MaxView

Timing Test Reference Updates
‹ —Case: 01_base02_synthetic ›

Metrics: main (574ad3fb9) vs test/pipeline-scan-nnx (574ad3fb9)

Metricmain  574ad3fb9test/pipeline-scan-nnx  574ad3fb9Diff (test/pipeline-scan-nnx − main)
Parameters1.104 billion1.104 billion—
Final loss8.17908.17900
TFLOP/s92.23492.223-0.011
Tok/s13902.513900.9-1.605
Avg s/step3.0712.414-0.657
Memory %1.381.380
JAX0.9.20.8.1—

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

main  ·  574ad3fb9  ·  main_20260418_180002  ·  full log 
XPK Start: Sat Apr 18 18:01:13 UTC 2026
PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used.
2026-04-18 18:01:38.448324: 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)
I0418 18:01:38.627807 136016632297280 max_utils.py:273] Attempting to initialize the jax distributed system...
I0418 18:01:47.667797 136016632297280 distributed.py:149] Starting JAX distributed service on [::]:8482
I0418 18:01:47.670194 136016632297280 distributed.py:172] Connecting to JAX distributed service on mt-01-base-2sag8-slice-job-0-0.mt-01-base-2sag8:8482
I0418 18:01:49.137647 136016632297280 max_utils.py:284] Jax distributed system initialized!
I0418 18:01:56.197314 136016632297280 max_utils.py:800] System Information: Jax Version: 0.9.2
I0418 18:01:56.197413 136016632297280 max_utils.py:801] System Information: Jaxlib Version: 0.9.2
I0418 18:01:56.197469 136016632297280 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
I0418 18:01:56.197514 136016632297280 train_utils.py:348] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0418 18:01:56.911277 136016632297280 maxtext_utils.py:1551] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0418 18:01:56.911563 136016632297280 checkpointing.py:677] Setting up checkpoint logger...
I0418 18:01:56.911619 136016632297280 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True
I0418 18:01:56.911664 136016632297280 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None
I0418 18:01:56.912001 136016632297280 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 0x7bb436918260>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0418 18:02:01.482331 136016632297280 checkpointing.py:265] Enabling policy for fixed interval checkpointing.
I0418 18:02:01.482582 136016632297280 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 0x7b9f743869c0>}, handler_registry=None
I0418 18:02:01.482824 136016632297280 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7b9f743869c0>` 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`.
I0418 18:02:01.482872 136016632297280 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7b9f74388290>` 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`.
I0418 18:02:01.482908 136016632297280 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 0x7b9f743869c0>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7b9f743869c0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7b9f74388290>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7b9f74388290>}).
I0418 18:02:01.483229 136016632297280 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34
I0418 18:02:01.483299 136016632297280 async_checkpointer.py:192] [process=5][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7b9f546afba0> timeout: 1200 secs and primary_host=0 for async checkpoint writes
I0418 18:02:02.509403 136016632297280 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_01_base/checkpoints
I0418 18:02:03.389142 136016632297280 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_20260418_180002/linen_xpk_main_20260418_180002_01_base/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7bb315bdffb0>
I0418 18:02:03.389307 136016632297280 checkpointing.py:301] Checkpoint manager created!
I0418 18:02:04.318331 136016632297280 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0418 18:02:04.318439 136016632297280 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0418 18:02:04.697327 136016632297280 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0418 18:02:04.697414 136016632297280 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0418 18:02:04.713699 136016632297280 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0418 18:02:04.713760 136016632297280 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0418 18:02:04.737531 136016632297280 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0418 18:02:04.737595 136016632297280 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 18:02:04.753716 136016632297280 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0418 18:02:04.753776 136016632297280 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 18:02:04.769909 136016632297280 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0418 18:02:04.769973 136016632297280 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 18:02:04.794766 136016632297280 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0418 18:02:04.794831 136016632297280 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0418 18:02:04.815628 136016632297280 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0418 18:02:04.815692 136016632297280 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0418 18:02:05.031522 136016632297280 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint
I0418 18:02:05.031626 136016632297280 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0418 18:02:06.457116 136016632297280 maxtext_utils.py:1654]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   P('norm',)
    Physical:  (None,)
I0418 18:02:06.457235 136016632297280 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)
I0418 18:02:06.457286 136016632297280 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)
I0418 18:02:06.457343 136016632297280 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')
I0418 18:02:06.457395 136016632297280 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)
I0418 18:02:06.457432 136016632297280 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)
I0418 18:02:06.457497 136016632297280 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)
I0418 18:02:06.457551 136016632297280 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')
I0418 18:02:06.457590 136016632297280 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)
I0418 18:02:06.457626 136016632297280 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)
I0418 18:02:06.457673 136016632297280 maxtext_utils.py:1654]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   P('embed_vocab', 'vocab')
    Physical:  ('fsdp', None)
I0418 18:02:06.457719 136016632297280 maxtext_utils.py:1654]  params/params/token_embedder/embedding
    Shape:     float32[32000,2048]
    Logical:   P('vocab', 'embed_vocab')
    Physical:  (None, 'fsdp')

I0418 18:02:06.945318 136016632297280 train.py:155] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0418 18:02:06.945410 136016632297280 train.py:155] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0418 18:02:06.960833 136016632297280 train.py:162] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0418 18:02:06.960896 136016632297280 train.py:162] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0418 18:02:17.925596 136016632297280 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.
