MaxView

Timing Test Reference Updates
‹ 09_pdb_lt_1Case: 10_shardy_false11_optimizer_offload_true ›

Metrics: Linen vs NNX  ·  feat/nnx-set-defaults-true

MetricLinen  73213e044NNX  73213e044Diff (NNX − Linen)
Parameters1.104 billion1.104 billion—
Final loss8.17908.1750-0.004
TFLOP/s92.24592.974+0.729
Tok/s13904.214014.1+109.891
Avg s/step2.3852.537+0.152
Memory %1.381.380
JAX0.8.10.8.1—

Diff = NNX value − Linen value. Green = NNX improved. Red = NNX regressed.

Linen  ·  73213e044  ·  feat_nnx_set_defaults_true_20260425_150412  ·  full log 
XPK Start: Sat Apr 25 15:34:48 UTC 2026
2026-04-25 15:34:52.826752: 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 00:00:1777131292.839714      10 cuda_dnn.cc:8579] Unable to register cuDNN factory: Attempting to register factory for plugin cuDNN when one has already been registered
E0000 00:00:1777131292.843679      10 cuda_blas.cc:1407] Unable to register cuBLAS factory: Attempting to register factory for plugin cuBLAS when one has already been registered
W0000 00:00:1777131292.855151      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1777131292.855170      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1777131292.855173      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1777131292.855174      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
2026-04-25 15:35:11.997696: 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)
I0425 15:35:12.530410 138886580102976 max_utils.py:273] Attempting to initialize the jax distributed system...
INFO:2026-04-25 15:35:21,570:jax._src.distributed:140: Starting JAX distributed service on [::]:8482
I0425 15:35:21.570865 138886580102976 distributed.py:140] Starting JAX distributed service on [::]:8482
INFO:2026-04-25 15:35:21,573:jax._src.distributed:157: Connecting to JAX distributed service on mt-10-shardy-false-w1hfk-slice-job-0-0.mt-10-shardy-false-w1hfk:8482
I0425 15:35:21.573333 138886580102976 distributed.py:157] Connecting to JAX distributed service on mt-10-shardy-false-w1hfk-slice-job-0-0.mt-10-shardy-false-w1hfk:8482
I0425 15:35:22.741552 138886580102976 max_utils.py:284] Jax distributed system initialized!
I0425 15:35:29.835371 138886580102976 max_utils.py:800] System Information: Jax Version: 0.8.1
I0425 15:35:29.835476 138886580102976 max_utils.py:801] System Information: Jaxlib Version: 0.8.1
I0425 15:35:29.835515 138886580102976 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
I0425 15:35:29.835548 138886580102976 train_utils.py:377] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0425 15:35:30.461810 138886580102976 maxtext_utils.py:1631] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0425 15:35:30.462419 138886580102976 maxtext_utils.py:1631] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0425 15:35:30.462600 138886580102976 checkpointing.py:688] Setting up checkpoint logger...
I0425 15:35:30.462651 138886580102976 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True
I0425 15:35:30.462694 138886580102976 pytree_checkpoint_handler.py:589] save_device_host_concurrent_bytes=None
I0425 15:35:30.463039 138886580102976 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 0x7e5095f71310>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0425 15:35:33.326255 138886580102976 checkpointing.py:266] Enabling policy for fixed interval checkpointing.
I0425 15:35:33.326610 138886580102976 checkpoint_manager.py:709] [process=6][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7e3c004a8440>}, handler_registry=None
I0425 15:35:33.326844 138886580102976 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7e3c004a8440>` 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`.
I0425 15:35:33.326893 138886580102976 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e3c002b58b0>` 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`.
I0425 15:35:33.326930 138886580102976 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 0x7e3c004a8440>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7e3c004a8440>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e3c002b58b0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e3c002b58b0>}).
I0425 15:35:33.327469 138886580102976 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.33
I0425 15:35:33.327550 138886580102976 async_checkpointer.py:177] [process=6][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7e3c00218180> timeout: 600 secs and primary_host=0 for async checkpoint writes
I0425 15:35:35.774960 138886580102976 checkpoint_manager.py:1818] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/linen_xpk_feat_nnx_set_defaults_true_20260425_150412_10_shardy_false/checkpoints
I0425 15:35:36.202451 138886580102976 checkpoint_manager.py:929] [process=6][thread=MainThread] CheckpointManager created,  primary_host=0, CheckpointManagerOptions=CheckpointManagerOptions(save_interval_steps=1, max_to_keep=None, keep_time_interval=None, keep_period=None, should_keep_fn=None, best_fn=None, best_mode='max', keep_checkpoints_without_metrics=True, step_prefix=None, step_format_fixed_length=None, step_name_format=None, create=True, cleanup_tmp_directories=False, save_on_steps=frozenset(), single_host_load_and_broadcast=False, todelete_subdir=None, todelete_full_path=None, enable_background_delete=False, read_only=False, enable_async_checkpointing=True, async_options=None, multiprocessing_options=MultiprocessingOptions(primary_host=0, active_processes=None, barrier_sync_key_prefix=None), should_save_fn=None, file_options=FileOptions(path_permission_mode=None), save_root_metadata=True, temporary_path_class=None, save_decision_policy=FixedIntervalPolicy(interval=10), preservation_policy=LatestN(n=None), prevent_write_metrics=False, enable_should_save_is_saving_in_progress_check=True, enable_per_process_directory_creation=False, lightweight_initialize=False), root_directory=gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/linen_xpk_feat_nnx_set_defaults_true_20260425_150412_10_shardy_false/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7e3c00542900>
I0425 15:35:36.202628 138886580102976 checkpointing.py:302] Checkpoint manager created!
