MaxView

Timing Test Reference Updates
‹ 15_ocdbt_false_resumeCase: 15_ocdbt_false_save15_ocdbt_true_resume ›

Metrics: main (574ad3fb9) vs feat/nnx-set-defaults-true (e27fc1e97)

Metricmain  574ad3fb9feat/nnx-set-defaults-true  e27fc1e97Diff (feat/nnx-set-defaults-true − main)
Parameters1.104 billion1.104 billion—
Final loss7.18107.18100
TFLOP/s92.14492.207+0.063
Tok/s13889.013898.5+9.52
Avg s/step4.6594.255-0.404
Memory %1.381.380
JAX0.9.20.8.1—

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

main  ·  574ad3fb9  ·  main_20260420_060028  ·  full log 
XPK Start: Mon Apr 20 07:09:18 UTC 2026
PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used.
2026-04-20 07:09:43.053847: 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)
I0420 07:09:43.234245 137142412810048 max_utils.py:273] Attempting to initialize the jax distributed system...
I0420 07:09:52.275719 137142412810048 distributed.py:149] Starting JAX distributed service on [::]:8482
I0420 07:09:52.278049 137142412810048 distributed.py:172] Connecting to JAX distributed service on mt-15-ocdbt-false-sv-4yx59-slice-job-0-0.mt-15-ocdbt-false-sv-4yx59:8482
I0420 07:09:53.541022 137142412810048 max_utils.py:284] Jax distributed system initialized!
I0420 07:09:58.818147 137142412810048 max_utils.py:800] System Information: Jax Version: 0.9.2
I0420 07:09:58.818249 137142412810048 max_utils.py:801] System Information: Jaxlib Version: 0.9.2
I0420 07:09:58.818287 137142412810048 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
I0420 07:09:58.818320 137142412810048 train_utils.py:348] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0420 07:09:59.509570 137142412810048 maxtext_utils.py:1551] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0420 07:09:59.509858 137142412810048 checkpointing.py:677] Setting up checkpoint logger...
I0420 07:09:59.509911 137142412810048 checkpointing.py:233] Creating checkpoint manager with ocdbt=False and zarr3=True
I0420 07:09:59.509957 137142412810048 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None
I0420 07:09:59.510287 137142412810048 base_pytree_checkpoint_handler.py:441] Created BasePyTreeCheckpointHandler: use_ocdbt=False, use_zarr3=True, pytree_metadata_options=PyTreeMetadataOptions(support_rich_types=False), array_metadata_store=<orbax.checkpoint._src.metadata.array_metadata_store.Store object at 0x7cba5b71c9e0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0420 07:10:02.442781 137142412810048 checkpointing.py:265] Enabling policy for fixed interval checkpointing.
I0420 07:10:02.443008 137142412810048 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 0x7ca5587173b0>}, handler_registry=None
I0420 07:10:02.443241 137142412810048 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7ca5587173b0>` 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`.
I0420 07:10:02.443289 137142412810048 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7ca55871c950>` 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`.
I0420 07:10:02.443324 137142412810048 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 0x7ca5587173b0>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7ca5587173b0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7ca55871c950>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7ca55871c950>}).
I0420 07:10:02.443666 137142412810048 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34
I0420 07:10:02.443736 137142412810048 async_checkpointer.py:192] [process=4][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7ca558697d80> timeout: 1200 secs and primary_host=0 for async checkpoint writes
I0420 07:10:03.665135 137142412810048 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_false/checkpoints
I0420 07:10:03.667277 137142412810048 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=5), preservation_policy=LatestN(n=None), prevent_write_metrics=False, enable_should_save_is_saving_in_progress_check=True, enable_per_process_directory_creation=False, lightweight_initialize=False), root_directory=gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_false/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7ca558716780>
I0420 07:10:03.667400 137142412810048 checkpointing.py:301] Checkpoint manager created!
I0420 07:10:04.593490 137142412810048 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0420 07:10:04.593604 137142412810048 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0420 07:10:04.970936 137142412810048 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0420 07:10:04.971028 137142412810048 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0420 07:10:04.987378 137142412810048 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0420 07:10:04.987434 137142412810048 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0420 07:10:05.010936 137142412810048 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0420 07:10:05.010998 137142412810048 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 07:10:05.027322 137142412810048 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0420 07:10:05.027393 137142412810048 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 07:10:05.043657 137142412810048 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0420 07:10:05.043720 137142412810048 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 07:10:05.068223 137142412810048 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0420 07:10:05.068293 137142412810048 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 07:10:05.090169 137142412810048 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0420 07:10:05.090230 137142412810048 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0420 07:10:05.306899 137142412810048 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint
I0420 07:10:05.307004 137142412810048 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0420 07:10:06.727974 137142412810048 maxtext_utils.py:1654]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   P('norm',)
    Physical:  (None,)
I0420 07:10:06.728096 137142412810048 maxtext_utils.py:1654]  params/params/decoder/layers/mlp/wi_0/kernel
    Shape:     float32[2048,16,7168]
    Logical:   P('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0420 07:10:06.728147 137142412810048 maxtext_utils.py:1654]  params/params/decoder/layers/mlp/wi_1/kernel
    Shape:     float32[2048,16,7168]
    Logical:   P('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0420 07:10:06.728203 137142412810048 maxtext_utils.py:1654]  params/params/decoder/layers/mlp/wo/kernel
    Shape:     float32[7168,16,2048]
    Logical:   P('mlp', 'layers', 'embed')
    Physical:  (None, None, 'fsdp')
I0420 07:10:06.728255 137142412810048 maxtext_utils.py:1654]  params/params/decoder/layers/post_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   P('norm', 'layers')
