MaxView

Timing Test Reference Updates
‹ 16_zarr3_true_resumeCase: 16_zarr3_true_save— ›

Metrics: main (586e69205) vs feat/nnx-set-defaults-true (73213e044)

Metricmain  586e69205feat/nnx-set-defaults-true  73213e044Diff (feat/nnx-set-defaults-true − main)
Parameters1.104 billion1.104 billion—
Final loss7.18107.18100
TFLOP/s92.17292.300+0.128
Tok/s13893.113912.5+19.347
Avg s/step7.9207.314-0.606
Memory %1.381.380
JAX0.9.20.8.1—

Diff = branch value − main value. Green = branch improved. Red = branch regressed.

main  ·  586e69205  ·  main_20260423_071538  ·  full log 
XPK Start: Thu Apr 23 08:36:49 UTC 2026
PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used.
`rope_parameters`'s factor field must be a float >= 1, got 40
`rope_parameters`'s beta_fast field must be a float, got 32
`rope_parameters`'s beta_slow field must be a float, got 1
DeepseekV32Config got `key=rope_scaling` in kwargs but hasn't set it as attribute. For RoPE standardization you need to set `self.rope_parameters` in model's config. 
2026-04-23 08:37:14.653715: 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)
I0423 08:37:14.867997 135368962934592 max_utils.py:273] Attempting to initialize the jax distributed system...
I0423 08:37:23.909064 135368962934592 distributed.py:149] Starting JAX distributed service on [::]:8482
I0423 08:37:23.914573 135368962934592 distributed.py:172] Connecting to JAX distributed service on mt-16-zarr3-true-sv-pe65r-slice-job-0-0.mt-16-zarr3-true-sv-pe65r:8482
I0423 08:37:25.110413 135368962934592 max_utils.py:284] Jax distributed system initialized!
I0423 08:37:30.309858 135368962934592 max_utils.py:800] System Information: Jax Version: 0.9.2
I0423 08:37:30.309963 135368962934592 max_utils.py:801] System Information: Jaxlib Version: 0.9.2
I0423 08:37:30.310002 135368962934592 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
I0423 08:37:30.310035 135368962934592 train_utils.py:361] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0423 08:37:31.005220 135368962934592 maxtext_utils.py:1604] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0423 08:37:31.005502 135368962934592 checkpointing.py:677] Setting up checkpoint logger...
I0423 08:37:31.005557 135368962934592 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True
I0423 08:37:31.005601 135368962934592 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None
I0423 08:37:31.005938 135368962934592 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 0x7b1d5324c860>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0423 08:37:33.853424 135368962934592 checkpointing.py:265] Enabling policy for fixed interval checkpointing.
I0423 08:37:33.853663 135368962934592 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 0x7b09c42e4c20>}, handler_registry=None
I0423 08:37:33.853906 135368962934592 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7b09c42e4c20>` 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`.
I0423 08:37:33.853953 135368962934592 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7b09e41e3e00>` 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`.
I0423 08:37:33.853989 135368962934592 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 0x7b09c42e4c20>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7b09c42e4c20>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7b09e41e3e00>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7b09e41e3e00>}).
I0423 08:37:33.854329 135368962934592 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34
I0423 08:37:33.854399 135368962934592 async_checkpointer.py:192] [process=6][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7b09c4535800> timeout: 1200 secs and primary_host=0 for async checkpoint writes
I0423 08:37:35.494470 135368962934592 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_16_zarr3_true/checkpoints
I0423 08:37:35.716478 135368962934592 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_20260423_071538/linen_xpk_main_20260423_071538_16_zarr3_true/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7b09e427d2e0>
I0423 08:37:35.716654 135368962934592 checkpointing.py:301] Checkpoint manager created!
I0423 08:37:36.649889 135368962934592 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0423 08:37:36.650009 135368962934592 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0423 08:37:37.033569 135368962934592 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch_attn', 'activation_length_attn', 'activation_embed_attn').
I0423 08:37:37.033679 135368962934592 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0423 08:37:37.050327 135368962934592 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch_attn', 'activation_length_attn', 'activation_embed_attn').
I0423 08:37:37.050393 135368962934592 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0423 08:37:37.074406 135368962934592 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_length_attn', 'activation_kv_heads', 'activation_kv_head_dim').
I0423 08:37:37.074483 135368962934592 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0423 08:37:37.091107 135368962934592 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_length_attn', 'activation_kv_heads', 'activation_kv_head_dim').
I0423 08:37:37.091172 135368962934592 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0423 08:37:37.107553 135368962934592 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_length_attn', 'activation_kv_heads', 'activation_kv_head_dim').
I0423 08:37:37.107616 135368962934592 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0423 08:37:37.132596 135368962934592 attentions.py:1198] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch_attn', 'activation_length_attn', 'activation_heads', 'activation_kv').