I0425 15:35:37.104871 138886580102976 nnx_wrappers.py:455] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0425 15:35:37.104979 138886580102976 nnx_wrappers.py:455] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0425 15:35:37.474511 138886580102976 attentions.py:1084] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0425 15:35:37.474605 138886580102976 attentions.py:1084] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0425 15:35:37.490487 138886580102976 attentions.py:1085] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0425 15:35:37.490551 138886580102976 attentions.py:1085] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0425 15:35:37.513448 138886580102976 attentions.py:1150] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0425 15:35:37.513522 138886580102976 attentions.py:1150] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0425 15:35:37.529491 138886580102976 attentions.py:1151] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0425 15:35:37.529559 138886580102976 attentions.py:1151] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0425 15:35:37.545424 138886580102976 attentions.py:1152] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0425 15:35:37.545488 138886580102976 attentions.py:1152] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0425 15:35:37.570312 138886580102976 attentions.py:1193] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0425 15:35:37.570384 138886580102976 attentions.py:1193] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0425 15:35:37.590017 138886580102976 linears.py:541] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0425 15:35:37.590090 138886580102976 linears.py:541] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0425 15:35:37.780024 138886580102976 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint
I0425 15:35:37.780152 138886580102976 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0425 15:35:39.188023 138886580102976 maxtext_utils.py:1740]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   PartitionSpec('norm',)
    Physical:  (None,)
I0425 15:35:39.188167 138886580102976 maxtext_utils.py:1740]  params/params/decoder/layers/mlp/wi_0/kernel
    Shape:     float32[2048,16,7168]
    Logical:   PartitionSpec('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0425 15:35:39.188223 138886580102976 maxtext_utils.py:1740]  params/params/decoder/layers/mlp/wi_1/kernel
    Shape:     float32[2048,16,7168]
    Logical:   PartitionSpec('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0425 15:35:39.188286 138886580102976 maxtext_utils.py:1740]  params/params/decoder/layers/mlp/wo/kernel
    Shape:     float32[7168,16,2048]
    Logical:   PartitionSpec('mlp', 'layers', 'embed')
    Physical:  (None, None, 'fsdp')
I0425 15:35:39.188341 138886580102976 maxtext_utils.py:1740]  params/params/decoder/layers/post_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   PartitionSpec('norm', 'layers')
    Physical:  (None, None)
I0425 15:35:39.188378 138886580102976 maxtext_utils.py:1740]  params/params/decoder/layers/pre_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   PartitionSpec('norm', 'layers')
    Physical:  (None, None)
I0425 15:35:39.188429 138886580102976 maxtext_utils.py:1740]  params/params/decoder/layers/self_attention/key/kernel
    Shape:     float32[2048,16,16,128]
    Logical:   PartitionSpec('embed', 'layers', 'kv_heads', 'kv_head_dim')
    Physical:  ('fsdp', None, None, None)
I0425 15:35:39.188480 138886580102976 maxtext_utils.py:1740]  params/params/decoder/layers/self_attention/out/kernel
    Shape:     float32[16,16,128,2048]
    Logical:   PartitionSpec('heads', 'layers', 'kv', 'embed')
    Physical:  (None, None, None, 'fsdp')
I0425 15:35:39.188520 138886580102976 maxtext_utils.py:1740]  params/params/decoder/layers/self_attention/query/kernel
    Shape:     float32[2048,16,16,128]
    Logical:   PartitionSpec('embed', 'layers', 'q_heads', 'kv')
    Physical:  ('fsdp', None, None, None)
I0425 15:35:39.188558 138886580102976 maxtext_utils.py:1740]  params/params/decoder/layers/self_attention/value/kernel
    Shape:     float32[2048,16,16,128]
    Logical:   PartitionSpec('embed', 'layers', 'kv_heads', 'kv_head_dim')
    Physical:  ('fsdp', None, None, None)
I0425 15:35:39.188606 138886580102976 maxtext_utils.py:1740]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   PartitionSpec('embed', 'vocab')
    Physical:  ('fsdp', None)

I0425 15:35:39.188652 138886580102976 maxtext_utils.py:1740]  params/params/token_embedder/embedding
    Shape:     float32[32000,2048]
    Logical:   PartitionSpec('vocab', 'embed')
    Physical:  (None, 'fsdp')
I0425 15:35:39.689629 138886580102976 train.py:158] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0425 15:35:39.689722 138886580102976 train.py:158] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0425 15:35:39.704816 138886580102976 train.py:165] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0425 15:35:39.704875 138886580102976 train.py:165] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0425 15:35:50.726926 138886580102976 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.
I0425 15:35:50.727874 138886580102976 metric_logger.py:289] number parameters: 1.104 billion
I0425 15:36:01.868975 138886580102976 checkpointing.py:794] Waiting for step 0 to finish before checkpoint...