    Physical:  (None, None)
I0420 07:10:06.728294 137142412810048 maxtext_utils.py:1654]  params/params/decoder/layers/pre_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   P('norm', 'layers')
    Physical:  (None, None)
I0420 07:10:06.728358 137142412810048 maxtext_utils.py:1654]  params/params/decoder/layers/self_attention/key/kernel
    Shape:     float32[2048,16,16,128]
    Logical:   P('embed', 'layers', 'kv_heads', 'kv_head_dim')
    Physical:  ('fsdp', None, None, None)
I0420 07:10:06.728415 137142412810048 maxtext_utils.py:1654]  params/params/decoder/layers/self_attention/out/kernel
    Shape:     float32[16,16,128,2048]
    Logical:   P('heads', 'layers', 'kv', 'embed')
    Physical:  (None, None, None, 'fsdp')
I0420 07:10:06.728454 137142412810048 maxtext_utils.py:1654]  params/params/decoder/layers/self_attention/query/kernel
    Shape:     float32[2048,16,16,128]
    Logical:   P('embed', 'layers', 'q_heads', 'kv')
    Physical:  ('fsdp', None, None, None)
I0420 07:10:06.728491 137142412810048 maxtext_utils.py:1654]  params/params/decoder/layers/self_attention/value/kernel
    Shape:     float32[2048,16,16,128]
    Logical:   P('embed', 'layers', 'kv_heads', 'kv_head_dim')
    Physical:  ('fsdp', None, None, None)

I0420 07:10:06.728537 137142412810048 maxtext_utils.py:1654]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   P('embed_vocab', 'vocab')
    Physical:  ('fsdp', None)
I0420 07:10:06.728590 137142412810048 maxtext_utils.py:1654]  params/params/token_embedder/embedding
    Shape:     float32[32000,2048]
    Logical:   P('vocab', 'embed_vocab')
    Physical:  (None, 'fsdp')
I0420 07:10:07.215329 137142412810048 train.py:155] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0420 07:10:07.215434 137142412810048 train.py:155] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0420 07:10:07.230874 137142412810048 train.py:162] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0420 07:10:07.230938 137142412810048 train.py:162] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0420 07:10:18.124564 137142412810048 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.
I0420 07:10:18.125315 137142412810048 metric_logger.py:301] number parameters: 1.104 billion
I0420 07:10:29.234916 137142412810048 checkpointing.py:772] Waiting for step 0 to finish before checkpoint...
I0420 07:10:29.542640 137142412810048 checkpointing.py:776] Waited 0.30770349502563477 seconds for step 0 to finish before starting checkpointing.
I0420 07:10:29.545270 137142412810048 checkpoint_manager.py:2009] [process=4][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0420 07:10:29.546876 137142412810048 checkpoint_manager.py:1512] [process=4] Saving checkpoint at step 0
I0420 07:10:29.548512 137142412810048 event_tracking.py:70] [process=4] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_false/checkpoints/0.
I0420 07:10:29.956531 137142412810048 signaling_client.py:364] Using JaxDistributedSignalingClient
I0420 07:10:29.957489 137142412810048 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0420 07:10:29.957545 137142412810048 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
I0420 07:10:30.231169 137142412810048 base_pytree_checkpoint_handler.py:154] [process=4][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.274711s
I0420 07:10:30.231356 137142412810048 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/blocking_gbytes_per_sec: 5.507 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.280123233795166 s) (per-host)
I0420 07:10:30.231413 137142412810048 base_pytree_checkpoint_handler.py:768] [process=4][thread=MainThread] Initiated Pytree async_save. Time taken: 0.280208s (batch_requests_ready=0.002211s, total_serialization_initiated=0.277905s, others=0.000092s)
I0420 07:10:30.231506 137142412810048 composite_checkpoint_handler.py:715] [process=4][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.284128s (all_items=0.000018s, per_item={'items': '0.00001764'}, temp_paths=0.284110)
I0420 07:10:30.232362 137142412810048 event_tracking.py:125] [process=4] [async] Finished blocking save in 0.69 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_false/checkpoints/0.
I0420 07:10:30.232701 137014355687168 async_checkpointer.py:76] [process=4][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 07:30:30.232662
I0420 07:10:30.239993 137142412810048 checkpoint_manager.py:1560] [process=4][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0420 07:10:30.240251 137012745074432 async_checkpointer.py:280] [process=4][thread=save_finalize] Waiting for background save thread=async_save.
I0420 07:10:30.240387 137142412810048 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776669029.5452518, 'wait_for_prev_duration_secs': 6.031990051269531e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776669029.5469139, 'checkpointer_blocking_duration_secs': 0.6858887672424316, 'get_old_steps_start_time': 1776669030.232828, 'get_old_steps_duration_secs': 3.170967102050781e-05, 'checkpoint_manager_blocking_start_time': 1776669029.5431995, 'checkpoint_manager_blocking_duration_secs': 0.6971490383148193}
I0420 07:10:30.240493 137142412810048 checkpointing.py:408] Started an asynchronous checkpoint save for step 0
I0420 07:10:30.240545 137142412810048 max_utils.py:750] 
Memstats: After params initialized:
I0420 07:10:30.240596 137142412810048 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_16(process=4,(0,4,0,0))
I0420 07:10:30.240629 137142412810048 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_17(process=4,(1,4,0,0))
I0420 07:10:30.240656 137142412810048 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_20(process=4,(0,5,0,0))
I0420 07:10:30.240681 137142412810048 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_21(process=4,(1,5,0,0))
I0420 07:10:30.551624 137142412810048 metric_logger.py:196] completed step: 0, seconds: 11.109, TFLOP/s/device: 1.223, Tokens/s/device: 184.347, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0420 07:10:30.727224 137142412810048 metric_logger.py:196] completed step: 1, seconds: 1.315, TFLOP/s/device: 10.331, Tokens/s/device: 1557.179, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0420 07:10:31.147266 137142412810048 metric_logger.py:196] completed step: 2, seconds: 0.028, TFLOP/s/device: 479.856, Tokens/s/device: 72329.154, total_weights: 65536, loss: 10.560, lm_loss: 10.560, perplexity: 38547.719
I0420 07:10:31.294656 137142412810048 metric_logger.py:196] completed step: 3, seconds: 0.420, TFLOP/s/device: 32.329, Tokens/s/device: 4872.953, total_weights: 65536, loss: 9.980, lm_loss: 9.980, perplexity: 21590.506
I0420 07:10:31.299791 137142412810048 checkpointing.py:772] Waiting for step 5 to finish before checkpoint...
