XPK Start: Sun Apr 19 18:52:00 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 18:52:24.232360: 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 18:52:24.770549 132505747203904 max_utils.py:273] Attempting to initialize the jax distributed system...
I0419 18:52:33.811394 132505747203904 distributed.py:149] Starting JAX distributed service on [::]:8482
I0419 18:52:33.813762 132505747203904 distributed.py:172] Connecting to JAX distributed service on mt-11-optimizer-offload-57e22-slice-job-0-0.mt-11-optimizer-offload-57e22:8482
I0419 18:52:35.208580 132505747203904 max_utils.py:284] Jax distributed system initialized!
I0419 18:52:41.259694 132505747203904 max_utils.py:800] System Information: Jax Version: 0.9.2
I0419 18:52:41.259798 132505747203904 max_utils.py:801] System Information: Jaxlib Version: 0.9.2
I0419 18:52:41.259839 132505747203904 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 18:52:41.259875 132505747203904 train_utils.py:348] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0419 18:52:41.956873 132505747203904 maxtext_utils.py:1551] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0419 18:52:41.957153 132505747203904 checkpointing.py:677] Setting up checkpoint logger...
I0419 18:52:41.957208 132505747203904 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True
I0419 18:52:41.957257 132505747203904 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None
I0419 18:52:41.957610 132505747203904 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 0x7882e154a6c0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0419 18:52:44.780451 132505747203904 checkpointing.py:265] Enabling policy for fixed interval checkpointing.
I0419 18:52:44.780706 132505747203904 checkpoint_manager.py:708] [process=2][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x786e6031ba70>}, handler_registry=None
I0419 18:52:44.780944 132505747203904 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x786e6031ba70>` 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 18:52:44.780992 132505747203904 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x786e6031d910>` 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 18:52:44.781028 132505747203904 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 0x786e6031ba70>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x786e6031ba70>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x786e6031d910>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x786e6031d910>}).
I0419 18:52:44.781344 132505747203904 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34
I0419 18:52:44.781415 132505747203904 async_checkpointer.py:192] [process=2][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x786d6868b4c0> timeout: 1200 secs and primary_host=0 for async checkpoint writes
I0419 18:52:46.043616 132505747203904 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_11_optimizer_offload_false/checkpoints
I0419 18:52:46.481475 132505747203904 checkpoint_manager.py:929] [process=2][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=10), 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_11_optimizer_offload_false/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x786e6031ec90>
I0419 18:52:46.481665 132505747203904 checkpointing.py:301] Checkpoint manager created!
I0419 18:52:47.405448 132505747203904 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0419 18:52:47.405574 132505747203904 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0419 18:52:47.786346 132505747203904 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0419 18:52:47.786440 132505747203904 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0419 18:52:47.802665 132505747203904 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0419 18:52:47.802731 132505747203904 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0419 18:52:47.826326 132505747203904 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 18:52:47.826394 132505747203904 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0419 18:52:47.842571 132505747203904 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 18:52:47.842626 132505747203904 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0419 18:52:47.858835 132505747203904 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 18:52:47.858896 132505747203904 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0419 18:52:47.884335 132505747203904 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0419 18:52:47.884406 132505747203904 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0419 18:52:47.905286 132505747203904 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0419 18:52:47.905352 132505747203904 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0419 18:52:48.122794 132505747203904 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint
I0419 18:52:48.122903 132505747203904 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0419 18:52:49.544579 132505747203904 maxtext_utils.py:1654] params/params/decoder/decoder_norm/scale
Shape: float32[2048]
Logical: P('norm',)
Physical: (None,)
I0419 18:52:49.544726 132505747203904 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 18:52:49.544807 132505747203904 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 18:52:49.544892 132505747203904 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 18:52:49.544977 132505747203904 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 18:52:49.545037 132505747203904 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 18:52:49.545112 132505747203904 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 18:52:49.545185 132505747203904 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 18:52:49.545245 132505747203904 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 18:52:49.545300 132505747203904 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 18:52:49.545369 132505747203904 maxtext_utils.py:1654] params/params/decoder/logits_dense/kernel
Shape: float32[2048,32000]
Logical: P('embed_vocab', 'vocab')
Physical: ('fsdp', None)
I0419 18:52:49.545445 132505747203904 maxtext_utils.py:1654] params/params/token_embedder/embedding
Shape: float32[32000,2048]
Logical: P('vocab', 'embed_vocab')
Physical: (None, 'fsdp')
I0419 18:52:50.042937 132505747203904 train.py:155] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0419 18:52:50.043034 132505747203904 train.py:155] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0419 18:52:50.058370 132505747203904 train.py:162] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0419 18:52:50.058440 132505747203904 train.py:162] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0419 18:53:01.111162 132505747203904 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 18:53:01.112006 132505747203904 metric_logger.py:301] number parameters: 1.104 billion
I0419 18:53:12.516307 132505747203904 checkpointing.py:772] Waiting for step 0 to finish before checkpoint...
