))
I0419 19:20:51.279476 138194759948096 metric_logger.py:196] completed step: 10, seconds: 11.044, TFLOP/s/device: 1.230, Tokens/s/device: 185.444, total_weights: 65536, loss: 6.833, lm_loss: 6.833, perplexity: 927.869
I0419 19:20:51.446002 138194759948096 metric_logger.py:196] completed step: 11, seconds: 1.694, TFLOP/s/device: 8.021, Tokens/s/device: 1209.035, total_weights: 65536, loss: 6.527, lm_loss: 6.527, perplexity: 683.659
I0419 19:20:51.593208 138194759948096 metric_logger.py:196] completed step: 12, seconds: 0.019, TFLOP/s/device: 700.873, Tokens/s/device: 105643.248, total_weights: 65536, loss: 6.265, lm_loss: 6.265, perplexity: 526.068
I0419 19:20:51.740629 138194759948096 metric_logger.py:196] completed step: 13, seconds: 0.153, TFLOP/s/device: 88.684, Tokens/s/device: 13367.361, total_weights: 65536, loss: 6.045, lm_loss: 6.045, perplexity: 422.001
I0419 19:20:51.745113 138194759948096 checkpointing.py:772] Waiting for step 15 to finish before checkpoint...
I0419 19:20:52.034811 138194759948096 checkpointing.py:776] Waited 0.2896609306335449 seconds for step 15 to finish before starting checkpointing.
I0419 19:20:52.037767 138194759948096 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=10][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0419 19:20:57.116137 138069424461568 array_metadata_store.py:203] [process=6][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_15_ocdbt_true/checkpoints/10/items/array_metadatas/process_6
I0419 19:21:33.611106 138073358706432 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 36.792 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.93359661102295 s) (per-host)
I0419 19:21:33.611243 138073358706432 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.653605s.
I0419 19:21:44.071218 138073358706432 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 53.113561s.
I0419 19:21:44.071528 138069416068864 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save.
I0419 19:21:44.071654 138069416068864 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save.
I0419 19:21:44.071703 138069416068864 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=10] CheckpointManager Save Finalize is syncing with other hosts...
I0419 19:21:44.073292 138069416068864 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=10] CheckpointManager Save Finalize is done on all hosts.
I0419 19:21:44.073497 138194759948096 checkpoint_manager.py:2032] [process=6][thread=MainThread][step=10][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=10.
W0419 19:21:44.073628 138194759948096 checkpoint_manager.py:1452] Waiting for previous save to complete took 52.035861 seconds. If this number is high, consider checkpointing less frequently.
I0419 19:21:44.075603 138194759948096 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 15
I0419 19:21:44.078101 138194759948096 event_tracking.py:70] [process=6] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_15_ocdbt_true/checkpoints/15.
I0419 19:21:44.381663 138194759948096 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0419 19:21:44.381758 138194759948096 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
I0419 19:21:44.407717 138194759948096 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.027189s
I0419 19:21:44.407884 138194759948096 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 50.386 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.03061509132385254 s) (per-host)
I0419 19:21:44.407937 138194759948096 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.030677s (batch_requests_ready=0.001746s, total_serialization_initiated=0.028862s, others=0.000069s)
I0419 19:21:44.408033 138194759948096 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.035547s (all_items=0.000012s, per_item={'items': '0.00001240'}, temp_paths=0.035535)
I0419 19:21:44.408645 138194759948096 event_tracking.py:125] [process=6] [async] Finished blocking save in 0.33 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_15_ocdbt_true/checkpoints/15.
I0419 19:21:44.408941 138066203236096 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-19 19:41:44.408904
I0419 19:21:44.417916 138194759948096 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=15] Starting CheckpointManager Save Finalize thread=save_finalize
I0419 19:21:44.418200 138069416068864 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save.
I0419 19:21:44.418359 138194759948096 standard_logger.py:34] {'step': 15, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_15_ocdbt_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776626452.0377371, 'wait_for_prev_duration_secs': 52.035861015319824, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776626504.0756416, 'checkpointer_blocking_duration_secs': 0.33343935012817383, 'get_old_steps_start_time': 1776626504.409103, 'get_old_steps_duration_secs': 2.8371810913085938e-05, 'checkpoint_manager_blocking_start_time': 1776626452.0354567, 'checkpoint_manager_blocking_duration_secs': 52.38287019729614}
I0419 19:21:44.418485 138194759948096 checkpointing.py:408] Started an asynchronous checkpoint save for step 15
I0419 19:21:44.419189 138194759948096 metric_logger.py:196] completed step: 14, seconds: 0.147, TFLOP/s/device: 92.298, Tokens/s/device: 13912.098, total_weights: 65536, loss: 5.864, lm_loss: 5.864, perplexity: 352.193
I0419 19:21:44.425635 138194759948096 metric_logger.py:196] completed step: 15, seconds: 0.147, TFLOP/s/device: 92.217, Tokens/s/device: 13900.012, total_weights: 65536, loss: 5.719, lm_loss: 5.719, perplexity: 304.661
I0419 19:21:50.383268 138069424461568 array_metadata_store.py:203] [process=6][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_15_ocdbt_true/checkpoints/15/items/array_metadatas/process_6
I0419 19:22:06.101602 138194759948096 metric_logger.py:196] completed step: 16, seconds: 52.679, TFLOP/s/device: 0.258, Tokens/s/device: 38.877, total_weights: 65536, loss: 5.605, lm_loss: 5.605, perplexity: 271.872
I0419 19:22:06.248978 138194759948096 metric_logger.py:196] completed step: 17, seconds: 21.530, TFLOP/s/device: 0.631, Tokens/s/device: 95.123, total_weights: 65536, loss: 5.517, lm_loss: 5.517, perplexity: 248.975
I0419 19:22:06.396313 138194759948096 metric_logger.py:196] completed step: 18, seconds: 0.152, TFLOP/s/device: 89.270, Tokens/s/device: 13455.714, total_weights: 65536, loss: 5.448, lm_loss: 5.448, perplexity: 232.333
I0419 19:22:06.543010 138194759948096 checkpointing.py:772] Waiting for step 19 to finish before checkpoint...