I0420 07:10:31.588995 137142412810048 checkpointing.py:776] Waited 0.2891807556152344 seconds for step 5 to finish before starting checkpointing.
I0420 07:10:31.591951 137142412810048 checkpoint_manager.py:2020] [process=4][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0420 07:10:33.826515    2833 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0420 07:10:36.471354 137013226391296 array_metadata_store.py:203] [process=4][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_false/checkpoints/0/items/array_metadatas/process_4
I0420 07:10:41.001918 137014355687168 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/gbytes_per_sec: 142.941 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 11.050664901733398 s) (per-host)
I0420 07:10:41.002040 137014355687168 async_checkpointer.py:90] [process=4][thread=async_save] 3 Handler Commit operations completed. Time taken: 10.768707s.
I0420 07:10:47.572778 137014355687168 async_checkpointer.py:160] [process=4][thread=async_save] Background save thread done. Time taken: 17.339429s.
I0420 07:10:47.573086 137012745074432 async_checkpointer.py:288] [process=4][thread=save_finalize] Done with waiting for background save thread=async_save.
I0420 07:10:47.573213 137012745074432 async_checkpointer.py:298] [process=4][thread=save_finalize] No errors found in background save thread=async_save.
I0420 07:10:47.573264 137012745074432 checkpoint_manager.py:2137] [process=4][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0420 07:10:47.574650 137012745074432 checkpoint_manager.py:2146] [process=4][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0420 07:10:47.574860 137142412810048 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.
W0420 07:10:47.574993 137142412810048 checkpoint_manager.py:1452] Waiting for previous save to complete took 15.983043 seconds. If this number is high, consider checkpointing less frequently.
I0420 07:10:47.576889 137142412810048 checkpoint_manager.py:1512] [process=4] Saving checkpoint at step 5
I0420 07:10:47.579312 137142412810048 event_tracking.py:70] [process=4] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_false/checkpoints/5.
I0420 07:10:47.873512 137142412810048 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0420 07:10:47.873609 137142412810048 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
I0420 07:10:47.915518 137142412810048 base_pytree_checkpoint_handler.py:154] [process=4][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.043214s
I0420 07:10:47.915690 137142412810048 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/blocking_gbytes_per_sec: 33.123 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.04657125473022461 s) (per-host)
I0420 07:10:47.915743 137142412810048 base_pytree_checkpoint_handler.py:768] [process=4][thread=MainThread] Initiated Pytree async_save. Time taken: 0.046633s (batch_requests_ready=0.001745s, total_serialization_initiated=0.044818s, others=0.000070s)
I0420 07:10:47.915830 137142412810048 composite_checkpoint_handler.py:715] [process=4][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.051811s (all_items=0.000015s, per_item={'items': '0.00001502'}, temp_paths=0.051796)
I0420 07:10:47.916493 137142412810048 event_tracking.py:125] [process=4] [async] Finished blocking save in 0.34 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_false/checkpoints/5.
I0420 07:10:47.916848 137012745074432 async_checkpointer.py:76] [process=4][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 07:30:47.916807
I0420 07:10:47.918894 137142412810048 checkpoint_manager.py:1560] [process=4][thread=MainThread][step=5] Starting CheckpointManager Save Finalize thread=save_finalize
I0420 07:10:47.919194 137014338901760 async_checkpointer.py:280] [process=4][thread=save_finalize] Waiting for background save thread=async_save.
I0420 07:10:47.919367 137142412810048 standard_logger.py:34] {'step': 5, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776669031.5919218, 'wait_for_prev_duration_secs': 15.98304271697998, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776669047.57693, 'checkpointer_blocking_duration_secs': 0.34006595611572266, 'get_old_steps_start_time': 1776669047.9170167, 'get_old_steps_duration_secs': 3.0994415283203125e-05, 'checkpoint_manager_blocking_start_time': 1776669031.5896683, 'checkpoint_manager_blocking_duration_secs': 16.329653024673462}
I0420 07:10:47.919480 137142412810048 checkpointing.py:408] Started an asynchronous checkpoint save for step 5
I0420 07:10:47.920261 137142412810048 metric_logger.py:196] completed step: 4, seconds: 0.153, TFLOP/s/device: 88.666, Tokens/s/device: 13364.657, total_weights: 65536, loss: 9.460, lm_loss: 9.460, perplexity: 12840.355
I0420 07:10:47.925996 137142412810048 metric_logger.py:196] completed step: 5, seconds: 0.148, TFLOP/s/device: 91.978, Tokens/s/device: 13863.879, total_weights: 65536, loss: 8.959, lm_loss: 8.959, perplexity: 7776.467
I0420 07:10:53.473248 137013226391296 array_metadata_store.py:203] [process=4][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_false/checkpoints/5/items/array_metadatas/process_4
I0420 07:10:58.357959 137012745074432 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/gbytes_per_sec: 150.598 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 10.488804578781128 s) (per-host)
I0420 07:10:58.358067 137012745074432 async_checkpointer.py:90] [process=4][thread=async_save] 3 Handler Commit operations completed. Time taken: 10.441104s.
I0420 07:11:04.712649 137012745074432 async_checkpointer.py:160] [process=4][thread=async_save] Background save thread done. Time taken: 16.795668s.
I0420 07:11:04.712932 137014338901760 async_checkpointer.py:288] [process=4][thread=save_finalize] Done with waiting for background save thread=async_save.
I0420 07:11:04.713049 137014338901760 async_checkpointer.py:298] [process=4][thread=save_finalize] No errors found in background save thread=async_save.
I0420 07:11:04.713097 137014338901760 checkpoint_manager.py:2137] [process=4][thread=save_finalize][step=5] CheckpointManager Save Finalize is syncing with other hosts...
