MaxView

Timing Test Reference Updates
‹ 01_baseCase: 02_synthetic03_dropout ›

Metrics: main (574ad3fb9) vs test/pipeline-scan-nnx (e27fc1e97)

Metricmain  574ad3fb9test/pipeline-scan-nnx  e27fc1e97Diff (test/pipeline-scan-nnx − main)
Parameters1.104 billion1.104 billion—
Final loss8.17908.17900
TFLOP/s91.73592.067+0.332
Tok/s13827.313877.4+50.126
Avg s/step2.6972.453-0.244
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 06:04:23 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 06:05:03.169743: 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 06:05:03.705629 134537364629312 max_utils.py:273] Attempting to initialize the jax distributed system...
I0420 06:05:12.747409 134537364629312 distributed.py:149] Starting JAX distributed service on [::]:8482
I0420 06:05:12.749641 134537364629312 distributed.py:172] Connecting to JAX distributed service on mt-02-synthetic-2y2f8-slice-job-0-0.mt-02-synthetic-2y2f8:8482
I0420 06:05:19.953547 134537364629312 max_utils.py:284] Jax distributed system initialized!
I0420 06:05:26.425812 134537364629312 max_utils.py:800] System Information: Jax Version: 0.9.2
I0420 06:05:26.425916 134537364629312 max_utils.py:801] System Information: Jaxlib Version: 0.9.2
I0420 06:05:26.425956 134537364629312 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 06:05:26.425998 134537364629312 train_utils.py:348] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0420 06:05:27.123493 134537364629312 maxtext_utils.py:1551] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0420 06:05:27.123769 134537364629312 checkpointing.py:677] Setting up checkpoint logger...
I0420 06:05:27.123822 134537364629312 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True
I0420 06:05:27.123873 134537364629312 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None
I0420 06:05:27.124198 134537364629312 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 0x7a5bcd514050>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0420 06:05:30.189278 134537364629312 checkpointing.py:265] Enabling policy for fixed interval checkpointing.
I0420 06:05:30.189555 134537364629312 checkpoint_manager.py:708] [process=3][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7a4774447890>}, handler_registry=None
I0420 06:05:30.189790 134537364629312 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7a4774447890>` 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 06:05:30.189842 134537364629312 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7a4774449520>` 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 06:05:30.189878 134537364629312 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 0x7a4774447890>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7a4774447890>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7a4774449520>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7a4774449520>}).
I0420 06:05:30.190189 134537364629312 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34
I0420 06:05:30.190259 134537364629312 async_checkpointer.py:192] [process=3][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7a474c7d3880> timeout: 1200 secs and primary_host=0 for async checkpoint writes
I0420 06:05:31.867599 134537364629312 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_02_synthetic/checkpoints
I0420 06:05:32.721962 134537364629312 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_main_20260420_060028/linen_xpk_main_20260420_060028_02_synthetic/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7a4774445160>
I0420 06:05:32.722133 134537364629312 checkpointing.py:301] Checkpoint manager created!
I0420 06:05:33.647060 134537364629312 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0420 06:05:33.647170 134537364629312 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0420 06:05:34.025807 134537364629312 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0420 06:05:34.025899 134537364629312 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0420 06:05:34.042320 134537364629312 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0420 06:05:34.042382 134537364629312 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0420 06:05:34.065995 134537364629312 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 06:05:34.066061 134537364629312 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 06:05:34.082418 134537364629312 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 06:05:34.082478 134537364629312 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 06:05:34.098690 134537364629312 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 06:05:34.098749 134537364629312 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 06:05:34.124208 134537364629312 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0420 06:05:34.124280 134537364629312 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0420 06:05:34.145139 134537364629312 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0420 06:05:34.145202 134537364629312 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0420 06:05:34.358899 134537364629312 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint
I0420 06:05:34.359006 134537364629312 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0420 06:05:35.770669 134537364629312 maxtext_utils.py:1654]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   P('norm',)
    Physical:  (None,)
I0420 06:05:35.770787 134537364629312 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 06:05:35.770846 134537364629312 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 06:05:35.770904 134537364629312 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 06:05:35.770958 134537364629312 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 06:05:35.770997 134537364629312 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 06:05:35.771049 134537364629312 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 06:05:35.771100 134537364629312 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 06:05:35.771140 134537364629312 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 06:05:35.771177 134537364629312 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 06:05:35.771223 134537364629312 maxtext_utils.py:1654]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   P('embed_vocab', 'vocab')
    Physical:  ('fsdp', None)
I0420 06:05:35.771270 134537364629312 maxtext_utils.py:1654]  params/params/token_embedder/embedding
    Shape:     float32[32000,2048]

    Logical:   P('vocab', 'embed_vocab')
    Physical:  (None, 'fsdp')
I0420 06:05:36.256777 134537364629312 train.py:155] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0420 06:05:36.256868 134537364629312 train.py:155] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0420 06:05:36.272108 134537364629312 train.py:162] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0420 06:05:36.272166 134537364629312 train.py:162] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0420 06:05:47.315834 134537364629312 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 06:05:47.316628 134537364629312 metric_logger.py:301] number parameters: 1.104 billion
I0420 06:05:58.597790 134537364629312 checkpointing.py:772] Waiting for step 0 to finish before checkpoint...
