MaxView

Timing Test Reference Updates
‹ 09_pdb_lt_1Case: 10_shardy_false10_shardy_true ›

Metrics: main (e27fc1e97) vs feat/nnx-post-train-fixes (e27fc1e97)

Metricmain  e27fc1e97feat/nnx-post-train-fixes  e27fc1e97Diff (feat/nnx-post-train-fixes − main)
Parameters1.104 billion1.104 billion—
Final loss8.17908.17900
TFLOP/s92.35292.258-0.094
Tok/s13920.313906.1-14.178
Avg s/step2.7162.711-0.005
Memory %1.381.380
JAX0.9.20.9.2—

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

main  ·  e27fc1e97  ·  main_20260421_061359  ·  full log 
XPK Start: Tue Apr 21 06:51:39 UTC 2026
PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used.
`rope_parameters`'s factor field must be a float >= 1, got 40
`rope_parameters`'s beta_fast field must be a float, got 32
`rope_parameters`'s beta_slow field must be a float, got 1
DeepseekV32Config got `key=rope_scaling` in kwargs but hasn't set it as attribute. For RoPE standardization you need to set `self.rope_parameters` in model's config. 
2026-04-21 06:52:03.926304: 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 06:52:04.140270 137237439330112 max_utils.py:273] Attempting to initialize the jax distributed system...
I0421 06:52:13.185099 137237439330112 distributed.py:149] Starting JAX distributed service on [::]:8482
I0421 06:52:13.187515 137237439330112 distributed.py:172] Connecting to JAX distributed service on mt-10-shardy-false-22umt-slice-job-0-0.mt-10-shardy-false-22umt:8482
I0421 06:52:14.429307 137237439330112 max_utils.py:284] Jax distributed system initialized!
I0421 06:52:20.752938 137237439330112 max_utils.py:800] System Information: Jax Version: 0.9.2
I0421 06:52:20.753043 137237439330112 max_utils.py:801] System Information: Jaxlib Version: 0.9.2
I0421 06:52:20.753084 137237439330112 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
I0421 06:52:20.753122 137237439330112 train_utils.py:361] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0421 06:52:21.456536 137237439330112 maxtext_utils.py:1565] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0421 06:52:21.456842 137237439330112 checkpointing.py:677] Setting up checkpoint logger...
I0421 06:52:21.456900 137237439330112 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True
I0421 06:52:21.456944 137237439330112 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None
I0421 06:52:21.457283 137237439330112 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 0x7cd07eb069c0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0421 06:52:24.671724 137237439330112 checkpointing.py:265] Enabling policy for fixed interval checkpointing.
I0421 06:52:24.672001 137237439330112 checkpoint_manager.py:708] [process=7][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7cbc0c3aa210>}, handler_registry=None
I0421 06:52:24.672241 137237439330112 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7cbc0c3aa210>` 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 06:52:24.672291 137237439330112 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7cbc0c3b01a0>` 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 06:52:24.672327 137237439330112 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 0x7cbc0c3aa210>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7cbc0c3aa210>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7cbc0c3b01a0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7cbc0c3b01a0>}).
I0421 06:52:24.672636 137237439330112 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34
I0421 06:52:24.672705 137237439330112 async_checkpointer.py:192] [process=7][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7cbc0c1f5800> timeout: 1200 secs and primary_host=0 for async checkpoint writes
I0421 06:52:25.467221 137237439330112 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_main_20260421_061359/linen_xpk_main_20260421_061359_10_shardy_false/checkpoints
I0421 06:52:25.886916 137237439330112 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_main_20260421_061359/linen_xpk_main_20260421_061359_10_shardy_false/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7cbc0c6d86e0>
I0421 06:52:25.887098 137237439330112 checkpointing.py:301] Checkpoint manager created!
