MaxView

Timing Test Reference Updates
‹ 13_scan_layers_falseCase: 13_scan_layers_true14_async_ckpt_false_resume ›

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 loss8.17908.17900
TFLOP/s92.27692.097-0.179
Tok/s13908.913881.8-27.058
Avg s/step2.7372.379-0.358
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 08:03:39 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 08:04:04.282996: 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 08:04:04.493077 137423608354624 max_utils.py:273] Attempting to initialize the jax distributed system...
I0423 08:04:13.534661 137423608354624 distributed.py:149] Starting JAX distributed service on [::]:8482
I0423 08:04:13.536992 137423608354624 distributed.py:172] Connecting to JAX distributed service on mt-13-scan-layers-true-yt3xr-slice-job-0-0.mt-13-scan-layers-true-yt3xr:8482
I0423 08:04:14.473850 137423608354624 max_utils.py:284] Jax distributed system initialized!
I0423 08:04:20.536100 137423608354624 max_utils.py:800] System Information: Jax Version: 0.9.2
I0423 08:04:20.536205 137423608354624 max_utils.py:801] System Information: Jaxlib Version: 0.9.2
I0423 08:04:20.536244 137423608354624 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 08:04:20.536280 137423608354624 train_utils.py:361] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0423 08:04:21.229243 137423608354624 maxtext_utils.py:1604] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0423 08:04:21.229527 137423608354624 checkpointing.py:677] Setting up checkpoint logger...
I0423 08:04:21.229583 137423608354624 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True
I0423 08:04:21.229627 137423608354624 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None
I0423 08:04:21.229971 137423608354624 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 0x7cfbcc71cec0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0423 08:04:24.244546 137423608354624 checkpointing.py:265] Enabling policy for fixed interval checkpointing.
I0423 08:04:24.244774 137423608354624 checkpoint_manager.py:708] [process=4][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7ce77041f7d0>}, handler_registry=None
I0423 08:04:24.245056 137423608354624 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7ce77041f7d0>` 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 08:04:24.245117 137423608354624 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7ce7700799d0>` 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 08:04:24.245168 137423608354624 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 0x7ce77041f7d0>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7ce77041f7d0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7ce7700799d0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7ce7700799d0>}).
I0423 08:04:24.245521 137423608354624 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34
I0423 08:04:24.245594 137423608354624 async_checkpointer.py:192] [process=4][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7ce758569940> timeout: 1200 secs and primary_host=0 for async checkpoint writes
I0423 08:04:25.824432 137423608354624 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_13_scan_layers_true/checkpoints
I0423 08:04:26.300708 137423608354624 checkpoint_manager.py:929] [process=4][thread=MainThread] CheckpointManager created,  primary_host=0, CheckpointManagerOptions=CheckpointManagerOptions(save_interval_steps=1, max_to_keep=None, keep_time_interval=None, keep_period=None, should_keep_fn=None, best_fn=None, best_mode='max', keep_checkpoints_without_metrics=True, step_prefix=None, step_format_fixed_length=None, step_name_format=None, create=True, cleanup_tmp_directories=False, save_on_steps=frozenset(), single_host_load_and_broadcast=False, todelete_subdir=None, todelete_full_path=None, enable_background_delete=False, read_only=False, enable_async_checkpointing=True, async_options=None, multiprocessing_options=MultiprocessingOptions(primary_host=0, active_processes=None, barrier_sync_key_prefix=None), should_save_fn=None, file_options=FileOptions(path_permission_mode=None), save_root_metadata=True, temporary_path_class=None, save_decision_policy=FixedIntervalPolicy(interval=10), preservation_policy=LatestN(n=None), prevent_write_metrics=False, enable_should_save_is_saving_in_progress_check=True, enable_per_process_directory_creation=False, lightweight_initialize=False), root_directory=gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_13_scan_layers_true/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7ce7700793d0>
I0423 08:04:26.300891 137423608354624 checkpointing.py:301] Checkpoint manager created!
