XPK Start: Sat Apr 18 18:20:34 UTC 2026
PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used.
2026-04-18 18:20:58.747697: 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)
I0418 18:20:59.279374 138120810325824 max_utils.py:273] Attempting to initialize the jax distributed system...
I0418 18:21:08.318775 138120810325824 distributed.py:149] Starting JAX distributed service on [::]:8482
I0418 18:21:08.321148 138120810325824 distributed.py:172] Connecting to JAX distributed service on mt-06-grad-accum-0jggr-slice-job-0-0.mt-06-grad-accum-0jggr:8482
I0418 18:21:09.061537 138120810325824 max_utils.py:284] Jax distributed system initialized!
I0418 18:21:15.305518 138120810325824 max_utils.py:800] System Information: Jax Version: 0.9.2
I0418 18:21:15.305618 138120810325824 max_utils.py:801] System Information: Jaxlib Version: 0.9.2
I0418 18:21:15.305668 138120810325824 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
I0418 18:21:15.305708 138120810325824 train_utils.py:348] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0418 18:21:16.021094 138120810325824 maxtext_utils.py:1551] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0418 18:21:16.021367 138120810325824 checkpointing.py:677] Setting up checkpoint logger...
I0418 18:21:16.021421 138120810325824 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True
I0418 18:21:16.021479 138120810325824 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None
I0418 18:21:16.021821 138120810325824 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 0x7d9e0a0481a0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0418 18:21:20.187852 138120810325824 checkpointing.py:265] Enabling policy for fixed interval checkpointing.
I0418 18:21:20.188086 138120810325824 checkpoint_manager.py:708] [process=5][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7d8a044ef200>}, handler_registry=None
I0418 18:21:20.188320 138120810325824 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7d8a044ef200>` 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`.
I0418 18:21:20.188367 138120810325824 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d8a04304740>` 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`.
I0418 18:21:20.188402 138120810325824 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 0x7d8a044ef200>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7d8a044ef200>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d8a04304740>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d8a04304740>}).
I0418 18:21:20.188730 138120810325824 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34
I0418 18:21:20.188801 138120810325824 async_checkpointer.py:192] [process=5][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7d892c5cf880> timeout: 1200 secs and primary_host=0 for async checkpoint writes
I0418 18:21:21.333163 138120810325824 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_06_grad_accum/checkpoints
I0418 18:21:22.190575 138120810325824 checkpoint_manager.py:929] [process=5][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_20260418_180002/linen_xpk_main_20260418_180002_06_grad_accum/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7d8a04300fb0>
I0418 18:21:22.190736 138120810325824 checkpointing.py:301] Checkpoint manager created!
I0418 18:21:23.900480 138120810325824 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0418 18:21:23.900593 138120810325824 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0418 18:21:24.285784 138120810325824 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0418 18:21:24.285870 138120810325824 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0418 18:21:24.302419 138120810325824 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0418 18:21:24.302487 138120810325824 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0418 18:21:24.326354 138120810325824 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0418 18:21:24.326422 138120810325824 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 18:21:24.343260 138120810325824 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0418 18:21:24.343318 138120810325824 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 18:21:24.360033 138120810325824 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0418 18:21:24.360091 138120810325824 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 18:21:24.385735 138120810325824 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0418 18:21:24.385807 138120810325824 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 18:21:24.406907 138120810325824 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0418 18:21:24.406972 138120810325824 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0418 18:21:24.623523 138120810325824 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint
I0418 18:21:24.623625 138120810325824 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0418 18:21:26.055944 138120810325824 maxtext_utils.py:1654] params/params/decoder/decoder_norm/scale
Shape: float32[2048]
Logical: P('norm',)
Physical: (None,)
I0418 18:21:26.056072 138120810325824 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)
I0418 18:21:26.056124 138120810325824 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)
I0418 18:21:26.056180 138120810325824 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')
I0418 18:21:26.056235 138120810325824 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)
I0418 18:21:26.056272 138120810325824 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)
I0418 18:21:26.056321 138120810325824 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)
I0418 18:21:26.056371 138120810325824 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')
I0418 18:21:26.056409 138120810325824 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)
I0418 18:21:26.056444 138120810325824 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)
I0418 18:21:26.056567 138120810325824 maxtext_utils.py:1654] params/params/decoder/logits_dense/kernel
Shape: float32[2048,32000]
Logical: P('embed_vocab', 'vocab')
Physical: ('fsdp', None)
I0418 18:21:26.056620 138120810325824 maxtext_utils.py:1654] params/params/token_embedder/embedding
Shape: float32[32000,2048]
Logical: P('vocab', 'embed_vocab')
Physical: (None, 'fsdp')
I0418 18:21:26.079357 138120810325824 gradient_accumulation.py:68] gradient_accumulation/inputs Logical: float32[2048]............................................... Unknown.
