MaxView

XPK Start: Tue Apr 21 16:25:54 UTC 2026
PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used.
2026-04-21 16:26:18.102508: 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)
I0421 16:26:18.635234 133379962767168 max_utils.py:273] Attempting to initialize the jax distributed system...
I0421 16:26:27.675275 133379962767168 distributed.py:149] Starting JAX distributed service on [::]:8482
I0421 16:26:27.677822 133379962767168 distributed.py:172] Connecting to JAX distributed service on mt-02-synthetic-zm5pi-slice-job-0-0.mt-02-synthetic-zm5pi:8482
I0421 16:26:28.476121 133379962767168 max_utils.py:284] Jax distributed system initialized!
I0421 16:26:34.698212 133379962767168 max_utils.py:800] System Information: Jax Version: 0.9.2
I0421 16:26:34.698313 133379962767168 max_utils.py:801] System Information: Jaxlib Version: 0.9.2
I0421 16:26:34.698352 133379962767168 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
I0421 16:26:34.698386 133379962767168 train_utils.py:378] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0421 16:26:35.394785 133379962767168 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0421 16:26:35.395372 133379962767168 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0421 16:26:35.395547 133379962767168 checkpointing.py:688] Setting up checkpoint logger...
I0421 16:26:35.395597 133379962767168 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True
I0421 16:26:35.395640 133379962767168 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None
I0421 16:26:35.395978 133379962767168 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 0x794e58f8dbe0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0421 16:26:38.301059 133379962767168 checkpointing.py:266] Enabling policy for fixed interval checkpointing.
I0421 16:26:38.301240 133379962767168 checkpoint_manager.py:708] [process=3][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7939245f6330>}, handler_registry=None
I0421 16:26:38.301466 133379962767168 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7939245f6330>` 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`.
I0421 16:26:38.301514 133379962767168 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7939244261e0>` 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`.
I0421 16:26:38.301549 133379962767168 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 0x7939245f6330>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7939245f6330>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7939244261e0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7939244261e0>}).
I0421 16:26:38.301860 133379962767168 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34
I0421 16:26:38.301942 133379962767168 async_checkpointer.py:192] [process=3][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7939047c3ec0> timeout: 1200 secs and primary_host=0 for async checkpoint writes
I0421 16:26:39.496027 133379962767168 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900/linen_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900_02_synthetic/checkpoints
I0421 16:26:39.535756 133379962767168 checkpoint_manager.py:929] [process=3][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_feat_nnx_trainstate_and_training_loop_20260421_161900/linen_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900_02_synthetic/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x793924379040>
I0421 16:26:39.535893 133379962767168 checkpointing.py:302] Checkpoint manager created!
I0421 16:26:40.480556 133379962767168 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0421 16:26:40.480655 133379962767168 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0421 16:26:40.858586 133379962767168 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0421 16:26:40.858674 133379962767168 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0421 16:26:40.874969 133379962767168 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0421 16:26:40.875029 133379962767168 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0421 16:26:40.898496 133379962767168 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0421 16:26:40.898564 133379962767168 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0421 16:26:40.914836 133379962767168 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0421 16:26:40.914896 133379962767168 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0421 16:26:40.931017 133379962767168 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0421 16:26:40.931085 133379962767168 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0421 16:26:40.956177 133379962767168 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0421 16:26:40.956253 133379962767168 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0421 16:26:40.976900 133379962767168 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0421 16:26:40.976980 133379962767168 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0421 16:26:41.190412 133379962767168 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint
I0421 16:26:41.190563 133379962767168 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0421 16:26:42.611901 133379962767168 maxtext_utils.py:1821]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   P('norm',)
