MaxView

Timing Test Reference Updates
‹ —Case: 01_base02_synthetic ›

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/s92.21291.940-0.272
Tok/s13899.313858.3-41.007
Avg s/step2.7632.311-0.452
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 07:16:18 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 07:16:43.814136: 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 07:16:44.027234 139969114568512 max_utils.py:273] Attempting to initialize the jax distributed system...
I0423 07:16:53.069191 139969114568512 distributed.py:149] Starting JAX distributed service on [::]:8482
I0423 07:16:53.071433 139969114568512 distributed.py:172] Connecting to JAX distributed service on mt-01-base-qgqp1-slice-job-0-0.mt-01-base-qgqp1:8482
I0423 07:16:54.369602 139969114568512 max_utils.py:284] Jax distributed system initialized!
I0423 07:16:59.756319 139969114568512 max_utils.py:800] System Information: Jax Version: 0.9.2
I0423 07:16:59.756425 139969114568512 max_utils.py:801] System Information: Jaxlib Version: 0.9.2
I0423 07:16:59.756465 139969114568512 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 07:16:59.756502 139969114568512 train_utils.py:361] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0423 07:17:00.452260 139969114568512 maxtext_utils.py:1604] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0423 07:17:00.452537 139969114568512 checkpointing.py:677] Setting up checkpoint logger...
I0423 07:17:00.452592 139969114568512 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True
I0423 07:17:00.452636 139969114568512 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None
I0423 07:17:00.452986 139969114568512 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 0x7f4c7851c290>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0423 07:17:04.382074 139969114568512 checkpointing.py:265] Enabling policy for fixed interval checkpointing.
I0423 07:17:04.382303 139969114568512 checkpoint_manager.py:708] [process=5][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7f4b55a40d40>}, handler_registry=None
I0423 07:17:04.382533 139969114568512 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7f4b55a40d40>` 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 07:17:04.382584 139969114568512 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7f38884fc0e0>` 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 07:17:04.382622 139969114568512 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 0x7f4b55a40d40>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7f4b55a40d40>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7f38884fc0e0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7f38884fc0e0>}).
I0423 07:17:04.382954 139969114568512 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34
I0423 07:17:04.383027 139969114568512 async_checkpointer.py:192] [process=5][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7f3888141760> timeout: 1200 secs and primary_host=0 for async checkpoint writes
I0423 07:17:05.716719 139969114568512 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_01_base/checkpoints
I0423 07:17:06.588046 139969114568512 checkpoint_manager.py:929] [process=5][thread=MainThread] CheckpointManager created,  primary_host=0, CheckpointManagerOptions=CheckpointManagerOptions(save_interval_steps=1, max_to_keep=None, keep_time_interval=None, keep_period=None, should_keep_fn=None, best_fn=None, best_mode='max', keep_checkpoints_without_metrics=True, step_prefix=None, step_format_fixed_length=None, step_name_format=None, create=True, cleanup_tmp_directories=False, save_on_steps=frozenset(), single_host_load_and_broadcast=False, todelete_subdir=None, todelete_full_path=None, enable_background_delete=False, read_only=False, enable_async_checkpointing=True, async_options=None, multiprocessing_options=MultiprocessingOptions(primary_host=0, active_processes=None, barrier_sync_key_prefix=None), should_save_fn=None, file_options=FileOptions(path_permission_mode=None), save_root_metadata=True, temporary_path_class=None, save_decision_policy=FixedIntervalPolicy(interval=10), preservation_policy=LatestN(n=None), prevent_write_metrics=False, enable_should_save_is_saving_in_progress_check=True, enable_per_process_directory_creation=False, lightweight_initialize=False), root_directory=gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_01_base/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7f38884f5550>
I0423 07:17:06.588221 139969114568512 checkpointing.py:301] Checkpoint manager created!