I0420 07:11:04.714656 137014338901760 checkpoint_manager.py:2146] [process=4][thread=save_finalize][step=5] CheckpointManager Save Finalize is done on all hosts.
I0420 07:11:11.013418 137142412810048 metric_logger.py:196] completed step: 6, seconds: 16.625, TFLOP/s/device: 0.817, Tokens/s/device: 123.189, total_weights: 65536, loss: 8.469, lm_loss: 8.469, perplexity: 4762.740
I0420 07:11:11.160748 137142412810048 metric_logger.py:196] completed step: 7, seconds: 22.941, TFLOP/s/device: 0.592, Tokens/s/device: 89.272, total_weights: 65536, loss: 8.003, lm_loss: 8.003, perplexity: 2989.151
I0420 07:11:11.308440 137142412810048 metric_logger.py:196] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.314, Tokens/s/device: 13462.347, total_weights: 65536, loss: 7.572, lm_loss: 7.572, perplexity: 1943.098
I0420 07:11:11.455109 137142412810048 checkpointing.py:772] Waiting for step 9 to finish before checkpoint...
I0420 07:11:11.455721 137142412810048 checkpointing.py:776] Waited 0.00063323974609375 seconds for step 9 to finish before starting checkpointing.
I0420 07:11:11.457905 137142412810048 checkpoint_manager.py:2009] [process=4][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0420 07:11:11.459610 137142412810048 checkpoint_manager.py:1512] [process=4] Saving checkpoint at step 9
I0420 07:11:11.461052 137142412810048 event_tracking.py:70] [process=4] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_false/checkpoints/9.
I0420 07:11:12.016849 137142412810048 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0420 07:11:12.016941 137142412810048 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
I0420 07:11:12.057393 137142412810048 base_pytree_checkpoint_handler.py:154] [process=4][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.041591s
I0420 07:11:12.057543 137142412810048 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/blocking_gbytes_per_sec: 34.302 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.044970035552978516 s) (per-host)
I0420 07:11:12.057592 137142412810048 base_pytree_checkpoint_handler.py:768] [process=4][thread=MainThread] Initiated Pytree async_save. Time taken: 0.045034s (batch_requests_ready=0.001620s, total_serialization_initiated=0.043346s, others=0.000068s)
I0420 07:11:12.057671 137142412810048 composite_checkpoint_handler.py:715] [process=4][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.049020s (all_items=0.000011s, per_item={'items': '0.00001144'}, temp_paths=0.049009)
I0420 07:11:12.058375 137142412810048 event_tracking.py:125] [process=4] [async] Finished blocking save in 0.60 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_false/checkpoints/9.
I0420 07:11:12.058679 136988770359040 async_checkpointer.py:76] [process=4][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 07:31:12.058646
I0420 07:11:12.060577 137142412810048 checkpoint_manager.py:1560] [process=4][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0420 07:11:12.060765 136988820715264 async_checkpointer.py:280] [process=4][thread=save_finalize] Waiting for background save thread=async_save.
I0420 07:11:12.060870 137142412810048 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776669071.4578726, 'wait_for_prev_duration_secs': 7.176399230957031e-05, 'time_between_consecutive_saves_sec': 6.743176221847534, 'checkpointer_blocking_start_time': 1776669071.459647, 'checkpointer_blocking_duration_secs': 0.599170446395874, 'get_old_steps_start_time': 1776669072.0588386, 'get_old_steps_duration_secs': 2.4080276489257812e-05, 'checkpoint_manager_blocking_start_time': 1776669071.4559577, 'checkpoint_manager_blocking_duration_secs': 0.6048836708068848}
I0420 07:11:12.061015 137142412810048 checkpointing.py:408] Started an asynchronous checkpoint save for step 9
I0420 07:11:12.061062 137142412810048 checkpoint_manager.py:2020] [process=4][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0420 07:11:17.511127 136988904642304 array_metadata_store.py:203] [process=4][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_15_ocdbt_false/checkpoints/9/items/array_metadatas/process_4
I0420 07:11:23.138358 136988770359040 base_pytree_checkpoint_handler.py:130] [process=4] /jax/orbax/write/gbytes_per_sec: 141.977 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 11.125738620758057 s) (per-host)
I0420 07:11:23.138476 136988770359040 async_checkpointer.py:90] [process=4][thread=async_save] 3 Handler Commit operations completed. Time taken: 11.079689s.
I0420 07:11:29.191485 136988770359040 async_checkpointer.py:160] [process=4][thread=async_save] Background save thread done. Time taken: 17.132682s.
I0420 07:11:29.191693 136988820715264 async_checkpointer.py:288] [process=4][thread=save_finalize] Done with waiting for background save thread=async_save.
I0420 07:11:29.191749 136988820715264 async_checkpointer.py:298] [process=4][thread=save_finalize] No errors found in background save thread=async_save.
I0420 07:11:29.191789 136988820715264 checkpoint_manager.py:2137] [process=4][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0420 07:11:29.193185 136988820715264 checkpoint_manager.py:2146] [process=4][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0420 07:11:29.193352 137142412810048 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.
I0420 07:11:29.193499 137142412810048 checkpoint_manager.py:2009] [process=4][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0420 07:11:29.194430 137142412810048 metric_logger.py:196] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.144, Tokens/s/device: 13888.983, total_weights: 65536, loss: 7.181, lm_loss: 7.181, perplexity: 1314.495
Per train step:
 Total TFLOPs: 13.59 
 split as 93.93% learnable weight flops and 6.07% attention flops
XPK End: Mon Apr 20 07:11:39 UTC 2026
EXIT_CODE=0
feat/nnx-set-defaults-true  ·  e27fc1e97  ·  feat_nnx_set_defaults_true_20260420_190404  ·  full log 
XPK Start: Mon Apr 20 20:27:09 UTC 2026
2026-04-20 20:27:14.035343: 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 00:00:1776716834.048208      10 cuda_dnn.cc:8579] Unable to register cuDNN factory: Attempting to register factory for plugin cuDNN when one has already been registered
E0000 00:00:1776716834.051926      10 cuda_blas.cc:1407] Unable to register cuBLAS factory: Attempting to register factory for plugin cuBLAS when one has already been registered
W0000 00:00:1776716834.063648      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776716834.063697      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776716834.063700      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776716834.063702      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
2026-04-20 20:27:33.339173: 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)
I0420 20:27:33.862693 134389454583616 max_utils.py:273] Attempting to initialize the jax distributed system...