    Physical:  (None,)
I0421 16:26:42.612038 133379962767168 maxtext_utils.py:1821]  params/params/decoder/layers/mlp/wi_0/kernel
    Shape:     float32[2048,16,7168]
    Logical:   P('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0421 16:26:42.612091 133379962767168 maxtext_utils.py:1821]  params/params/decoder/layers/mlp/wi_1/kernel
    Shape:     float32[2048,16,7168]
    Logical:   P('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0421 16:26:42.612151 133379962767168 maxtext_utils.py:1821]  params/params/decoder/layers/mlp/wo/kernel
    Shape:     float32[7168,16,2048]
    Logical:   P('mlp', 'layers', 'embed')
    Physical:  (None, None, 'fsdp')
I0421 16:26:42.612231 133379962767168 maxtext_utils.py:1821]  params/params/decoder/layers/post_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   P('norm', 'layers')
    Physical:  (None, None)
I0421 16:26:42.612290 133379962767168 maxtext_utils.py:1821]  params/params/decoder/layers/pre_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   P('norm', 'layers')
    Physical:  (None, None)
I0421 16:26:42.612356 133379962767168 maxtext_utils.py:1821]  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)
I0421 16:26:42.612409 133379962767168 maxtext_utils.py:1821]  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')
I0421 16:26:42.612454 133379962767168 maxtext_utils.py:1821]  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)
I0421 16:26:42.612491 133379962767168 maxtext_utils.py:1821]  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)
I0421 16:26:42.612539 133379962767168 maxtext_utils.py:1821]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   P('embed_vocab', 'vocab')
    Physical:  ('fsdp', None)

I0421 16:26:42.612585 133379962767168 maxtext_utils.py:1821]  params/params/token_embedder/embedding
    Shape:     float32[32000,2048]
    Logical:   P('vocab', 'embed_vocab')
    Physical:  (None, 'fsdp')
I0421 16:26:43.101752 133379962767168 train.py:157] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0421 16:26:43.101849 133379962767168 train.py:157] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0421 16:26:43.117237 133379962767168 train.py:164] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0421 16:26:43.117297 133379962767168 train.py:164] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0421 16:26:54.097487 133379962767168 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.
I0421 16:26:54.098281 133379962767168 metric_logger.py:301] number parameters: 1.104 billion
I0421 16:27:05.256308 133379962767168 checkpointing.py:794] Waiting for step 0 to finish before checkpoint...
I0421 16:27:05.598646 133379962767168 checkpointing.py:798] Waited 0.34232068061828613 seconds for step 0 to finish before starting checkpointing.
I0421 16:27:05.601067 133379962767168 checkpoint_manager.py:2009] [process=3][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0421 16:27:05.602755 133379962767168 checkpoint_manager.py:1512] [process=3] Saving checkpoint at step 0
I0421 16:27:05.604291 133379962767168 event_tracking.py:70] [process=3] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900/linen_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900_02_synthetic/checkpoints/0.
I0421 16:27:06.346171 133379962767168 signaling_client.py:364] Using JaxDistributedSignalingClient
I0421 16:27:06.347208 133379962767168 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0421 16:27:06.347264 133379962767168 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
I0421 16:27:06.618973 133379962767168 base_pytree_checkpoint_handler.py:154] [process=3][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.272875s
I0421 16:27:06.619144 133379962767168 base_pytree_checkpoint_handler.py:130] [process=3] /jax/orbax/write/blocking_gbytes_per_sec: 5.543 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2783043384552002 s) (per-host)
I0421 16:27:06.619195 133379962767168 base_pytree_checkpoint_handler.py:768] [process=3][thread=MainThread] Initiated Pytree async_save. Time taken: 0.278364s (batch_requests_ready=0.002183s, total_serialization_initiated=0.276113s, others=0.000067s)
I0421 16:27:06.619281 133379962767168 composite_checkpoint_handler.py:715] [process=3][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.282592s (all_items=0.000021s, per_item={'items': '0.00002050'}, temp_paths=0.282571)
I0421 16:27:06.620032 133379962767168 event_tracking.py:125] [process=3] [async] Finished blocking save in 1.02 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900/linen_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900_02_synthetic/checkpoints/0.
I0421 16:27:06.620358 133250551994112 async_checkpointer.py:76] [process=3][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-21 16:47:06.620322
I0421 16:27:06.631567 133379962767168 checkpoint_manager.py:1560] [process=3][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0421 16:27:06.631858 133247862302464 async_checkpointer.py:280] [process=3][thread=save_finalize] Waiting for background save thread=async_save.