I0423 07:17:07.518441 139969114568512 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0423 07:17:07.518559 139969114568512 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0423 07:17:07.898051 139969114568512 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0423 07:17:07.898144 139969114568512 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0423 07:17:07.914448 139969114568512 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0423 07:17:07.914510 139969114568512 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0423 07:17:07.938139 139969114568512 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 07:17:07.938207 139969114568512 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0423 07:17:07.954587 139969114568512 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 07:17:07.954648 139969114568512 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0423 07:17:07.971009 139969114568512 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 07:17:07.971067 139969114568512 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0423 07:17:07.995614 139969114568512 attentions.py:1198] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0423 07:17:07.995696 139969114568512 attentions.py:1198] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0423 07:17:08.016566 139969114568512 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0423 07:17:08.016634 139969114568512 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0423 07:17:08.225405 139969114568512 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint
I0423 07:17:08.225510 139969114568512 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0423 07:17:09.647239 139969114568512 maxtext_utils.py:1707]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   P('norm',)
    Physical:  (None,)
I0423 07:17:09.647384 139969114568512 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 07:17:09.647457 139969114568512 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 07:17:09.647541 139969114568512 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 07:17:09.647631 139969114568512 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 07:17:09.647706 139969114568512 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 07:17:09.647783 139969114568512 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 07:17:09.647862 139969114568512 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 07:17:09.647923 139969114568512 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 07:17:09.647985 139969114568512 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 07:17:09.648055 139969114568512 maxtext_utils.py:1707]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   P('embed_vocab', 'vocab')
    Physical:  ('fsdp', None)
I0423 07:17:09.648124 139969114568512 maxtext_utils.py:1707]  params/params/token_embedder/embedding
    Shape:     float32[32000,2048]
    Logical:   P('vocab', 'embed_vocab')
    Physical:  (None, 'fsdp')

I0423 07:17:10.145209 139969114568512 train.py:155] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0423 07:17:10.145304 139969114568512 train.py:155] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0423 07:17:10.161117 139969114568512 train.py:162] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0423 07:17:10.161174 139969114568512 train.py:162] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0423 07:17:21.107694 139969114568512 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 07:17:21.108458 139969114568512 metric_logger.py:301] number parameters: 1.104 billion
I0423 07:17:32.245405 139969114568512 checkpointing.py:772] Waiting for step 0 to finish before checkpoint...
I0423 07:17:32.485451 139969114568512 checkpointing.py:776] Waited 0.24002337455749512 seconds for step 0 to finish before starting checkpointing.
I0423 07:17:32.487838 139969114568512 checkpoint_manager.py:2009] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0423 07:17:32.489457 139969114568512 checkpoint_manager.py:1512] [process=5] Saving checkpoint at step 0
I0423 07:17:32.490957 139969114568512 event_tracking.py:70] [process=5] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_01_base/checkpoints/0.
I0423 07:17:33.260526 139969114568512 signaling_client.py:364] Using JaxDistributedSignalingClient
I0423 07:17:33.261488 139969114568512 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0423 07:17:33.261544 139969114568512 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 07:17:33.537520 139969114568512 base_pytree_checkpoint_handler.py:154] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.277066s
I0423 07:17:33.537708 139969114568512 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/blocking_gbytes_per_sec: 5.457 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2826881408691406 s) (per-host)
I0423 07:17:33.537761 139969114568512 base_pytree_checkpoint_handler.py:768] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.282751s (batch_requests_ready=0.002218s, total_serialization_initiated=0.280462s, others=0.000071s)
I0423 07:17:33.537856 139969114568512 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.287419s (all_items=0.000018s, per_item={'items': '0.00001764'}, temp_paths=0.287402)
I0423 07:17:33.538697 139969114568512 event_tracking.py:125] [process=5] [async] Finished blocking save in 1.05 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_01_base/checkpoints/0.
I0423 07:17:33.538989 139842482579200 async_checkpointer.py:76] [process=5][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-23 07:37:33.538954
I0423 07:17:33.546627 139969114568512 checkpoint_manager.py:1560] [process=5][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0423 07:17:33.546945 139840904763136 async_checkpointer.py:280] [process=5][thread=save_finalize] Waiting for background save thread=async_save.