I0419 18:53:12.670022 132505747203904 checkpointing.py:776] Waited 0.15369367599487305 seconds for step 0 to finish before starting checkpointing.
I0419 18:53:12.672617 132505747203904 checkpoint_manager.py:2009] [process=2][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0419 18:53:12.674293 132505747203904 checkpoint_manager.py:1512] [process=2] Saving checkpoint at step 0
I0419 18:53:12.675731 132505747203904 event_tracking.py:70] [process=2] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_11_optimizer_offload_false/checkpoints/0.
I0419 18:53:13.448668 132505747203904 signaling_client.py:364] Using JaxDistributedSignalingClient
I0419 18:53:13.449553 132505747203904 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0419 18:53:13.449610 132505747203904 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 18:53:13.722117 132505747203904 base_pytree_checkpoint_handler.py:154] [process=2][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.273527s
I0419 18:53:13.722287 132505747203904 base_pytree_checkpoint_handler.py:130] [process=2] /jax/orbax/write/blocking_gbytes_per_sec: 5.526 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.27916646003723145 s) (per-host)
I0419 18:53:13.722341 132505747203904 base_pytree_checkpoint_handler.py:768] [process=2][thread=MainThread] Initiated Pytree async_save. Time taken: 0.279231s (batch_requests_ready=0.002342s, total_serialization_initiated=0.276817s, others=0.000072s)
I0419 18:53:13.722436 132505747203904 composite_checkpoint_handler.py:715] [process=2][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.283389s (all_items=0.000017s, per_item={'items': '0.00001717'}, temp_paths=0.283371)
I0419 18:53:13.723197 132505747203904 event_tracking.py:125] [process=2] [async] Finished blocking save in 1.05 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_11_optimizer_offload_false/checkpoints/0.
I0419 18:53:13.723544 132377747031808 async_checkpointer.py:76] [process=2][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-19 19:13:13.723492
I0419 18:53:13.735925 132505747203904 checkpoint_manager.py:1560] [process=2][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0419 18:53:13.736230 132370816558848 async_checkpointer.py:280] [process=2][thread=save_finalize] Waiting for background save thread=async_save.
I0419 18:53:13.736388 132505747203904 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_11_optimizer_offload_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776624792.6725986, 'wait_for_prev_duration_secs': 6.508827209472656e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776624792.674333, 'checkpointer_blocking_duration_secs': 1.0493605136871338, 'get_old_steps_start_time': 1776624793.7237182, 'get_old_steps_duration_secs': 3.0517578125e-05, 'checkpoint_manager_blocking_start_time': 1776624792.6705792, 'checkpoint_manager_blocking_duration_secs': 1.0657711029052734}
I0419 18:53:13.736500 132505747203904 checkpointing.py:408] Started an asynchronous checkpoint save for step 0
I0419 18:53:13.736563 132505747203904 max_utils.py:750]
Memstats: After params initialized:
I0419 18:53:13.736615 132505747203904 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_8(process=2,(0,2,0,0))
I0419 18:53:13.736645 132505747203904 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_9(process=2,(1,2,0,0))
I0419 18:53:13.736672 132505747203904 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_12(process=2,(0,3,0,0))
I0419 18:53:13.736696 132505747203904 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_13(process=2,(1,3,0,0))
I0419 18:53:14.047052 132505747203904 metric_logger.py:196] completed step: 0, seconds: 11.404, TFLOP/s/device: 1.191, Tokens/s/device: 179.583, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0419 18:53:14.239188 132505747203904 metric_logger.py:196] completed step: 1, seconds: 1.529, TFLOP/s/device: 8.885, Tokens/s/device: 1339.277, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0419 18:53:14.648970 132505747203904 metric_logger.py:196] completed step: 2, seconds: 0.045, TFLOP/s/device: 301.668, Tokens/s/device: 45470.693, total_weights: 65536, loss: 10.262, lm_loss: 10.262, perplexity: 28637.129