I0420 06:05:58.750764 134537364629312 checkpointing.py:776] Waited 0.15296649932861328 seconds for step 0 to finish before starting checkpointing.
I0420 06:05:58.753222 134537364629312 checkpoint_manager.py:2009] [process=3][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0420 06:05:58.754627 134537364629312 checkpoint_manager.py:1512] [process=3] Saving checkpoint at step 0
I0420 06:05:58.756154 134537364629312 event_tracking.py:70] [process=3] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_02_synthetic/checkpoints/0.
I0420 06:05:59.495821 134537364629312 signaling_client.py:364] Using JaxDistributedSignalingClient
I0420 06:05:59.496773 134537364629312 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0420 06:05:59.496833 134537364629312 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 06:05:59.778315 134537364629312 base_pytree_checkpoint_handler.py:154] [process=3][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.282556s
I0420 06:05:59.778496 134537364629312 base_pytree_checkpoint_handler.py:130] [process=3] /jax/orbax/write/blocking_gbytes_per_sec: 5.357 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2879605293273926 s) (per-host)
I0420 06:05:59.778549 134537364629312 base_pytree_checkpoint_handler.py:768] [process=3][thread=MainThread] Initiated Pytree async_save. Time taken: 0.288026s (batch_requests_ready=0.002177s, total_serialization_initiated=0.285775s, others=0.000074s)
I0420 06:05:59.778637 134537364629312 composite_checkpoint_handler.py:715] [process=3][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.292061s (all_items=0.000018s, per_item={'items': '0.00001764'}, temp_paths=0.292043)
I0420 06:05:59.779476 134537364629312 event_tracking.py:125] [process=3] [async] Finished blocking save in 1.02 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_02_synthetic/checkpoints/0.
I0420 06:05:59.779807 134408015165184 async_checkpointer.py:76] [process=3][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 06:25:59.779768
I0420 06:05:59.782449 134537364629312 checkpoint_manager.py:1560] [process=3][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0420 06:05:59.782698 134401551742720 async_checkpointer.py:280] [process=3][thread=save_finalize] Waiting for background save thread=async_save.