I0423 08:04:27.225021 137423608354624 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0423 08:04:27.225137 137423608354624 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0423 08:04:27.606553 137423608354624 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0423 08:04:27.606652 137423608354624 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0423 08:04:27.623172 137423608354624 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0423 08:04:27.623241 137423608354624 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0423 08:04:27.647033 137423608354624 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0423 08:04:27.647099 137423608354624 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0423 08:04:27.663543 137423608354624 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0423 08:04:27.663610 137423608354624 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0423 08:04:27.680171 137423608354624 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0423 08:04:27.680238 137423608354624 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0423 08:04:27.705260 137423608354624 attentions.py:1198] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0423 08:04:27.705328 137423608354624 attentions.py:1198] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0423 08:04:27.726396 137423608354624 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0423 08:04:27.726460 137423608354624 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0423 08:04:27.944087 137423608354624 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint
I0423 08:04:27.944202 137423608354624 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0423 08:04:29.370011 137423608354624 maxtext_utils.py:1707]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   P('norm',)
    Physical:  (None,)
I0423 08:04:29.370139 137423608354624 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 08:04:29.370196 137423608354624 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 08:04:29.370254 137423608354624 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 08:04:29.370313 137423608354624 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 08:04:29.370354 137423608354624 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 08:04:29.370407 137423608354624 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 08:04:29.370459 137423608354624 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 08:04:29.370498 137423608354624 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 08:04:29.370534 137423608354624 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 08:04:29.370582 137423608354624 maxtext_utils.py:1707]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   P('embed_vocab', 'vocab')
    Physical:  ('fsdp', None)
I0423 08:04:29.370630 137423608354624 maxtext_utils.py:1707]  params/params/token_embedder/embedding
    Shape:     float32[32000,2048]
    Logical:   P('vocab', 'embed_vocab')
    Physical:  (None, 'fsdp')

I0423 08:04:29.864407 137423608354624 train.py:155] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0423 08:04:29.864501 137423608354624 train.py:155] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0423 08:04:29.880373 137423608354624 train.py:162] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0423 08:04:29.880438 137423608354624 train.py:162] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0423 08:04:40.896650 137423608354624 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 08:04:40.897372 137423608354624 metric_logger.py:301] number parameters: 1.104 billion
I0423 08:04:52.146339 137423608354624 checkpointing.py:772] Waiting for step 0 to finish before checkpoint...
I0423 08:04:52.384959 137423608354624 checkpointing.py:776] Waited 0.2386009693145752 seconds for step 0 to finish before starting checkpointing.
I0423 08:04:52.388205 137423608354624 checkpoint_manager.py:2009] [process=4][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0423 08:04:52.389910 137423608354624 checkpoint_manager.py:1512] [process=4] Saving checkpoint at step 0
I0423 08:04:52.391307 137423608354624 event_tracking.py:70] [process=4] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_13_scan_layers_true/checkpoints/0.
I0423 08:04:53.161995 137423608354624 signaling_client.py:364] Using JaxDistributedSignalingClient
I0423 08:04:53.162992 137423608354624 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0423 08:04:53.163048 137423608354624 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 08:04:53.441683 137423608354624 base_pytree_checkpoint_handler.py:154] [process=4][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.279760s
I0423 08:04:53.441858 137423608354624 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/blocking_gbytes_per_sec: 5.405 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2853851318359375 s) (per-host)
I0423 08:04:53.441923 137423608354624 base_pytree_checkpoint_handler.py:768] [process=4][thread=MainThread] Initiated Pytree async_save. Time taken: 0.285460s (batch_requests_ready=0.002492s, total_serialization_initiated=0.282885s, others=0.000083s)
I0423 08:04:53.442014 137423608354624 composite_checkpoint_handler.py:715] [process=4][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.289738s (all_items=0.000018s, per_item={'items': '0.00001836'}, temp_paths=0.289720)
I0423 08:04:53.442794 137423608354624 event_tracking.py:125] [process=4] [async] Finished blocking save in 1.05 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_13_scan_layers_true/checkpoints/0.
I0423 08:04:53.443134 137294828775168 async_checkpointer.py:76] [process=4][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-23 08:24:53.443097
I0423 08:04:53.453892 137423608354624 checkpoint_manager.py:1560] [process=4][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0423 08:04:53.454192 137293243340544 async_checkpointer.py:280] [process=4][thread=save_finalize] Waiting for background save thread=async_save.