I0419 18:53:14.796282 132505747203904 metric_logger.py:196] completed step: 3, seconds: 0.410, TFLOP/s/device: 33.168, Tokens/s/device: 4999.451, total_weights: 65536, loss: 9.734, lm_loss: 9.734, perplexity: 16889.203
I0419 18:53:15.091446 132505747203904 metric_logger.py:196] completed step: 4, seconds: 0.153, TFLOP/s/device: 88.647, Tokens/s/device: 13361.779, total_weights: 65536, loss: 9.277, lm_loss: 9.277, perplexity: 10694.614
I0419 18:53:15.097263 132505747203904 metric_logger.py:196] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.155, Tokens/s/device: 13890.585, total_weights: 65536, loss: 8.892, lm_loss: 8.892, perplexity: 7270.717
I0419 18:53:18.012415 2843 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0419 18:53:20.564696 132370824951552 array_metadata_store.py:203] [process=2][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_11_optimizer_offload_false/checkpoints/0/items/array_metadatas/process_2
I0419 18:53:37.481280 132505747203904 metric_logger.py:196] completed step: 6, seconds: 0.295, TFLOP/s/device: 45.998, Tokens/s/device: 6933.301, total_weights: 65536, loss: 8.592, lm_loss: 8.592, perplexity: 5390.759
I0419 18:53:37.628714 132505747203904 metric_logger.py:196] completed step: 7, seconds: 22.237, TFLOP/s/device: 0.611, Tokens/s/device: 92.097, total_weights: 65536, loss: 8.384, lm_loss: 8.384, perplexity: 4376.905
I0419 18:53:37.776173 132505747203904 metric_logger.py:196] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.299, Tokens/s/device: 13460.136, total_weights: 65536, loss: 8.255, lm_loss: 8.255, perplexity: 3846.406
I0419 18:53:37.922804 132505747203904 checkpointing.py:772] Waiting for step 9 to finish before checkpoint...
I0419 18:53:37.923449 132505747203904 checkpointing.py:776] Waited 0.0006644725799560547 seconds for step 9 to finish before starting checkpointing.
I0419 18:53:37.925742 132505747203904 checkpoint_manager.py:2020] [process=2][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0419 18:53:51.817076 132377747031808 base_pytree_checkpoint_handler.py:130] [process=2] /jax/orbax/write/gbytes_per_sec: 41.163 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 38.3739287853241 s) (per-host)
I0419 18:53:51.817187 132377747031808 async_checkpointer.py:90] [process=2][thread=async_save] 3 Handler Commit operations completed. Time taken: 38.093533s.
I0419 18:54:00.891832 132377747031808 async_checkpointer.py:160] [process=2][thread=async_save] Background save thread done. Time taken: 47.168162s.
I0419 18:54:00.892121 132370816558848 async_checkpointer.py:288] [process=2][thread=save_finalize] Done with waiting for background save thread=async_save.
I0419 18:54:00.892255 132370816558848 async_checkpointer.py:298] [process=2][thread=save_finalize] No errors found in background save thread=async_save.
I0419 18:54:00.892306 132370816558848 checkpoint_manager.py:2137] [process=2][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0419 18:54:00.894012 132370816558848 checkpoint_manager.py:2146] [process=2][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0419 18:54:00.894185 132505747203904 checkpoint_manager.py:2032] [process=2][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0.
W0419 18:54:00.894334 132505747203904 checkpoint_manager.py:1452] Waiting for previous save to complete took 22.968592 seconds. If this number is high, consider checkpointing less frequently.
I0419 18:54:00.896203 132505747203904 checkpoint_manager.py:1512] [process=2] Saving checkpoint at step 9
I0419 18:54:00.898254 132505747203904 event_tracking.py:70] [process=2] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_11_optimizer_offload_false/checkpoints/9.