I0420 06:05:59.782817 134537364629312 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_02_synthetic/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776665158.7532036, 'wait_for_prev_duration_secs': 6.127357482910156e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776665158.7546682, 'checkpointer_blocking_duration_secs': 1.025301456451416, 'get_old_steps_start_time': 1776665159.7799947, 'get_old_steps_duration_secs': 3.170967102050781e-05, 'checkpoint_manager_blocking_start_time': 1776665158.751357, 'checkpoint_manager_blocking_duration_secs': 1.0314197540283203}
I0420 06:05:59.782932 134537364629312 checkpointing.py:408] Started an asynchronous checkpoint save for step 0
I0420 06:05:59.782985 134537364629312 max_utils.py:750] 
Memstats: After params initialized:
I0420 06:05:59.783034 134537364629312 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_10(process=3,(2,2,0,0))
I0420 06:05:59.783066 134537364629312 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_11(process=3,(3,2,0,0))
I0420 06:05:59.783091 134537364629312 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_14(process=3,(2,3,0,0))
I0420 06:05:59.783114 134537364629312 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_15(process=3,(3,3,0,0))
I0420 06:06:00.093813 134537364629312 metric_logger.py:196] completed step: 0, seconds: 11.281, TFLOP/s/device: 1.204, Tokens/s/device: 181.543, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0420 06:06:00.272749 134537364629312 metric_logger.py:196] completed step: 1, seconds: 1.495, TFLOP/s/device: 9.091, Tokens/s/device: 1370.334, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0420 06:06:00.690477 134537364629312 metric_logger.py:196] completed step: 2, seconds: 0.032, TFLOP/s/device: 427.255, Tokens/s/device: 64400.491, total_weights: 65536, loss: 10.262, lm_loss: 10.262, perplexity: 28637.129
I0420 06:06:00.837826 134537364629312 metric_logger.py:196] completed step: 3, seconds: 0.418, TFLOP/s/device: 32.490, Tokens/s/device: 4897.295, total_weights: 65536, loss: 9.734, lm_loss: 9.734, perplexity: 16889.203
I0420 06:06:01.132997 134537364629312 metric_logger.py:196] completed step: 4, seconds: 0.152, TFLOP/s/device: 89.114, Tokens/s/device: 13432.239, total_weights: 65536, loss: 9.277, lm_loss: 9.277, perplexity: 10694.614
I0420 06:06:01.138906 134537364629312 metric_logger.py:196] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.154, Tokens/s/device: 13890.490, total_weights: 65536, loss: 8.892, lm_loss: 8.892, perplexity: 7270.717
I0420 06:06:03.490737    2869 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0420 06:06:05.563695 134405335017216 array_metadata_store.py:203] [process=3][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_02_synthetic/checkpoints/0/items/array_metadatas/process_3
I0420 06:06:22.718634 134537364629312 metric_logger.py:196] completed step: 6, seconds: 0.296, TFLOP/s/device: 45.952, Tokens/s/device: 6926.313, total_weights: 65536, loss: 8.592, lm_loss: 8.592, perplexity: 5390.759
I0420 06:06:22.865889 134537364629312 metric_logger.py:196] completed step: 7, seconds: 21.433, TFLOP/s/device: 0.634, Tokens/s/device: 95.553, total_weights: 65536, loss: 8.384, lm_loss: 8.384, perplexity: 4376.905
I0420 06:06:23.013392 134537364629312 metric_logger.py:196] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.364, Tokens/s/device: 13469.962, total_weights: 65536, loss: 8.255, lm_loss: 8.255, perplexity: 3846.406
I0420 06:06:23.159990 134537364629312 checkpointing.py:772] Waiting for step 9 to finish before checkpoint...
I0420 06:06:23.160644 134537364629312 checkpointing.py:776] Waited 0.0006763935089111328 seconds for step 9 to finish before starting checkpointing.
I0420 06:06:23.162776 134537364629312 checkpoint_manager.py:2020] [process=3][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0420 06:06:37.396360 134408015165184 base_pytree_checkpoint_handler.py:130] [process=3] /jax/orbax/write/gbytes_per_sec: 41.672 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 37.90577483177185 s) (per-host)
I0420 06:06:37.396485 134408015165184 async_checkpointer.py:90] [process=3][thread=async_save] 3 Handler Commit operations completed. Time taken: 37.616556s.
I0420 06:06:47.372949 134408015165184 async_checkpointer.py:160] [process=3][thread=async_save] Background save thread done. Time taken: 47.593003s.
I0420 06:06:47.373171 134401551742720 async_checkpointer.py:288] [process=3][thread=save_finalize] Done with waiting for background save thread=async_save.
I0420 06:06:47.373242 134401551742720 async_checkpointer.py:298] [process=3][thread=save_finalize] No errors found in background save thread=async_save.
I0420 06:06:47.373292 134401551742720 checkpoint_manager.py:2137] [process=3][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0420 06:06:47.375020 134401551742720 checkpoint_manager.py:2146] [process=3][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0420 06:06:47.375234 134537364629312 checkpoint_manager.py:2032] [process=3][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0.
W0420 06:06:47.375392 134537364629312 checkpoint_manager.py:1452] Waiting for previous save to complete took 24.212615 seconds. If this number is high, consider checkpointing less frequently.
I0420 06:06:47.377159 134537364629312 checkpoint_manager.py:1512] [process=3] Saving checkpoint at step 9
I0420 06:06:47.379285 134537364629312 event_tracking.py:70] [process=3] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_02_synthetic/checkpoints/9.