I0421 06:52:26.811174 137237439330112 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0421 06:52:26.811292 137237439330112 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0421 06:52:27.194750 137237439330112 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0421 06:52:27.194842 137237439330112 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0421 06:52:27.211436 137237439330112 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0421 06:52:27.211499 137237439330112 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0421 06:52:27.235601 137237439330112 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0421 06:52:27.235671 137237439330112 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0421 06:52:27.252353 137237439330112 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0421 06:52:27.252419 137237439330112 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0421 06:52:27.268991 137237439330112 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0421 06:52:27.269054 137237439330112 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0421 06:52:27.293907 137237439330112 attentions.py:1198] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0421 06:52:27.293985 137237439330112 attentions.py:1198] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0421 06:52:27.315210 137237439330112 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0421 06:52:27.315273 137237439330112 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0421 06:52:27.527132 137237439330112 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint
I0421 06:52:27.527243 137237439330112 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0421 06:52:28.923673 137237439330112 maxtext_utils.py:1668]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   P('norm',)
    Physical:  (None,)
I0421 06:52:28.923819 137237439330112 maxtext_utils.py:1668]  params/params/decoder/layers/mlp/wi_0/kernel
    Shape:     float32[2048,16,7168]
    Logical:   P('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0421 06:52:28.923876 137237439330112 maxtext_utils.py:1668]  params/params/decoder/layers/mlp/wi_1/kernel
    Shape:     float32[2048,16,7168]
    Logical:   P('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0421 06:52:28.923936 137237439330112 maxtext_utils.py:1668]  params/params/decoder/layers/mlp/wo/kernel
    Shape:     float32[7168,16,2048]
    Logical:   P('mlp', 'layers', 'embed')
    Physical:  (None, None, 'fsdp')
I0421 06:52:28.923995 137237439330112 maxtext_utils.py:1668]  params/params/decoder/layers/post_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   P('norm', 'layers')
    Physical:  (None, None)
I0421 06:52:28.924035 137237439330112 maxtext_utils.py:1668]  params/params/decoder/layers/pre_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   P('norm', 'layers')
    Physical:  (None, None)
I0421 06:52:28.924090 137237439330112 maxtext_utils.py:1668]  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)
I0421 06:52:28.924145 137237439330112 maxtext_utils.py:1668]  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')
I0421 06:52:28.924186 137237439330112 maxtext_utils.py:1668]  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)
I0421 06:52:28.924223 137237439330112 maxtext_utils.py:1668]  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)
I0421 06:52:28.924271 137237439330112 maxtext_utils.py:1668]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   P('embed_vocab', 'vocab')
    Physical:  ('fsdp', None)
I0421 06:52:28.924321 137237439330112 maxtext_utils.py:1668]  params/params/token_embedder/embedding

    Shape:     float32[32000,2048]
    Logical:   P('vocab', 'embed_vocab')
    Physical:  (None, 'fsdp')
I0421 06:52:29.421369 137237439330112 train.py:155] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0421 06:52:29.421463 137237439330112 train.py:155] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0421 06:52:29.437494 137237439330112 train.py:162] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0421 06:52:29.437556 137237439330112 train.py:162] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0421 06:52:40.391041 137237439330112 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 06:52:40.391926 137237439330112 metric_logger.py:301] number parameters: 1.104 billion
I0421 06:52:52.017982 137237439330112 checkpointing.py:772] Waiting for step 0 to finish before checkpoint...
I0421 06:52:52.172132 137237439330112 checkpointing.py:776] Waited 0.154127836227417 seconds for step 0 to finish before starting checkpointing.
I0421 06:52:52.174551 137237439330112 checkpoint_manager.py:2009] [process=7][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0421 06:52:52.176127 137237439330112 checkpoint_manager.py:1512] [process=7] Saving checkpoint at step 0
I0421 06:52:52.177599 137237439330112 event_tracking.py:70] [process=7] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260421_061359/linen_xpk_main_20260421_061359_10_shardy_false/checkpoints/0.