I0418 18:02:17.926374 136016632297280 metric_logger.py:301] number parameters: 1.104 billion
I0418 18:02:28.987720 136016632297280 checkpointing.py:772] Waiting for step 0 to finish before checkpoint...
I0418 18:02:29.319164 136016632297280 checkpointing.py:776] Waited 0.3314321041107178 seconds for step 0 to finish before starting checkpointing.
I0418 18:02:29.321613 136016632297280 checkpoint_manager.py:2009] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0418 18:02:29.323310 136016632297280 checkpoint_manager.py:1512] [process=5] Saving checkpoint at step 0
I0418 18:02:29.324758 136016632297280 event_tracking.py:70] [process=5] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_01_base/checkpoints/0.
I0418 18:02:30.509867 136016632297280 signaling_client.py:364] Using JaxDistributedSignalingClient
I0418 18:02:30.510792 136016632297280 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0418 18:02:30.510847 136016632297280 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
I0418 18:02:30.788037 136016632297280 base_pytree_checkpoint_handler.py:154] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.278241s
I0418 18:02:30.788214 136016632297280 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/blocking_gbytes_per_sec: 5.429 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.28411173820495605 s) (per-host)
I0418 18:02:30.788267 136016632297280 base_pytree_checkpoint_handler.py:768] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.284174s (batch_requests_ready=0.002627s, total_serialization_initiated=0.281476s, others=0.000071s)
I0418 18:02:30.788356 136016632297280 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.288152s (all_items=0.000017s, per_item={'items': '0.00001693'}, temp_paths=0.288136)
I0418 18:02:30.789228 136016632297280 event_tracking.py:125] [process=5] [async] Finished blocking save in 1.47 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_01_base/checkpoints/0.
I0418 18:02:30.789592 135888973575936 async_checkpointer.py:76] [process=5][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-18 18:22:30.789554
I0418 18:02:30.796347 136016632297280 checkpoint_manager.py:1560] [process=5][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0418 18:02:30.796626 135887344273152 async_checkpointer.py:280] [process=5][thread=save_finalize] Waiting for background save thread=async_save.
I0418 18:02:30.796753 136016632297280 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_01_base/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776535349.3215866, 'wait_for_prev_duration_secs': 8.726119995117188e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776535349.3233628, 'checkpointer_blocking_duration_secs': 1.466383457183838, 'get_old_steps_start_time': 1776535350.7897708, 'get_old_steps_duration_secs': 3.0517578125e-05, 'checkpoint_manager_blocking_start_time': 1776535349.319707, 'checkpoint_manager_blocking_duration_secs': 1.4770071506500244}
I0418 18:02:30.796863 136016632297280 checkpointing.py:408] Started an asynchronous checkpoint save for step 0
I0418 18:02:30.796917 136016632297280 max_utils.py:750] 
Memstats: After params initialized:
I0418 18:02:30.796967 136016632297280 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_18(process=5,(2,4,0,0))
I0418 18:02:30.797000 136016632297280 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_19(process=5,(3,4,0,0))
I0418 18:02:30.797027 136016632297280 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_22(process=5,(2,5,0,0))
I0418 18:02:30.797050 136016632297280 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_23(process=5,(3,5,0,0))
I0418 18:02:31.105650 136016632297280 metric_logger.py:196] completed step: 0, seconds: 11.061, TFLOP/s/device: 1.228, Tokens/s/device: 185.152, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0418 18:02:31.296370 136016632297280 metric_logger.py:196] completed step: 1, seconds: 2.116, TFLOP/s/device: 6.420, Tokens/s/device: 967.643, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0418 18:02:31.692446 136016632297280 metric_logger.py:196] completed step: 2, seconds: 0.044, TFLOP/s/device: 312.262, Tokens/s/device: 47067.476, total_weights: 65536, loss: 10.262, lm_loss: 10.262, perplexity: 28637.129
I0418 18:02:31.839858 136016632297280 metric_logger.py:196] completed step: 3, seconds: 0.397, TFLOP/s/device: 34.233, Tokens/s/device: 5159.990, total_weights: 65536, loss: 9.734, lm_loss: 9.734, perplexity: 16889.203