I0423 07:17:33.547099 139969114568512 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_01_base/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776928652.4878206, 'wait_for_prev_duration_secs': 6.031990051269531e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776928652.4894984, 'checkpointer_blocking_duration_secs': 1.049647331237793, 'get_old_steps_start_time': 1776928653.5391712, 'get_old_steps_duration_secs': 3.4332275390625e-05, 'checkpoint_manager_blocking_start_time': 1776928652.485965, 'checkpoint_manager_blocking_duration_secs': 1.0610966682434082}
I0423 07:17:33.547214 139969114568512 checkpointing.py:408] Started an asynchronous checkpoint save for step 0
I0423 07:17:33.547264 139969114568512 max_utils.py:750] 
Memstats: After params initialized:
I0423 07:17:33.547313 139969114568512 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_18(process=5,(2,4,0,0))
I0423 07:17:33.547346 139969114568512 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_19(process=5,(3,4,0,0))
I0423 07:17:33.547371 139969114568512 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_22(process=5,(2,5,0,0))
I0423 07:17:33.547397 139969114568512 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_23(process=5,(3,5,0,0))
I0423 07:17:33.862898 139969114568512 metric_logger.py:196] completed step: 0, seconds: 11.137, TFLOP/s/device: 1.220, Tokens/s/device: 183.894, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0423 07:17:34.030413 139969114568512 metric_logger.py:196] completed step: 1, seconds: 1.616, TFLOP/s/device: 8.408, Tokens/s/device: 1267.289, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0423 07:17:34.438896 139969114568512 metric_logger.py:196] completed step: 2, seconds: 0.020, TFLOP/s/device: 678.237, Tokens/s/device: 102231.318, total_weights: 65536, loss: 10.262, lm_loss: 10.262, perplexity: 28637.129
I0423 07:17:34.586175 139969114568512 metric_logger.py:196] completed step: 3, seconds: 0.408, TFLOP/s/device: 33.276, Tokens/s/device: 5015.649, total_weights: 65536, loss: 9.734, lm_loss: 9.734, perplexity: 16889.203
I0423 07:17:34.881175 139969114568512 metric_logger.py:196] completed step: 4, seconds: 0.154, TFLOP/s/device: 88.502, Tokens/s/device: 13340.021, total_weights: 65536, loss: 9.277, lm_loss: 9.277, perplexity: 10694.614
I0423 07:17:34.886901 139969114568512 metric_logger.py:196] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.294, Tokens/s/device: 13911.531, total_weights: 65536, loss: 8.892, lm_loss: 8.892, perplexity: 7270.717
I0423 07:17:37.134791    2788 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0423 07:17:41.170633 139841418069760 array_metadata_store.py:203] [process=5][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_01_base/checkpoints/0/items/array_metadatas/process_5
I0423 07:17:56.957931 139969114568512 metric_logger.py:196] completed step: 6, seconds: 0.295, TFLOP/s/device: 45.998, Tokens/s/device: 6933.277, total_weights: 65536, loss: 8.592, lm_loss: 8.592, perplexity: 5390.759
I0423 07:17:57.105460 139969114568512 metric_logger.py:196] completed step: 7, seconds: 21.924, TFLOP/s/device: 0.620, Tokens/s/device: 93.414, total_weights: 65536, loss: 8.384, lm_loss: 8.384, perplexity: 4376.905
I0423 07:17:57.252824 139969114568512 metric_logger.py:196] completed step: 8, seconds: 0.153, TFLOP/s/device: 89.003, Tokens/s/device: 13415.433, total_weights: 65536, loss: 8.255, lm_loss: 8.255, perplexity: 3846.406
I0423 07:17:57.399593 139969114568512 checkpointing.py:772] Waiting for step 9 to finish before checkpoint...
I0423 07:17:57.400352 139969114568512 checkpointing.py:776] Waited 0.0007760524749755859 seconds for step 9 to finish before starting checkpointing.
I0423 07:17:57.402345 139969114568512 checkpoint_manager.py:2020] [process=5][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0423 07:18:10.186385 139842482579200 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/gbytes_per_sec: 42.771 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 36.9313268661499 s) (per-host)
I0423 07:18:10.186510 139842482579200 async_checkpointer.py:90] [process=5][thread=async_save] 3 Handler Commit operations completed. Time taken: 36.647408s.
I0423 07:18:20.092934 139842482579200 async_checkpointer.py:160] [process=5][thread=async_save] Background save thread done. Time taken: 46.553814s.
I0423 07:18:20.093249 139840904763136 async_checkpointer.py:288] [process=5][thread=save_finalize] Done with waiting for background save thread=async_save.
I0423 07:18:20.093394 139840904763136 async_checkpointer.py:298] [process=5][thread=save_finalize] No errors found in background save thread=async_save.
I0423 07:18:20.093453 139840904763136 checkpoint_manager.py:2137] [process=5][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0423 07:18:20.095232 139840904763136 checkpoint_manager.py:2146] [process=5][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0423 07:18:20.095397 139969114568512 checkpoint_manager.py:2032] [process=5][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0.
W0423 07:18:20.095526 139969114568512 checkpoint_manager.py:1452] Waiting for previous save to complete took 22.693191 seconds. If this number is high, consider checkpointing less frequently.