I0425 15:36:02.023029 138886580102976 checkpointing.py:798] Waited 0.1540384292602539 seconds for step 0 to finish before starting checkpointing.
I0425 15:36:02.026064 138886580102976 checkpoint_manager.py:2013] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0425 15:36:02.027849 138886580102976 checkpoint_manager.py:1518] [process=6] Saving checkpoint at step 0
I0425 15:36:02.030665 138886580102976 async_checkpointer.py:452] [process=6] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/linen_xpk_feat_nnx_set_defaults_true_20260425_150412_10_shardy_false/checkpoints/0.
I0425 15:36:02.611107 138886580102976 signaling_client.py:364] Using JaxDistributedSignalingClient
I0425 15:36:02.612352 138886580102976 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0425 15:36:02.612411 138886580102976 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
I0425 15:36:02.861610 138886580102976 base_pytree_checkpoint_handler.py:153] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.250597s
I0425 15:36:02.861783 138886580102976 base_pytree_checkpoint_handler.py:129] [process=6] /jax/checkpoint/write/blocking_gbytes_per_sec: 3.073 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.5019736289978027 s) (per-host)
I0425 15:36:02.861832 138886580102976 base_pytree_checkpoint_handler.py:737] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.502032s (batch_requests_ready=0.247516s, total_serialization_initiated=0.254450s, others=0.000066s)
I0425 15:36:02.861920 138886580102976 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.506516s (all_items=0.000019s, per_item={'items': '0.00001860'}, temp_paths=0.506498)
I0425 15:36:02.862877 138761040492288 async_checkpointer.py:79] [process=6][thread=async_save] Background save thread started.
I0425 15:36:02.863043 138886580102976 async_checkpointer.py:561] Finished blocking save. Time taken: 0.835124s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/linen_xpk_feat_nnx_set_defaults_true_20260425_150412_10_shardy_false/checkpoints/0.
I0425 15:36:02.905719 138886580102976 checkpoint_manager.py:1566] [process=6][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0425 15:36:02.906042 138759538448128 async_checkpointer.py:265] [process=6][thread=save_finalize] Waiting for background save thread=async_save.
I0425 15:36:02.906208 138886580102976 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/linen_xpk_feat_nnx_set_defaults_true_20260425_150412_10_shardy_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1777131362.0260453, 'wait_for_prev_duration_secs': 7.724761962890625e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1777131362.0278883, 'checkpointer_blocking_duration_secs': 0.8352851867675781, 'get_old_steps_start_time': 1777131362.8631933, 'get_old_steps_duration_secs': 2.6702880859375e-05, 'checkpoint_manager_blocking_start_time': 1777131362.023659, 'checkpoint_manager_blocking_duration_secs': 0.8825082778930664}
I0425 15:36:02.906315 138886580102976 checkpointing.py:409] Started an asynchronous checkpoint save for step 0
I0425 15:36:02.906367 138886580102976 max_utils.py:750] 
Memstats: After params initialized:
I0425 15:36:02.906420 138886580102976 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_24(process=6,(0,6,0,0))
I0425 15:36:02.906454 138886580102976 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_25(process=6,(1,6,0,0))
I0425 15:36:02.906481 138886580102976 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_28(process=6,(0,7,0,0))
I0425 15:36:02.906506 138886580102976 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_29(process=6,(1,7,0,0))
I0425 15:36:03.167169 138886580102976 metric_logger.py:185] completed step: 0, seconds: 11.141, TFLOP/s/device: 1.220, Tokens/s/device: 183.826, total_weights: 65536, loss: 10.874
I0425 15:36:03.354977 138886580102976 metric_logger.py:185] completed step: 1, seconds: 1.297, TFLOP/s/device: 10.477, Tokens/s/device: 1579.180, total_weights: 65536, loss: 10.874
I0425 15:36:03.764145 138886580102976 metric_logger.py:185] completed step: 2, seconds: 0.041, TFLOP/s/device: 334.197, Tokens/s/device: 50373.869, total_weights: 65536, loss: 10.263
I0425 15:36:03.911366 138886580102976 metric_logger.py:185] completed step: 3, seconds: 0.409, TFLOP/s/device: 33.217, Tokens/s/device: 5006.772, total_weights: 65536, loss: 9.734
I0425 15:36:04.207252 138886580102976 metric_logger.py:185] completed step: 4, seconds: 0.153, TFLOP/s/device: 88.716, Tokens/s/device: 13372.249, total_weights: 65536, loss: 9.278
I0425 15:36:04.213106 138886580102976 metric_logger.py:185] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.219, Tokens/s/device: 13900.201, total_weights: 65536, loss: 8.892
I0425 15:36:23.181653 138886580102976 metric_logger.py:185] completed step: 6, seconds: 0.296, TFLOP/s/device: 45.856, Tokens/s/device: 6911.960, total_weights: 65536, loss: 8.592
I0425 15:36:23.329195 138886580102976 metric_logger.py:185] completed step: 7, seconds: 18.822, TFLOP/s/device: 0.722, Tokens/s/device: 108.809, total_weights: 65536, loss: 8.384
I0425 15:36:23.476637 138886580102976 metric_logger.py:185] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.237, Tokens/s/device: 13450.765, total_weights: 65536, loss: 8.255
I0425 15:36:23.623718 138886580102976 checkpointing.py:794] Waiting for step 9 to finish before checkpoint...