I0418 18:21:26.079424 138120810325824 gradient_accumulation.py:68] gradient_accumulation/inputs Physical: float32[2048]............................................... (None,).
I0418 18:21:26.094476 138120810325824 gradient_accumulation.py:68] gradient_accumulation/inputs Logical: float32[2048,16,7168]....................................... Unknown.
I0418 18:21:26.094532 138120810325824 gradient_accumulation.py:68] gradient_accumulation/inputs Physical: float32[2048,16,7168]....................................... ('fsdp', None, None).
I0418 18:21:26.124304 138120810325824 gradient_accumulation.py:68] gradient_accumulation/inputs Logical: float32[7168,16,2048]....................................... Unknown.
I0418 18:21:26.124368 138120810325824 gradient_accumulation.py:68] gradient_accumulation/inputs Physical: float32[7168,16,2048]....................................... (None, None, 'fsdp').
I0418 18:21:26.139235 138120810325824 gradient_accumulation.py:68] gradient_accumulation/inputs Logical: float32[2048,16]............................................ Unknown.
I0418 18:21:26.139289 138120810325824 gradient_accumulation.py:68] gradient_accumulation/inputs Physical: float32[2048,16]............................................ (None, None).
I0418 18:21:26.169518 138120810325824 gradient_accumulation.py:68] gradient_accumulation/inputs Logical: float32[2048,16,16,128]..................................... Unknown.
I0418 18:21:26.169583 138120810325824 gradient_accumulation.py:68] gradient_accumulation/inputs Physical: float32[2048,16,16,128]..................................... ('fsdp', None, None, None).
I0418 18:21:26.184443 138120810325824 gradient_accumulation.py:68] gradient_accumulation/inputs Logical: float32[16,16,128,2048]..................................... Unknown.
I0418 18:21:26.184508 138120810325824 gradient_accumulation.py:68] gradient_accumulation/inputs Physical: float32[16,16,128,2048]..................................... (None, None, None, 'fsdp').
I0418 18:21:26.230402 138120810325824 gradient_accumulation.py:68] gradient_accumulation/inputs Logical: float32[2048,32000]......................................... Unknown.
I0418 18:21:26.230484 138120810325824 gradient_accumulation.py:68] gradient_accumulation/inputs Physical: float32[2048,32000]......................................... ('fsdp', None).
I0418 18:21:26.245301 138120810325824 gradient_accumulation.py:68] gradient_accumulation/inputs Logical: float32[32000,2048]......................................... Unknown.
I0418 18:21:26.245358 138120810325824 gradient_accumulation.py:68] gradient_accumulation/inputs Physical: float32[32000,2048]......................................... (None, 'fsdp').
I0418 18:21:26.911927 138120810325824 train.py:155] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0418 18:21:26.912023 138120810325824 train.py:155] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0418 18:21:26.927740 138120810325824 train.py:162] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0418 18:21:26.927803 138120810325824 train.py:162] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0418 18:21:38.331479 138120810325824 max_utils.py:791] Total memory size: 1.7 GB, Output size: 0.4 GB, Temp size: 1.3 GB, Argument size: 0.4 GB, Host temp size: 0.0 GB.