I0419 18:54:01.618540 132505747203904 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0419 18:54:01.618635 132505747203904 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 18:54:01.660621 132505747203904 base_pytree_checkpoint_handler.py:154] [process=2][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.043107s
I0419 18:54:01.660774 132505747203904 base_pytree_checkpoint_handler.py:130] [process=2] /jax/orbax/write/blocking_gbytes_per_sec: 33.068 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.04664921760559082 s) (per-host)
I0419 18:54:01.660822 132505747203904 base_pytree_checkpoint_handler.py:768] [process=2][thread=MainThread] Initiated Pytree async_save. Time taken: 0.046706s (batch_requests_ready=0.001911s, total_serialization_initiated=0.044732s, others=0.000063s)
I0419 18:54:01.660906 132505747203904 composite_checkpoint_handler.py:715] [process=2][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.050837s (all_items=0.000014s, per_item={'items': '0.00001407'}, temp_paths=0.050823)
I0419 18:54:01.661610 132505747203904 event_tracking.py:125] [process=2] [async] Finished blocking save in 0.77 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_11_optimizer_offload_false/checkpoints/9.
I0419 18:54:01.661987 132370816558848 async_checkpointer.py:76] [process=2][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-19 19:14:01.661949
I0419 18:54:01.663963 132505747203904 checkpoint_manager.py:1560] [process=2][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0419 18:54:01.664221 132370824951552 async_checkpointer.py:280] [process=2][thread=save_finalize] Waiting for background save thread=async_save.
I0419 18:54:01.664382 132505747203904 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_11_optimizer_offload_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776624817.9257107, 'wait_for_prev_duration_secs': 22.968592405319214, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776624840.8962476, 'checkpointer_blocking_duration_secs': 0.7658839225769043, 'get_old_steps_start_time': 1776624841.6621542, 'get_old_steps_duration_secs': 3.743171691894531e-05, 'checkpoint_manager_blocking_start_time': 1776624817.9237006, 'checkpoint_manager_blocking_duration_secs': 23.740647792816162}
I0419 18:54:01.664495 132505747203904 checkpointing.py:408] Started an asynchronous checkpoint save for step 9
I0419 18:54:01.664553 132505747203904 checkpoint_manager.py:2020] [process=2][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0419 18:54:07.902776 132354987259648 array_metadata_store.py:203] [process=2][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260419_180002/linen_xpk_main_20260419_180002_11_optimizer_offload_false/checkpoints/9/items/array_metadatas/process_2
I0419 18:54:43.433740 132370816558848 base_pytree_checkpoint_handler.py:130] [process=2] /jax/orbax/write/gbytes_per_sec: 37.772 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 41.81957411766052 s) (per-host)
I0419 18:54:43.433869 132370816558848 async_checkpointer.py:90] [process=2][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.771767s.
I0419 18:54:51.899147 132370816558848 async_checkpointer.py:160] [process=2][thread=async_save] Background save thread done. Time taken: 50.237024s.
I0419 18:54:51.899446 132370824951552 async_checkpointer.py:288] [process=2][thread=save_finalize] Done with waiting for background save thread=async_save.
I0419 18:54:51.899595 132370824951552 async_checkpointer.py:298] [process=2][thread=save_finalize] No errors found in background save thread=async_save.
I0419 18:54:51.899646 132370824951552 checkpoint_manager.py:2137] [process=2][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0419 18:54:51.900857 132370824951552 checkpoint_manager.py:2146] [process=2][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0419 18:54:51.901041 132505747203904 checkpoint_manager.py:2032] [process=2][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9.
I0419 18:54:51.901197 132505747203904 checkpoint_manager.py:2009] [process=2][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0419 18:54:51.902154 132505747203904 metric_logger.py:196] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.185, Tokens/s/device: 13895.108, total_weights: 65536, loss: 8.179, lm_loss: 8.179, perplexity: 3564.635
Per train step:
Total TFLOPs: 13.59
split as 93.93% learnable weight flops and 6.07% attention flops
XPK End: Sun Apr 19 18:55:00 UTC 2026
EXIT_CODE=0