I0423 08:37:37.132672 135368962934592 attentions.py:1198] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0423 08:37:37.153937 135368962934592 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0423 08:37:37.154010 135368962934592 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0423 08:37:37.364036 135368962934592 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint
I0423 08:37:37.364166 135368962934592 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0423 08:37:38.794706 135368962934592 maxtext_utils.py:1707]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   P('norm',)
    Physical:  (None,)
I0423 08:37:38.794836 135368962934592 maxtext_utils.py:1707]  params/params/decoder/layers/mlp/wi_0/kernel
    Shape:     float32[2048,16,7168]
    Logical:   P('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0423 08:37:38.794895 135368962934592 maxtext_utils.py:1707]  params/params/decoder/layers/mlp/wi_1/kernel
    Shape:     float32[2048,16,7168]
    Logical:   P('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0423 08:37:38.794955 135368962934592 maxtext_utils.py:1707]  params/params/decoder/layers/mlp/wo/kernel
    Shape:     float32[7168,16,2048]
    Logical:   P('mlp', 'layers', 'embed')
    Physical:  (None, None, 'fsdp')
I0423 08:37:38.795007 135368962934592 maxtext_utils.py:1707]  params/params/decoder/layers/post_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   P('norm', 'layers')
    Physical:  (None, None)
I0423 08:37:38.795045 135368962934592 maxtext_utils.py:1707]  params/params/decoder/layers/pre_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   P('norm', 'layers')
    Physical:  (None, None)
I0423 08:37:38.795109 135368962934592 maxtext_utils.py:1707]  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)
I0423 08:37:38.795166 135368962934592 maxtext_utils.py:1707]  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')
I0423 08:37:38.795206 135368962934592 maxtext_utils.py:1707]  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)
I0423 08:37:38.795517 135368962934592 maxtext_utils.py:1707]  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)
I0423 08:37:38.795694 135368962934592 maxtext_utils.py:1707]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   P('embed_vocab', 'vocab')
    Physical:  ('fsdp', None)

I0423 08:37:38.795769 135368962934592 maxtext_utils.py:1707]  params/params/token_embedder/embedding
    Shape:     float32[32000,2048]
    Logical:   P('vocab', 'embed_vocab')
    Physical:  (None, 'fsdp')
I0423 08:37:39.291082 135368962934592 train.py:155] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0423 08:37:39.291186 135368962934592 train.py:155] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0423 08:37:39.306747 135368962934592 train.py:162] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0423 08:37:39.306805 135368962934592 train.py:162] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0423 08:37:50.182554 135368962934592 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.
I0423 08:37:50.183390 135368962934592 metric_logger.py:301] number parameters: 1.104 billion
I0423 08:38:01.543410 135368962934592 checkpointing.py:772] Waiting for step 0 to finish before checkpoint...
I0423 08:38:01.804739 135368962934592 checkpointing.py:776] Waited 0.26131272315979004 seconds for step 0 to finish before starting checkpointing.
I0423 08:38:01.806924 135368962934592 checkpoint_manager.py:2009] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0423 08:38:01.808710 135368962934592 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 0
I0423 08:38:01.810072 135368962934592 event_tracking.py:70] [process=6] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_16_zarr3_true/checkpoints/0.
I0423 08:38:02.581786 135368962934592 signaling_client.py:364] Using JaxDistributedSignalingClient
I0423 08:38:02.582688 135368962934592 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0423 08:38:02.582743 135368962934592 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
I0423 08:38:02.863920 135368962934592 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.282207s
I0423 08:38:02.864106 135368962934592 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 5.357 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.28795337677001953 s) (per-host)
I0423 08:38:02.864159 135368962934592 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.288029s (batch_requests_ready=0.002599s, total_serialization_initiated=0.285347s, others=0.000083s)
I0423 08:38:02.864248 135368962934592 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.292202s (all_items=0.000019s, per_item={'items': '0.00001884'}, temp_paths=0.292183)
I0423 08:38:02.865057 135368962934592 event_tracking.py:125] [process=6] [async] Finished blocking save in 1.06 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_16_zarr3_true/checkpoints/0.
I0423 08:38:02.865437 135243285657344 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-23 08:58:02.865400
I0423 08:38:02.867431 135368962934592 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0423 08:38:02.867744 135243235301120 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save.
I0423 08:38:02.867872 135368962934592 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_16_zarr3_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776933481.8069065, 'wait_for_prev_duration_secs': 6.0558319091796875e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776933481.8087475, 'checkpointer_blocking_duration_secs': 1.0568439960479736, 'get_old_steps_start_time': 1776933482.8656182, 'get_old_steps_duration_secs': 2.9325485229492188e-05, 'checkpoint_manager_blocking_start_time': 1776933481.8052402, 'checkpoint_manager_blocking_duration_secs': 1.0625941753387451}
I0423 08:38:02.868029 135368962934592 checkpointing.py:408] Started an asynchronous checkpoint save for step 0
I0423 08:38:02.868078 135368962934592 max_utils.py:750] 
Memstats: After params initialized:
I0423 08:38:02.868138 135368962934592 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_24(process=6,(0,6,0,0))
I0423 08:38:02.868171 135368962934592 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_25(process=6,(1,6,0,0))
I0423 08:38:02.868198 135368962934592 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_28(process=6,(0,7,0,0))
I0423 08:38:02.868224 135368962934592 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_29(process=6,(1,7,0,0))
I0423 08:38:03.188740 135368962934592 metric_logger.py:196] completed step: 0, seconds: 11.360, TFLOP/s/device: 1.196, Tokens/s/device: 180.284, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0423 08:38:03.363563 135368962934592 metric_logger.py:196] completed step: 1, seconds: 1.644, TFLOP/s/device: 8.265, Tokens/s/device: 1245.864, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0423 08:38:03.795979 135368962934592 metric_logger.py:196] completed step: 2, seconds: 0.028, TFLOP/s/device: 490.989, Tokens/s/device: 74007.155, total_weights: 65536, loss: 10.560, lm_loss: 10.560, perplexity: 38547.719
I0423 08:38:03.943283 135368962934592 metric_logger.py:196] completed step: 3, seconds: 0.433, TFLOP/s/device: 31.410, Tokens/s/device: 4734.428, total_weights: 65536, loss: 9.980, lm_loss: 9.980, perplexity: 21590.506
I0423 08:38:03.947756 135368962934592 checkpointing.py:772] Waiting for step 5 to finish before checkpoint...
I0423 08:38:04.237398 135368962934592 checkpointing.py:776] Waited 0.2896089553833008 seconds for step 5 to finish before starting checkpointing.
I0423 08:38:04.240462 135368962934592 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0423 08:38:06.292193    2764 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0423 08:38:08.677573 135243243693824 array_metadata_store.py:203] [process=6][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_16_zarr3_true/checkpoints/0/items/array_metadatas/process_6
I0423 08:38:39.717530 135243285657344 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 42.529 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 37.14133286476135 s) (per-host)
I0423 08:38:39.717651 135243285657344 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 36.852103s.