I0420 06:06:48.073672 134537364629312 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0420 06:06:48.073765 134537364629312 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 06:06:48.109095 134537364629312 base_pytree_checkpoint_handler.py:154] [process=3][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.036632s
I0420 06:06:48.109268 134537364629312 base_pytree_checkpoint_handler.py:130] [process=3] /jax/orbax/write/blocking_gbytes_per_sec: 38.559 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.04000568389892578 s) (per-host)
I0420 06:06:48.109331 134537364629312 base_pytree_checkpoint_handler.py:768] [process=3][thread=MainThread] Initiated Pytree async_save. Time taken: 0.040078s (batch_requests_ready=0.001720s, total_serialization_initiated=0.038276s, others=0.000082s)
I0420 06:06:48.109419 134537364629312 composite_checkpoint_handler.py:715] [process=3][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.044291s (all_items=0.000015s, per_item={'items': '0.00001526'}, temp_paths=0.044276)
I0420 06:06:48.110059 134537364629312 event_tracking.py:125] [process=3] [async] Finished blocking save in 0.73 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_02_synthetic/checkpoints/9.
I0420 06:06:48.110407 134405335017216 async_checkpointer.py:76] [process=3][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 06:26:48.110371
I0420 06:06:48.115522 134537364629312 checkpoint_manager.py:1560] [process=3][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0420 06:06:48.115802 134401551742720 async_checkpointer.py:280] [process=3][thread=save_finalize] Waiting for background save thread=async_save.
I0420 06:06:48.115960 134537364629312 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_02_synthetic/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776665183.1627462, 'wait_for_prev_duration_secs': 24.21261477470398, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776665207.3771987, 'checkpointer_blocking_duration_secs': 0.7333498001098633, 'get_old_steps_start_time': 1776665208.110569, 'get_old_steps_duration_secs': 3.147125244140625e-05, 'checkpoint_manager_blocking_start_time': 1776665183.1608818, 'checkpoint_manager_blocking_duration_secs': 24.955042362213135}
I0420 06:06:48.116071 134537364629312 checkpointing.py:408] Started an asynchronous checkpoint save for step 9
I0420 06:06:48.116117 134537364629312 checkpoint_manager.py:2020] [process=3][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0420 06:06:54.069175 134408015165184 array_metadata_store.py:203] [process=3][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260420_060028/linen_xpk_main_20260420_060028_02_synthetic/checkpoints/9/items/array_metadatas/process_3
I0420 06:07:29.778391 134405335017216 base_pytree_checkpoint_handler.py:130] [process=3] /jax/orbax/write/gbytes_per_sec: 37.872 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 41.7090950012207 s) (per-host)
I0420 06:07:29.778497 134405335017216 async_checkpointer.py:90] [process=3][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.667977s.
I0420 06:07:40.600686 134405335017216 async_checkpointer.py:160] [process=3][thread=async_save] Background save thread done. Time taken: 52.490149s.
I0420 06:07:40.600949 134401551742720 async_checkpointer.py:288] [process=3][thread=save_finalize] Done with waiting for background save thread=async_save.
I0420 06:07:40.601093 134401551742720 async_checkpointer.py:298] [process=3][thread=save_finalize] No errors found in background save thread=async_save.
I0420 06:07:40.601161 134401551742720 checkpoint_manager.py:2137] [process=3][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0420 06:07:40.603692 134401551742720 checkpoint_manager.py:2146] [process=3][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0420 06:07:40.603893 134537364629312 checkpoint_manager.py:2032] [process=3][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9.
I0420 06:07:40.604041 134537364629312 checkpoint_manager.py:2009] [process=3][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0420 06:07:40.605084 134537364629312 metric_logger.py:196] completed step: 9, seconds: 0.148, TFLOP/s/device: 91.735, Tokens/s/device: 13827.281, 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: Mon Apr 20 06:07:48 UTC 2026
EXIT_CODE=0
test/pipeline-scan-nnx  ·  e27fc1e97  ·  test_pipeline_scan_nnx_20260421_005327  ·  full log 
XPK Start: Tue Apr 21 00:55:55 UTC 2026
2026-04-21 00:55:59.646339: 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 00:00:1776732959.658774      10 cuda_dnn.cc:8579] Unable to register cuDNN factory: Attempting to register factory for plugin cuDNN when one has already been registered
E0000 00:00:1776732959.662545      10 cuda_blas.cc:1407] Unable to register cuBLAS factory: Attempting to register factory for plugin cuBLAS when one has already been registered
W0000 00:00:1776732959.673763      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776732959.673781      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776732959.673783      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776732959.673785      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
2026-04-21 00:56:19.702174: 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)
I0421 00:56:20.218287 133749144426304 max_utils.py:273] Attempting to initialize the jax distributed system...