I0423 08:04:53.454355 137423608354624 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_13_scan_layers_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776931492.3881865, 'wait_for_prev_duration_secs': 6.103515625e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776931492.3899486, 'checkpointer_blocking_duration_secs': 1.0533549785614014, 'get_old_steps_start_time': 1776931493.443329, 'get_old_steps_duration_secs': 3.0279159545898438e-05, 'checkpoint_manager_blocking_start_time': 1776931492.3854952, 'checkpoint_manager_blocking_duration_secs': 1.0688204765319824}
I0423 08:04:53.454457 137423608354624 checkpointing.py:408] Started an asynchronous checkpoint save for step 0
I0423 08:04:53.454509 137423608354624 max_utils.py:750] 
Memstats: After params initialized:
I0423 08:04:53.454559 137423608354624 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_16(process=4,(0,4,0,0))
I0423 08:04:53.454591 137423608354624 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_17(process=4,(1,4,0,0))
I0423 08:04:53.454620 137423608354624 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_20(process=4,(0,5,0,0))
I0423 08:04:53.454646 137423608354624 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_21(process=4,(1,5,0,0))
I0423 08:04:53.761343 137423608354624 metric_logger.py:196] completed step: 0, seconds: 11.249, TFLOP/s/device: 1.208, Tokens/s/device: 182.063, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0423 08:04:53.949304 137423608354624 metric_logger.py:196] completed step: 1, seconds: 1.613, TFLOP/s/device: 8.421, Tokens/s/device: 1269.327, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0423 08:04:54.376089 137423608354624 metric_logger.py:196] completed step: 2, seconds: 0.041, TFLOP/s/device: 333.664, Tokens/s/device: 50293.460, total_weights: 65536, loss: 10.262, lm_loss: 10.262, perplexity: 28637.129
I0423 08:04:54.523291 137423608354624 metric_logger.py:196] completed step: 3, seconds: 0.427, TFLOP/s/device: 31.842, Tokens/s/device: 4799.524, total_weights: 65536, loss: 9.734, lm_loss: 9.734, perplexity: 16889.203
I0423 08:04:54.818162 137423608354624 metric_logger.py:196] completed step: 4, seconds: 0.153, TFLOP/s/device: 88.638, Tokens/s/device: 13360.472, total_weights: 65536, loss: 9.277, lm_loss: 9.277, perplexity: 10694.614
I0423 08:04:54.823831 137423608354624 metric_logger.py:196] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.301, Tokens/s/device: 13912.571, total_weights: 65536, loss: 8.892, lm_loss: 8.892, perplexity: 7270.717
I0423 08:04:56.958915    2815 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0423 08:04:59.535352 137293260125952 array_metadata_store.py:203] [process=4][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_13_scan_layers_true/checkpoints/0/items/array_metadatas/process_4
I0423 08:05:16.626466 137423608354624 metric_logger.py:196] completed step: 6, seconds: 0.295, TFLOP/s/device: 46.048, Tokens/s/device: 6940.820, total_weights: 65536, loss: 8.592, lm_loss: 8.592, perplexity: 5390.759
I0423 08:05:16.773882 137423608354624 metric_logger.py:196] completed step: 7, seconds: 21.656, TFLOP/s/device: 0.627, Tokens/s/device: 94.570, total_weights: 65536, loss: 8.384, lm_loss: 8.384, perplexity: 4376.905
I0423 08:05:16.921057 137423608354624 metric_logger.py:196] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.209, Tokens/s/device: 13446.614, total_weights: 65536, loss: 8.255, lm_loss: 8.255, perplexity: 3846.406
I0423 08:05:17.067761 137423608354624 checkpointing.py:772] Waiting for step 9 to finish before checkpoint...
I0423 08:05:17.068377 137423608354624 checkpointing.py:776] Waited 0.0006363391876220703 seconds for step 9 to finish before starting checkpointing.
I0423 08:05:17.070670 137423608354624 checkpoint_manager.py:2020] [process=4][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0423 08:05:30.658982 137294828775168 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/gbytes_per_sec: 42.120 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 37.50246071815491 s) (per-host)
I0423 08:05:30.659098 137294828775168 async_checkpointer.py:90] [process=4][thread=async_save] 3 Handler Commit operations completed. Time taken: 37.215843s.
I0423 08:05:40.251780 137294828775168 async_checkpointer.py:160] [process=4][thread=async_save] Background save thread done. Time taken: 46.808508s.
I0423 08:05:40.252108 137293243340544 async_checkpointer.py:288] [process=4][thread=save_finalize] Done with waiting for background save thread=async_save.
I0423 08:05:40.252224 137293243340544 async_checkpointer.py:298] [process=4][thread=save_finalize] No errors found in background save thread=async_save.