I0423 08:38:49.883186 135243285657344 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 47.017623s.
I0423 08:38:49.883486 135243235301120 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save.
I0423 08:38:49.883630 135243235301120 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save.
I0423 08:38:49.883693 135243235301120 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0423 08:38:49.885507 135243235301120 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0423 08:38:49.885681 135368962934592 checkpoint_manager.py:2032] [process=6][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0.
W0423 08:38:49.885813 135368962934592 checkpoint_manager.py:1452] Waiting for previous save to complete took 45.645351 seconds. If this number is high, consider checkpointing less frequently.
I0423 08:38:49.887979 135368962934592 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 5
I0423 08:38:49.890556 135368962934592 event_tracking.py:70] [process=6] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_16_zarr3_true/checkpoints/5.
I0423 08:38:50.190853 135368962934592 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0423 08:38:50.190948 135368962934592 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
I0423 08:38:50.228307 135368962934592 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.038539s
I0423 08:38:50.228482 135368962934592 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 36.691 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.042041778564453125 s) (per-host)
I0423 08:38:50.228533 135368962934592 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.042102s (batch_requests_ready=0.001857s, total_serialization_initiated=0.040178s, others=0.000067s)
I0423 08:38:50.228623 135368962934592 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.047108s (all_items=0.000015s, per_item={'items': '0.00001454'}, temp_paths=0.047093)
I0423 08:38:50.229284 135368962934592 event_tracking.py:125] [process=6] [async] Finished blocking save in 0.34 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_16_zarr3_true/checkpoints/5.
I0423 08:38:50.229536 135243243693824 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-23 08:58:50.229516
I0423 08:38:50.245387 135368962934592 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=5] Starting CheckpointManager Save Finalize thread=save_finalize
I0423 08:38:50.245660 135243235301120 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save.
I0423 08:38:50.245820 135368962934592 standard_logger.py:34] {'step': 5, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_16_zarr3_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776933484.2404325, 'wait_for_prev_duration_secs': 45.64535140991211, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776933529.8880181, 'checkpointer_blocking_duration_secs': 0.34160709381103516, 'get_old_steps_start_time': 1776933530.2296457, 'get_old_steps_duration_secs': 2.765655517578125e-05, 'checkpoint_manager_blocking_start_time': 1776933484.238017, 'checkpoint_manager_blocking_duration_secs': 46.007768869400024}
I0423 08:38:50.245934 135368962934592 checkpointing.py:408] Started an asynchronous checkpoint save for step 5
I0423 08:38:50.246734 135368962934592 metric_logger.py:196] completed step: 4, seconds: 0.153, TFLOP/s/device: 88.878, Tokens/s/device: 13396.653, total_weights: 65536, loss: 9.460, lm_loss: 9.460, perplexity: 12840.355
I0423 08:38:50.252558 135368962934592 metric_logger.py:196] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.246, Tokens/s/device: 13904.259, total_weights: 65536, loss: 8.959, lm_loss: 8.959, perplexity: 7776.467
I0423 08:38:55.831786 135221366171392 array_metadata_store.py:203] [process=6][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_16_zarr3_true/checkpoints/5/items/array_metadatas/process_6
I0423 08:39:12.676117 135368962934592 metric_logger.py:196] completed step: 6, seconds: 46.303, TFLOP/s/device: 0.293, Tokens/s/device: 44.230, total_weights: 65536, loss: 8.469, lm_loss: 8.469, perplexity: 4762.740
I0423 08:39:12.823347 135368962934592 metric_logger.py:196] completed step: 7, seconds: 22.277, TFLOP/s/device: 0.610, Tokens/s/device: 91.932, total_weights: 65536, loss: 8.003, lm_loss: 8.003, perplexity: 2989.151
I0423 08:39:12.970734 135368962934592 metric_logger.py:196] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.309, Tokens/s/device: 13461.551, total_weights: 65536, loss: 7.572, lm_loss: 7.572, perplexity: 1943.098
I0423 08:39:13.117765 135368962934592 checkpointing.py:772] Waiting for step 9 to finish before checkpoint...
I0423 08:39:13.118415 135368962934592 checkpointing.py:776] Waited 0.00067138671875 seconds for step 9 to finish before starting checkpointing.
I0423 08:39:13.120330 135368962934592 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=5][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0423 08:39:33.423714 135243243693824 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 36.533 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 43.237234354019165 s) (per-host)
I0423 08:39:33.423840 135243243693824 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 43.194236s.
I0423 08:39:41.145125 135243243693824 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 50.915479s.
I0423 08:39:41.145412 135243235301120 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save.
I0423 08:39:41.145539 135243235301120 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save.
I0423 08:39:41.145587 135243235301120 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=5] CheckpointManager Save Finalize is syncing with other hosts...
I0423 08:39:41.147131 135243235301120 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=5] CheckpointManager Save Finalize is done on all hosts.
I0423 08:39:41.147304 135368962934592 checkpoint_manager.py:2032] [process=6][thread=MainThread][step=5][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=5.
W0423 08:39:41.147433 135368962934592 checkpoint_manager.py:1452] Waiting for previous save to complete took 28.027107 seconds. If this number is high, consider checkpointing less frequently.
I0423 08:39:41.151378 135368962934592 checkpoint_manager.py:1512] [process=6] Saving checkpoint at step 9
I0423 08:39:41.153325 135368962934592 event_tracking.py:70] [process=6] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_16_zarr3_true/checkpoints/9.