I0418 18:02:32.135124 136016632297280 metric_logger.py:196] completed step: 4, seconds: 0.152, TFLOP/s/device: 89.128, Tokens/s/device: 13434.353, total_weights: 65536, loss: 9.277, lm_loss: 9.277, perplexity: 10694.614
I0418 18:02:32.140931 136016632297280 metric_logger.py:196] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.207, Tokens/s/device: 13898.409, total_weights: 65536, loss: 8.892, lm_loss: 8.892, perplexity: 7270.717
I0418 18:02:36.769223    2828 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0418 18:02:40.319857 135887393478400 array_metadata_store.py:203] [process=5][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_01_base/checkpoints/0/items/array_metadatas/process_5
I0418 18:02:56.479434 136016632297280 metric_logger.py:196] completed step: 6, seconds: 0.296, TFLOP/s/device: 45.968, Tokens/s/device: 6928.844, total_weights: 65536, loss: 8.592, lm_loss: 8.592, perplexity: 5390.759
I0418 18:02:56.626775 136016632297280 metric_logger.py:196] completed step: 7, seconds: 24.192, TFLOP/s/device: 0.562, Tokens/s/device: 84.658, total_weights: 65536, loss: 8.384, lm_loss: 8.384, perplexity: 4376.905
I0418 18:02:56.774048 136016632297280 metric_logger.py:196] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.207, Tokens/s/device: 13446.261, total_weights: 65536, loss: 8.255, lm_loss: 8.255, perplexity: 3846.406
I0418 18:02:56.920902 136016632297280 checkpointing.py:772] Waiting for step 9 to finish before checkpoint...
I0418 18:02:56.921597 136016632297280 checkpointing.py:776] Waited 0.0007135868072509766 seconds for step 9 to finish before starting checkpointing.
I0418 18:02:56.923789 136016632297280 checkpoint_manager.py:2020] [process=5][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0418 18:03:09.217653 135888973575936 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/gbytes_per_sec: 40.802 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 38.713520526885986 s) (per-host)
I0418 18:03:09.217759 135888973575936 async_checkpointer.py:90] [process=5][thread=async_save] 3 Handler Commit operations completed. Time taken: 38.428054s.
I0418 18:03:21.081743 135888973575936 async_checkpointer.py:160] [process=5][thread=async_save] Background save thread done. Time taken: 50.292021s.
I0418 18:03:21.082024 135887344273152 async_checkpointer.py:288] [process=5][thread=save_finalize] Done with waiting for background save thread=async_save.
I0418 18:03:21.082161 135887344273152 async_checkpointer.py:298] [process=5][thread=save_finalize] No errors found in background save thread=async_save.
I0418 18:03:21.082236 135887344273152 checkpoint_manager.py:2137] [process=5][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0418 18:03:21.084198 135887344273152 checkpoint_manager.py:2146] [process=5][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0418 18:03:21.084340 136016632297280 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.
W0418 18:03:21.084431 136016632297280 checkpoint_manager.py:1452] Waiting for previous save to complete took 24.160645 seconds. If this number is high, consider checkpointing less frequently.
I0418 18:03:21.086312 136016632297280 checkpoint_manager.py:1512] [process=5] Saving checkpoint at step 9
I0418 18:03:21.088404 136016632297280 event_tracking.py:70] [process=5] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_01_base/checkpoints/9.
I0418 18:03:21.805513 136016632297280 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0418 18:03:21.805606 136016632297280 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
I0418 18:03:21.851402 136016632297280 base_pytree_checkpoint_handler.py:154] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.047068s
I0418 18:03:21.851588 136016632297280 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/blocking_gbytes_per_sec: 30.451 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.05065727233886719 s) (per-host)
I0418 18:03:21.851641 136016632297280 base_pytree_checkpoint_handler.py:768] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.050721s (batch_requests_ready=0.001908s, total_serialization_initiated=0.048741s, others=0.000072s)
I0418 18:03:21.851732 136016632297280 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.054832s (all_items=0.000016s, per_item={'items': '0.00001574'}, temp_paths=0.054816)
I0418 18:03:21.852479 136016632297280 event_tracking.py:125] [process=5] [async] Finished blocking save in 0.77 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_01_base/checkpoints/9.