INFO:2026-04-21 00:56:29,259:jax._src.distributed:140: Starting JAX distributed service on [::]:8482
I0421 00:56:29.259041 133749144426304 distributed.py:140] Starting JAX distributed service on [::]:8482
INFO:2026-04-21 00:56:29,261:jax._src.distributed:157: Connecting to JAX distributed service on mt-02-synthetic-cyblh-slice-job-0-0.mt-02-synthetic-cyblh:8482
I0421 00:56:29.261466 133749144426304 distributed.py:157] Connecting to JAX distributed service on mt-02-synthetic-cyblh-slice-job-0-0.mt-02-synthetic-cyblh:8482
I0421 00:56:33.403550 133749144426304 max_utils.py:284] Jax distributed system initialized!
I0421 00:56:40.584766 133749144426304 max_utils.py:800] System Information: Jax Version: 0.8.1
I0421 00:56:40.584874 133749144426304 max_utils.py:801] System Information: Jaxlib Version: 0.8.1
I0421 00:56:40.584915 133749144426304 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
I0421 00:56:40.584949 133749144426304 train_utils.py:347] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0421 00:56:41.203385 133749144426304 maxtext_utils.py:1398] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0421 00:56:41.203691 133749144426304 checkpointing.py:677] Setting up checkpoint logger...
I0421 00:56:41.203748 133749144426304 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True
I0421 00:56:41.203792 133749144426304 pytree_checkpoint_handler.py:589] save_device_host_concurrent_bytes=None
I0421 00:56:41.204138 133749144426304 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 0x79a464575850>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0421 00:56:44.018169 133749144426304 checkpointing.py:265] Enabling policy for fixed interval checkpointing.
I0421 00:56:44.018408 133749144426304 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 0x798fd03bf4a0>}, handler_registry=None
I0421 00:56:44.018641 133749144426304 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x798fd03bf4a0>` 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`.
I0421 00:56:44.019068 133749144426304 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x798fd025ef60>` 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`.
I0421 00:56:44.019113 133749144426304 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 0x798fd03bf4a0>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x798fd03bf4a0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x798fd025ef60>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x798fd025ef60>}).
I0421 00:56:44.019626 133749144426304 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.33
I0421 00:56:44.019732 133749144426304 async_checkpointer.py:177] [process=7][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x798fd01b0040> timeout: 600 secs and primary_host=0 for async checkpoint writes
I0421 00:56:45.175342 133749144426304 checkpoint_manager.py:1818] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_02_synthetic/checkpoints
I0421 00:56:45.601497 133749144426304 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=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_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_02_synthetic/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x798fd03c3410>
I0421 00:56:45.601691 133749144426304 checkpointing.py:301] Checkpoint manager created!