I0423 08:39:41.454108 135368962934592 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0423 08:39:41.454200 135368962934592 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
I0423 08:39:41.487798 135368962934592 base_pytree_checkpoint_handler.py:154] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.034488s
I0423 08:39:41.487969 135368962934592 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/blocking_gbytes_per_sec: 40.528 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.038062334060668945 s) (per-host)
I0423 08:39:41.488018 135368962934592 base_pytree_checkpoint_handler.py:768] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.038121s (batch_requests_ready=0.001739s, total_serialization_initiated=0.036318s, others=0.000064s)
I0423 08:39:41.488124 135368962934592 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.042347s (all_items=0.000012s, per_item={'items': '0.00001216'}, temp_paths=0.042335)
I0423 08:39:41.488759 135368962934592 event_tracking.py:125] [process=6] [async] Finished blocking save in 0.34 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_16_zarr3_true/checkpoints/9.
I0423 08:39:41.489092 135243235301120 async_checkpointer.py:76] [process=6][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-23 08:59:41.489042
I0423 08:39:41.492862 135368962934592 checkpoint_manager.py:1560] [process=6][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0423 08:39:41.493139 135241129780992 async_checkpointer.py:280] [process=6][thread=save_finalize] Waiting for background save thread=async_save.
I0423 08:39:41.493296 135368962934592 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_16_zarr3_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776933553.1202993, 'wait_for_prev_duration_secs': 28.027106523513794, 'time_between_consecutive_saves_sec': 23.23474907875061, 'checkpointer_blocking_start_time': 1776933581.1514218, 'checkpointer_blocking_duration_secs': 0.3378334045410156, 'get_old_steps_start_time': 1776933581.489271, 'get_old_steps_duration_secs': 2.47955322265625e-05, 'checkpoint_manager_blocking_start_time': 1776933553.1186552, 'checkpoint_manager_blocking_duration_secs': 28.37460994720459}
I0423 08:39:41.493405 135368962934592 checkpointing.py:408] Started an asynchronous checkpoint save for step 9
I0423 08:39:41.493448 135368962934592 checkpoint_manager.py:2020] [process=6][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0423 08:39:46.950294 135221366171392 array_metadata_store.py:203] [process=6][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_16_zarr3_true/checkpoints/9/items/array_metadatas/process_6
I0423 08:40:23.403280 135243235301120 base_pytree_checkpoint_handler.py:130] [process=6] /jax/orbax/write/gbytes_per_sec: 37.651 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 41.95333290100098 s) (per-host)
I0423 08:40:23.403383 135243235301120 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.914159s.
I0423 08:40:30.514263 135243235301120 async_checkpointer.py:160] [process=6][thread=async_save] Background save thread done. Time taken: 49.025023s.
I0423 08:40:30.514549 135241129780992 async_checkpointer.py:288] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save.
I0423 08:40:30.514668 135241129780992 async_checkpointer.py:298] [process=6][thread=save_finalize] No errors found in background save thread=async_save.
I0423 08:40:30.514711 135241129780992 checkpoint_manager.py:2137] [process=6][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0423 08:40:30.516186 135241129780992 checkpoint_manager.py:2146] [process=6][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0423 08:40:30.516354 135368962934592 checkpoint_manager.py:2032] [process=6][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9.
I0423 08:40:30.516503 135368962934592 checkpoint_manager.py:2009] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0423 08:40:30.517484 135368962934592 metric_logger.py:196] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.172, Tokens/s/device: 13893.129, total_weights: 65536, loss: 7.181, lm_loss: 7.181, perplexity: 1314.495
Per train step:
 Total TFLOPs: 13.59 
 split as 93.93% learnable weight flops and 6.07% attention flops
XPK End: Thu Apr 23 08:40:39 UTC 2026
EXIT_CODE=0
feat/nnx-set-defaults-true  ·  73213e044  ·  feat_nnx_set_defaults_true_20260423_155242  ·  full log 
XPK Start: Thu Apr 23 17:12:51 UTC 2026
2026-04-23 17:12:55.610145: E external/local_xla/xla/stream_executor/cuda/cuda_fft.cc:467] Unable to register cuFFT factory: Attempting to register factory for plugin cuFFT when one has already been registered
WARNING: All log messages before absl::InitializeLog() is called are written to STDERR
E0000 00:00:1776964375.623303      10 cuda_dnn.cc:8579] Unable to register cuDNN factory: Attempting to register factory for plugin cuDNN when one has already been registered
E0000 00:00:1776964375.627057      10 cuda_blas.cc:1407] Unable to register cuBLAS factory: Attempting to register factory for plugin cuBLAS when one has already been registered
W0000 00:00:1776964375.638814      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776964375.638838      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776964375.638841      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776964375.638843      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
2026-04-23 17:13:14.918537: 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)
I0423 17:13:15.444632 140303496460096 max_utils.py:273] Attempting to initialize the jax distributed system...
INFO:2026-04-23 17:13:24,486:jax._src.distributed:140: Starting JAX distributed service on [::]:8482
I0423 17:13:24.486317 140303496460096 distributed.py:140] Starting JAX distributed service on [::]:8482
INFO:2026-04-23 17:13:24,488:jax._src.distributed:157: Connecting to JAX distributed service on mt-16-zarr3-true-sv-gny02-slice-job-0-0.mt-16-zarr3-true-sv-gny02:8482
I0423 17:13:24.488676 140303496460096 distributed.py:157] Connecting to JAX distributed service on mt-16-zarr3-true-sv-gny02-slice-job-0-0.mt-16-zarr3-true-sv-gny02:8482
I0423 17:13:25.291562 140303496460096 max_utils.py:284] Jax distributed system initialized!