I0425 15:36:23.624413 138886580102976 checkpointing.py:798] Waited 0.0007150173187255859 seconds for step 9 to finish before starting checkpointing.
I0425 15:36:23.626439 138886580102976 checkpoint_manager.py:2024] [process=6][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0425 15:36:24.588225    2751 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0425 15:36:26.485158 138761048884992 array_metadata_store.py:203] [process=6][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/linen_xpk_feat_nnx_set_defaults_true_20260425_150412_10_shardy_false/checkpoints/0/items/array_metadatas/process_6
I0425 15:36:57.888005 138761040492288 base_pytree_checkpoint_handler.py:129] [process=6] /jax/checkpoint/write/gbytes_per_sec: 28.447 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 55.52816462516785 s) (per-host)
I0425 15:36:57.888139 138761040492288 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 55.025151s.
I0425 15:37:07.422568 138761040492288 async_checkpointer.py:144] [process=6][thread=async_save] Background save thread done. Time taken: 64.559563s.
I0425 15:37:07.422857 138759538448128 async_checkpointer.py:273] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save.
I0425 15:37:07.422985 138759538448128 async_checkpointer.py:283] [process=6][thread=save_finalize] No errors found in background save thread=async_save.
I0425 15:37:07.423034 138759538448128 checkpoint_manager.py:2133] [process=6][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0425 15:37:07.424651 138759538448128 checkpoint_manager.py:2142] [process=6][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0425 15:37:07.424828 138886580102976 checkpoint_manager.py:2036] [process=6][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0.
W0425 15:37:07.424963 138886580102976 checkpoint_manager.py:1458] Waiting for previous save to complete took 43.798530 seconds. If this number is high, consider checkpointing less frequently.
I0425 15:37:07.426747 138886580102976 checkpoint_manager.py:1518] [process=6] Saving checkpoint at step 9
I0425 15:37:07.430041 138886580102976 async_checkpointer.py:452] [process=6] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/linen_xpk_feat_nnx_set_defaults_true_20260425_150412_10_shardy_false/checkpoints/9.
I0425 15:37:07.954673 138886580102976 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0425 15:37:07.954773 138886580102976 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
I0425 15:37:08.003636 138886580102976 base_pytree_checkpoint_handler.py:153] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.050134s
I0425 15:37:08.003803 138886580102976 base_pytree_checkpoint_handler.py:129] [process=6] /jax/checkpoint/write/blocking_gbytes_per_sec: 5.158 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2990453243255615 s) (per-host)
I0425 15:37:08.003853 138886580102976 base_pytree_checkpoint_handler.py:737] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.299104s (batch_requests_ready=0.247049s, total_serialization_initiated=0.051990s, others=0.000066s)
I0425 15:37:08.003942 138886580102976 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.303339s (all_items=0.000015s, per_item={'items': '0.00001454'}, temp_paths=0.303325)
I0425 15:37:08.004868 138759552804608 async_checkpointer.py:79] [process=6][thread=async_save] Background save thread started.
I0425 15:37:08.005026 138886580102976 async_checkpointer.py:561] Finished blocking save. Time taken: 0.578207s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/linen_xpk_feat_nnx_set_defaults_true_20260425_150412_10_shardy_false/checkpoints/9.
I0425 15:37:08.213632 138886580102976 checkpoint_manager.py:1566] [process=6][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0425 15:37:08.214003 138759538448128 async_checkpointer.py:265] [process=6][thread=save_finalize] Waiting for background save thread=async_save.
I0425 15:37:08.214154 138886580102976 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/linen_xpk_feat_nnx_set_defaults_true_20260425_150412_10_shardy_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1777131383.6264095, 'wait_for_prev_duration_secs': 43.798529624938965, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1777131427.4267857, 'checkpointer_blocking_duration_secs': 0.5783681869506836, 'get_old_steps_start_time': 1777131428.0051732, 'get_old_steps_duration_secs': 2.47955322265625e-05, 'checkpoint_manager_blocking_start_time': 1777131383.6246507, 'checkpoint_manager_blocking_duration_secs': 44.589465618133545}
I0425 15:37:08.214322 138886580102976 checkpointing.py:409] Started an asynchronous checkpoint save for step 9
I0425 15:37:08.214372 138886580102976 checkpoint_manager.py:2024] [process=6][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0425 15:37:12.744585 138761048884992 array_metadata_store.py:203] [process=6][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/linen_xpk_feat_nnx_set_defaults_true_20260425_150412_10_shardy_false/checkpoints/9/items/array_metadatas/process_6
I0425 15:37:48.890293 138759552804608 base_pytree_checkpoint_handler.py:129] [process=6] /jax/checkpoint/write/gbytes_per_sec: 38.353 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 41.18549418449402 s) (per-host)
I0425 15:37:48.890413 138759552804608 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 40.885436s.
I0425 15:37:57.568114 138759552804608 async_checkpointer.py:144] [process=6][thread=async_save] Background save thread done. Time taken: 49.563106s.
I0425 15:37:57.568404 138759538448128 async_checkpointer.py:273] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save.
I0425 15:37:57.568522 138759538448128 async_checkpointer.py:283] [process=6][thread=save_finalize] No errors found in background save thread=async_save.