I0421 06:52:52.509449 137237439330112 signaling_client.py:364] Using JaxDistributedSignalingClient
I0421 06:52:52.511810 137237439330112 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0421 06:52:52.511869 137237439330112 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 06:52:52.785777 137237439330112 base_pytree_checkpoint_handler.py:154] [process=7][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.276409s
I0421 06:52:52.785946 137237439330112 base_pytree_checkpoint_handler.py:130] [process=7] /jax/orbax/write/blocking_gbytes_per_sec: 5.467 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2821497917175293 s) (per-host)
I0421 06:52:52.785998 137237439330112 base_pytree_checkpoint_handler.py:768] [process=7][thread=MainThread] Initiated Pytree async_save. Time taken: 0.282211s (batch_requests_ready=0.002392s, total_serialization_initiated=0.279750s, others=0.000069s)
I0421 06:52:52.786098 137237439330112 composite_checkpoint_handler.py:715] [process=7][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.286557s (all_items=0.000018s, per_item={'items': '0.00001788'}, temp_paths=0.286539)
I0421 06:52:52.786867 137237439330112 event_tracking.py:125] [process=7] [async] Finished blocking save in 0.61 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260421_061359/linen_xpk_main_20260421_061359_10_shardy_false/checkpoints/0.
I0421 06:52:52.787198 137109258184448 async_checkpointer.py:76] [process=7][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-21 07:12:52.787159
I0421 06:52:52.791542 137237439330112 checkpoint_manager.py:1560] [process=7][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0421 06:52:52.791898 137106093504256 async_checkpointer.py:280] [process=7][thread=save_finalize] Waiting for background save thread=async_save.
I0421 06:52:52.792056 137237439330112 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260421_061359/linen_xpk_main_20260421_061359_10_shardy_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776754372.174531, 'wait_for_prev_duration_secs': 6.175041198730469e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776754372.1761658, 'checkpointer_blocking_duration_secs': 0.6111869812011719, 'get_old_steps_start_time': 1776754372.7873757, 'get_old_steps_duration_secs': 3.123283386230469e-05, 'checkpoint_manager_blocking_start_time': 1776754372.1727073, 'checkpoint_manager_blocking_duration_secs': 0.6193110942840576}
I0421 06:52:52.792160 137237439330112 checkpointing.py:408] Started an asynchronous checkpoint save for step 0
I0421 06:52:52.792210 137237439330112 max_utils.py:750] 
Memstats: After params initialized:
I0421 06:52:52.792256 137237439330112 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_26(process=7,(2,6,0,0))
I0421 06:52:52.792288 137237439330112 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_27(process=7,(3,6,0,0))
I0421 06:52:52.792315 137237439330112 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_30(process=7,(2,7,0,0))
I0421 06:52:52.792340 137237439330112 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_31(process=7,(3,7,0,0))
I0421 06:52:53.104245 137237439330112 metric_logger.py:196] completed step: 0, seconds: 11.626, TFLOP/s/device: 1.169, Tokens/s/device: 176.158, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0421 06:52:53.273622 137237439330112 metric_logger.py:196] completed step: 1, seconds: 1.085, TFLOP/s/device: 12.527, Tokens/s/device: 1888.177, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0421 06:52:53.694480 137237439330112 metric_logger.py:196] completed step: 2, seconds: 0.022, TFLOP/s/device: 615.666, Tokens/s/device: 92799.855, total_weights: 65536, loss: 10.262, lm_loss: 10.262, perplexity: 28637.129
I0421 06:52:53.841775 137237439330112 metric_logger.py:196] completed step: 3, seconds: 0.421, TFLOP/s/device: 32.257, Tokens/s/device: 4862.171, total_weights: 65536, loss: 9.734, lm_loss: 9.734, perplexity: 16889.203
I0421 06:52:54.137710 137237439330112 metric_logger.py:196] completed step: 4, seconds: 0.153, TFLOP/s/device: 88.736, Tokens/s/device: 13375.305, total_weights: 65536, loss: 9.277, lm_loss: 9.277, perplexity: 10694.614
I0421 06:52:54.143667 137237439330112 metric_logger.py:196] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.268, Tokens/s/device: 13907.564, total_weights: 65536, loss: 8.892, lm_loss: 8.892, perplexity: 7270.717