I0423 08:05:40.252275 137293243340544 checkpoint_manager.py:2137] [process=4][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0423 08:05:40.253744 137293243340544 checkpoint_manager.py:2146] [process=4][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0423 08:05:40.253918 137423608354624 checkpoint_manager.py:2032] [process=4][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0.
W0423 08:05:40.254048 137423608354624 checkpoint_manager.py:1452] Waiting for previous save to complete took 23.183379 seconds. If this number is high, consider checkpointing less frequently.
I0423 08:05:40.255831 137423608354624 checkpoint_manager.py:1512] [process=4] Saving checkpoint at step 9
I0423 08:05:40.257937 137423608354624 event_tracking.py:70] [process=4] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_13_scan_layers_true/checkpoints/9.
I0423 08:05:40.541855 137423608354624 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0423 08:05:40.541961 137423608354624 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 08:05:40.583253 137423608354624 base_pytree_checkpoint_handler.py:154] [process=4][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.042453s
I0423 08:05:40.583420 137423608354624 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/blocking_gbytes_per_sec: 33.561 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.045963287353515625 s) (per-host)
I0423 08:05:40.583470 137423608354624 base_pytree_checkpoint_handler.py:768] [process=4][thread=MainThread] Initiated Pytree async_save. Time taken: 0.046023s (batch_requests_ready=0.001770s, total_serialization_initiated=0.044185s, others=0.000068s)
I0423 08:05:40.583562 137423608354624 composite_checkpoint_handler.py:715] [process=4][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.050038s (all_items=0.000015s, per_item={'items': '0.00001502'}, temp_paths=0.050023)
I0423 08:05:40.584304 137423608354624 event_tracking.py:125] [process=4] [async] Finished blocking save in 0.33 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_13_scan_layers_true/checkpoints/9.
I0423 08:05:40.584623 137293243340544 async_checkpointer.py:76] [process=4][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-23 08:25:40.584586
I0423 08:05:40.586657 137423608354624 checkpoint_manager.py:1560] [process=4][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0423 08:05:40.586971 137293260125952 async_checkpointer.py:280] [process=4][thread=save_finalize] Waiting for background save thread=async_save.
I0423 08:05:40.587140 137423608354624 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_13_scan_layers_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776931517.0706394, 'wait_for_prev_duration_secs': 23.18337893486023, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776931540.2558873, 'checkpointer_blocking_duration_secs': 0.32888007164001465, 'get_old_steps_start_time': 1776931540.5847936, 'get_old_steps_duration_secs': 2.9802322387695312e-05, 'checkpoint_manager_blocking_start_time': 1776931517.0685985, 'checkpoint_manager_blocking_duration_secs': 23.518505334854126}
I0423 08:05:40.587255 137423608354624 checkpointing.py:408] Started an asynchronous checkpoint save for step 9
I0423 08:05:40.587301 137423608354624 checkpoint_manager.py:2020] [process=4][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0423 08:05:47.021790 137272791889664 array_metadata_store.py:203] [process=4][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_13_scan_layers_true/checkpoints/9/items/array_metadatas/process_4
I0423 08:06:24.390820 137293243340544 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/gbytes_per_sec: 36.020 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 43.85332417488098 s) (per-host)
I0423 08:06:24.390957 137293243340544 async_checkpointer.py:90] [process=4][thread=async_save] 3 Handler Commit operations completed. Time taken: 43.806221s.
I0423 08:06:32.783291 137293243340544 async_checkpointer.py:160] [process=4][thread=async_save] Background save thread done. Time taken: 52.198536s.
I0423 08:06:32.783571 137293260125952 async_checkpointer.py:288] [process=4][thread=save_finalize] Done with waiting for background save thread=async_save.
I0423 08:06:32.783683 137293260125952 async_checkpointer.py:298] [process=4][thread=save_finalize] No errors found in background save thread=async_save.
I0423 08:06:32.783731 137293260125952 checkpoint_manager.py:2137] [process=4][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0423 08:06:32.785374 137293260125952 checkpoint_manager.py:2146] [process=4][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0423 08:06:32.785551 137423608354624 checkpoint_manager.py:2032] [process=4][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9.