I0425 15:37:57.568568 138759538448128 checkpoint_manager.py:2133] [process=6][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0425 15:37:57.569983 138759538448128 checkpoint_manager.py:2142] [process=6][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0425 15:37:57.570162 138886580102976 checkpoint_manager.py:2036] [process=6][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9.
I0425 15:37:57.570311 138886580102976 checkpoint_manager.py:2013] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0425 15:37:57.570935 138886580102976 metric_logger.py:185] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.245, Tokens/s/device: 13904.164, 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: Sat Apr 25 15:38:09 UTC 2026
EXIT_CODE=0
NNX  ·  73213e044  ·  feat_nnx_set_defaults_true_20260425_150412  ·  full log 
XPK Start: Sat Apr 25 17:03:35 UTC 2026
2026-04-25 17:03:39.689535: 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 00:00:1777136619.702076      10 cuda_dnn.cc:8579] Unable to register cuDNN factory: Attempting to register factory for plugin cuDNN when one has already been registered
E0000 00:00:1777136619.705788      10 cuda_blas.cc:1407] Unable to register cuBLAS factory: Attempting to register factory for plugin cuBLAS when one has already been registered
W0000 00:00:1777136619.716905      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1777136619.716923      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1777136619.716926      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1777136619.716928      10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
2026-04-25 17:03:58.816442: 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)
I0425 17:03:59.349364 136762627626816 max_utils.py:273] Attempting to initialize the jax distributed system...
INFO:2026-04-25 17:04:08,390:jax._src.distributed:140: Starting JAX distributed service on [::]:8482
I0425 17:04:08.390413 136762627626816 distributed.py:140] Starting JAX distributed service on [::]:8482
INFO:2026-04-25 17:04:08,392:jax._src.distributed:157: Connecting to JAX distributed service on mt-10-shardy-false-9llv1-slice-job-0-0.mt-10-shardy-false-9llv1:8482
I0425 17:04:08.392697 136762627626816 distributed.py:157] Connecting to JAX distributed service on mt-10-shardy-false-9llv1-slice-job-0-0.mt-10-shardy-false-9llv1:8482
I0425 17:04:09.529534 136762627626816 max_utils.py:284] Jax distributed system initialized!
I0425 17:04:16.570533 136762627626816 max_utils.py:800] System Information: Jax Version: 0.8.1
I0425 17:04:16.570639 136762627626816 max_utils.py:801] System Information: Jaxlib Version: 0.8.1
I0425 17:04:16.570701 136762627626816 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
I0425 17:04:16.570737 136762627626816 train_utils.py:377] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0425 17:04:17.192847 136762627626816 maxtext_utils.py:1631] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0425 17:04:17.307352 136762627626816 checkpointing.py:688] Setting up checkpoint logger...
I0425 17:04:17.307471 136762627626816 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True
I0425 17:04:17.307517 136762627626816 pytree_checkpoint_handler.py:589] save_device_host_concurrent_bytes=None
I0425 17:04:17.307734 136762627626816 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 0x7c62037791f0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0425 17:04:20.222147 136762627626816 checkpointing.py:266] Enabling policy for fixed interval checkpointing.
I0425 17:04:20.222451 136762627626816 checkpoint_manager.py:709] [process=5][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7c4d7040dc70>}, handler_registry=None
I0425 17:04:20.222703 136762627626816 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7c4d7040dc70>` 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`.
I0425 17:04:20.222754 136762627626816 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7c4d7028ff50>` 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`.
I0425 17:04:20.222790 136762627626816 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 0x7c4d7040dc70>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7c4d7040dc70>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7c4d7028ff50>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7c4d7028ff50>}).
I0425 17:04:20.223125 136762627626816 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.33
I0425 17:04:20.223207 136762627626816 async_checkpointer.py:177] [process=5][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7c4d70208f40> timeout: 600 secs and primary_host=0 for async checkpoint writes
I0425 17:04:21.396381 136762627626816 checkpoint_manager.py:1818] Found 0 checkpoint steps in gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/nnx_xpk_feat_nnx_set_defaults_true_20260425_150412_10_shardy_false/checkpoints
I0425 17:04:21.499697 136762627626816 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/nnx_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/nnx_xpk_feat_nnx_set_defaults_true_20260425_150412_10_shardy_false/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7c4da84a3d10>
I0425 17:04:21.499870 136762627626816 checkpointing.py:302] Checkpoint manager created!