I0423 17:13:31.355765 140303496460096 max_utils.py:800] System Information: Jax Version: 0.8.1
I0423 17:13:31.355890 140303496460096 max_utils.py:801] System Information: Jaxlib Version: 0.8.1
I0423 17:13:31.355937 140303496460096 max_utils.py:802] System Information: Jax Backend: PJRT C API
TFRT TPU v6 lite
Built on Nov 12 2025 14:16:36 (1762985796) cl/831091709
I0423 17:13:31.355981 140303496460096 train_utils.py:377] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0423 17:13:31.982886 140303496460096 maxtext_utils.py:1631] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0423 17:13:31.983573 140303496460096 maxtext_utils.py:1631] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0423 17:13:31.983771 140303496460096 checkpointing.py:688] Setting up checkpoint logger...
I0423 17:13:31.983825 140303496460096 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True
I0423 17:13:31.983868 140303496460096 pytree_checkpoint_handler.py:589] save_device_host_concurrent_bytes=None
I0423 17:13:31.984268 140303496460096 base_pytree_checkpoint_handler.py:415] Created BasePyTreeCheckpointHandler: use_ocdbt=True, use_zarr3=True, pytree_metadata_options=PyTreeMetadataOptions(support_rich_types=False), array_metadata_store=<orbax.checkpoint._src.metadata.array_metadata_store.Store object at 0x7f9a7eb78f80>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0423 17:13:34.899785 140303496460096 checkpointing.py:266] Enabling policy for fixed interval checkpointing.
I0423 17:13:34.900024 140303496460096 checkpoint_manager.py:709] [process=6][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7f878058e540>}, handler_registry=None
I0423 17:13:34.900280 140303496460096 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7f878058e540>` 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`.
I0423 17:13:34.900332 140303496460096 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7f87803dcfb0>` 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`.
I0423 17:13:34.900371 140303496460096 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 0x7f878058e540>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7f878058e540>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7f87803dcfb0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7f87803dcfb0>}).
I0423 17:13:34.900876 140303496460096 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.33
I0423 17:13:34.900954 140303496460096 async_checkpointer.py:177] [process=6][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7f86980f0180> timeout: 600 secs and primary_host=0 for async checkpoint writes
I0423 17:13:36.052515 140303496460096 checkpoint_manager.py:1818] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260423_155242/linen_xpk_feat_nnx_set_defaults_true_20260423_155242_16_zarr3_true/checkpoints
I0423 17:13:36.127157 140303496460096 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_feat_nnx_set_defaults_true_20260423_155242/linen_xpk_feat_nnx_set_defaults_true_20260423_155242_16_zarr3_true/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7f878027a1e0>
I0423 17:13:36.127336 140303496460096 checkpointing.py:302] Checkpoint manager created!
I0423 17:13:37.030436 140303496460096 nnx_wrappers.py:455] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0423 17:13:37.030543 140303496460096 nnx_wrappers.py:455] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0423 17:13:37.399408 140303496460096 attentions.py:1084] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0423 17:13:37.399504 140303496460096 attentions.py:1084] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0423 17:13:37.415325 140303496460096 attentions.py:1085] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0423 17:13:37.415387 140303496460096 attentions.py:1085] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0423 17:13:37.438322 140303496460096 attentions.py:1150] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0423 17:13:37.438390 140303496460096 attentions.py:1150] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0423 17:13:37.454370 140303496460096 attentions.py:1151] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0423 17:13:37.454434 140303496460096 attentions.py:1151] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0423 17:13:37.470262 140303496460096 attentions.py:1152] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0423 17:13:37.470330 140303496460096 attentions.py:1152] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0423 17:13:37.495048 140303496460096 attentions.py:1193] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0423 17:13:37.495135 140303496460096 attentions.py:1193] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0423 17:13:37.514853 140303496460096 linears.py:541] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0423 17:13:37.514921 140303496460096 linears.py:541] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0423 17:13:37.704958 140303496460096 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint
I0423 17:13:37.705070 140303496460096 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0423 17:13:39.150211 140303496460096 maxtext_utils.py:1740]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   PartitionSpec('norm',)
    Physical:  (None,)
I0423 17:13:39.150343 140303496460096 maxtext_utils.py:1740]  params/params/decoder/layers/mlp/wi_0/kernel
    Shape:     float32[2048,16,7168]
    Logical:   PartitionSpec('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0423 17:13:39.150400 140303496460096 maxtext_utils.py:1740]  params/params/decoder/layers/mlp/wi_1/kernel
    Shape:     float32[2048,16,7168]
    Logical:   PartitionSpec('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0423 17:13:39.150462 140303496460096 maxtext_utils.py:1740]  params/params/decoder/layers/mlp/wo/kernel
    Shape:     float32[7168,16,2048]
    Logical:   PartitionSpec('mlp', 'layers', 'embed')
    Physical:  (None, None, 'fsdp')
I0423 17:13:39.150523 140303496460096 maxtext_utils.py:1740]  params/params/decoder/layers/post_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   PartitionSpec('norm', 'layers')
    Physical:  (None, None)
I0423 17:13:39.150566 140303496460096 maxtext_utils.py:1740]  params/params/decoder/layers/pre_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   PartitionSpec('norm', 'layers')
    Physical:  (None, None)
I0423 17:13:39.150619 140303496460096 maxtext_utils.py:1740]  params/params/decoder/layers/self_attention/key/kernel
    Shape:     float32[2048,16,16,128]
    Logical:   PartitionSpec('embed', 'layers', 'kv_heads', 'kv_head_dim')
    Physical:  ('fsdp', None, None, None)
I0423 17:13:39.150673 140303496460096 maxtext_utils.py:1740]  params/params/decoder/layers/self_attention/out/kernel
    Shape:     float32[16,16,128,2048]
    Logical:   PartitionSpec('heads', 'layers', 'kv', 'embed')
    Physical:  (None, None, None, 'fsdp')
I0423 17:13:39.150715 140303496460096 maxtext_utils.py:1740]  params/params/decoder/layers/self_attention/query/kernel
    Shape:     float32[2048,16,16,128]
    Logical:   PartitionSpec('embed', 'layers', 'q_heads', 'kv')
    Physical:  ('fsdp', None, None, None)
I0423 17:13:39.150752 140303496460096 maxtext_utils.py:1740]  params/params/decoder/layers/self_attention/value/kernel
    Shape:     float32[2048,16,16,128]
    Logical:   PartitionSpec('embed', 'layers', 'kv_heads', 'kv_head_dim')
    Physical:  ('fsdp', None, None, None)
I0423 17:13:39.150801 140303496460096 maxtext_utils.py:1740]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   PartitionSpec('embed', 'vocab')
    Physical:  ('fsdp', None)
I0423 17:13:39.150851 140303496460096 maxtext_utils.py:1740]  params/params/token_embedder/embedding
    Shape:     float32[32000,2048]

    Logical:   PartitionSpec('vocab', 'embed')
    Physical:  (None, 'fsdp')
I0423 17:13:39.657450 140303496460096 train.py:158] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0423 17:13:39.657546 140303496460096 train.py:158] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0423 17:13:39.672626 140303496460096 train.py:165] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0423 17:13:39.672689 140303496460096 train.py:165] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0423 17:13:50.557568 140303496460096 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.