I0418 18:03:21.852841 135887344273152 async_checkpointer.py:76] [process=5][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-18 18:23:21.852802
I0418 18:03:21.854827 136016632297280 checkpoint_manager.py:1560] [process=5][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0418 18:03:21.855110 135887393478400 async_checkpointer.py:280] [process=5][thread=save_finalize] Waiting for background save thread=async_save.
I0418 18:03:21.855244 136016632297280 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_01_base/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776535376.9237592, 'wait_for_prev_duration_secs': 24.160645008087158, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776535401.086351, 'checkpointer_blocking_duration_secs': 0.766655445098877, 'get_old_steps_start_time': 1776535401.8530304, 'get_old_steps_duration_secs': 3.147125244140625e-05, 'checkpoint_manager_blocking_start_time': 1776535376.9218338, 'checkpoint_manager_blocking_duration_secs': 24.933377981185913}
I0418 18:03:21.855412 136016632297280 checkpointing.py:408] Started an asynchronous checkpoint save for step 9
I0418 18:03:21.855471 136016632297280 checkpoint_manager.py:2020] [process=5][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0418 18:03:29.938111 135865812625152 array_metadata_store.py:203] [process=5][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_01_base/checkpoints/9/items/array_metadatas/process_5
I0418 18:04:05.668946 135887344273152 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/gbytes_per_sec: 36.008 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 43.86797738075256 s) (per-host)
I0418 18:04:05.669079 135887344273152 async_checkpointer.py:90] [process=5][thread=async_save] 3 Handler Commit operations completed. Time taken: 43.816113s.
I0418 18:04:14.249446 135887344273152 async_checkpointer.py:160] [process=5][thread=async_save] Background save thread done. Time taken: 52.396466s.
I0418 18:04:14.249764 135887393478400 async_checkpointer.py:288] [process=5][thread=save_finalize] Done with waiting for background save thread=async_save.
I0418 18:04:14.249889 135887393478400 async_checkpointer.py:298] [process=5][thread=save_finalize] No errors found in background save thread=async_save.
I0418 18:04:14.249945 135887393478400 checkpoint_manager.py:2137] [process=5][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0418 18:04:14.252395 135887393478400 checkpoint_manager.py:2146] [process=5][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0418 18:04:14.252585 136016632297280 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.
I0418 18:04:14.252735 136016632297280 checkpoint_manager.py:2009] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0418 18:04:14.253656 136016632297280 metric_logger.py:196] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.234, Tokens/s/device: 13902.466, 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: Sat Apr 18 18:04:23 UTC 2026
EXIT_CODE=0
test/pipeline-scan-nnx  ·  574ad3fb9  ·  test_pipeline_scan_nnx_20260419_085454  ·  full log 
XPK Start: Sun Apr 19 08:57:06 UTC 2026
2026-04-19 08:57:10.988661: 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 00:00:1776589031.001092      10 cuda_dnn.cc:8579] Unable to register cuDNN factory: Attempting to register factory for plugin cuDNN when one has already been registered
E0000 00:00:1776589031.004785      10 cuda_blas.cc:1407] Unable to register cuBLAS factory: Attempting to register factory for plugin cuBLAS when one has already been registered
W0000 00:00:1776589031.015888      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776589031.015907      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776589031.015909      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776589031.015911      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
2026-04-19 08:57:31.066273: 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)
I0419 08:57:31.577992 138164502087488 max_utils.py:273] Attempting to initialize the jax distributed system...
INFO:2026-04-19 08:57:40,618:jax._src.distributed:140: Starting JAX distributed service on [::]:8482
I0419 08:57:40.618139 138164502087488 distributed.py:140] Starting JAX distributed service on [::]:8482
INFO:2026-04-19 08:57:40,620:jax._src.distributed:157: Connecting to JAX distributed service on mt-01-base-mcfs3-slice-job-0-0.mt-01-base-mcfs3:8482
I0419 08:57:40.620504 138164502087488 distributed.py:157] Connecting to JAX distributed service on mt-01-base-mcfs3-slice-job-0-0.mt-01-base-mcfs3:8482
I0419 08:57:43.657909 138164502087488 max_utils.py:284] Jax distributed system initialized!