I0423 07:18:20.097436 139969114568512 checkpoint_manager.py:1512] [process=5] Saving checkpoint at step 9
I0423 07:18:20.099344 139969114568512 event_tracking.py:70] [process=5] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_01_base/checkpoints/9.
I0423 07:18:20.887111 139969114568512 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0423 07:18:20.887207 139969114568512 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 07:18:20.921534 139969114568512 base_pytree_checkpoint_handler.py:154] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.035656s
I0423 07:18:20.921705 139969114568512 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/blocking_gbytes_per_sec: 39.462 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.03909015655517578 s) (per-host)
I0423 07:18:20.921761 139969114568512 base_pytree_checkpoint_handler.py:768] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.039155s (batch_requests_ready=0.001785s, total_serialization_initiated=0.037298s, others=0.000072s)
I0423 07:18:20.921856 139969114568512 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.043414s (all_items=0.000015s, per_item={'items': '0.00001478'}, temp_paths=0.043399)
I0423 07:18:20.922562 139969114568512 event_tracking.py:125] [process=5] [async] Finished blocking save in 0.83 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_01_base/checkpoints/9.
I0423 07:18:20.922855 139840904763136 async_checkpointer.py:76] [process=5][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-23 07:38:20.922823
I0423 07:18:20.927596 139969114568512 checkpoint_manager.py:1560] [process=5][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0423 07:18:20.927922 139841418069760 async_checkpointer.py:280] [process=5][thread=save_finalize] Waiting for background save thread=async_save.
I0423 07:18:20.928086 139969114568512 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_01_base/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776928677.4023068, 'wait_for_prev_duration_secs': 22.693190574645996, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776928700.0974767, 'checkpointer_blocking_duration_secs': 0.8255209922790527, 'get_old_steps_start_time': 1776928700.9230208, 'get_old_steps_duration_secs': 2.8133392333984375e-05, 'checkpoint_manager_blocking_start_time': 1776928677.400605, 'checkpoint_manager_blocking_duration_secs': 23.527445554733276}
I0423 07:18:20.928191 139969114568512 checkpointing.py:408] Started an asynchronous checkpoint save for step 9
I0423 07:18:20.928238 139969114568512 checkpoint_manager.py:2020] [process=5][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0423 07:18:27.929339 139820839986944 array_metadata_store.py:203] [process=5][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_01_base/checkpoints/9/items/array_metadatas/process_5
I0423 07:19:04.120284 139840904763136 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/gbytes_per_sec: 36.533 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 43.237643003463745 s) (per-host)
I0423 07:19:04.120394 139840904763136 async_checkpointer.py:90] [process=5][thread=async_save] 3 Handler Commit operations completed. Time taken: 43.197430s.
I0423 07:19:13.057983 139840904763136 async_checkpointer.py:160] [process=5][thread=async_save] Background save thread done. Time taken: 52.135002s.
I0423 07:19:13.058277 139841418069760 async_checkpointer.py:288] [process=5][thread=save_finalize] Done with waiting for background save thread=async_save.
I0423 07:19:13.058398 139841418069760 async_checkpointer.py:298] [process=5][thread=save_finalize] No errors found in background save thread=async_save.
I0423 07:19:13.058445 139841418069760 checkpoint_manager.py:2137] [process=5][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0423 07:19:13.059881 139841418069760 checkpoint_manager.py:2146] [process=5][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0423 07:19:13.060069 139969114568512 checkpoint_manager.py:2032] [process=5][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9.
I0423 07:19:13.060220 139969114568512 checkpoint_manager.py:2009] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0423 07:19:13.061151 139969114568512 metric_logger.py:196] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.212, Tokens/s/device: 13899.258, 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 07:19:24 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 15:53:19 UTC 2026
2026-04-23 15:53:23.680374: 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 00:00:1776959603.692731      10 cuda_dnn.cc:8579] Unable to register cuDNN factory: Attempting to register factory for plugin cuDNN when one has already been registered
E0000 00:00:1776959603.696420      10 cuda_blas.cc:1407] Unable to register cuBLAS factory: Attempting to register factory for plugin cuBLAS when one has already been registered
W0000 00:00:1776959603.707784      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776959603.707802      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776959603.707805      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776959603.707807      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
2026-04-23 15:53:42.817424: 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 15:53:43.341212 133935404320576 max_utils.py:273] Attempting to initialize the jax distributed system...