I0423 17:13:50.558373 140303496460096 metric_logger.py:289] number parameters: 1.104 billion
I0423 17:14:01.792665 140303496460096 checkpointing.py:794] Waiting for step 0 to finish before checkpoint...
I0423 17:14:01.945978 140303496460096 checkpointing.py:798] Waited 0.15329408645629883 seconds for step 0 to finish before starting checkpointing.
I0423 17:14:01.948329 140303496460096 checkpoint_manager.py:2013] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0423 17:14:01.949929 140303496460096 checkpoint_manager.py:1518] [process=6] Saving checkpoint at step 0
I0423 17:14:01.952785 140303496460096 async_checkpointer.py:452] [process=6] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260423_155242/linen_xpk_feat_nnx_set_defaults_true_20260423_155242_16_zarr3_true/checkpoints/0.
I0423 17:14:02.505811 140303496460096 signaling_client.py:364] Using JaxDistributedSignalingClient
I0423 17:14:02.507034 140303496460096 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0423 17:14:02.507090 140303496460096 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
I0423 17:14:02.757530 140303496460096 base_pytree_checkpoint_handler.py:153] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.251790s
I0423 17:14:02.757700 140303496460096 base_pytree_checkpoint_handler.py:129] [process=6] /jax/checkpoint/write/blocking_gbytes_per_sec: 3.041 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.5072784423828125 s) (per-host)
I0423 17:14:02.757751 140303496460096 base_pytree_checkpoint_handler.py:737] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.507340s (batch_requests_ready=0.251924s, total_serialization_initiated=0.255346s, others=0.000070s)
I0423 17:14:02.757837 140303496460096 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.511412s (all_items=0.000019s, per_item={'items': '0.00001884'}, temp_paths=0.511393)
I0423 17:14:02.758798 140181382342400 async_checkpointer.py:79] [process=6][thread=async_save] Background save thread started.
I0423 17:14:02.758970 140303496460096 async_checkpointer.py:561] Finished blocking save. Time taken: 0.808969s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260423_155242/linen_xpk_feat_nnx_set_defaults_true_20260423_155242_16_zarr3_true/checkpoints/0.
I0423 17:14:03.218706 140303496460096 checkpoint_manager.py:1566] [process=6][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0423 17:14:03.219082 140179260036864 async_checkpointer.py:265] [process=6][thread=save_finalize] Waiting for background save thread=async_save.
I0423 17:14:03.219279 140303496460096 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260423_155242/linen_xpk_feat_nnx_set_defaults_true_20260423_155242_16_zarr3_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776964441.9483116, 'wait_for_prev_duration_secs': 6.198883056640625e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776964441.949968, 'checkpointer_blocking_duration_secs': 0.8091075420379639, 'get_old_steps_start_time': 1776964442.759115, 'get_old_steps_duration_secs': 2.5510787963867188e-05, 'checkpoint_manager_blocking_start_time': 1776964441.9465625, 'checkpoint_manager_blocking_duration_secs': 1.272674560546875}
I0423 17:14:03.219394 140303496460096 checkpointing.py:409] Started an asynchronous checkpoint save for step 0
I0423 17:14:03.219449 140303496460096 max_utils.py:750] 
Memstats: After params initialized:
I0423 17:14:03.219506 140303496460096 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_24(process=6,(0,6,0,0))
I0423 17:14:03.219539 140303496460096 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_25(process=6,(1,6,0,0))
I0423 17:14:03.219565 140303496460096 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_28(process=6,(0,7,0,0))
I0423 17:14:03.219590 140303496460096 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_29(process=6,(1,7,0,0))
I0423 17:14:03.482595 140303496460096 metric_logger.py:185] completed step: 0, seconds: 11.234, TFLOP/s/device: 1.209, Tokens/s/device: 182.301, total_weights: 65536, loss: 10.874
I0423 17:14:03.672878 140303496460096 metric_logger.py:185] completed step: 1, seconds: 1.689, TFLOP/s/device: 8.046, Tokens/s/device: 1212.782, total_weights: 65536, loss: 10.874
I0423 17:14:04.118808 140303496460096 metric_logger.py:185] completed step: 2, seconds: 0.043, TFLOP/s/device: 316.274, Tokens/s/device: 47672.253, total_weights: 65536, loss: 10.560
I0423 17:14:04.266196 140303496460096 metric_logger.py:185] completed step: 3, seconds: 0.446, TFLOP/s/device: 30.463, Tokens/s/device: 4591.722, total_weights: 65536, loss: 9.980
I0423 17:14:04.270785 140303496460096 checkpointing.py:794] Waiting for step 5 to finish before checkpoint...
I0423 17:14:04.561068 140303496460096 checkpointing.py:798] Waited 0.29024624824523926 seconds for step 5 to finish before starting checkpointing.