I0425 17:04:22.426495 136762627626816 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint
I0425 17:04:22.426618 136762627626816 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0425 17:04:23.789947 136762627626816 maxtext_utils.py:1749]  decoder/decoder_norm/scale/value
    Shape:     float32[2048]
    Physical:  (None,)
I0425 17:04:23.790070 136762627626816 maxtext_utils.py:1749]  decoder/layers/mlp/wi_0/kernel/value
    Shape:     float32[2048,16,7168]
    Physical:  ('fsdp', None, None)
I0425 17:04:23.790124 136762627626816 maxtext_utils.py:1749]  decoder/layers/mlp/wi_1/kernel/value
    Shape:     float32[2048,16,7168]
    Physical:  ('fsdp', None, None)
I0425 17:04:23.790168 136762627626816 maxtext_utils.py:1749]  decoder/layers/mlp/wo/kernel/value
    Shape:     float32[7168,16,2048]
    Physical:  (None, None, 'fsdp')
I0425 17:04:23.790210 136762627626816 maxtext_utils.py:1749]  decoder/layers/post_self_attention_layer_norm/scale/value
    Shape:     float32[2048,16]
    Physical:  (None, None)
I0425 17:04:23.790249 136762627626816 maxtext_utils.py:1749]  decoder/layers/pre_self_attention_layer_norm/scale/value
    Shape:     float32[2048,16]
    Physical:  (None, None)
I0425 17:04:23.790287 136762627626816 maxtext_utils.py:1749]  decoder/layers/self_attention/key/kernel/value
    Shape:     float32[2048,16,16,128]
    Physical:  ('fsdp', None, None, None)
I0425 17:04:23.790325 136762627626816 maxtext_utils.py:1749]  decoder/layers/self_attention/out/kernel/value
    Shape:     float32[16,16,128,2048]
    Physical:  (None, None, None, 'fsdp')
I0425 17:04:23.790360 136762627626816 maxtext_utils.py:1749]  decoder/layers/self_attention/query/kernel/value
    Shape:     float32[2048,16,16,128]
    Physical:  ('fsdp', None, None, None)
I0425 17:04:23.790394 136762627626816 maxtext_utils.py:1749]  decoder/layers/self_attention/value/kernel/value
    Shape:     float32[2048,16,16,128]
    Physical:  ('fsdp', None, None, None)
I0425 17:04:23.790428 136762627626816 maxtext_utils.py:1749]  decoder/logits_dense/kernel/value
    Shape:     float32[2048,32000]
    Physical:  ('fsdp', None)
I0425 17:04:23.790462 136762627626816 maxtext_utils.py:1749]  token_embedder/embedding/value
    Shape:     float32[32000,2048]
    Physical:  (None, 'fsdp')

I0425 17:04:24.188674 136762627626816 nnx_decoders.py:616] nnx_decoders/carry Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0425 17:04:24.188821 136762627626816 nnx_decoders.py:616] nnx_decoders/carry Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0425 17:04:24.194222 136762627626816 nnx_decoders.py:616] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0425 17:04:24.194319 136762627626816 nnx_decoders.py:616] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0425 17:04:24.345055 136762627626816 attentions.py:1084] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0425 17:04:24.345187 136762627626816 attentions.py:1084] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0425 17:04:24.494246 136762627626816 attentions.py:1085] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0425 17:04:24.494378 136762627626816 attentions.py:1085] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0425 17:04:24.652307 136762627626816 attentions.py:1150] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0425 17:04:24.652444 136762627626816 attentions.py:1150] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0425 17:04:24.795077 136762627626816 attentions.py:1151] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0425 17:04:24.795214 136762627626816 attentions.py:1151] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0425 17:04:24.935353 136762627626816 attentions.py:1152] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0425 17:04:24.935485 136762627626816 attentions.py:1152] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0425 17:04:25.086344 136762627626816 attentions.py:1193] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0425 17:04:25.086481 136762627626816 attentions.py:1193] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0425 17:04:25.109218 136762627626816 linears.py:541] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0425 17:04:25.109313 136762627626816 linears.py:541] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0425 17:04:36.314705 136762627626816 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.
I0425 17:04:36.317127 136762627626816 metric_logger.py:289] number parameters: 1.104 billion
I0425 17:04:47.437276 136762627626816 checkpointing.py:794] Waiting for step 0 to finish before checkpoint...
I0425 17:04:47.591905 136762627626816 checkpointing.py:798] Waited 0.1546187400817871 seconds for step 0 to finish before starting checkpointing.
I0425 17:04:47.594542 136762627626816 checkpoint_manager.py:2013] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0425 17:04:47.596173 136762627626816 checkpoint_manager.py:1518] [process=5] Saving checkpoint at step 0
I0425 17:04:47.598865 136762627626816 async_checkpointer.py:452] [process=5] Started async saving checkpoint to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/nnx_xpk_feat_nnx_set_defaults_true_20260425_150412_10_shardy_false/checkpoints/0.
I0425 17:04:48.613964 136762627626816 signaling_client.py:364] Using JaxDistributedSignalingClient
I0425 17:04:48.615095 136762627626816 jax_array_handlers.py:358] Scheduling D2H of 69 prioritized jax.Array.
I0425 17:04:48.615153 136762627626816 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
I0425 17:04:48.865868 136762627626816 base_pytree_checkpoint_handler.py:153] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.253016s
I0425 17:04:48.866052 136762627626816 base_pytree_checkpoint_handler.py:129] [process=5] /jax/checkpoint/write/blocking_gbytes_per_sec: 2.983 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.5171868801116943 s) (per-host)
I0425 17:04:48.866114 136762627626816 base_pytree_checkpoint_handler.py:737] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.517259s (batch_requests_ready=0.257130s, total_serialization_initiated=0.260048s, others=0.000081s)
I0425 17:04:48.866213 136762627626816 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.521233s (all_items=0.000019s, per_item={'items': '0.00001931'}, temp_paths=0.521214)
I0425 17:04:48.867229 136640441849600 async_checkpointer.py:79] [process=5][thread=async_save] Background save thread started.