I0421 06:52:56.472034    2803 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0421 06:52:58.497781 137107655227136 array_metadata_store.py:203] [process=7][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260421_061359/linen_xpk_main_20260421_061359_10_shardy_false/checkpoints/0/items/array_metadatas/process_7
I0421 06:53:16.315333 137237439330112 metric_logger.py:196] completed step: 6, seconds: 0.296, TFLOP/s/device: 45.846, Tokens/s/device: 6910.468, total_weights: 65536, loss: 8.592, lm_loss: 8.592, perplexity: 5390.759
I0421 06:53:16.462571 137237439330112 metric_logger.py:196] completed step: 7, seconds: 22.025, TFLOP/s/device: 0.617, Tokens/s/device: 92.986, total_weights: 65536, loss: 8.384, lm_loss: 8.384, perplexity: 4376.905
I0421 06:53:16.609824 137237439330112 metric_logger.py:196] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.211, Tokens/s/device: 13446.879, total_weights: 65536, loss: 8.255, lm_loss: 8.255, perplexity: 3846.406
I0421 06:53:16.756456 137237439330112 checkpointing.py:772] Waiting for step 9 to finish before checkpoint...
I0421 06:53:16.757159 137237439330112 checkpointing.py:776] Waited 0.0007250308990478516 seconds for step 9 to finish before starting checkpointing.
I0421 06:53:16.759097 137237439330112 checkpoint_manager.py:2020] [process=7][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0421 06:53:29.507083 137109258184448 base_pytree_checkpoint_handler.py:130] [process=7] /jax/orbax/write/gbytes_per_sec: 42.688 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 37.00324487686157 s) (per-host)
I0421 06:53:29.507212 137109258184448 async_checkpointer.py:90] [process=7][thread=async_save] 3 Handler Commit operations completed. Time taken: 36.719903s.
I0421 06:53:38.485554 137109258184448 async_checkpointer.py:160] [process=7][thread=async_save] Background save thread done. Time taken: 45.698229s.
I0421 06:53:38.485866 137106093504256 async_checkpointer.py:288] [process=7][thread=save_finalize] Done with waiting for background save thread=async_save.
I0421 06:53:38.486009 137106093504256 async_checkpointer.py:298] [process=7][thread=save_finalize] No errors found in background save thread=async_save.
I0421 06:53:38.486078 137106093504256 checkpoint_manager.py:2137] [process=7][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0421 06:53:38.488555 137106093504256 checkpoint_manager.py:2146] [process=7][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0421 06:53:38.488780 137237439330112 checkpoint_manager.py:2032] [process=7][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0.
W0421 06:53:38.488933 137237439330112 checkpoint_manager.py:1452] Waiting for previous save to complete took 21.729834 seconds. If this number is high, consider checkpointing less frequently.
I0421 06:53:38.490671 137237439330112 checkpoint_manager.py:1512] [process=7] Saving checkpoint at step 9
I0421 06:53:38.492586 137237439330112 event_tracking.py:70] [process=7] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260421_061359/linen_xpk_main_20260421_061359_10_shardy_false/checkpoints/9.
I0421 06:53:39.231153 137237439330112 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0421 06:53:39.231248 137237439330112 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 06:53:39.279099 137237439330112 base_pytree_checkpoint_handler.py:154] [process=7][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.049130s
I0421 06:53:39.279250 137237439330112 base_pytree_checkpoint_handler.py:130] [process=7] /jax/orbax/write/blocking_gbytes_per_sec: 29.282 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.05267977714538574 s) (per-host)
I0421 06:53:39.279298 137237439330112 base_pytree_checkpoint_handler.py:768] [process=7][thread=MainThread] Initiated Pytree async_save. Time taken: 0.052736s (batch_requests_ready=0.001877s, total_serialization_initiated=0.050797s, others=0.000062s)
I0421 06:53:39.279381 137237439330112 composite_checkpoint_handler.py:715] [process=7][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.056810s (all_items=0.000015s, per_item={'items': '0.00001502'}, temp_paths=0.056795)
I0421 06:53:39.280068 137237439330112 event_tracking.py:125] [process=7] [async] Finished blocking save in 0.79 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260421_061359/linen_xpk_main_20260421_061359_10_shardy_false/checkpoints/9.