I0421 00:56:46.522800 133749144426304 nnx_wrappers.py:453] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0421 00:56:46.522906 133749144426304 nnx_wrappers.py:453] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0421 00:56:46.900974 133749144426304 attentions.py:1084] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0421 00:56:46.901068 133749144426304 attentions.py:1084] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0421 00:56:46.916911 133749144426304 attentions.py:1085] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0421 00:56:46.916975 133749144426304 attentions.py:1085] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0421 00:56:46.939841 133749144426304 attentions.py:1150] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0421 00:56:46.939909 133749144426304 attentions.py:1150] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0421 00:56:46.955766 133749144426304 attentions.py:1151] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0421 00:56:46.955844 133749144426304 attentions.py:1151] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0421 00:56:46.971606 133749144426304 attentions.py:1152] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0421 00:56:46.971678 133749144426304 attentions.py:1152] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0421 00:56:46.996912 133749144426304 attentions.py:1193] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0421 00:56:46.996984 133749144426304 attentions.py:1193] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0421 00:56:47.017032 133749144426304 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0421 00:56:47.017098 133749144426304 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0421 00:56:47.211499 133749144426304 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint
I0421 00:56:47.211610 133749144426304 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0421 00:56:48.649093 133749144426304 maxtext_utils.py:1501]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   PartitionSpec('norm',)
    Physical:  (None,)
I0421 00:56:48.649222 133749144426304 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)
I0421 00:56:48.649275 133749144426304 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)
I0421 00:56:48.649339 133749144426304 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')
I0421 00:56:48.649393 133749144426304 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)
I0421 00:56:48.649434 133749144426304 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)
I0421 00:56:48.649488 133749144426304 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)
I0421 00:56:48.649542 133749144426304 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')
I0421 00:56:48.649583 133749144426304 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)
I0421 00:56:48.649621 133749144426304 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)
I0421 00:56:48.649685 133749144426304 maxtext_utils.py:1501]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   PartitionSpec('embed', 'vocab')
    Physical:  ('fsdp', None)
I0421 00:56:48.649739 133749144426304 maxtext_utils.py:1501]  params/params/token_embedder/embedding
    Shape:     float32[32000,2048]
    Logical:   PartitionSpec('vocab', 'embed')
    Physical:  (None, 'fsdp')

I0421 00:56:49.154534 133749144426304 train.py:156] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0421 00:56:49.154636 133749144426304 train.py:156] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0421 00:56:49.169732 133749144426304 train.py:163] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0421 00:56:49.169792 133749144426304 train.py:163] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0421 00:56:59.907587 133749144426304 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.
I0421 00:56:59.908555 133749144426304 metric_logger.py:289] number parameters: 1.104 billion
I0421 00:57:10.908541 133749144426304 checkpointing.py:772] Waiting for step 0 to finish before checkpoint...
I0421 00:57:11.064650 133749144426304 checkpointing.py:776] Waited 0.15608716011047363 seconds for step 0 to finish before starting checkpointing.
I0421 00:57:11.067098 133749144426304 checkpoint_manager.py:2013] [process=7][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0421 00:57:11.068900 133749144426304 checkpoint_manager.py:1518] [process=7] Saving checkpoint at step 0
I0421 00:57:11.071714 133749144426304 async_checkpointer.py:452] [process=7] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_02_synthetic/checkpoints/0.
I0421 00:57:12.098952 133749144426304 signaling_client.py:364] Using JaxDistributedSignalingClient
I0421 00:57:12.099991 133749144426304 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0421 00:57:12.100053 133749144426304 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
I0421 00:57:12.347357 133749144426304 base_pytree_checkpoint_handler.py:153] [process=7][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.248484s
I0421 00:57:12.347521 133749144426304 base_pytree_checkpoint_handler.py:129] [process=7] /jax/checkpoint/write/blocking_gbytes_per_sec: 2.942 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.5243709087371826 s) (per-host)
I0421 00:57:12.347570 133749144426304 base_pytree_checkpoint_handler.py:737] [process=7][thread=MainThread] Initiated Pytree async_save. Time taken: 0.524430s (batch_requests_ready=0.272318s, total_serialization_initiated=0.252045s, others=0.000067s)
I0421 00:57:12.347673 133749144426304 composite_checkpoint_handler.py:715] [process=7][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.528406s (all_items=0.000020s, per_item={'items': '0.00002003'}, temp_paths=0.528386)
I0421 00:57:12.348584 133625425164032 async_checkpointer.py:79] [process=7][thread=async_save] Background save thread started.
I0421 00:57:12.348725 133749144426304 async_checkpointer.py:561] Finished blocking save. Time taken: 1.279756s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_02_synthetic/checkpoints/0.
I0421 00:57:12.350720 133749144426304 checkpoint_manager.py:1566] [process=7][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0421 00:57:12.351007 133621088233216 async_checkpointer.py:265] [process=7][thread=save_finalize] Waiting for background save thread=async_save.