INFO:2026-04-23 15:53:52,381:jax._src.distributed:140: Starting JAX distributed service on [::]:8482
I0423 15:53:52.381943 133935404320576 distributed.py:140] Starting JAX distributed service on [::]:8482
INFO:2026-04-23 15:53:52,384:jax._src.distributed:157: Connecting to JAX distributed service on mt-01-base-ax27p-slice-job-0-0.mt-01-base-ax27p:8482
I0423 15:53:52.384293 133935404320576 distributed.py:157] Connecting to JAX distributed service on mt-01-base-ax27p-slice-job-0-0.mt-01-base-ax27p:8482
I0423 15:53:53.352993 133935404320576 max_utils.py:284] Jax distributed system initialized!
I0423 15:54:00.471065 133935404320576 max_utils.py:800] System Information: Jax Version: 0.8.1
I0423 15:54:00.471171 133935404320576 max_utils.py:801] System Information: Jaxlib Version: 0.8.1
I0423 15:54:00.471215 133935404320576 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 15:54:00.471249 133935404320576 train_utils.py:377] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0423 15:54:01.096784 133935404320576 maxtext_utils.py:1631] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0423 15:54:01.097380 133935404320576 maxtext_utils.py:1631] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0423 15:54:01.097565 133935404320576 checkpointing.py:688] Setting up checkpoint logger...
I0423 15:54:01.097616 133935404320576 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True
I0423 15:54:01.097671 133935404320576 pytree_checkpoint_handler.py:589] save_device_host_concurrent_bytes=None
I0423 15:54:01.098033 133935404320576 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 0x79cfc2575100>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0423 15:54:04.747052 133935404320576 checkpointing.py:266] Enabling policy for fixed interval checkpointing.
I0423 15:54:04.747294 133935404320576 checkpoint_manager.py:709] [process=5][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x79bb584cd640>}, handler_registry=None
I0423 15:54:04.747527 133935404320576 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x79bb584cd640>` 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 15:54:04.747577 133935404320576 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x79bb584d2b40>` 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 15:54:04.747612 133935404320576 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 0x79bb584cd640>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x79bb584cd640>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x79bb584d2b40>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x79bb584d2b40>}).
I0423 15:54:04.748203 133935404320576 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.33
I0423 15:54:04.748285 133935404320576 async_checkpointer.py:177] [process=5][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x79bb1830c180> timeout: 600 secs and primary_host=0 for async checkpoint writes
I0423 15:54:05.901348 133935404320576 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_01_base/checkpoints
I0423 15:54:05.943995 133935404320576 checkpoint_manager.py:929] [process=5][thread=MainThread] CheckpointManager created,  primary_host=0, CheckpointManagerOptions=CheckpointManagerOptions(save_interval_steps=1, max_to_keep=None, keep_time_interval=None, keep_period=None, should_keep_fn=None, best_fn=None, best_mode='max', keep_checkpoints_without_metrics=True, step_prefix=None, step_format_fixed_length=None, step_name_format=None, create=True, cleanup_tmp_directories=False, save_on_steps=frozenset(), single_host_load_and_broadcast=False, todelete_subdir=None, todelete_full_path=None, enable_background_delete=False, read_only=False, enable_async_checkpointing=True, async_options=None, multiprocessing_options=MultiprocessingOptions(primary_host=0, active_processes=None, barrier_sync_key_prefix=None), should_save_fn=None, file_options=FileOptions(path_permission_mode=None), save_root_metadata=True, temporary_path_class=None, save_decision_policy=FixedIntervalPolicy(interval=10), preservation_policy=LatestN(n=None), prevent_write_metrics=False, enable_should_save_is_saving_in_progress_check=True, enable_per_process_directory_creation=False, lightweight_initialize=False), root_directory=gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260423_155242/linen_xpk_feat_nnx_set_defaults_true_20260423_155242_01_base/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x79bb584cb140>
I0423 15:54:05.944143 133935404320576 checkpointing.py:302] Checkpoint manager created!