I0425 17:04:48.867403 136762627626816 async_checkpointer.py:561] Finished blocking save. Time taken: 1.271152s. Continuing background save to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/nnx_xpk_feat_nnx_set_defaults_true_20260425_150412_10_shardy_false/checkpoints/0.
I0425 17:04:49.250418 136762627626816 checkpoint_manager.py:1566] [process=5][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0425 17:04:49.250841 136635635189504 async_checkpointer.py:265] [process=5][thread=save_finalize] Waiting for background save thread=async_save.
I0425 17:04:49.251009 136762627626816 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/nnx_xpk_feat_nnx_set_defaults_true_20260425_150412_10_shardy_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1777136687.5945244, 'wait_for_prev_duration_secs': 6.29425048828125e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1777136687.5962179, 'checkpointer_blocking_duration_secs': 1.2712953090667725, 'get_old_steps_start_time': 1777136688.8675323, 'get_old_steps_duration_secs': 2.6702880859375e-05, 'checkpoint_manager_blocking_start_time': 1777136687.592359, 'checkpoint_manager_blocking_duration_secs': 1.6586089134216309}
I0425 17:04:49.251123 136762627626816 checkpointing.py:409] Started an asynchronous checkpoint save for step 0
I0425 17:04:49.251200 136762627626816 max_utils.py:750] 
Memstats: After params initialized:
I0425 17:04:49.251255 136762627626816 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_18(process=5,(2,4,0,0))
I0425 17:04:49.251295 136762627626816 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_19(process=5,(3,4,0,0))
I0425 17:04:49.251323 136762627626816 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_22(process=5,(2,5,0,0))
I0425 17:04:49.251348 136762627626816 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_23(process=5,(3,5,0,0))
I0425 17:04:49.517400 136762627626816 metric_logger.py:185] completed step: 0, seconds: 11.119, TFLOP/s/device: 1.222, Tokens/s/device: 184.188, total_weights: 65536, loss: 10.874
I0425 17:04:49.698184 136762627626816 metric_logger.py:185] completed step: 1, seconds: 2.078, TFLOP/s/device: 6.538, Tokens/s/device: 985.411, total_weights: 65536, loss: 10.874
I0425 17:04:50.157299 136762627626816 metric_logger.py:185] completed step: 2, seconds: 0.035, TFLOP/s/device: 383.546, Tokens/s/device: 57812.279, total_weights: 65536, loss: 10.262
I0425 17:04:50.304844 136762627626816 metric_logger.py:185] completed step: 3, seconds: 0.450, TFLOP/s/device: 30.186, Tokens/s/device: 4549.918, total_weights: 65536, loss: 9.732
I0425 17:04:50.600497 136762627626816 metric_logger.py:185] completed step: 4, seconds: 0.162, TFLOP/s/device: 83.678, Tokens/s/device: 12612.857, total_weights: 65536, loss: 9.274
I0425 17:04:50.608733 136762627626816 metric_logger.py:185] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.281, Tokens/s/device: 13909.547, total_weights: 65536, loss: 8.888
I0425 17:05:10.118607 136762627626816 metric_logger.py:185] completed step: 6, seconds: 0.297, TFLOP/s/device: 45.773, Tokens/s/device: 6899.456, total_weights: 65536, loss: 8.589
I0425 17:05:10.265855 136762627626816 metric_logger.py:185] completed step: 7, seconds: 19.364, TFLOP/s/device: 0.702, Tokens/s/device: 105.764, total_weights: 65536, loss: 8.380
I0425 17:05:10.413322 136762627626816 metric_logger.py:185] completed step: 8, seconds: 0.154, TFLOP/s/device: 88.066, Tokens/s/device: 13274.308, total_weights: 65536, loss: 8.251
I0425 17:05:10.561825 136762627626816 checkpointing.py:794] Waiting for step 9 to finish before checkpoint...
I0425 17:05:10.562432 136762627626816 checkpointing.py:798] Waited 0.0006201267242431641 seconds for step 9 to finish before starting checkpointing.
I0425 17:05:10.564341 136762627626816 checkpoint_manager.py:2024] [process=5][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0425 17:05:11.027344    2617 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0425 17:05:12.972167 136640450242304 array_metadata_store.py:203] [process=5][thread=array_type_handler] Wrote 69 array_metadata.ArrayMetadata to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/nnx_xpk_feat_nnx_set_defaults_true_20260425_150412_10_shardy_false/checkpoints/0/items/array_metadatas/process_5
I0425 17:05:45.309754 136640441849600 base_pytree_checkpoint_handler.py:129] [process=5] /jax/checkpoint/write/gbytes_per_sec: 27.731 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 56.960835695266724 s) (per-host)
I0425 17:05:45.309863 136640441849600 async_checkpointer.py:90] [process=5][thread=async_save] 3 Handler Commit operations completed. Time taken: 56.442521s.
I0425 17:05:53.911672 136640441849600 async_checkpointer.py:144] [process=5][thread=async_save] Background save thread done. Time taken: 65.044301s.
I0425 17:05:53.911965 136635635189504 async_checkpointer.py:273] [process=5][thread=save_finalize] Done with waiting for background save thread=async_save.
I0425 17:05:53.912115 136635635189504 async_checkpointer.py:283] [process=5][thread=save_finalize] No errors found in background save thread=async_save.