I0418 18:21:38.332359 138120810325824 metric_logger.py:301] number parameters: 1.104 billion
I0418 18:21:40.239638 138120810325824 checkpointing.py:772] Waiting for step 0 to finish before checkpoint...
I0418 18:21:50.993809 138120810325824 checkpointing.py:776] Waited 10.754153490066528 seconds for step 0 to finish before starting checkpointing.
I0418 18:21:50.996673 138120810325824 checkpoint_manager.py:2009] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0418 18:21:50.998681 138120810325824 checkpoint_manager.py:1512] [process=5] Saving checkpoint at step 0
I0418 18:21:51.000091 138120810325824 event_tracking.py:70] [process=5] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_06_grad_accum/checkpoints/0.
I0418 18:21:51.756288 138120810325824 signaling_client.py:364] Using JaxDistributedSignalingClient
I0418 18:21:51.757306 138120810325824 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0418 18:21:51.757362 138120810325824 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
I0418 18:21:52.031582 138120810325824 base_pytree_checkpoint_handler.py:154] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.275364s
I0418 18:21:52.031753 138120810325824 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/blocking_gbytes_per_sec: 5.496 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2806868553161621 s) (per-host)
I0418 18:21:52.031807 138120810325824 base_pytree_checkpoint_handler.py:768] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.280751s (batch_requests_ready=0.002174s, total_serialization_initiated=0.278505s, others=0.000071s)
I0418 18:21:52.031900 138120810325824 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.284828s (all_items=0.000018s, per_item={'items': '0.00001788'}, temp_paths=0.284810)
I0418 18:21:52.032742 138120810325824 event_tracking.py:125] [process=5] [async] Finished blocking save in 1.03 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_06_grad_accum/checkpoints/0.
I0418 18:21:52.033103 137993369503488 async_checkpointer.py:76] [process=5][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-18 18:41:52.033065
I0418 18:21:52.043927 138120810325824 checkpoint_manager.py:1560] [process=5][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0418 18:21:52.044234 137993352718080 async_checkpointer.py:280] [process=5][thread=save_finalize] Waiting for background save thread=async_save.
I0418 18:21:52.044387 138120810325824 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_06_grad_accum/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776536510.996654, 'wait_for_prev_duration_secs': 6.246566772460938e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776536510.9987192, 'checkpointer_blocking_duration_secs': 1.034545660018921, 'get_old_steps_start_time': 1776536512.0332894, 'get_old_steps_duration_secs': 2.9802322387695312e-05, 'checkpoint_manager_blocking_start_time': 1776536510.9943285, 'checkpoint_manager_blocking_duration_secs': 1.0500211715698242}
I0418 18:21:52.044503 138120810325824 checkpointing.py:408] Started an asynchronous checkpoint save for step 0
I0418 18:21:52.044552 138120810325824 max_utils.py:750]
Memstats: After params initialized:
I0418 18:21:52.044598 138120810325824 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_18(process=5,(2,4,0,0))
I0418 18:21:52.044629 138120810325824 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_19(process=5,(3,4,0,0))
I0418 18:21:52.044655 138120810325824 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_22(process=5,(2,5,0,0))
I0418 18:21:52.044678 138120810325824 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_23(process=5,(3,5,0,0))
I0418 18:21:52.351405 138120810325824 metric_logger.py:196] completed step: 0, seconds: 1.907, TFLOP/s/device: 28.497, Tokens/s/device: 4295.370, total_weights: 262144, loss: 10.877, lm_loss: 10.877, perplexity: 52959.059