I0421 06:53:39.280437 137106093504256 async_checkpointer.py:76] [process=7][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-21 07:13:39.280398
I0421 06:53:39.282335 137237439330112 checkpoint_manager.py:1560] [process=7][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0421 06:53:39.282624 137087051339520 async_checkpointer.py:280] [process=7][thread=save_finalize] Waiting for background save thread=async_save.
I0421 06:53:39.282772 137237439330112 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260421_061359/linen_xpk_main_20260421_061359_10_shardy_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776754396.759067, 'wait_for_prev_duration_secs': 21.729833841323853, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776754418.4907103, 'checkpointer_blocking_duration_secs': 0.7898709774017334, 'get_old_steps_start_time': 1776754419.280603, 'get_old_steps_duration_secs': 3.2901763916015625e-05, 'checkpoint_manager_blocking_start_time': 1776754396.7573922, 'checkpoint_manager_blocking_duration_secs': 22.525335550308228}
I0421 06:53:39.282937 137237439330112 checkpointing.py:408] Started an asynchronous checkpoint save for step 9
I0421 06:53:39.282982 137237439330112 checkpoint_manager.py:2020] [process=7][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0421 06:53:44.277298 137107655227136 array_metadata_store.py:203] [process=7][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260421_061359/linen_xpk_main_20260421_061359_10_shardy_false/checkpoints/9/items/array_metadatas/process_7
I0421 06:54:20.928035 137106093504256 base_pytree_checkpoint_handler.py:130] [process=7] /jax/orbax/write/gbytes_per_sec: 37.879 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 41.701422929763794 s) (per-host)
I0421 06:54:20.928161 137106093504256 async_checkpointer.py:90] [process=7][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.647608s.
I0421 06:54:30.281713 137106093504256 async_checkpointer.py:160] [process=7][thread=async_save] Background save thread done. Time taken: 51.001146s.
I0421 06:54:30.282000 137087051339520 async_checkpointer.py:288] [process=7][thread=save_finalize] Done with waiting for background save thread=async_save.
I0421 06:54:30.282118 137087051339520 async_checkpointer.py:298] [process=7][thread=save_finalize] No errors found in background save thread=async_save.
I0421 06:54:30.282168 137087051339520 checkpoint_manager.py:2137] [process=7][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0421 06:54:30.283935 137087051339520 checkpoint_manager.py:2146] [process=7][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0421 06:54:30.284131 137237439330112 checkpoint_manager.py:2032] [process=7][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9.
I0421 06:54:30.284281 137237439330112 checkpoint_manager.py:2009] [process=7][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0421 06:54:30.285371 137237439330112 metric_logger.py:196] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.352, Tokens/s/device: 13920.325, 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: Tue Apr 21 06:54:39 UTC 2026
EXIT_CODE=0
feat/nnx-post-train-fixes  ·  e27fc1e97  ·  feat_nnx_post_train_fixes_20260421_114057  ·  full log 
XPK Start: Tue Apr 21 12:18:22 UTC 2026
PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used.
2026-04-21 12:18:47.003948: 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 12:18:47.543741 140534246274880 max_utils.py:273] Attempting to initialize the jax distributed system...
I0421 12:18:56.586148 140534246274880 distributed.py:149] Starting JAX distributed service on [::]:8482
I0421 12:18:56.588560 140534246274880 distributed.py:172] Connecting to JAX distributed service on mt-10-shardy-false-fql1z-slice-job-0-0.mt-10-shardy-false-fql1z:8482
I0421 12:18:57.787176 140534246274880 max_utils.py:284] Jax distributed system initialized!