I0419 19:22:06.543751 138194759948096 checkpointing.py:776] Waited 0.000759124755859375 seconds for step 19 to finish before starting checkpointing.
I0419 19:22:06.545872 138194759948096 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=15][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0419 19:22:27.026665 138066203236096 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 37.037 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.64935564994812 s) (per-host)
I0419 19:22:27.026790 138066203236096 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.617737s.
I0419 19:22:36.505508 138066203236096 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 52.096440s.
I0419 19:22:36.505811 138069416068864 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save.
I0419 19:22:36.505928 138069416068864 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save.
I0419 19:22:36.505976 138069416068864 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=15] CheckpointManager Save Finalize is syncing with other hosts...
I0419 19:22:36.511740 138069416068864 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=15] CheckpointManager Save Finalize is done on all hosts.
I0419 19:22:36.511924 138194759948096 checkpoint_manager.py:2032] [process=6][thread=MainThread][step=15][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=15.
W0419 19:22:36.512059 138194759948096 checkpoint_manager.py:1452] Waiting for previous save to complete took 29.966193 seconds. If this number is high, consider checkpointing less frequently.
I0419 19:22:36.513593 138194759948096 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 19
I0419 19:22:36.515647 138194759948096 event_tracking.py:70] [process=6] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_15_ocdbt_true/checkpoints/19.
I0419 19:22:36.807429 138194759948096 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0419 19:22:36.807525 138194759948096 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
I0419 19:22:36.832578 138194759948096 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.026117s
I0419 19:22:36.832729 138194759948096 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 52.222 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.029538631439208984 s) (per-host)
I0419 19:22:36.832777 138194759948096 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.029596s (batch_requests_ready=0.001642s, total_serialization_initiated=0.027892s, others=0.000062s)
I0419 19:22:36.832859 138194759948096 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.033643s (all_items=0.000010s, per_item={'items': '0.00001049'}, temp_paths=0.033633)
I0419 19:22:36.833566 138194759948096 event_tracking.py:125] [process=6] [async] Finished blocking save in 0.32 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_15_ocdbt_true/checkpoints/19.
I0419 19:22:36.833898 138069416068864 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-19 19:42:36.833861
I0419 19:22:37.253504 138194759948096 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=19] Starting CheckpointManager Save Finalize thread=save_finalize
I0419 19:22:37.253863 138073358706432 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save.
I0419 19:22:37.254027 138194759948096 standard_logger.py:34] {'step': 19, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_15_ocdbt_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776626526.545843, 'wait_for_prev_duration_secs': 29.966192960739136, 'time_between_consecutive_saves_sec': 22.4725124835968, 'checkpointer_blocking_start_time': 1776626556.5136356, 'checkpointer_blocking_duration_secs': 0.32041144371032715, 'get_old_steps_start_time': 1776626556.834065, 'get_old_steps_duration_secs': 2.47955322265625e-05, 'checkpoint_manager_blocking_start_time': 1776626526.5439928, 'checkpoint_manager_blocking_duration_secs': 30.71000051498413}
I0419 19:22:37.254144 138194759948096 checkpointing.py:408] Started an asynchronous checkpoint save for step 19
I0419 19:22:37.254189 138194759948096 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=19][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0419 19:22:43.523998 138069424461568 array_metadata_store.py:203] [process=6][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_15_ocdbt_true/checkpoints/19/items/array_metadatas/process_6
I0419 19:23:20.337572 138069416068864 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 36.284 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 43.534340143203735 s) (per-host)
I0419 19:23:20.337694 138069416068864 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 43.503682s.
I0419 19:23:27.180236 138069416068864 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 50.346208s.
I0419 19:23:27.180500 138073358706432 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save.
I0419 19:23:27.180557 138073358706432 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save.
I0419 19:23:27.180595 138073358706432 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=19] CheckpointManager Save Finalize is syncing with other hosts...
I0419 19:23:27.183292 138073358706432 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=19] CheckpointManager Save Finalize is done on all hosts.
I0419 19:23:27.183482 138194759948096 checkpoint_manager.py:2032] [process=6][thread=MainThread][step=19][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=19.
I0419 19:23:27.183633 138194759948096 checkpoint_manager.py:2009] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0419 19:23:27.184586 138194759948096 metric_logger.py:196] completed step: 19, seconds: 0.147, TFLOP/s/device: 92.176, Tokens/s/device: 13893.788, 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: Sun Apr 19 19:23:35 UTC 2026
EXIT_CODE=0