INFO:2026-04-20 20:27:42,903:jax._src.distributed:140: Starting JAX distributed service on [::]:8482
I0420 20:27:42.903120 134389454583616 distributed.py:140] Starting JAX distributed service on [::]:8482
INFO:2026-04-20 20:27:42,905:jax._src.distributed:157: Connecting to JAX distributed service on mt-15-ocdbt-false-sv-s0h4q-slice-job-0-0.mt-15-ocdbt-false-sv-s0h4q:8482
I0420 20:27:42.905452 134389454583616 distributed.py:157] Connecting to JAX distributed service on mt-15-ocdbt-false-sv-s0h4q-slice-job-0-0.mt-15-ocdbt-false-sv-s0h4q:8482
I0420 20:27:43.809399 134389454583616 max_utils.py:284] Jax distributed system initialized!
I0420 20:27:50.869651 134389454583616 max_utils.py:800] System Information: Jax Version: 0.8.1
I0420 20:27:50.869776 134389454583616 max_utils.py:801] System Information: Jaxlib Version: 0.8.1
I0420 20:27:50.869816 134389454583616 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
I0420 20:27:50.869850 134389454583616 train_utils.py:377] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0420 20:27:51.491744 134389454583616 maxtext_utils.py:1631] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0420 20:27:51.492336 134389454583616 maxtext_utils.py:1631] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0420 20:27:51.492518 134389454583616 checkpointing.py:688] Setting up checkpoint logger...
I0420 20:27:51.492570 134389454583616 checkpointing.py:234] Creating checkpoint manager with ocdbt=False and zarr3=True
I0420 20:27:51.492613 134389454583616 pytree_checkpoint_handler.py:589] save_device_host_concurrent_bytes=None
I0420 20:27:51.492989 134389454583616 base_pytree_checkpoint_handler.py:415] Created BasePyTreeCheckpointHandler: use_ocdbt=False, use_zarr3=True, pytree_metadata_options=PyTreeMetadataOptions(support_rich_types=False), array_metadata_store=<orbax.checkpoint._src.metadata.array_metadata_store.Store object at 0x7a396a579310>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0420 20:27:54.452178 134389454583616 checkpointing.py:266] Enabling policy for fixed interval checkpointing.
I0420 20:27:54.452525 134389454583616 checkpoint_manager.py:709] [process=7][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7a252445d640>}, handler_registry=None
I0420 20:27:54.452776 134389454583616 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7a252445d640>` 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`.
I0420 20:27:54.452827 134389454583616 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7a2524263080>` 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`.
I0420 20:27:54.452864 134389454583616 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 0x7a252445d640>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7a252445d640>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7a2524263080>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7a2524263080>}).
I0420 20:27:54.453380 134389454583616 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.33
I0420 20:27:54.453459 134389454583616 async_checkpointer.py:177] [process=7][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7a25242104a0> timeout: 600 secs and primary_host=0 for async checkpoint writes
I0420 20:27:55.585568 134389454583616 checkpoint_manager.py:1818] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_false/checkpoints
I0420 20:27:56.003019 134389454583616 checkpoint_manager.py:929] [process=7][thread=MainThread] CheckpointManager created,  primary_host=0, CheckpointManagerOptions=CheckpointManagerOptions(save_interval_steps=1, max_to_keep=None, keep_time_interval=None, keep_period=None, should_keep_fn=None, best_fn=None, best_mode='max', keep_checkpoints_without_metrics=True, step_prefix=None, step_format_fixed_length=None, step_name_format=None, create=True, cleanup_tmp_directories=False, save_on_steps=frozenset(), single_host_load_and_broadcast=False, todelete_subdir=None, todelete_full_path=None, enable_background_delete=False, read_only=False, enable_async_checkpointing=True, async_options=None, multiprocessing_options=MultiprocessingOptions(primary_host=0, active_processes=None, barrier_sync_key_prefix=None), should_save_fn=None, file_options=FileOptions(path_permission_mode=None), save_root_metadata=True, temporary_path_class=None, save_decision_policy=FixedIntervalPolicy(interval=5), preservation_policy=LatestN(n=None), prevent_write_metrics=False, enable_should_save_is_saving_in_progress_check=True, enable_per_process_directory_creation=False, lightweight_initialize=False), root_directory=gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_false/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7a2524262b40>
I0420 20:27:56.003199 134389454583616 checkpointing.py:302] Checkpoint manager created!