I0425 17:05:53.912167 136635635189504 checkpoint_manager.py:2133] [process=5][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0425 17:05:53.914418 136635635189504 checkpoint_manager.py:2142] [process=5][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0425 17:05:53.914615 136762627626816 checkpoint_manager.py:2036] [process=5][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0.
W0425 17:05:53.914786 136762627626816 checkpoint_manager.py:1458] Waiting for previous save to complete took 43.350449 seconds. If this number is high, consider checkpointing less frequently.
I0425 17:05:53.916532 136762627626816 checkpoint_manager.py:1518] [process=5] Saving checkpoint at step 9
I0425 17:05:53.920085 136762627626816 async_checkpointer.py:452] [process=5] Started async saving checkpoint to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/nnx_xpk_feat_nnx_set_defaults_true_20260425_150412_10_shardy_false/checkpoints/9.
I0425 17:05:54.476629 136762627626816 jax_array_handlers.py:358] Scheduling D2H of 69 prioritized jax.Array.
I0425 17:05:54.476806 136762627626816 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
I0425 17:05:54.526833 136762627626816 base_pytree_checkpoint_handler.py:153] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.052276s
I0425 17:05:54.526998 136762627626816 base_pytree_checkpoint_handler.py:129] [process=5] /jax/checkpoint/write/blocking_gbytes_per_sec: 4.973 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.31020331382751465 s) (per-host)
I0425 17:05:54.527054 136762627626816 base_pytree_checkpoint_handler.py:737] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.310267s (batch_requests_ready=0.253230s, total_serialization_initiated=0.056966s, others=0.000071s)
I0425 17:05:54.527147 136762627626816 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.314176s (all_items=0.000015s, per_item={'items': '0.00001526'}, temp_paths=0.314160)
I0425 17:05:54.527983 136636725716736 async_checkpointer.py:79] [process=5][thread=async_save] Background save thread started.
I0425 17:05:54.528141 136762627626816 async_checkpointer.py:561] Finished blocking save. Time taken: 0.611537s. Continuing background save to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/nnx_xpk_feat_nnx_set_defaults_true_20260425_150412_10_shardy_false/checkpoints/9.
I0425 17:05:54.537451 136762627626816 checkpoint_manager.py:1566] [process=5][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0425 17:05:54.537700 136635635189504 async_checkpointer.py:265] [process=5][thread=save_finalize] Waiting for background save thread=async_save.
I0425 17:05:54.537826 136762627626816 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/nnx_xpk_feat_nnx_set_defaults_true_20260425_150412_10_shardy_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1777136710.564314, 'wait_for_prev_duration_secs': 43.35044884681702, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1777136753.9165707, 'checkpointer_blocking_duration_secs': 0.6116831302642822, 'get_old_steps_start_time': 1777136754.5282724, 'get_old_steps_duration_secs': 3.218650817871094e-05, 'checkpoint_manager_blocking_start_time': 1777136710.5626693, 'checkpoint_manager_blocking_duration_secs': 43.97512125968933}
I0425 17:05:54.537937 136762627626816 checkpointing.py:409] Started an asynchronous checkpoint save for step 9
I0425 17:05:54.537982 136762627626816 checkpoint_manager.py:2024] [process=5][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0425 17:05:59.455670 136640450242304 array_metadata_store.py:203] [process=5][thread=array_type_handler] Wrote 69 array_metadata.ArrayMetadata to gs://lance-maxtext/nnx_ckpt_xpk_feat_nnx_set_defaults_true_20260425_150412/nnx_xpk_feat_nnx_set_defaults_true_20260425_150412_10_shardy_false/checkpoints/9/items/array_metadatas/process_5
I0425 17:06:36.679471 136636725716736 base_pytree_checkpoint_handler.py:129] [process=5] /jax/checkpoint/write/gbytes_per_sec: 37.200 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.46263670921326 s) (per-host)
I0425 17:06:36.679588 136636725716736 async_checkpointer.py:90] [process=5][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.151495s.
I0425 17:06:43.665688 136636725716736 async_checkpointer.py:144] [process=5][thread=async_save] Background save thread done. Time taken: 49.137578s.
I0425 17:06:43.665907 136635635189504 async_checkpointer.py:273] [process=5][thread=save_finalize] Done with waiting for background save thread=async_save.
I0425 17:06:43.665964 136635635189504 async_checkpointer.py:283] [process=5][thread=save_finalize] No errors found in background save thread=async_save.
I0425 17:06:43.666018 136635635189504 checkpoint_manager.py:2133] [process=5][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0425 17:06:43.668874 136635635189504 checkpoint_manager.py:2142] [process=5][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0425 17:06:43.669106 136762627626816 checkpoint_manager.py:2036] [process=5][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9.
I0425 17:06:43.669276 136762627626816 checkpoint_manager.py:2013] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0425 17:06:43.669920 136762627626816 metric_logger.py:185] completed step: 9, seconds: 0.146, TFLOP/s/device: 92.974, Tokens/s/device: 14014.055, total_weights: 65536, loss: 8.175
Per train step:
 Total TFLOPs: 13.59 
 split as 93.93% learnable weight flops and 6.07% attention flops
XPK End: Sat Apr 25 17:06:56 UTC 2026
EXIT_CODE=0