I0421 00:57:12.351166 133749144426304 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_02_synthetic/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776733031.0670798, 'wait_for_prev_duration_secs': 6.437301635742188e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776733031.0689392, 'checkpointer_blocking_duration_secs': 1.279966115951538, 'get_old_steps_start_time': 1776733032.3489244, 'get_old_steps_duration_secs': 3.147125244140625e-05, 'checkpoint_manager_blocking_start_time': 1776733031.0652778, 'checkpoint_manager_blocking_duration_secs': 1.2858526706695557}
I0421 00:57:12.351269 133749144426304 checkpointing.py:408] Started an asynchronous checkpoint save for step 0
I0421 00:57:12.351319 133749144426304 max_utils.py:750] 
Memstats: After params initialized:
I0421 00:57:12.351366 133749144426304 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_26(process=7,(2,6,0,0))
I0421 00:57:12.351400 133749144426304 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_27(process=7,(3,6,0,0))
I0421 00:57:12.351428 133749144426304 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_30(process=7,(2,7,0,0))
I0421 00:57:12.351452 133749144426304 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_31(process=7,(3,7,0,0))
I0421 00:57:12.619546 133749144426304 metric_logger.py:185] completed step: 0, seconds: 11.000, TFLOP/s/device: 1.235, Tokens/s/device: 186.184, total_weights: 65536, loss: 10.874
I0421 00:57:12.799881 133749144426304 metric_logger.py:185] completed step: 1, seconds: 1.710, TFLOP/s/device: 7.947, Tokens/s/device: 1197.873, total_weights: 65536, loss: 10.874
I0421 00:57:13.201306 133749144426304 metric_logger.py:185] completed step: 2, seconds: 0.033, TFLOP/s/device: 410.810, Tokens/s/device: 61921.751, total_weights: 65536, loss: 10.263
I0421 00:57:13.348789 133749144426304 metric_logger.py:185] completed step: 3, seconds: 0.402, TFLOP/s/device: 33.764, Tokens/s/device: 5089.299, total_weights: 65536, loss: 9.734
I0421 00:57:13.644369 133749144426304 metric_logger.py:185] completed step: 4, seconds: 0.152, TFLOP/s/device: 89.239, Tokens/s/device: 13451.030, total_weights: 65536, loss: 9.278
I0421 00:57:13.650179 133749144426304 metric_logger.py:185] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.184, Tokens/s/device: 13895.014, total_weights: 65536, loss: 8.892
I0421 00:57:32.837494 133749144426304 metric_logger.py:185] completed step: 6, seconds: 0.296, TFLOP/s/device: 45.906, Tokens/s/device: 6919.527, total_weights: 65536, loss: 8.592
I0421 00:57:32.985118 133749144426304 metric_logger.py:185] completed step: 7, seconds: 19.041, TFLOP/s/device: 0.714, Tokens/s/device: 107.559, total_weights: 65536, loss: 8.384
I0421 00:57:33.132551 133749144426304 metric_logger.py:185] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.374, Tokens/s/device: 13471.469, total_weights: 65536, loss: 8.255
I0421 00:57:33.279708 133749144426304 checkpointing.py:772] Waiting for step 9 to finish before checkpoint...
I0421 00:57:33.280357 133749144426304 checkpointing.py:776] Waited 0.0006949901580810547 seconds for step 9 to finish before starting checkpointing.
I0421 00:57:33.282460 133749144426304 checkpoint_manager.py:2024] [process=7][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0421 00:57:34.731688    2654 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0421 00:57:36.937423 133625911678720 array_metadata_store.py:203] [process=7][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_02_synthetic/checkpoints/0/items/array_metadatas/process_7
I0421 00:58:08.631091 133625425164032 base_pytree_checkpoint_handler.py:129] [process=7] /jax/checkpoint/write/gbytes_per_sec: 27.806 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 56.80789303779602 s) (per-host)
I0421 00:58:08.631199 133625425164032 async_checkpointer.py:90] [process=7][thread=async_save] 3 Handler Commit operations completed. Time taken: 56.282394s.
I0421 00:58:17.516386 133625425164032 async_checkpointer.py:144] [process=7][thread=async_save] Background save thread done. Time taken: 65.167564s.
I0421 00:58:17.516633 133621088233216 async_checkpointer.py:273] [process=7][thread=save_finalize] Done with waiting for background save thread=async_save.
I0421 00:58:17.516707 133621088233216 async_checkpointer.py:283] [process=7][thread=save_finalize] No errors found in background save thread=async_save.
I0421 00:58:17.516767 133621088233216 checkpoint_manager.py:2133] [process=7][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0421 00:58:17.518350 133621088233216 checkpoint_manager.py:2142] [process=7][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0421 00:58:17.518520 133749144426304 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.
W0421 00:58:17.518673 133749144426304 checkpoint_manager.py:1458] Waiting for previous save to complete took 44.236204 seconds. If this number is high, consider checkpointing less frequently.