I0420 20:27:56.911029 134389454583616 nnx_wrappers.py:455] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0420 20:27:56.911137 134389454583616 nnx_wrappers.py:455] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0420 20:27:57.288338 134389454583616 attentions.py:1084] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0420 20:27:57.288435 134389454583616 attentions.py:1084] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0420 20:27:57.304550 134389454583616 attentions.py:1085] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0420 20:27:57.304610 134389454583616 attentions.py:1085] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0420 20:27:57.328186 134389454583616 attentions.py:1150] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0420 20:27:57.328262 134389454583616 attentions.py:1150] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 20:27:57.344187 134389454583616 attentions.py:1151] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0420 20:27:57.344256 134389454583616 attentions.py:1151] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 20:27:57.360097 134389454583616 attentions.py:1152] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0420 20:27:57.360160 134389454583616 attentions.py:1152] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 20:27:57.384160 134389454583616 attentions.py:1193] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0420 20:27:57.384232 134389454583616 attentions.py:1193] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 20:27:57.403886 134389454583616 linears.py:541] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0420 20:27:57.403951 134389454583616 linears.py:541] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0420 20:27:57.592935 134389454583616 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint
I0420 20:27:57.593046 134389454583616 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0420 20:27:59.032439 134389454583616 maxtext_utils.py:1740]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   PartitionSpec('norm',)
    Physical:  (None,)
I0420 20:27:59.032570 134389454583616 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)
I0420 20:27:59.032627 134389454583616 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)
I0420 20:27:59.032885 134389454583616 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')
I0420 20:27:59.032972 134389454583616 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)
I0420 20:27:59.033022 134389454583616 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)
I0420 20:27:59.033082 134389454583616 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)
I0420 20:27:59.033139 134389454583616 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')
I0420 20:27:59.033182 134389454583616 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)
I0420 20:27:59.033233 134389454583616 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)
I0420 20:27:59.033286 134389454583616 maxtext_utils.py:1740]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   PartitionSpec('embed', 'vocab')
    Physical:  ('fsdp', None)
I0420 20:27:59.033336 134389454583616 maxtext_utils.py:1740]  params/params/token_embedder/embedding
    Shape:     float32[32000,2048]
    Logical:   PartitionSpec('vocab', 'embed')

    Physical:  (None, 'fsdp')
I0420 20:27:59.531359 134389454583616 train.py:158] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0420 20:27:59.531457 134389454583616 train.py:158] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0420 20:27:59.546354 134389454583616 train.py:165] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0420 20:27:59.546416 134389454583616 train.py:165] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0420 20:28:10.364191 134389454583616 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.
I0420 20:28:10.365121 134389454583616 metric_logger.py:289] number parameters: 1.104 billion
I0420 20:28:21.629736 134389454583616 checkpointing.py:794] Waiting for step 0 to finish before checkpoint...
I0420 20:28:21.784336 134389454583616 checkpointing.py:798] Waited 0.15458059310913086 seconds for step 0 to finish before starting checkpointing.
I0420 20:28:21.786795 134389454583616 checkpoint_manager.py:2013] [process=7][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0420 20:28:21.788563 134389454583616 checkpoint_manager.py:1518] [process=7] Saving checkpoint at step 0
I0420 20:28:21.791358 134389454583616 async_checkpointer.py:452] [process=7] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_false/checkpoints/0.
I0420 20:28:22.859496 134389454583616 signaling_client.py:364] Using JaxDistributedSignalingClient
I0420 20:28:22.860484 134389454583616 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0420 20:28:22.860543 134389454583616 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
I0420 20:28:23.105626 134389454583616 base_pytree_checkpoint_handler.py:153] [process=7][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.246211s
I0420 20:28:23.105834 134389454583616 base_pytree_checkpoint_handler.py:129] [process=7] /jax/checkpoint/write/blocking_gbytes_per_sec: 2.689 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.5736761093139648 s) (per-host)
I0420 20:28:23.105897 134389454583616 base_pytree_checkpoint_handler.py:737] [process=7][thread=MainThread] Initiated Pytree async_save. Time taken: 0.573747s (batch_requests_ready=0.323788s, total_serialization_initiated=0.249878s, others=0.000082s)
I0420 20:28:23.106019 134389454583616 composite_checkpoint_handler.py:715] [process=7][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.577868s (all_items=0.000020s, per_item={'items': '0.00002003'}, temp_paths=0.577848)
I0420 20:28:23.107007 134266239313664 async_checkpointer.py:79] [process=7][thread=async_save] Background save thread started.
I0420 20:28:23.107204 134389454583616 async_checkpointer.py:561] Finished blocking save. Time taken: 1.318569s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_false/checkpoints/0.
I0420 20:28:23.109079 134389454583616 checkpoint_manager.py:1566] [process=7][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0420 20:28:23.109369 134264065877760 async_checkpointer.py:265] [process=7][thread=save_finalize] Waiting for background save thread=async_save.
I0420 20:28:23.109526 134389454583616 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776716901.7867773, 'wait_for_prev_duration_secs': 6.246566772460938e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776716901.7886016, 'checkpointer_blocking_duration_secs': 1.3187124729156494, 'get_old_steps_start_time': 1776716903.1073353, 'get_old_steps_duration_secs': 2.4318695068359375e-05, 'checkpoint_manager_blocking_start_time': 1776716901.7849276, 'checkpoint_manager_blocking_duration_secs': 1.324561595916748}
I0420 20:28:23.109631 134389454583616 checkpointing.py:409] Started an asynchronous checkpoint save for step 0
I0420 20:28:23.109696 134389454583616 max_utils.py:750] 
Memstats: After params initialized:
I0420 20:28:23.109744 134389454583616 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_26(process=7,(2,6,0,0))
I0420 20:28:23.109779 134389454583616 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_27(process=7,(3,6,0,0))
I0420 20:28:23.109807 134389454583616 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_30(process=7,(2,7,0,0))
I0420 20:28:23.109833 134389454583616 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_31(process=7,(3,7,0,0))
I0420 20:28:23.379363 134389454583616 metric_logger.py:185] completed step: 0, seconds: 11.265, TFLOP/s/device: 1.206, Tokens/s/device: 181.810, total_weights: 65536, loss: 10.874
I0420 20:28:23.540048 134389454583616 metric_logger.py:185] completed step: 1, seconds: 1.748, TFLOP/s/device: 7.772, Tokens/s/device: 1171.424, total_weights: 65536, loss: 10.874
I0420 20:28:23.962923 134389454583616 metric_logger.py:185] completed step: 2, seconds: 0.013, TFLOP/s/device: 1006.603, Tokens/s/device: 151726.182, total_weights: 65536, loss: 10.560
I0420 20:28:24.110204 134389454583616 metric_logger.py:185] completed step: 3, seconds: 0.423, TFLOP/s/device: 32.112, Tokens/s/device: 4840.337, total_weights: 65536, loss: 9.980
I0420 20:28:24.114697 134389454583616 checkpointing.py:794] Waiting for step 5 to finish before checkpoint...