I0423 08:06:32.785700 137423608354624 checkpoint_manager.py:2009] [process=4][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0423 08:06:32.786704 137423608354624 metric_logger.py:196] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.276, Tokens/s/device: 13908.886, 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: Thu Apr 23 08:06:44 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 16:38:31 UTC 2026
2026-04-23 16:38:35.806025: 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 00:00:1776962315.819207      10 cuda_dnn.cc:8579] Unable to register cuDNN factory: Attempting to register factory for plugin cuDNN when one has already been registered
E0000 00:00:1776962315.822922      10 cuda_blas.cc:1407] Unable to register cuBLAS factory: Attempting to register factory for plugin cuBLAS when one has already been registered
W0000 00:00:1776962315.834526      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776962315.834547      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776962315.834549      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776962315.834551      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
2026-04-23 16:38:55.012584: 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 16:38:55.540458 137734109841216 max_utils.py:273] Attempting to initialize the jax distributed system...
INFO:2026-04-23 16:39:04,581:jax._src.distributed:140: Starting JAX distributed service on [::]:8482
I0423 16:39:04.581169 137734109841216 distributed.py:140] Starting JAX distributed service on [::]:8482
INFO:2026-04-23 16:39:04,583:jax._src.distributed:157: Connecting to JAX distributed service on mt-13-scan-layers-true-i3eac-slice-job-0-0.mt-13-scan-layers-true-i3eac:8482
I0423 16:39:04.583453 137734109841216 distributed.py:157] Connecting to JAX distributed service on mt-13-scan-layers-true-i3eac-slice-job-0-0.mt-13-scan-layers-true-i3eac:8482
I0423 16:39:05.662211 137734109841216 max_utils.py:284] Jax distributed system initialized!
I0423 16:39:12.558301 137734109841216 max_utils.py:800] System Information: Jax Version: 0.8.1
I0423 16:39:12.558407 137734109841216 max_utils.py:801] System Information: Jaxlib Version: 0.8.1
I0423 16:39:12.558448 137734109841216 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 16:39:12.558484 137734109841216 train_utils.py:377] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0423 16:39:13.179980 137734109841216 maxtext_utils.py:1631] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0423 16:39:13.180572 137734109841216 maxtext_utils.py:1631] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0423 16:39:13.180752 137734109841216 checkpointing.py:688] Setting up checkpoint logger...
I0423 16:39:13.180803 137734109841216 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True
I0423 16:39:13.180847 137734109841216 pytree_checkpoint_handler.py:589] save_device_host_concurrent_bytes=None
I0423 16:39:13.181231 137734109841216 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 0x7d4436d51370>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0423 16:39:16.188758 137734109841216 checkpointing.py:266] Enabling policy for fixed interval checkpointing.
I0423 16:39:16.189128 137734109841216 checkpoint_manager.py:709] [process=4][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7d303b9a5700>}, handler_registry=None
I0423 16:39:16.189425 137734109841216 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7d303b9a5700>` 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 16:39:16.189478 137734109841216 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d303b9aa4b0>` 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 16:39:16.189515 137734109841216 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 0x7d303b9a5700>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7d303b9a5700>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d303b9aa4b0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d303b9aa4b0>}).
I0423 16:39:16.190028 137734109841216 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.33
I0423 16:39:16.190109 137734109841216 async_checkpointer.py:177] [process=4][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7d2fb8364180> timeout: 600 secs and primary_host=0 for async checkpoint writes
I0423 16:39:17.200240 137734109841216 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_13_scan_layers_true/checkpoints
I0423 16:39:17.649807 137734109841216 checkpoint_manager.py:929] [process=4][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_set_defaults_true_20260423_155242/linen_xpk_feat_nnx_set_defaults_true_20260423_155242_13_scan_layers_true/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7d42f4026c30>
I0423 16:39:17.650017 137734109841216 checkpointing.py:302] Checkpoint manager created!