I0423 17:14:04.563992 140303496460096 checkpoint_manager.py:2024] [process=6][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0423 17:14:05.542609    2559 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0423 17:14:07.517434 140181390735104 array_metadata_store.py:203] [process=6][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260423_155242/linen_xpk_feat_nnx_set_defaults_true_20260423_155242_16_zarr3_true/checkpoints/0/items/array_metadatas/process_6
I0423 17:14:39.288806 140181382342400 base_pytree_checkpoint_handler.py:129] [process=6] /jax/checkpoint/write/gbytes_per_sec: 42.648 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 37.03833532333374 s) (per-host)
I0423 17:14:39.288934 140181382342400 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 36.530025s.
I0423 17:14:47.486664 140181382342400 async_checkpointer.py:144] [process=6][thread=async_save] Background save thread done. Time taken: 44.727740s.
I0423 17:14:47.486930 140179260036864 async_checkpointer.py:273] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save.
I0423 17:14:47.487005 140179260036864 async_checkpointer.py:283] [process=6][thread=save_finalize] No errors found in background save thread=async_save.
I0423 17:14:47.487050 140179260036864 checkpoint_manager.py:2133] [process=6][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0423 17:14:47.488739 140179260036864 checkpoint_manager.py:2142] [process=6][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0423 17:14:47.488891 140303496460096 checkpoint_manager.py:2036] [process=6][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0.
W0423 17:14:47.489058 140303496460096 checkpoint_manager.py:1458] Waiting for previous save to complete took 42.925066 seconds. If this number is high, consider checkpointing less frequently.
I0423 17:14:47.490957 140303496460096 checkpoint_manager.py:1518] [process=6] Saving checkpoint at step 5
I0423 17:14:47.495033 140303496460096 async_checkpointer.py:452] [process=6] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260423_155242/linen_xpk_feat_nnx_set_defaults_true_20260423_155242_16_zarr3_true/checkpoints/5.
I0423 17:14:48.074850 140303496460096 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0423 17:14:48.074949 140303496460096 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
I0423 17:14:48.118368 140303496460096 base_pytree_checkpoint_handler.py:153] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.045363s
I0423 17:14:48.118528 140303496460096 base_pytree_checkpoint_handler.py:129] [process=6] /jax/checkpoint/write/blocking_gbytes_per_sec: 5.051 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.30539488792419434 s) (per-host)
I0423 17:14:48.118577 140303496460096 base_pytree_checkpoint_handler.py:737] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.305452s (batch_requests_ready=0.258262s, total_serialization_initiated=0.047127s, others=0.000063s)
I0423 17:14:48.118667 140303496460096 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.310267s (all_items=0.000015s, per_item={'items': '0.00001550'}, temp_paths=0.310252)
I0423 17:14:48.119575 140180292691712 async_checkpointer.py:79] [process=6][thread=async_save] Background save thread started.
I0423 17:14:48.119746 140303496460096 async_checkpointer.py:561] Finished blocking save. Time taken: 0.628717s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260423_155242/linen_xpk_feat_nnx_set_defaults_true_20260423_155242_16_zarr3_true/checkpoints/5.
I0423 17:14:48.135372 140303496460096 checkpoint_manager.py:1566] [process=6][thread=MainThread][step=5] Starting CheckpointManager Save Finalize thread=save_finalize
I0423 17:14:48.135681 140179260036864 async_checkpointer.py:265] [process=6][thread=save_finalize] Waiting for background save thread=async_save.
I0423 17:14:48.135841 140303496460096 standard_logger.py:34] {'step': 5, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260423_155242/linen_xpk_feat_nnx_set_defaults_true_20260423_155242_16_zarr3_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776964444.563964, 'wait_for_prev_duration_secs': 42.925065994262695, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776964487.490996, 'checkpointer_blocking_duration_secs': 0.6288621425628662, 'get_old_steps_start_time': 1776964488.1198776, 'get_old_steps_duration_secs': 2.5033950805664062e-05, 'checkpoint_manager_blocking_start_time': 1776964444.561716, 'checkpoint_manager_blocking_duration_secs': 43.574090242385864}
I0423 17:14:48.135947 140303496460096 checkpointing.py:409] Started an asynchronous checkpoint save for step 5
I0423 17:14:48.136529 140303496460096 metric_logger.py:185] completed step: 4, seconds: 0.153, TFLOP/s/device: 88.719, Tokens/s/device: 13372.685, total_weights: 65536, loss: 9.460
I0423 17:14:48.142168 140303496460096 metric_logger.py:185] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.300, Tokens/s/device: 13912.476, total_weights: 65536, loss: 8.959
I0423 17:15:07.468442 140303496460096 metric_logger.py:185] completed step: 6, seconds: 43.870, TFLOP/s/device: 0.310, Tokens/s/device: 46.683, total_weights: 65536, loss: 8.469
I0423 17:15:07.615840 140303496460096 metric_logger.py:185] completed step: 7, seconds: 19.180, TFLOP/s/device: 0.708, Tokens/s/device: 106.777, total_weights: 65536, loss: 8.003
I0423 17:15:07.763260 140303496460096 metric_logger.py:185] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.319, Tokens/s/device: 13463.144, total_weights: 65536, loss: 7.572
I0423 17:15:07.910347 140303496460096 checkpointing.py:794] Waiting for step 9 to finish before checkpoint...
I0423 17:15:07.910983 140303496460096 checkpointing.py:798] Waited 0.0006575584411621094 seconds for step 9 to finish before starting checkpointing.