I0423 15:54:06.846931 133935404320576 nnx_wrappers.py:455] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0423 15:54:06.847035 133935404320576 nnx_wrappers.py:455] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0423 15:54:07.217673 133935404320576 attentions.py:1084] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0423 15:54:07.217768 133935404320576 attentions.py:1084] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0423 15:54:07.233826 133935404320576 attentions.py:1085] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0423 15:54:07.233883 133935404320576 attentions.py:1085] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0423 15:54:07.256928 133935404320576 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 15:54:07.256995 133935404320576 attentions.py:1150] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0423 15:54:07.273150 133935404320576 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 15:54:07.273220 133935404320576 attentions.py:1151] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0423 15:54:07.289271 133935404320576 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 15:54:07.289335 133935404320576 attentions.py:1152] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0423 15:54:07.314494 133935404320576 attentions.py:1193] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0423 15:54:07.314562 133935404320576 attentions.py:1193] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0423 15:54:07.334449 133935404320576 linears.py:541] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0423 15:54:07.334515 133935404320576 linears.py:541] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0423 15:54:07.524959 133935404320576 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint
I0423 15:54:07.525068 133935404320576 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0423 15:54:08.960444 133935404320576 maxtext_utils.py:1740]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   PartitionSpec('norm',)
    Physical:  (None,)
I0423 15:54:08.960574 133935404320576 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 15:54:08.960630 133935404320576 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 15:54:08.960847 133935404320576 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 15:54:08.960928 133935404320576 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 15:54:08.960976 133935404320576 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 15:54:08.961044 133935404320576 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 15:54:08.961103 133935404320576 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 15:54:08.961145 133935404320576 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 15:54:08.961184 133935404320576 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 15:54:08.961235 133935404320576 maxtext_utils.py:1740]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   PartitionSpec('embed', 'vocab')
    Physical:  ('fsdp', None)
I0423 15:54:08.961286 133935404320576 maxtext_utils.py:1740]  params/params/token_embedder/embedding
    Shape:     float32[32000,2048]
    Logical:   PartitionSpec('vocab', 'embed')
    Physical:  (None, 'fsdp')

I0423 15:54:09.461430 133935404320576 train.py:158] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0423 15:54:09.461524 133935404320576 train.py:158] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0423 15:54:09.476511 133935404320576 train.py:165] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0423 15:54:09.476571 133935404320576 train.py:165] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0423 15:54:20.146362 133935404320576 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 15:54:20.147216 133935404320576 metric_logger.py:289] number parameters: 1.104 billion
I0423 15:54:31.327280 133935404320576 checkpointing.py:794] Waiting for step 0 to finish before checkpoint...
I0423 15:54:31.485748 133935404320576 checkpointing.py:798] Waited 0.15845656394958496 seconds for step 0 to finish before starting checkpointing.
I0423 15:54:31.488251 133935404320576 checkpoint_manager.py:2013] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0423 15:54:31.489975 133935404320576 checkpoint_manager.py:1518] [process=5] Saving checkpoint at step 0
I0423 15:54:31.492723 133935404320576 async_checkpointer.py:452] [process=5] 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_01_base/checkpoints/0.
I0423 15:54:32.090621 133935404320576 signaling_client.py:364] Using JaxDistributedSignalingClient
I0423 15:54:32.091556 133935404320576 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0423 15:54:32.091614 133935404320576 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 15:54:32.338380 133935404320576 base_pytree_checkpoint_handler.py:153] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.247837s
I0423 15:54:32.338554 133935404320576 base_pytree_checkpoint_handler.py:129] [process=5] /jax/checkpoint/write/blocking_gbytes_per_sec: 3.004 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.5134434700012207 s) (per-host)
I0423 15:54:32.338608 133935404320576 base_pytree_checkpoint_handler.py:737] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.513506s (batch_requests_ready=0.262010s, total_serialization_initiated=0.251425s, others=0.000071s)
I0423 15:54:32.338716 133935404320576 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.517914s (all_items=0.000021s, per_item={'items': '0.00002122'}, temp_paths=0.517893)
I0423 15:54:32.339634 133809744668416 async_checkpointer.py:79] [process=5][thread=async_save] Background save thread started.
I0423 15:54:32.339821 133935404320576 async_checkpointer.py:561] Finished blocking save. Time taken: 0.849779s. 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_01_base/checkpoints/0.
I0423 15:54:32.367893 133935404320576 checkpoint_manager.py:1566] [process=5][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0423 15:54:32.368199 133808162600704 async_checkpointer.py:265] [process=5][thread=save_finalize] Waiting for background save thread=async_save.