I0423 16:39:18.562179 137734109841216 nnx_wrappers.py:455] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0423 16:39:18.562283 137734109841216 nnx_wrappers.py:455] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0423 16:39:18.928307 137734109841216 attentions.py:1084] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0423 16:39:18.928404 137734109841216 attentions.py:1084] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0423 16:39:18.944454 137734109841216 attentions.py:1085] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0423 16:39:18.944518 137734109841216 attentions.py:1085] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0423 16:39:18.967604 137734109841216 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 16:39:18.967673 137734109841216 attentions.py:1150] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0423 16:39:18.983626 137734109841216 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 16:39:18.983685 137734109841216 attentions.py:1151] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0423 16:39:18.999433 137734109841216 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 16:39:18.999490 137734109841216 attentions.py:1152] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0423 16:39:19.024644 137734109841216 attentions.py:1193] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0423 16:39:19.024717 137734109841216 attentions.py:1193] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0423 16:39:19.044363 137734109841216 linears.py:541] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0423 16:39:19.044430 137734109841216 linears.py:541] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0423 16:39:19.234015 137734109841216 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint
I0423 16:39:19.234122 137734109841216 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0423 16:39:20.663331 137734109841216 maxtext_utils.py:1740]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   PartitionSpec('norm',)
    Physical:  (None,)
I0423 16:39:20.663461 137734109841216 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 16:39:20.663516 137734109841216 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 16:39:20.663576 137734109841216 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 16:39:20.663628 137734109841216 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 16:39:20.663667 137734109841216 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 16:39:20.663719 137734109841216 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 16:39:20.663771 137734109841216 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 16:39:20.663810 137734109841216 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 16:39:20.663847 137734109841216 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 16:39:20.663911 137734109841216 maxtext_utils.py:1740]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   PartitionSpec('embed', 'vocab')
    Physical:  ('fsdp', None)
I0423 16:39:20.663963 137734109841216 maxtext_utils.py:1740]  params/params/token_embedder/embedding
    Shape:     float32[32000,2048]
    Logical:   PartitionSpec('vocab', 'embed')
    Physical:  (None, 'fsdp')

I0423 16:39:21.172316 137734109841216 train.py:158] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0423 16:39:21.172409 137734109841216 train.py:158] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0423 16:39:21.187429 137734109841216 train.py:165] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0423 16:39:21.187492 137734109841216 train.py:165] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0423 16:39:31.906728 137734109841216 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 16:39:31.907547 137734109841216 metric_logger.py:289] number parameters: 1.104 billion
I0423 16:39:43.127864 137734109841216 checkpointing.py:794] Waiting for step 0 to finish before checkpoint...
I0423 16:39:43.306123 137734109841216 checkpointing.py:798] Waited 0.17824411392211914 seconds for step 0 to finish before starting checkpointing.
I0423 16:39:43.308954 137734109841216 checkpoint_manager.py:2013] [process=4][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0423 16:39:43.310614 137734109841216 checkpoint_manager.py:1518] [process=4] Saving checkpoint at step 0
I0423 16:39:43.313798 137734109841216 async_checkpointer.py:452] [process=4] 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_13_scan_layers_true/checkpoints/0.
I0423 16:39:43.913602 137734109841216 signaling_client.py:364] Using JaxDistributedSignalingClient
I0423 16:39:43.914599 137734109841216 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0423 16:39:43.914655 137734109841216 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 16:39:44.161154 137734109841216 base_pytree_checkpoint_handler.py:153] [process=4][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.247638s
I0423 16:39:44.161335 137734109841216 base_pytree_checkpoint_handler.py:129] [process=4] /jax/checkpoint/write/blocking_gbytes_per_sec: 2.875 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.5365128517150879 s) (per-host)
I0423 16:39:44.161391 137734109841216 base_pytree_checkpoint_handler.py:737] [process=4][thread=MainThread] Initiated Pytree async_save. Time taken: 0.536579s (batch_requests_ready=0.285317s, total_serialization_initiated=0.251188s, others=0.000075s)
I0423 16:39:44.161480 137734109841216 composite_checkpoint_handler.py:715] [process=4][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.540723s (all_items=0.000019s, per_item={'items': '0.00001884'}, temp_paths=0.540704)
I0423 16:39:44.162379 137606322976512 async_checkpointer.py:79] [process=4][thread=async_save] Background save thread started.
I0423 16:39:44.162493 137734109841216 async_checkpointer.py:561] Finished blocking save. Time taken: 0.851810s. 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_13_scan_layers_true/checkpoints/0.
I0423 16:39:44.575821 137734109841216 checkpoint_manager.py:1566] [process=4][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0423 16:39:44.576249 137607901751040 async_checkpointer.py:265] [process=4][thread=save_finalize] Waiting for background save thread=async_save.