I0421 16:27:06.631999 133379962767168 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900/linen_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900_02_synthetic/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776788825.6010482, 'wait_for_prev_duration_secs': 6.031990051269531e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776788825.6027927, 'checkpointer_blocking_duration_secs': 1.0177114009857178, 'get_old_steps_start_time': 1776788826.6205263, 'get_old_steps_duration_secs': 2.9802322387695312e-05, 'checkpoint_manager_blocking_start_time': 1776788825.5991378, 'checkpoint_manager_blocking_duration_secs': 1.032827377319336}
I0421 16:27:06.632154 133379962767168 checkpointing.py:409] Started an asynchronous checkpoint save for step 0
I0421 16:27:06.632203 133379962767168 max_utils.py:750] 
Memstats: After params initialized:
I0421 16:27:06.632250 133379962767168 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_10(process=3,(2,2,0,0))
I0421 16:27:06.632282 133379962767168 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_11(process=3,(3,2,0,0))
I0421 16:27:06.632308 133379962767168 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_14(process=3,(2,3,0,0))
I0421 16:27:06.632333 133379962767168 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_15(process=3,(3,3,0,0))
I0421 16:27:06.947955 133379962767168 metric_logger.py:196] completed step: 0, seconds: 11.158, TFLOP/s/device: 1.218, Tokens/s/device: 183.547, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0421 16:27:07.116681 133379962767168 metric_logger.py:196] completed step: 1, seconds: 1.690, TFLOP/s/device: 8.039, Tokens/s/device: 1211.765, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0421 16:27:07.537710 133379962767168 metric_logger.py:196] completed step: 2, seconds: 0.021, TFLOP/s/device: 635.002, Tokens/s/device: 95714.352, total_weights: 65536, loss: 10.262, lm_loss: 10.262, perplexity: 28637.129
I0421 16:27:07.684986 133379962767168 metric_logger.py:196] completed step: 3, seconds: 0.421, TFLOP/s/device: 32.276, Tokens/s/device: 4865.001, total_weights: 65536, loss: 9.734, lm_loss: 9.734, perplexity: 16889.203
I0421 16:27:07.980389 133379962767168 metric_logger.py:196] completed step: 4, seconds: 0.153, TFLOP/s/device: 88.604, Tokens/s/device: 13355.418, total_weights: 65536, loss: 9.277, lm_loss: 9.277, perplexity: 10694.614
I0421 16:27:07.986261 133379962767168 metric_logger.py:196] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.137, Tokens/s/device: 13887.947, total_weights: 65536, loss: 8.892, lm_loss: 8.892, perplexity: 7270.717
I0421 16:27:09.637499    2858 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0421 16:27:11.663434 133247870695168 array_metadata_store.py:203] [process=3][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900/linen_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900_02_synthetic/checkpoints/0/items/array_metadatas/process_3
I0421 16:27:30.113720 133379962767168 metric_logger.py:196] completed step: 6, seconds: 0.296, TFLOP/s/device: 45.957, Tokens/s/device: 6927.133, total_weights: 65536, loss: 8.592, lm_loss: 8.592, perplexity: 5390.759
I0421 16:27:30.261109 133379962767168 metric_logger.py:196] completed step: 7, seconds: 21.981, TFLOP/s/device: 0.618, Tokens/s/device: 93.173, total_weights: 65536, loss: 8.384, lm_loss: 8.384, perplexity: 4376.905
I0421 16:27:30.408344 133379962767168 metric_logger.py:196] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.189, Tokens/s/device: 13443.525, total_weights: 65536, loss: 8.255, lm_loss: 8.255, perplexity: 3846.406
I0421 16:27:30.554979 133379962767168 checkpointing.py:794] Waiting for step 9 to finish before checkpoint...
I0421 16:27:30.555636 133379962767168 checkpointing.py:798] Waited 0.0007040500640869141 seconds for step 9 to finish before starting checkpointing.
I0421 16:27:30.557758 133379962767168 checkpoint_manager.py:2020] [process=3][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0421 16:27:43.265312 133250551994112 base_pytree_checkpoint_handler.py:130] [process=3] /jax/orbax/write/gbytes_per_sec: 42.779 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 36.9244327545166 s) (per-host)
I0421 16:27:43.265437 133250551994112 async_checkpointer.py:90] [process=3][thread=async_save] 3 Handler Commit operations completed. Time taken: 36.644965s.
I0421 16:27:52.705418 133250551994112 async_checkpointer.py:160] [process=3][thread=async_save] Background save thread done. Time taken: 46.084934s.
I0421 16:27:52.705744 133247862302464 async_checkpointer.py:288] [process=3][thread=save_finalize] Done with waiting for background save thread=async_save.
I0421 16:27:52.705863 133247862302464 async_checkpointer.py:298] [process=3][thread=save_finalize] No errors found in background save thread=async_save.
I0421 16:27:52.705914 133247862302464 checkpoint_manager.py:2137] [process=3][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0421 16:27:52.707485 133247862302464 checkpoint_manager.py:2146] [process=3][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0421 16:27:52.707661 133379962767168 checkpoint_manager.py:2032] [process=3][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0.