I0418 18:21:52.971392 138120810325824 metric_logger.py:196] completed step: 1, seconds: 12.110, TFLOP/s/device: 4.488, Tokens/s/device: 676.449, total_weights: 262144, loss: 10.877, lm_loss: 10.877, perplexity: 52959.059
I0418 18:21:53.549937 138120810325824 metric_logger.py:196] completed step: 2, seconds: 0.041, TFLOP/s/device: 1314.608, Tokens/s/device: 198152.000, total_weights: 262144, loss: 10.563, lm_loss: 10.563, perplexity: 38662.707
I0418 18:21:54.128334 138120810325824 metric_logger.py:196] completed step: 3, seconds: 0.584, TFLOP/s/device: 93.036, Tokens/s/device: 14023.435, total_weights: 262144, loss: 10.272, lm_loss: 10.272, perplexity: 28909.668
I0418 18:21:55.285424 138120810325824 metric_logger.py:196] completed step: 4, seconds: 0.578, TFLOP/s/device: 93.955, Tokens/s/device: 14161.960, total_weights: 262144, loss: 10.022, lm_loss: 10.022, perplexity: 22524.992
I0418 18:21:55.290740 138120810325824 metric_logger.py:196] completed step: 5, seconds: 0.578, TFLOP/s/device: 93.965, Tokens/s/device: 14163.503, total_weights: 262144, loss: 9.820, lm_loss: 9.820, perplexity: 18401.865
I0418 18:21:55.797282 2571 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0418 18:21:58.958063 137996609795840 array_metadata_store.py:203] [process=5][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_06_grad_accum/checkpoints/0/items/array_metadatas/process_5
I0418 18:22:29.362634 137993369503488 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/gbytes_per_sec: 41.998 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 37.611533403396606 s) (per-host)
I0418 18:22:29.362752 137993369503488 async_checkpointer.py:90] [process=5][thread=async_save] 3 Handler Commit operations completed. Time taken: 37.329531s.
I0418 18:22:39.554933 137993369503488 async_checkpointer.py:160] [process=5][thread=async_save] Background save thread done. Time taken: 47.521695s.
I0418 18:22:39.555216 137993352718080 async_checkpointer.py:288] [process=5][thread=save_finalize] Done with waiting for background save thread=async_save.
I0418 18:22:39.555334 137993352718080 async_checkpointer.py:298] [process=5][thread=save_finalize] No errors found in background save thread=async_save.
I0418 18:22:39.555385 137993352718080 checkpoint_manager.py:2137] [process=5][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0418 18:22:40.449532 137993352718080 checkpoint_manager.py:2146] [process=5][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0418 18:22:41.746440 138120810325824 metric_logger.py:196] completed step: 6, seconds: 1.158, TFLOP/s/device: 46.952, Tokens/s/device: 7077.163, total_weights: 262144, loss: 9.667, lm_loss: 9.667, perplexity: 15787.604
I0418 18:22:42.325114 138120810325824 metric_logger.py:196] completed step: 7, seconds: 45.878, TFLOP/s/device: 1.185, Tokens/s/device: 178.562, total_weights: 262144, loss: 9.561, lm_loss: 9.561, perplexity: 14203.827
I0418 18:22:42.903517 138120810325824 metric_logger.py:196] completed step: 8, seconds: 0.583, TFLOP/s/device: 93.208, Tokens/s/device: 14049.289, total_weights: 262144, loss: 9.496, lm_loss: 9.496, perplexity: 13302.920
I0418 18:22:43.481658 138120810325824 checkpointing.py:772] Waiting for step 9 to finish before checkpoint...
I0418 18:22:43.482256 138120810325824 checkpointing.py:776] Waited 0.0006222724914550781 seconds for step 9 to finish before starting checkpointing.
I0418 18:22:43.484622 138120810325824 checkpoint_manager.py:2009] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0418 18:22:43.486362 138120810325824 checkpoint_manager.py:1512] [process=5] Saving checkpoint at step 9
I0418 18:22:43.487731 138120810325824 event_tracking.py:70] [process=5] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_06_grad_accum/checkpoints/9.