I0423 16:39:44.576416 137734109841216 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_13_scan_layers_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776962383.3089359, 'wait_for_prev_duration_secs': 6.29425048828125e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776962383.3106527, 'checkpointer_blocking_duration_secs': 0.851952314376831, 'get_old_steps_start_time': 1776962384.1626267, 'get_old_steps_duration_secs': 2.5987625122070312e-05, 'checkpoint_manager_blocking_start_time': 1776962383.306686, 'checkpoint_manager_blocking_duration_secs': 1.2696881294250488}
I0423 16:39:44.576537 137734109841216 checkpointing.py:409] Started an asynchronous checkpoint save for step 0
I0423 16:39:44.576610 137734109841216 max_utils.py:750] 
Memstats: After params initialized:
I0423 16:39:44.576684 137734109841216 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_16(process=4,(0,4,0,0))
I0423 16:39:44.576742 137734109841216 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_17(process=4,(1,4,0,0))
I0423 16:39:44.576778 137734109841216 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_20(process=4,(0,5,0,0))
I0423 16:39:44.576821 137734109841216 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_21(process=4,(1,5,0,0))
I0423 16:39:44.845824 137734109841216 metric_logger.py:185] completed step: 0, seconds: 11.220, TFLOP/s/device: 1.211, Tokens/s/device: 182.528, total_weights: 65536, loss: 10.874
I0423 16:39:45.016093 137734109841216 metric_logger.py:185] completed step: 1, seconds: 1.717, TFLOP/s/device: 7.915, Tokens/s/device: 1193.048, total_weights: 65536, loss: 10.874
I0423 16:39:45.487765 137734109841216 metric_logger.py:185] completed step: 2, seconds: 0.023, TFLOP/s/device: 587.933, Tokens/s/device: 88619.645, total_weights: 65536, loss: 10.263
I0423 16:39:45.635320 137734109841216 metric_logger.py:185] completed step: 3, seconds: 0.472, TFLOP/s/device: 28.783, Tokens/s/device: 4338.533, total_weights: 65536, loss: 9.734
I0423 16:39:45.930514 137734109841216 metric_logger.py:185] completed step: 4, seconds: 0.153, TFLOP/s/device: 89.001, Tokens/s/device: 13415.257, total_weights: 65536, loss: 9.278
I0423 16:39:45.936425 137734109841216 metric_logger.py:185] completed step: 5, seconds: 0.148, TFLOP/s/device: 92.009, Tokens/s/device: 13868.668, total_weights: 65536, loss: 8.892
I0423 16:40:04.385919 137734109841216 metric_logger.py:185] completed step: 6, seconds: 0.296, TFLOP/s/device: 45.955, Tokens/s/device: 6926.852, total_weights: 65536, loss: 8.592
I0423 16:40:04.533595 137734109841216 metric_logger.py:185] completed step: 7, seconds: 18.303, TFLOP/s/device: 0.742, Tokens/s/device: 111.895, total_weights: 65536, loss: 8.384
I0423 16:40:04.681012 137734109841216 metric_logger.py:185] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.296, Tokens/s/device: 13459.693, total_weights: 65536, loss: 8.255
I0423 16:40:04.828157 137734109841216 checkpointing.py:794] Waiting for step 9 to finish before checkpoint...
I0423 16:40:04.828798 137734109841216 checkpointing.py:798] Waited 0.0006606578826904297 seconds for step 9 to finish before starting checkpointing.
I0423 16:40:04.830810 137734109841216 checkpoint_manager.py:2024] [process=4][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0423 16:40:05.271154    2686 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0423 16:40:07.232616 137607910143744 array_metadata_store.py:203] [process=4][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_13_scan_layers_true/checkpoints/0/items/array_metadatas/process_4
I0423 16:40:38.471727 137606322976512 base_pytree_checkpoint_handler.py:129] [process=4] /jax/checkpoint/write/gbytes_per_sec: 28.800 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 54.846866607666016 s) (per-host)
I0423 16:40:38.471843 137606322976512 async_checkpointer.py:90] [process=4][thread=async_save] 3 Handler Commit operations completed. Time taken: 54.309397s.
I0423 16:40:47.309310 137606322976512 async_checkpointer.py:144] [process=4][thread=async_save] Background save thread done. Time taken: 63.146847s.
I0423 16:40:47.309538 137607901751040 async_checkpointer.py:273] [process=4][thread=save_finalize] Done with waiting for background save thread=async_save.
I0423 16:40:47.309605 137607901751040 async_checkpointer.py:283] [process=4][thread=save_finalize] No errors found in background save thread=async_save.
I0423 16:40:47.309654 137607901751040 checkpoint_manager.py:2133] [process=4][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0423 16:40:47.311397 137607901751040 checkpoint_manager.py:2142] [process=4][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0423 16:40:47.311585 137734109841216 checkpoint_manager.py:2036] [process=4][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0.
W0423 16:40:47.311716 137734109841216 checkpoint_manager.py:1458] Waiting for previous save to complete took 42.480911 seconds. If this number is high, consider checkpointing less frequently.