I0423 15:54:32.368332 133935404320576 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_01_base/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776959671.488232, 'wait_for_prev_duration_secs': 6.985664367675781e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776959671.4900134, 'checkpointer_blocking_duration_secs': 0.8499140739440918, 'get_old_steps_start_time': 1776959672.3399475, 'get_old_steps_duration_secs': 2.6226043701171875e-05, 'checkpoint_manager_blocking_start_time': 1776959671.486331, 'checkpoint_manager_blocking_duration_secs': 0.8819611072540283}
I0423 15:54:32.368435 133935404320576 checkpointing.py:409] Started an asynchronous checkpoint save for step 0
I0423 15:54:32.368486 133935404320576 max_utils.py:750] 
Memstats: After params initialized:
I0423 15:54:32.368537 133935404320576 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_18(process=5,(2,4,0,0))
I0423 15:54:32.368570 133935404320576 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_19(process=5,(3,4,0,0))
I0423 15:54:32.368598 133935404320576 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_22(process=5,(2,5,0,0))
I0423 15:54:32.368623 133935404320576 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_23(process=5,(3,5,0,0))
I0423 15:54:32.634752 133935404320576 metric_logger.py:185] completed step: 0, seconds: 11.180, TFLOP/s/device: 1.215, Tokens/s/device: 183.185, total_weights: 65536, loss: 10.874
I0423 15:54:32.805606 133935404320576 metric_logger.py:185] completed step: 1, seconds: 1.306, TFLOP/s/device: 10.402, Tokens/s/device: 1567.925, total_weights: 65536, loss: 10.874
I0423 15:54:33.194661 133935404320576 metric_logger.py:185] completed step: 2, seconds: 0.023, TFLOP/s/device: 579.186, Tokens/s/device: 87301.249, total_weights: 65536, loss: 10.263
I0423 15:54:33.342245 133935404320576 metric_logger.py:185] completed step: 3, seconds: 0.389, TFLOP/s/device: 34.889, Tokens/s/device: 5258.820, total_weights: 65536, loss: 9.734
I0423 15:54:33.637638 133935404320576 metric_logger.py:185] completed step: 4, seconds: 0.153, TFLOP/s/device: 88.901, Tokens/s/device: 13400.072, total_weights: 65536, loss: 9.278
I0423 15:54:33.643277 133935404320576 metric_logger.py:185] completed step: 5, seconds: 0.148, TFLOP/s/device: 92.068, Tokens/s/device: 13877.501, total_weights: 65536, loss: 8.892
I0423 15:54:51.977465 133935404320576 metric_logger.py:185] completed step: 6, seconds: 0.296, TFLOP/s/device: 45.945, Tokens/s/device: 6925.376, total_weights: 65536, loss: 8.592
I0423 15:54:52.125185 133935404320576 metric_logger.py:185] completed step: 7, seconds: 18.187, TFLOP/s/device: 0.747, Tokens/s/device: 112.606, total_weights: 65536, loss: 8.384
I0423 15:54:52.272642 133935404320576 metric_logger.py:185] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.261, Tokens/s/device: 13454.388, total_weights: 65536, loss: 8.255
I0423 15:54:52.419756 133935404320576 checkpointing.py:794] Waiting for step 9 to finish before checkpoint...
I0423 15:54:52.420409 133935404320576 checkpointing.py:798] Waited 0.0006728172302246094 seconds for step 9 to finish before starting checkpointing.
I0423 15:54:52.422459 133935404320576 checkpoint_manager.py:2024] [process=5][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0423 15:54:53.634357    2633 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0423 15:54:55.564891 133809753061120 array_metadata_store.py:203] [process=5][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_01_base/checkpoints/0/items/array_metadatas/process_5
I0423 15:55:27.881232 133809744668416 base_pytree_checkpoint_handler.py:129] [process=5] /jax/checkpoint/write/gbytes_per_sec: 28.179 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 56.056079149246216 s) (per-host)
I0423 15:55:27.881354 133809744668416 async_checkpointer.py:90] [process=5][thread=async_save] 3 Handler Commit operations completed. Time taken: 55.541588s.
I0423 15:55:35.311566 133809744668416 async_checkpointer.py:144] [process=5][thread=async_save] Background save thread done. Time taken: 62.971784s.
I0423 15:55:35.311867 133808162600704 async_checkpointer.py:273] [process=5][thread=save_finalize] Done with waiting for background save thread=async_save.
I0423 15:55:35.312000 133808162600704 async_checkpointer.py:283] [process=5][thread=save_finalize] No errors found in background save thread=async_save.