I0419 08:57:50.691830 138164502087488 max_utils.py:800] System Information: Jax Version: 0.8.1
I0419 08:57:50.691933 138164502087488 max_utils.py:801] System Information: Jaxlib Version: 0.8.1
I0419 08:57:50.691974 138164502087488 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
I0419 08:57:50.692009 138164502087488 train_utils.py:347] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0419 08:57:51.312697 138164502087488 maxtext_utils.py:1398] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0419 08:57:51.312983 138164502087488 checkpointing.py:677] Setting up checkpoint logger...
I0419 08:57:51.313039 138164502087488 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True
I0419 08:57:51.313084 138164502087488 pytree_checkpoint_handler.py:589] save_device_host_concurrent_bytes=None
I0419 08:57:51.313452 138164502087488 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 0x7da86c375010>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0419 08:57:55.027408 138164502087488 checkpointing.py:265] Enabling policy for fixed interval checkpointing.
I0419 08:57:55.027783 138164502087488 checkpoint_manager.py:709] [process=3][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7d95acfc5580>}, handler_registry=None
I0419 08:57:55.028058 138164502087488 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7d95acfc5580>` 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`.
I0419 08:57:55.028115 138164502087488 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d94e3fcae10>` 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`.
I0419 08:57:55.028168 138164502087488 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 0x7d95acfc5580>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7d95acfc5580>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d94e3fcae10>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d94e3fcae10>}).
I0419 08:57:55.028716 138164502087488 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.33
I0419 08:57:55.028819 138164502087488 async_checkpointer.py:177] [process=3][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7d943c12c040> timeout: 600 secs and primary_host=0 for async checkpoint writes
I0419 08:57:56.615081 138164502087488 checkpoint_manager.py:1818] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_01_base/checkpoints
I0419 08:57:57.889816 138164502087488 checkpoint_manager.py:929] [process=3][thread=MainThread] CheckpointManager created,  primary_host=0, CheckpointManagerOptions=CheckpointManagerOptions(save_interval_steps=1, max_to_keep=None, keep_time_interval=None, keep_period=None, should_keep_fn=None, best_fn=None, best_mode='max', keep_checkpoints_without_metrics=True, step_prefix=None, step_format_fixed_length=None, step_name_format=None, create=True, cleanup_tmp_directories=False, save_on_steps=frozenset(), single_host_load_and_broadcast=False, todelete_subdir=None, todelete_full_path=None, enable_background_delete=False, read_only=False, enable_async_checkpointing=True, async_options=None, multiprocessing_options=MultiprocessingOptions(primary_host=0, active_processes=None, barrier_sync_key_prefix=None), should_save_fn=None, file_options=FileOptions(path_permission_mode=None), save_root_metadata=True, temporary_path_class=None, save_decision_policy=FixedIntervalPolicy(interval=10), preservation_policy=LatestN(n=None), prevent_write_metrics=False, enable_should_save_is_saving_in_progress_check=True, enable_per_process_directory_creation=False, lightweight_initialize=False), root_directory=gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_01_base/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7d94e3fcac60>
I0419 08:57:57.889991 138164502087488 checkpointing.py:301] Checkpoint manager created!
I0419 08:57:58.789647 138164502087488 nnx_wrappers.py:453] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0419 08:57:58.789757 138164502087488 nnx_wrappers.py:453] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0419 08:57:59.163895 138164502087488 attentions.py:1084] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0419 08:57:59.163986 138164502087488 attentions.py:1084] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0419 08:57:59.180149 138164502087488 attentions.py:1085] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0419 08:57:59.180213 138164502087488 attentions.py:1085] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0419 08:57:59.203263 138164502087488 attentions.py:1150] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0419 08:57:59.203336 138164502087488 attentions.py:1150] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0419 08:57:59.219762 138164502087488 attentions.py:1151] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0419 08:57:59.219827 138164502087488 attentions.py:1151] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0419 08:57:59.235784 138164502087488 attentions.py:1152] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0419 08:57:59.235846 138164502087488 attentions.py:1152] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0419 08:57:59.260693 138164502087488 attentions.py:1193] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0419 08:57:59.260762 138164502087488 attentions.py:1193] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0419 08:57:59.281057 138164502087488 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0419 08:57:59.281131 138164502087488 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0419 08:57:59.470709 138164502087488 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint
I0419 08:57:59.470826 138164502087488 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0419 08:58:00.931218 138164502087488 maxtext_utils.py:1501]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   PartitionSpec('norm',)
    Physical:  (None,)
I0419 08:58:00.931363 138164502087488 maxtext_utils.py:1501]  params/params/decoder/layers/mlp/wi_0/kernel
    Shape:     float32[2048,16,7168]
    Logical:   PartitionSpec('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0419 08:58:00.931419 138164502087488 maxtext_utils.py:1501]  params/params/decoder/layers/mlp/wi_1/kernel
    Shape:     float32[2048,16,7168]
    Logical:   PartitionSpec('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0419 08:58:00.931480 138164502087488 maxtext_utils.py:1501]  params/params/decoder/layers/mlp/wo/kernel
    Shape:     float32[7168,16,2048]
    Logical:   PartitionSpec('mlp', 'layers', 'embed')
    Physical:  (None, None, 'fsdp')
I0419 08:58:00.931535 138164502087488 maxtext_utils.py:1501]  params/params/decoder/layers/post_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   PartitionSpec('norm', 'layers')
    Physical:  (None, None)
I0419 08:58:00.931575 138164502087488 maxtext_utils.py:1501]  params/params/decoder/layers/pre_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   PartitionSpec('norm', 'layers')
    Physical:  (None, None)
I0419 08:58:00.931629 138164502087488 maxtext_utils.py:1501]  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)
I0419 08:58:00.931680 138164502087488 maxtext_utils.py:1501]  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')
I0419 08:58:00.931721 138164502087488 maxtext_utils.py:1501]  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)
I0419 08:58:00.931758 138164502087488 maxtext_utils.py:1501]  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)
I0419 08:58:00.931807 138164502087488 maxtext_utils.py:1501]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   PartitionSpec('embed', 'vocab')
    Physical:  ('fsdp', None)
I0419 08:58:00.931861 138164502087488 maxtext_utils.py:1501]  params/params/token_embedder/embedding
    Shape:     float32[32000,2048]
    Logical:   PartitionSpec('vocab', 'embed')
    Physical:  (None, 'fsdp')

I0419 08:58:01.431449 138164502087488 train.py:156] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0419 08:58:01.431546 138164502087488 train.py:156] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0419 08:58:01.446522 138164502087488 train.py:163] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0419 08:58:01.446582 138164502087488 train.py:163] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0419 08:58:12.185170 138164502087488 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.
I0419 08:58:12.186040 138164502087488 metric_logger.py:289] number parameters: 1.104 billion
I0419 08:58:23.263089 138164502087488 checkpointing.py:772] Waiting for step 0 to finish before checkpoint...
I0419 08:58:23.418944 138164502087488 checkpointing.py:776] Waited 0.1558382511138916 seconds for step 0 to finish before starting checkpointing.
I0419 08:58:23.421664 138164502087488 checkpoint_manager.py:2013] [process=3][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0419 08:58:23.423414 138164502087488 checkpoint_manager.py:1518] [process=3] Saving checkpoint at step 0
I0419 08:58:23.426073 138164502087488 async_checkpointer.py:452] [process=3] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_01_base/checkpoints/0.
I0419 08:58:24.005388 138164502087488 signaling_client.py:364] Using JaxDistributedSignalingClient
I0419 08:58:24.006439 138164502087488 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0419 08:58:24.006497 138164502087488 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
I0419 08:58:24.250228 138164502087488 base_pytree_checkpoint_handler.py:153] [process=3][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.244922s
I0419 08:58:24.250416 138164502087488 base_pytree_checkpoint_handler.py:129] [process=3] /jax/checkpoint/write/blocking_gbytes_per_sec: 3.037 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.5078713893890381 s) (per-host)
I0419 08:58:24.250469 138164502087488 base_pytree_checkpoint_handler.py:737] [process=3][thread=MainThread] Initiated Pytree async_save. Time taken: 0.507934s (batch_requests_ready=0.259326s, total_serialization_initiated=0.248537s, others=0.000071s)
I0419 08:58:24.250562 138164502087488 composite_checkpoint_handler.py:715] [process=3][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.512072s (all_items=0.000020s, per_item={'items': '0.00002027'}, temp_paths=0.512051)
I0419 08:58:24.251497 138039477024512 async_checkpointer.py:79] [process=3][thread=async_save] Background save thread started.
I0419 08:58:24.251667 138164502087488 async_checkpointer.py:561] Finished blocking save. Time taken: 0.828179s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_01_base/checkpoints/0.
I0419 08:58:24.707092 138164502087488 checkpoint_manager.py:1566] [process=3][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0419 08:58:24.707482 138038000727808 async_checkpointer.py:265] [process=3][thread=save_finalize] Waiting for background save thread=async_save.