I0418 18:22:44.630259 138120810325824 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0418 18:22:44.630355 138120810325824 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
I0418 18:22:44.666225 138120810325824 base_pytree_checkpoint_handler.py:154] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.036979s
I0418 18:22:44.666381 138120810325824 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/blocking_gbytes_per_sec: 38.234 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.04034543037414551 s) (per-host)
I0418 18:22:44.666432 138120810325824 base_pytree_checkpoint_handler.py:768] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.040405s (batch_requests_ready=0.001625s, total_serialization_initiated=0.038715s, others=0.000066s)
I0418 18:22:44.666536 138120810325824 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.044580s (all_items=0.000015s, per_item={'items': '0.00001502'}, temp_paths=0.044565)
I0418 18:22:44.667249 138120810325824 event_tracking.py:125] [process=5] [async] Finished blocking save in 1.18 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_06_grad_accum/checkpoints/9.
I0418 18:22:44.667558 137993352718080 async_checkpointer.py:76] [process=5][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-18 18:42:44.667525
I0418 18:22:44.672501 138120810325824 checkpoint_manager.py:1560] [process=5][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0418 18:22:44.672764 137996609795840 async_checkpointer.py:280] [process=5][thread=save_finalize] Waiting for background save thread=async_save.
I0418 18:22:44.672898 138120810325824 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_06_grad_accum/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776536563.4845798, 'wait_for_prev_duration_secs': 0.00012946128845214844, 'time_between_consecutive_saves_sec': 3.0349531173706055, 'checkpointer_blocking_start_time': 1776536563.4864004, 'checkpointer_blocking_duration_secs': 1.1813042163848877, 'get_old_steps_start_time': 1776536564.66773, 'get_old_steps_duration_secs': 3.170967102050781e-05, 'checkpoint_manager_blocking_start_time': 1776536563.4824953, 'checkpoint_manager_blocking_duration_secs': 1.1903660297393799}
I0418 18:22:44.673012 138120810325824 checkpointing.py:408] Started an asynchronous checkpoint save for step 9
I0418 18:22:44.673057 138120810325824 checkpoint_manager.py:2020] [process=5][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0418 18:22:51.177536 137987450967808 array_metadata_store.py:203] [process=5][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_06_grad_accum/checkpoints/9/items/array_metadatas/process_5
I0418 18:23:26.417444 137993352718080 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/gbytes_per_sec: 37.797 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 41.79137110710144 s) (per-host)
I0418 18:23:26.417586 137993352718080 async_checkpointer.py:90] [process=5][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.749918s.
I0418 18:23:34.962885 137993352718080 async_checkpointer.py:160] [process=5][thread=async_save] Background save thread done. Time taken: 50.295202s.
I0418 18:23:34.963245 137996609795840 async_checkpointer.py:288] [process=5][thread=save_finalize] Done with waiting for background save thread=async_save.
I0418 18:23:34.963366 137996609795840 async_checkpointer.py:298] [process=5][thread=save_finalize] No errors found in background save thread=async_save.
I0418 18:23:34.963411 137996609795840 checkpoint_manager.py:2137] [process=5][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0418 18:23:34.964733 137996609795840 checkpoint_manager.py:2146] [process=5][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0418 18:23:34.964928 138120810325824 checkpoint_manager.py:2032] [process=5][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9.
I0418 18:23:34.965081 138120810325824 checkpoint_manager.py:2009] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0418 18:23:34.965996 138120810325824 metric_logger.py:196] completed step: 9, seconds: 0.579, TFLOP/s/device: 93.923, Tokens/s/device: 14157.065, total_weights: 262144, loss: 9.457, lm_loss: 9.457, perplexity: 12802.546
Per train step:
Total TFLOPs: 54.35
split as 93.93% learnable weight flops and 6.07% attention flops
XPK End: Sat Apr 18 18:23:45 UTC 2026
EXIT_CODE=0