I0421 00:58:17.520597 133749144426304 checkpoint_manager.py:1518] [process=7] Saving checkpoint at step 9
I0421 00:58:17.524101 133749144426304 async_checkpointer.py:452] [process=7] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_02_synthetic/checkpoints/9.
I0421 00:58:18.080582 133749144426304 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0421 00:58:18.080703 133749144426304 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
I0421 00:58:18.126750 133749144426304 base_pytree_checkpoint_handler.py:153] [process=7][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.047339s
I0421 00:58:18.126923 133749144426304 base_pytree_checkpoint_handler.py:129] [process=7] /jax/checkpoint/write/blocking_gbytes_per_sec: 5.050 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.3054392337799072 s) (per-host)
I0421 00:58:18.126983 133749144426304 base_pytree_checkpoint_handler.py:737] [process=7][thread=MainThread] Initiated Pytree async_save. Time taken: 0.305510s (batch_requests_ready=0.256232s, total_serialization_initiated=0.049198s, others=0.000079s)
I0421 00:58:18.127074 133749144426304 composite_checkpoint_handler.py:715] [process=7][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.309612s (all_items=0.000015s, per_item={'items': '0.00001502'}, temp_paths=0.309597)
I0421 00:58:18.127946 133622203938560 async_checkpointer.py:79] [process=7][thread=async_save] Background save thread started.
I0421 00:58:18.128130 133749144426304 async_checkpointer.py:561] Finished blocking save. Time taken: 0.607465s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_02_synthetic/checkpoints/9.
I0421 00:58:18.531856 133749144426304 checkpoint_manager.py:1566] [process=7][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0421 00:58:18.532278 133621088233216 async_checkpointer.py:265] [process=7][thread=save_finalize] Waiting for background save thread=async_save.
I0421 00:58:18.532476 133749144426304 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_02_synthetic/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776733053.282432, 'wait_for_prev_duration_secs': 44.23620367050171, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776733097.5206378, 'checkpointer_blocking_duration_secs': 0.6076095104217529, 'get_old_steps_start_time': 1776733098.1282666, 'get_old_steps_duration_secs': 2.5033950805664062e-05, 'checkpoint_manager_blocking_start_time': 1776733053.280577, 'checkpoint_manager_blocking_duration_secs': 45.25186228752136}
I0421 00:58:18.532584 133749144426304 checkpointing.py:408] Started an asynchronous checkpoint save for step 9
I0421 00:58:18.532640 133749144426304 checkpoint_manager.py:2024] [process=7][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0421 00:58:24.155755 133625911678720 array_metadata_store.py:203] [process=7][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_test_pipeline_scan_nnx_20260421_005327/linen_xpk_test_pipeline_scan_nnx_20260421_005327_02_synthetic/checkpoints/9/items/array_metadatas/process_7
I0421 00:59:01.148279 133622203938560 base_pytree_checkpoint_handler.py:129] [process=7] /jax/checkpoint/write/gbytes_per_sec: 36.458 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 43.32675552368164 s) (per-host)
I0421 00:59:01.148407 133622203938560 async_checkpointer.py:90] [process=7][thread=async_save] 3 Handler Commit operations completed. Time taken: 43.020340s.
I0421 00:59:08.428382 133622203938560 async_checkpointer.py:144] [process=7][thread=async_save] Background save thread done. Time taken: 50.300300s.
I0421 00:59:08.428605 133621088233216 async_checkpointer.py:273] [process=7][thread=save_finalize] Done with waiting for background save thread=async_save.
I0421 00:59:08.428717 133621088233216 async_checkpointer.py:283] [process=7][thread=save_finalize] No errors found in background save thread=async_save.
I0421 00:59:08.428777 133621088233216 checkpoint_manager.py:2133] [process=7][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0421 00:59:08.431391 133621088233216 checkpoint_manager.py:2142] [process=7][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0421 00:59:08.431568 133749144426304 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.
I0421 00:59:08.431734 133749144426304 checkpoint_manager.py:2013] [process=7][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0421 00:59:08.432425 133749144426304 metric_logger.py:185] completed step: 9, seconds: 0.148, TFLOP/s/device: 92.067, Tokens/s/device: 13877.407, 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: Tue Apr 21 00:59:20 UTC 2026
EXIT_CODE=0