I0421 12:19:04.080117 140534246274880 max_utils.py:800] System Information: Jax Version: 0.9.2
I0421 12:19:04.080216 140534246274880 max_utils.py:801] System Information: Jaxlib Version: 0.9.2
I0421 12:19:04.080256 140534246274880 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
I0421 12:19:04.080290 140534246274880 train_utils.py:378] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0421 12:19:04.783037 140534246274880 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0421 12:19:04.783613 140534246274880 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0421 12:19:04.783812 140534246274880 checkpointing.py:688] Setting up checkpoint logger...
I0421 12:19:04.783864 140534246274880 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True
I0421 12:19:04.783915 140534246274880 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None
I0421 12:19:04.784241 140534246274880 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 0x7fcff6150710>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0421 12:19:07.686841 140534246274880 checkpointing.py:266] Enabling policy for fixed interval checkpointing.
I0421 12:19:07.687083 140534246274880 checkpoint_manager.py:708] [process=7][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7fbbe00ff290>}, handler_registry=None
I0421 12:19:07.687318 140534246274880 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7fbbe00ff290>` 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 12:19:07.687368 140534246274880 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7fbbe0103e00>` 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 12:19:07.687402 140534246274880 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 0x7fbbe00ff290>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7fbbe00ff290>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7fbbe0103e00>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7fbbe0103e00>}).
I0421 12:19:07.687714 140534246274880 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34
I0421 12:19:07.687801 140534246274880 async_checkpointer.py:192] [process=7][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7fbbb8440180> timeout: 1200 secs and primary_host=0 for async checkpoint writes
I0421 12:19:08.807775 140534246274880 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_10_shardy_false/checkpoints
I0421 12:19:09.138938 140534246274880 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_feat_nnx_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_10_shardy_false/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7fbbe0101d00>
I0421 12:19:09.139117 140534246274880 checkpointing.py:302] Checkpoint manager created!
I0421 12:19:10.070107 140534246274880 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0421 12:19:10.070206 140534246274880 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0421 12:19:10.447862 140534246274880 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0421 12:19:10.447949 140534246274880 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0421 12:19:10.464130 140534246274880 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0421 12:19:10.464188 140534246274880 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0421 12:19:10.488004 140534246274880 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0421 12:19:10.488075 140534246274880 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0421 12:19:10.504371 140534246274880 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0421 12:19:10.504432 140534246274880 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0421 12:19:10.520813 140534246274880 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0421 12:19:10.520872 140534246274880 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0421 12:19:10.546322 140534246274880 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0421 12:19:10.546389 140534246274880 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0421 12:19:10.567267 140534246274880 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0421 12:19:10.567329 140534246274880 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0421 12:19:10.783296 140534246274880 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint
I0421 12:19:10.783403 140534246274880 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0421 12:19:12.185127 140534246274880 maxtext_utils.py:1827]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   P('norm',)
    Physical:  (None,)
I0421 12:19:12.185247 140534246274880 maxtext_utils.py:1827]  params/params/decoder/layers/mlp/wi_0/kernel
    Shape:     float32[2048,16,7168]
    Logical:   P('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0421 12:19:12.185298 140534246274880 maxtext_utils.py:1827]  params/params/decoder/layers/mlp/wi_1/kernel
    Shape:     float32[2048,16,7168]
    Logical:   P('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0421 12:19:12.185381 140534246274880 maxtext_utils.py:1827]  params/params/decoder/layers/mlp/wo/kernel