I0420 20:28:24.405135 134389454583616 checkpointing.py:798] Waited 0.2904016971588135 seconds for step 5 to finish before starting checkpointing.
I0420 20:28:24.407818 134389454583616 checkpoint_manager.py:2024] [process=7][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0420 20:28:26.355538    2651 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0420 20:28:28.301698 134266247706368 array_metadata_store.py:203] [process=7][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_false/checkpoints/0/items/array_metadatas/process_7
I0420 20:28:34.020946 134266239313664 base_pytree_checkpoint_handler.py:129] [process=7] /jax/checkpoint/write/gbytes_per_sec: 137.491 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 11.488749504089355 s) (per-host)
I0420 20:28:34.021063 134266239313664 async_checkpointer.py:90] [process=7][thread=async_save] 3 Handler Commit operations completed. Time taken: 10.913922s.
I0420 20:28:39.848769 134266239313664 async_checkpointer.py:144] [process=7][thread=async_save] Background save thread done. Time taken: 16.741613s.
I0420 20:28:39.849082 134264065877760 async_checkpointer.py:273] [process=7][thread=save_finalize] Done with waiting for background save thread=async_save.
I0420 20:28:39.849199 134264065877760 async_checkpointer.py:283] [process=7][thread=save_finalize] No errors found in background save thread=async_save.
I0420 20:28:39.849249 134264065877760 checkpoint_manager.py:2133] [process=7][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0420 20:28:39.850672 134264065877760 checkpoint_manager.py:2142] [process=7][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0420 20:28:39.850875 134389454583616 checkpoint_manager.py:2036] [process=7][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0.
W0420 20:28:39.851023 134389454583616 checkpoint_manager.py:1458] Waiting for previous save to complete took 15.443209 seconds. If this number is high, consider checkpointing less frequently.
I0420 20:28:39.852941 134389454583616 checkpoint_manager.py:1518] [process=7] Saving checkpoint at step 5
I0420 20:28:39.856903 134389454583616 async_checkpointer.py:452] [process=7] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_false/checkpoints/5.
I0420 20:28:40.401916 134389454583616 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0420 20:28:40.402023 134389454583616 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
I0420 20:28:40.446190 134389454583616 base_pytree_checkpoint_handler.py:153] [process=7][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.046189s
I0420 20:28:40.446366 134389454583616 base_pytree_checkpoint_handler.py:129] [process=7] /jax/checkpoint/write/blocking_gbytes_per_sec: 5.025 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.3070087432861328 s) (per-host)
I0420 20:28:40.446421 134389454583616 base_pytree_checkpoint_handler.py:737] [process=7][thread=MainThread] Initiated Pytree async_save. Time taken: 0.307072s (batch_requests_ready=0.258965s, total_serialization_initiated=0.048036s, others=0.000072s)
I0420 20:28:40.446514 134389454583616 composite_checkpoint_handler.py:715] [process=7][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.312078s (all_items=0.000016s, per_item={'items': '0.00001645'}, temp_paths=0.312061)
I0420 20:28:40.447333 134263519557376 async_checkpointer.py:79] [process=7][thread=async_save] Background save thread started.
I0420 20:28:40.447450 134389454583616 async_checkpointer.py:561] Finished blocking save. Time taken: 0.594440s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_false/checkpoints/5.
I0420 20:28:40.457589 134389454583616 checkpoint_manager.py:1566] [process=7][thread=MainThread][step=5] Starting CheckpointManager Save Finalize thread=save_finalize
I0420 20:28:40.457861 134264065877760 async_checkpointer.py:265] [process=7][thread=save_finalize] Waiting for background save thread=async_save.
I0420 20:28:40.457993 134389454583616 standard_logger.py:34] {'step': 5, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776716904.4077892, 'wait_for_prev_duration_secs': 15.443208932876587, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776716919.8529792, 'checkpointer_blocking_duration_secs': 0.5945820808410645, 'get_old_steps_start_time': 1776716920.4475784, 'get_old_steps_duration_secs': 2.5272369384765625e-05, 'checkpoint_manager_blocking_start_time': 1776716904.405813, 'checkpoint_manager_blocking_duration_secs': 16.052145957946777}
I0420 20:28:40.458098 134389454583616 checkpointing.py:409] Started an asynchronous checkpoint save for step 5
I0420 20:28:40.458673 134389454583616 metric_logger.py:185] completed step: 4, seconds: 0.153, TFLOP/s/device: 88.892, Tokens/s/device: 13398.845, total_weights: 65536, loss: 9.460
I0420 20:28:40.464372 134389454583616 metric_logger.py:185] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.367, Tokens/s/device: 13922.502, total_weights: 65536, loss: 8.959
I0420 20:28:59.770792 134389454583616 metric_logger.py:185] completed step: 6, seconds: 16.348, TFLOP/s/device: 0.831, Tokens/s/device: 125.272, total_weights: 65536, loss: 8.469
I0420 20:28:59.918442 134389454583616 metric_logger.py:185] completed step: 7, seconds: 19.160, TFLOP/s/device: 0.709, Tokens/s/device: 106.888, total_weights: 65536, loss: 8.003
I0420 20:29:00.065689 134389454583616 metric_logger.py:185] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.221, Tokens/s/device: 13448.292, total_weights: 65536, loss: 7.572
I0420 20:29:00.212934 134389454583616 checkpointing.py:794] Waiting for step 9 to finish before checkpoint...
I0420 20:29:00.213595 134389454583616 checkpointing.py:798] Waited 0.0006792545318603516 seconds for step 9 to finish before starting checkpointing.