I0423 16:40:47.313720 137734109841216 checkpoint_manager.py:1518] [process=4] Saving checkpoint at step 9
I0423 16:40:47.317158 137734109841216 async_checkpointer.py:452] [process=4] 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_13_scan_layers_true/checkpoints/9.
I0423 16:40:47.875483 137734109841216 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0423 16:40:47.875583 137734109841216 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 16:40:47.920706 137734109841216 base_pytree_checkpoint_handler.py:153] [process=4][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.046593s
I0423 16:40:47.920865 137734109841216 base_pytree_checkpoint_handler.py:129] [process=4] /jax/checkpoint/write/blocking_gbytes_per_sec: 5.102 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.30232977867126465 s) (per-host)
I0423 16:40:47.920934 137734109841216 base_pytree_checkpoint_handler.py:737] [process=4][thread=MainThread] Initiated Pytree async_save. Time taken: 0.302408s (batch_requests_ready=0.253930s, total_serialization_initiated=0.048392s, others=0.000086s)
I0423 16:40:47.921018 137734109841216 composite_checkpoint_handler.py:715] [process=4][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.306574s (all_items=0.000017s, per_item={'items': '0.00001669'}, temp_paths=0.306558)
I0423 16:40:47.921913 137607878240000 async_checkpointer.py:79] [process=4][thread=async_save] Background save thread started.
I0423 16:40:47.922072 137734109841216 async_checkpointer.py:561] Finished blocking save. Time taken: 0.608282s. 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_13_scan_layers_true/checkpoints/9.
I0423 16:40:47.936394 137734109841216 checkpoint_manager.py:1566] [process=4][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0423 16:40:47.936692 137607901751040 async_checkpointer.py:265] [process=4][thread=save_finalize] Waiting for background save thread=async_save.
I0423 16:40:47.936858 137734109841216 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_13_scan_layers_true/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776962404.8307815, 'wait_for_prev_duration_secs': 42.480910539627075, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776962447.3137596, 'checkpointer_blocking_duration_secs': 0.6084189414978027, 'get_old_steps_start_time': 1776962447.9221983, 'get_old_steps_duration_secs': 2.4557113647460938e-05, 'checkpoint_manager_blocking_start_time': 1776962404.8290741, 'checkpoint_manager_blocking_duration_secs': 43.10774874687195}
I0423 16:40:47.936974 137734109841216 checkpointing.py:409] Started an asynchronous checkpoint save for step 9
I0423 16:40:47.937019 137734109841216 checkpoint_manager.py:2024] [process=4][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0423 16:40:52.763736 137607910143744 array_metadata_store.py:203] [process=4][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_13_scan_layers_true/checkpoints/9/items/array_metadatas/process_4
I0423 16:41:29.518301 137607878240000 base_pytree_checkpoint_handler.py:129] [process=4] /jax/checkpoint/write/gbytes_per_sec: 37.699 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 41.899733781814575 s) (per-host)
I0423 16:41:29.518405 137607878240000 async_checkpointer.py:90] [process=4][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.596378s.
I0423 16:41:36.720808 137607878240000 async_checkpointer.py:144] [process=4][thread=async_save] Background save thread done. Time taken: 48.798766s.
I0423 16:41:36.721144 137607901751040 async_checkpointer.py:273] [process=4][thread=save_finalize] Done with waiting for background save thread=async_save.
I0423 16:41:36.721266 137607901751040 async_checkpointer.py:283] [process=4][thread=save_finalize] No errors found in background save thread=async_save.
I0423 16:41:36.721312 137607901751040 checkpoint_manager.py:2133] [process=4][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0423 16:41:36.722864 137607901751040 checkpoint_manager.py:2142] [process=4][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0423 16:41:36.723056 137734109841216 checkpoint_manager.py:2036] [process=4][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9.
I0423 16:41:36.723212 137734109841216 checkpoint_manager.py:2013] [process=4][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0423 16:41:36.723887 137734109841216 metric_logger.py:185] completed step: 9, seconds: 0.148, TFLOP/s/device: 92.097, Tokens/s/device: 13881.828, total_weights: 65536, loss: 8.179
Per train step:
 Total TFLOPs: 13.59 
 split as 93.93% learnable weight flops and 6.07% attention flops
XPK End: Thu Apr 23 16:41:47 UTC 2026
EXIT_CODE=0