I0423 17:15:07.913065 140303496460096 checkpoint_manager.py:2024] [process=6][thread=MainThread][step=5][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0423 17:15:11.966878 140181390735104 array_metadata_store.py:203] [process=6][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260423_155242/linen_xpk_feat_nnx_set_defaults_true_20260423_155242_16_zarr3_true/checkpoints/5/items/array_metadatas/process_6
I0423 17:15:48.573194 140180292691712 base_pytree_checkpoint_handler.py:129] [process=6] /jax/checkpoint/write/gbytes_per_sec: 25.997 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 60.76002621650696 s) (per-host)
I0423 17:15:48.573300 140180292691712 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 60.453612s.
I0423 17:15:58.104752 140180292691712 async_checkpointer.py:144] [process=6][thread=async_save] Background save thread done. Time taken: 69.985048s.
I0423 17:15:58.105047 140179260036864 async_checkpointer.py:273] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save.
I0423 17:15:58.105206 140179260036864 async_checkpointer.py:283] [process=6][thread=save_finalize] No errors found in background save thread=async_save.
I0423 17:15:58.105257 140179260036864 checkpoint_manager.py:2133] [process=6][thread=save_finalize][step=5] CheckpointManager Save Finalize is syncing with other hosts...
I0423 17:15:58.106702 140179260036864 checkpoint_manager.py:2142] [process=6][thread=save_finalize][step=5] CheckpointManager Save Finalize is done on all hosts.
I0423 17:15:58.106872 140303496460096 checkpoint_manager.py:2036] [process=6][thread=MainThread][step=5][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=5.
W0423 17:15:58.107012 140303496460096 checkpoint_manager.py:1458] Waiting for previous save to complete took 50.193959 seconds. If this number is high, consider checkpointing less frequently.
I0423 17:15:58.108572 140303496460096 checkpoint_manager.py:1518] [process=6] Saving checkpoint at step 9
I0423 17:15:58.111927 140303496460096 async_checkpointer.py:452] [process=6] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260423_155242/linen_xpk_feat_nnx_set_defaults_true_20260423_155242_16_zarr3_true/checkpoints/9.
I0423 17:15:59.057835 140303496460096 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0423 17:15:59.057932 140303496460096 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
I0423 17:15:59.101454 140303496460096 base_pytree_checkpoint_handler.py:153] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.044778s
I0423 17:15:59.101619 140303496460096 base_pytree_checkpoint_handler.py:129] [process=6] /jax/checkpoint/write/blocking_gbytes_per_sec: 5.212 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.29596757888793945 s) (per-host)
I0423 17:15:59.101667 140303496460096 base_pytree_checkpoint_handler.py:737] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.296025s (batch_requests_ready=0.249202s, total_serialization_initiated=0.046761s, others=0.000063s)
I0423 17:15:59.101753 140303496460096 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.300180s (all_items=0.000011s, per_item={'items': '0.00001073'}, temp_paths=0.300169)
I0423 17:15:59.102629 140181382342400 async_checkpointer.py:79] [process=6][thread=async_save] Background save thread started.
I0423 17:15:59.102786 140303496460096 async_checkpointer.py:561] Finished blocking save. Time taken: 0.994148s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260423_155242/linen_xpk_feat_nnx_set_defaults_true_20260423_155242_16_zarr3_true/checkpoints/9.
I0423 17:15:59.123354 140303496460096 checkpoint_manager.py:1566] [process=6][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0423 17:15:59.123665 140179260036864 async_checkpointer.py:265] [process=6][thread=save_finalize] Waiting for background save thread=async_save.
I0423 17:15:59.123838 140303496460096 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260423_155242/linen_xpk_feat_nnx_set_defaults_true_20260423_155242_16_zarr3_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776964507.9130373, 'wait_for_prev_duration_secs': 50.19395923614502, 'time_between_consecutive_saves_sec': 20.424258947372437, 'checkpointer_blocking_start_time': 1776964558.108611, 'checkpointer_blocking_duration_secs': 0.9942793846130371, 'get_old_steps_start_time': 1776964559.1029048, 'get_old_steps_duration_secs': 1.9550323486328125e-05, 'checkpoint_manager_blocking_start_time': 1776964507.9112213, 'checkpoint_manager_blocking_duration_secs': 51.21258091926575}
I0423 17:15:59.123947 140303496460096 checkpointing.py:409] Started an asynchronous checkpoint save for step 9
I0423 17:15:59.123991 140303496460096 checkpoint_manager.py:2024] [process=6][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0423 17:16:03.934349 140181390735104 array_metadata_store.py:203] [process=6][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260423_155242/linen_xpk_feat_nnx_set_defaults_true_20260423_155242_16_zarr3_true/checkpoints/9/items/array_metadatas/process_6
I0423 17:16:40.815079 140181382342400 base_pytree_checkpoint_handler.py:129] [process=6] /jax/checkpoint/write/gbytes_per_sec: 37.601 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.00938820838928 s) (per-host)
I0423 17:16:40.815204 140181382342400 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.712462s.
I0423 17:16:47.575646 140181382342400 async_checkpointer.py:144] [process=6][thread=async_save] Background save thread done. Time taken: 48.472868s.
I0423 17:16:47.575932 140179260036864 async_checkpointer.py:273] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save.
I0423 17:16:47.576052 140179260036864 async_checkpointer.py:283] [process=6][thread=save_finalize] No errors found in background save thread=async_save.
I0423 17:16:47.576108 140179260036864 checkpoint_manager.py:2133] [process=6][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0423 17:16:47.578560 140179260036864 checkpoint_manager.py:2142] [process=6][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0423 17:16:47.578718 140303496460096 checkpoint_manager.py:2036] [process=6][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9.
I0423 17:16:47.578865 140303496460096 checkpoint_manager.py:2013] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0423 17:16:47.579467 140303496460096 metric_logger.py:185] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.300, Tokens/s/device: 13912.476, total_weights: 65536, loss: 7.181
Per train step:
 Total TFLOPs: 13.59 
 split as 93.93% learnable weight flops and 6.07% attention flops
XPK End: Thu Apr 23 17:16:57 UTC 2026
EXIT_CODE=0