I0419 08:58:24.707651 138164502087488 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_01_base/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776589103.4216478, 'wait_for_prev_duration_secs': 6.437301635742188e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776589103.423453, 'checkpointer_blocking_duration_secs': 0.8283183574676514, 'get_old_steps_start_time': 1776589104.2517931, 'get_old_steps_duration_secs': 2.6226043701171875e-05, 'checkpoint_manager_blocking_start_time': 1776589103.4194415, 'checkpoint_manager_blocking_duration_secs': 1.2881674766540527}
I0419 08:58:24.707761 138164502087488 checkpointing.py:408] Started an asynchronous checkpoint save for step 0
I0419 08:58:24.707814 138164502087488 max_utils.py:750] 
Memstats: After params initialized:
I0419 08:58:24.707872 138164502087488 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_10(process=3,(2,2,0,0))
I0419 08:58:24.707906 138164502087488 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_11(process=3,(3,2,0,0))
I0419 08:58:24.707935 138164502087488 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_14(process=3,(2,3,0,0))
I0419 08:58:24.707960 138164502087488 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_15(process=3,(3,3,0,0))
I0419 08:58:24.971360 138164502087488 metric_logger.py:185] completed step: 0, seconds: 11.077, TFLOP/s/device: 1.227, Tokens/s/device: 184.889, total_weights: 65536, loss: 10.874
I0419 08:58:25.154144 138164502087488 metric_logger.py:185] completed step: 1, seconds: 1.707, TFLOP/s/device: 7.960, Tokens/s/device: 1199.794, total_weights: 65536, loss: 10.874
I0419 08:58:25.541338 138164502087488 metric_logger.py:185] completed step: 2, seconds: 0.036, TFLOP/s/device: 382.295, Tokens/s/device: 57623.590, total_weights: 65536, loss: 10.263
I0419 08:58:25.688863 138164502087488 metric_logger.py:185] completed step: 3, seconds: 0.387, TFLOP/s/device: 35.071, Tokens/s/device: 5286.239, total_weights: 65536, loss: 9.734
I0419 08:58:25.984435 138164502087488 metric_logger.py:185] completed step: 4, seconds: 0.153, TFLOP/s/device: 88.894, Tokens/s/device: 13399.108, total_weights: 65536, loss: 9.278
I0419 08:58:25.990015 138164502087488 metric_logger.py:185] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.121, Tokens/s/device: 13885.499, total_weights: 65536, loss: 8.892
I0419 08:58:44.842188 138164502087488 metric_logger.py:185] completed step: 6, seconds: 0.296, TFLOP/s/device: 45.924, Tokens/s/device: 6922.146, total_weights: 65536, loss: 8.592
I0419 08:58:44.989699 138164502087488 metric_logger.py:185] completed step: 7, seconds: 18.705, TFLOP/s/device: 0.726, Tokens/s/device: 109.487, total_weights: 65536, loss: 8.384
I0419 08:58:45.137214 138164502087488 metric_logger.py:185] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.265, Tokens/s/device: 13454.918, total_weights: 65536, loss: 8.255
I0419 08:58:45.284498 138164502087488 checkpointing.py:772] Waiting for step 9 to finish before checkpoint...
I0419 08:58:45.285136 138164502087488 checkpointing.py:776] Waited 0.00064849853515625 seconds for step 9 to finish before starting checkpointing.
I0419 08:58:45.287111 138164502087488 checkpoint_manager.py:2024] [process=3][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0419 08:58:46.186523    2662 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0419 08:58:48.136699 138038017513216 array_metadata_store.py:203] [process=3][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_01_base/checkpoints/0/items/array_metadatas/process_3
I0419 08:59:19.972117 138039477024512 base_pytree_checkpoint_handler.py:129] [process=3] /jax/checkpoint/write/gbytes_per_sec: 28.092 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 56.22952198982239 s) (per-host)
I0419 08:59:19.972252 138039477024512 async_checkpointer.py:90] [process=3][thread=async_save] 3 Handler Commit operations completed. Time taken: 55.720627s.
I0419 08:59:28.661071 138039477024512 async_checkpointer.py:144] [process=3][thread=async_save] Background save thread done. Time taken: 64.409448s.
I0419 08:59:28.661414 138038000727808 async_checkpointer.py:273] [process=3][thread=save_finalize] Done with waiting for background save thread=async_save.
I0419 08:59:28.661534 138038000727808 async_checkpointer.py:283] [process=3][thread=save_finalize] No errors found in background save thread=async_save.