W0421 16:27:52.707797 133379962767168 checkpoint_manager.py:1452] Waiting for previous save to complete took 22.150039 seconds. If this number is high, consider checkpointing less frequently.
I0421 16:27:52.709621 133379962767168 checkpoint_manager.py:1512] [process=3] Saving checkpoint at step 9
I0421 16:27:52.711487 133379962767168 event_tracking.py:70] [process=3] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900/linen_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900_02_synthetic/checkpoints/9.
I0421 16:27:53.116652 133379962767168 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0421 16:27:53.116749 133379962767168 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
I0421 16:27:53.152800 133379962767168 base_pytree_checkpoint_handler.py:154] [process=3][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.037257s
I0421 16:27:53.152977 133379962767168 base_pytree_checkpoint_handler.py:130] [process=3] /jax/orbax/write/blocking_gbytes_per_sec: 37.895 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.04070687294006348 s) (per-host)
I0421 16:27:53.153029 133379962767168 base_pytree_checkpoint_handler.py:768] [process=3][thread=MainThread] Initiated Pytree async_save. Time taken: 0.040769s (batch_requests_ready=0.001793s, total_serialization_initiated=0.038906s, others=0.000070s)
I0421 16:27:53.153117 133379962767168 composite_checkpoint_handler.py:715] [process=3][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.044910s (all_items=0.000016s, per_item={'items': '0.00001621'}, temp_paths=0.044894)
I0421 16:27:53.153866 133379962767168 event_tracking.py:125] [process=3] [async] Finished blocking save in 0.44 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900/linen_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900_02_synthetic/checkpoints/9.
I0421 16:27:53.154163 133247862302464 async_checkpointer.py:76] [process=3][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-21 16:47:53.154139
I0421 16:27:53.157306 133379962767168 checkpoint_manager.py:1560] [process=3][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0421 16:27:53.157537 133250508334848 async_checkpointer.py:280] [process=3][thread=save_finalize] Waiting for background save thread=async_save.
I0421 16:27:53.157694 133379962767168 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900/linen_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900_02_synthetic/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776788850.5577278, 'wait_for_prev_duration_secs': 22.150038719177246, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776788872.7096605, 'checkpointer_blocking_duration_secs': 0.44460082054138184, 'get_old_steps_start_time': 1776788873.1542847, 'get_old_steps_duration_secs': 2.7418136596679688e-05, 'checkpoint_manager_blocking_start_time': 1776788850.555855, 'checkpoint_manager_blocking_duration_secs': 22.601806163787842}
I0421 16:27:53.157801 133379962767168 checkpointing.py:409] Started an asynchronous checkpoint save for step 9
I0421 16:27:53.157845 133379962767168 checkpoint_manager.py:2020] [process=3][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0421 16:27:58.690462 133250516727552 array_metadata_store.py:203] [process=3][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900/linen_xpk_feat_nnx_trainstate_and_training_loop_20260421_161900_02_synthetic/checkpoints/9/items/array_metadatas/process_3
I0421 16:28:34.906959 133247862302464 base_pytree_checkpoint_handler.py:130] [process=3] /jax/orbax/write/gbytes_per_sec: 37.794 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 41.794628381729126 s) (per-host)
I0421 16:28:34.907081 133247862302464 async_checkpointer.py:90] [process=3][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.752841s.
I0421 16:28:44.747237 133247862302464 async_checkpointer.py:160] [process=3][thread=async_save] Background save thread done. Time taken: 51.592983s.
I0421 16:28:44.747527 133250508334848 async_checkpointer.py:288] [process=3][thread=save_finalize] Done with waiting for background save thread=async_save.
I0421 16:28:44.747637 133250508334848 async_checkpointer.py:298] [process=3][thread=save_finalize] No errors found in background save thread=async_save.
I0421 16:28:44.747684 133250508334848 checkpoint_manager.py:2137] [process=3][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0421 16:28:44.749285 133250508334848 checkpoint_manager.py:2146] [process=3][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0421 16:28:44.749476 133379962767168 checkpoint_manager.py:2032] [process=3][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9.
I0421 16:28:44.749621 133379962767168 checkpoint_manager.py:2009] [process=3][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0421 16:28:44.750447 133379962767168 metric_logger.py:196] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.253, Tokens/s/device: 13905.392, 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: Tue Apr 21 16:28:55 UTC 2026
EXIT_CODE=0