I0423 15:55:35.312052 133808162600704 checkpoint_manager.py:2133] [process=5][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0423 15:55:35.313711 133808162600704 checkpoint_manager.py:2142] [process=5][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0423 15:55:35.313909 133935404320576 checkpoint_manager.py:2036] [process=5][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0.
W0423 15:55:35.314042 133935404320576 checkpoint_manager.py:1458] Waiting for previous save to complete took 42.891585 seconds. If this number is high, consider checkpointing less frequently.
I0423 15:55:35.316023 133935404320576 checkpoint_manager.py:1518] [process=5] Saving checkpoint at step 9
I0423 15:55:35.319504 133935404320576 async_checkpointer.py:452] [process=5] 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_01_base/checkpoints/9.
I0423 15:55:35.859715 133935404320576 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0423 15:55:35.859816 133935404320576 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 15:55:35.905445 133935404320576 base_pytree_checkpoint_handler.py:153] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.046984s
I0423 15:55:35.905616 133935404320576 base_pytree_checkpoint_handler.py:129] [process=5] /jax/checkpoint/write/blocking_gbytes_per_sec: 5.088 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.3031895160675049 s) (per-host)
I0423 15:55:35.905685 133935404320576 base_pytree_checkpoint_handler.py:737] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.303267s (batch_requests_ready=0.254343s, total_serialization_initiated=0.048839s, others=0.000086s)
I0423 15:55:35.905781 133935404320576 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.307509s (all_items=0.000014s, per_item={'items': '0.00001359'}, temp_paths=0.307496)
I0423 15:55:35.906682 133809178470144 async_checkpointer.py:79] [process=5][thread=async_save] Background save thread started.
I0423 15:55:35.906846 133935404320576 async_checkpointer.py:561] Finished blocking save. Time taken: 0.590754s. 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_01_base/checkpoints/9.
I0423 15:55:35.929013 133935404320576 checkpoint_manager.py:1566] [process=5][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0423 15:55:35.929271 133808162600704 async_checkpointer.py:265] [process=5][thread=save_finalize] Waiting for background save thread=async_save.
I0423 15:55:35.929403 133935404320576 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_01_base/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776959692.4224298, 'wait_for_prev_duration_secs': 42.89158511161804, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776959735.3160613, 'checkpointer_blocking_duration_secs': 0.5908920764923096, 'get_old_steps_start_time': 1776959735.9069726, 'get_old_steps_duration_secs': 2.8371810913085938e-05, 'checkpoint_manager_blocking_start_time': 1776959692.4206362, 'checkpoint_manager_blocking_duration_secs': 43.5087308883667}
I0423 15:55:35.929517 133935404320576 checkpointing.py:409] Started an asynchronous checkpoint save for step 9
I0423 15:55:35.929562 133935404320576 checkpoint_manager.py:2024] [process=5][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0423 15:55:40.732278 133809753061120 array_metadata_store.py:203] [process=5][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_01_base/checkpoints/9/items/array_metadatas/process_5
I0423 15:56:17.495352 133809178470144 base_pytree_checkpoint_handler.py:129] [process=5] /jax/checkpoint/write/gbytes_per_sec: 37.706 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 41.892884254455566 s) (per-host)
I0423 15:56:17.495477 133809178470144 async_checkpointer.py:90] [process=5][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.588680s.
I0423 15:56:25.612553 133809178470144 async_checkpointer.py:144] [process=5][thread=async_save] Background save thread done. Time taken: 49.705740s.
I0423 15:56:25.612793 133808162600704 async_checkpointer.py:273] [process=5][thread=save_finalize] Done with waiting for background save thread=async_save.
I0423 15:56:25.612858 133808162600704 async_checkpointer.py:283] [process=5][thread=save_finalize] No errors found in background save thread=async_save.
I0423 15:56:25.612914 133808162600704 checkpoint_manager.py:2133] [process=5][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0423 15:56:25.614512 133808162600704 checkpoint_manager.py:2142] [process=5][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0423 15:56:25.614696 133935404320576 checkpoint_manager.py:2036] [process=5][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9.
I0423 15:56:25.614839 133935404320576 checkpoint_manager.py:2013] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0423 15:56:25.615474 133935404320576 metric_logger.py:185] completed step: 9, seconds: 0.148, TFLOP/s/device: 91.940, Tokens/s/device: 13858.251, 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 15:56:35 UTC 2026
EXIT_CODE=0