I0420 20:29:00.215526 134389454583616 checkpoint_manager.py:2024] [process=7][thread=MainThread][step=5][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0420 20:29:04.710375 134266247706368 array_metadata_store.py:203] [process=7][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_false/checkpoints/5/items/array_metadatas/process_7
I0420 20:29:10.573050 134263519557376 base_pytree_checkpoint_handler.py:129] [process=7] /jax/checkpoint/write/gbytes_per_sec: 51.903 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 30.43364191055298 s) (per-host)
I0420 20:29:10.573168 134263519557376 async_checkpointer.py:90] [process=7][thread=async_save] 3 Handler Commit operations completed. Time taken: 30.125763s.
I0420 20:29:16.864897 134263519557376 async_checkpointer.py:144] [process=7][thread=async_save] Background save thread done. Time taken: 36.417477s.
I0420 20:29:16.865164 134264065877760 async_checkpointer.py:273] [process=7][thread=save_finalize] Done with waiting for background save thread=async_save.
I0420 20:29:16.865230 134264065877760 async_checkpointer.py:283] [process=7][thread=save_finalize] No errors found in background save thread=async_save.
I0420 20:29:16.865283 134264065877760 checkpoint_manager.py:2133] [process=7][thread=save_finalize][step=5] CheckpointManager Save Finalize is syncing with other hosts...
I0420 20:29:16.866809 134264065877760 checkpoint_manager.py:2142] [process=7][thread=save_finalize][step=5] CheckpointManager Save Finalize is done on all hosts.
I0420 20:29:16.866975 134389454583616 checkpoint_manager.py:2036] [process=7][thread=MainThread][step=5][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=5.
W0420 20:29:16.867123 134389454583616 checkpoint_manager.py:1458] Waiting for previous save to complete took 16.651609 seconds. If this number is high, consider checkpointing less frequently.
I0420 20:29:16.869260 134389454583616 checkpoint_manager.py:1518] [process=7] Saving checkpoint at step 9
I0420 20:29:16.872644 134389454583616 async_checkpointer.py:452] [process=7] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_false/checkpoints/9.
I0420 20:29:17.835232 134389454583616 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0420 20:29:17.835329 134389454583616 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
I0420 20:29:17.877821 134389454583616 base_pytree_checkpoint_handler.py:153] [process=7][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.043834s
I0420 20:29:17.877979 134389454583616 base_pytree_checkpoint_handler.py:129] [process=7] /jax/checkpoint/write/blocking_gbytes_per_sec: 5.163 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.298748254776001 s) (per-host)
I0420 20:29:17.878029 134389454583616 base_pytree_checkpoint_handler.py:737] [process=7][thread=MainThread] Initiated Pytree async_save. Time taken: 0.298808s (batch_requests_ready=0.252931s, total_serialization_initiated=0.045812s, others=0.000064s)
I0420 20:29:17.878115 134389454583616 composite_checkpoint_handler.py:715] [process=7][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.302891s (all_items=0.000012s, per_item={'items': '0.00001168'}, temp_paths=0.302879)
I0420 20:29:17.878969 134260308555520 async_checkpointer.py:79] [process=7][thread=async_save] Background save thread started.
I0420 20:29:17.879145 134389454583616 async_checkpointer.py:561] Finished blocking save. Time taken: 1.009815s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_false/checkpoints/9.
I0420 20:29:17.895555 134389454583616 checkpoint_manager.py:1566] [process=7][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0420 20:29:17.895833 134264065877760 async_checkpointer.py:265] [process=7][thread=save_finalize] Waiting for background save thread=async_save.
I0420 20:29:17.895966 134389454583616 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776716940.2154975, 'wait_for_prev_duration_secs': 16.651609420776367, 'time_between_consecutive_saves_sec': 20.364784955978394, 'checkpointer_blocking_start_time': 1776716956.8693004, 'checkpointer_blocking_duration_secs': 1.0099596977233887, 'get_old_steps_start_time': 1776716957.8792746, 'get_old_steps_duration_secs': 1.9550323486328125e-05, 'checkpoint_manager_blocking_start_time': 1776716940.2138348, 'checkpoint_manager_blocking_duration_secs': 17.682100296020508}
I0420 20:29:17.896072 134389454583616 checkpointing.py:409] Started an asynchronous checkpoint save for step 9
I0420 20:29:17.896116 134389454583616 checkpoint_manager.py:2024] [process=7][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0420 20:29:22.732675 134266247706368 array_metadata_store.py:203] [process=7][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260420_190404/linen_xpk_feat_nnx_set_defaults_true_20260420_190404_15_ocdbt_false/checkpoints/9/items/array_metadatas/process_7
I0420 20:29:29.008474 134260308555520 base_pytree_checkpoint_handler.py:129] [process=7] /jax/checkpoint/write/gbytes_per_sec: 138.207 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 11.429179430007935 s) (per-host)
I0420 20:29:29.008605 134260308555520 async_checkpointer.py:90] [process=7][thread=async_save] 3 Handler Commit operations completed. Time taken: 11.129516s.
I0420 20:29:34.598150 134260308555520 async_checkpointer.py:144] [process=7][thread=async_save] Background save thread done. Time taken: 16.719046s.
I0420 20:29:34.598447 134264065877760 async_checkpointer.py:273] [process=7][thread=save_finalize] Done with waiting for background save thread=async_save.
I0420 20:29:34.598573 134264065877760 async_checkpointer.py:283] [process=7][thread=save_finalize] No errors found in background save thread=async_save.
I0420 20:29:34.598622 134264065877760 checkpoint_manager.py:2133] [process=7][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0420 20:29:34.600167 134264065877760 checkpoint_manager.py:2142] [process=7][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0420 20:29:34.600368 134389454583616 checkpoint_manager.py:2036] [process=7][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9.
I0420 20:29:34.600524 134389454583616 checkpoint_manager.py:2013] [process=7][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0420 20:29:34.601253 134389454583616 metric_logger.py:185] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.207, Tokens/s/device: 13898.503, total_weights: 65536, loss: 7.181
Per train step:
 Total TFLOPs: 13.59 
 split as 93.93% learnable weight flops and 6.07% attention flops
XPK End: Mon Apr 20 20:29:46 UTC 2026
EXIT_CODE=0