I0419 08:59:28.661586 138038000727808 checkpoint_manager.py:2133] [process=3][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0419 08:59:28.663312 138038000727808 checkpoint_manager.py:2142] [process=3][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0419 08:59:28.663520 138164502087488 checkpoint_manager.py:2036] [process=3][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0.
W0419 08:59:28.663654 138164502087488 checkpoint_manager.py:1458] Waiting for previous save to complete took 43.376547 seconds. If this number is high, consider checkpointing less frequently.
I0419 08:59:28.665747 138164502087488 checkpoint_manager.py:1518] [process=3] Saving checkpoint at step 9
I0419 08:59:28.669126 138164502087488 async_checkpointer.py:452] [process=3] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_01_base/checkpoints/9.
I0419 08:59:29.207145 138164502087488 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0419 08:59:29.207259 138164502087488 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
I0419 08:59:29.249709 138164502087488 base_pytree_checkpoint_handler.py:153] [process=3][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.043839s
I0419 08:59:29.249882 138164502087488 base_pytree_checkpoint_handler.py:129] [process=3] /jax/checkpoint/write/blocking_gbytes_per_sec: 5.283 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.29199957847595215 s) (per-host)
I0419 08:59:29.249934 138164502087488 base_pytree_checkpoint_handler.py:737] [process=3][thread=MainThread] Initiated Pytree async_save. Time taken: 0.292061s (batch_requests_ready=0.246302s, total_serialization_initiated=0.045689s, others=0.000070s)
I0419 08:59:29.250022 138164502087488 composite_checkpoint_handler.py:715] [process=3][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.296203s (all_items=0.000016s, per_item={'items': '0.00001574'}, temp_paths=0.296188)
I0419 08:59:29.250954 138038017591040 async_checkpointer.py:79] [process=3][thread=async_save] Background save thread started.
I0419 08:59:29.251112 138164502087488 async_checkpointer.py:561] Finished blocking save. Time taken: 0.585290s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_01_base/checkpoints/9.
I0419 08:59:29.701002 138164502087488 checkpoint_manager.py:1566] [process=3][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0419 08:59:29.701404 138038000727808 async_checkpointer.py:265] [process=3][thread=save_finalize] Waiting for background save thread=async_save.
I0419 08:59:29.701577 138164502087488 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_01_base/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776589125.2870827, 'wait_for_prev_duration_secs': 43.37654733657837, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776589168.6657877, 'checkpointer_blocking_duration_secs': 0.585439920425415, 'get_old_steps_start_time': 1776589169.251259, 'get_old_steps_duration_secs': 2.7894973754882812e-05, 'checkpoint_manager_blocking_start_time': 1776589125.2853715, 'checkpoint_manager_blocking_duration_secs': 44.4161651134491}
I0419 08:59:29.701693 138164502087488 checkpointing.py:408] Started an asynchronous checkpoint save for step 9
I0419 08:59:29.701738 138164502087488 checkpoint_manager.py:2024] [process=3][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0419 08:59:34.453523 138038034298624 array_metadata_store.py:203] [process=3][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260419_085454/linen_xpk_test_pipeline_scan_nnx_20260419_085454_01_base/checkpoints/9/items/array_metadatas/process_3
I0419 09:00:11.641296 138038017591040 base_pytree_checkpoint_handler.py:129] [process=3] /jax/checkpoint/write/gbytes_per_sec: 37.007 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.68335747718811 s) (per-host)
I0419 09:00:11.641416 138038017591040 async_checkpointer.py:90] [process=3][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.390353s.
I0419 09:00:21.624898 138038017591040 async_checkpointer.py:144] [process=3][thread=async_save] Background save thread done. Time taken: 52.373820s.
I0419 09:00:21.625195 138038000727808 async_checkpointer.py:273] [process=3][thread=save_finalize] Done with waiting for background save thread=async_save.
I0419 09:00:21.625344 138038000727808 async_checkpointer.py:283] [process=3][thread=save_finalize] No errors found in background save thread=async_save.
I0419 09:00:21.625395 138038000727808 checkpoint_manager.py:2133] [process=3][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0419 09:00:21.627003 138038000727808 checkpoint_manager.py:2142] [process=3][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0419 09:00:21.627178 138164502087488 checkpoint_manager.py:2036] [process=3][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9.
I0419 09:00:21.627333 138164502087488 checkpoint_manager.py:2013] [process=3][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0419 09:00:21.627969 138164502087488 metric_logger.py:185] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.223, Tokens/s/device: 13900.861, 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: Sun Apr 19 09:00:32 UTC 2026
EXIT_CODE=0