    Shape:     float32[7168,16,2048]
    Logical:   P('mlp', 'layers', 'embed')
    Physical:  (None, None, 'fsdp')
I0421 12:19:12.185437 140534246274880 maxtext_utils.py:1827]  params/params/decoder/layers/post_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   P('norm', 'layers')
    Physical:  (None, None)
I0421 12:19:12.185477 140534246274880 maxtext_utils.py:1827]  params/params/decoder/layers/pre_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   P('norm', 'layers')
    Physical:  (None, None)
I0421 12:19:12.185533 140534246274880 maxtext_utils.py:1827]  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)
I0421 12:19:12.185586 140534246274880 maxtext_utils.py:1827]  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')
I0421 12:19:12.185625 140534246274880 maxtext_utils.py:1827]  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)
I0421 12:19:12.185660 140534246274880 maxtext_utils.py:1827]  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)
I0421 12:19:12.185707 140534246274880 maxtext_utils.py:1827]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   P('embed_vocab', 'vocab')
    Physical:  ('fsdp', None)

I0421 12:19:12.185773 140534246274880 maxtext_utils.py:1827]  params/params/token_embedder/embedding
    Shape:     float32[32000,2048]
    Logical:   P('vocab', 'embed_vocab')
    Physical:  (None, 'fsdp')
I0421 12:19:12.680780 140534246274880 train.py:157] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0421 12:19:12.680878 140534246274880 train.py:157] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0421 12:19:12.696597 140534246274880 train.py:164] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0421 12:19:12.696658 140534246274880 train.py:164] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0421 12:19:23.589831 140534246274880 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 12:19:23.590666 140534246274880 metric_logger.py:301] number parameters: 1.104 billion
I0421 12:19:34.853937 140534246274880 checkpointing.py:794] Waiting for step 0 to finish before checkpoint...
I0421 12:19:35.007683 140534246274880 checkpointing.py:798] Waited 0.15372848510742188 seconds for step 0 to finish before starting checkpointing.
I0421 12:19:35.010153 140534246274880 checkpoint_manager.py:2009] [process=7][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0421 12:19:35.011792 140534246274880 checkpoint_manager.py:1512] [process=7] Saving checkpoint at step 0
I0421 12:19:35.013283 140534246274880 event_tracking.py:70] [process=7] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_10_shardy_false/checkpoints/0.
I0421 12:19:35.762583 140534246274880 signaling_client.py:364] Using JaxDistributedSignalingClient
I0421 12:19:35.763598 140534246274880 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0421 12:19:35.763657 140534246274880 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 12:19:36.037290 140534246274880 base_pytree_checkpoint_handler.py:154] [process=7][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.274779s
I0421 12:19:36.037466 140534246274880 base_pytree_checkpoint_handler.py:130] [process=7] /jax/orbax/write/blocking_gbytes_per_sec: 5.505 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2801980972290039 s) (per-host)
I0421 12:19:36.037522 140534246274880 base_pytree_checkpoint_handler.py:768] [process=7][thread=MainThread] Initiated Pytree async_save. Time taken: 0.280264s (batch_requests_ready=0.002208s, total_serialization_initiated=0.277983s, others=0.000073s)
I0421 12:19:36.037620 140534246274880 composite_checkpoint_handler.py:715] [process=7][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.284651s (all_items=0.000018s, per_item={'items': '0.00001788'}, temp_paths=0.284633)
I0421 12:19:36.038447 140534246274880 event_tracking.py:125] [process=7] [async] Finished blocking save in 1.03 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_10_shardy_false/checkpoints/0.
I0421 12:19:36.038779 140405551126272 async_checkpointer.py:76] [process=7][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-21 12:39:36.038729
I0421 12:19:36.051691 140534246274880 checkpoint_manager.py:1560] [process=7][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0421 12:19:36.051965 140403905537792 async_checkpointer.py:280] [process=7][thread=save_finalize] Waiting for background save thread=async_save.
I0421 12:19:36.052097 140534246274880 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_10_shardy_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776773975.0101364, 'wait_for_prev_duration_secs': 6.103515625e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776773975.011829, 'checkpointer_blocking_duration_secs': 1.0271003246307373, 'get_old_steps_start_time': 1776773976.0389547, 'get_old_steps_duration_secs': 2.956390380859375e-05, 'checkpoint_manager_blocking_start_time': 1776773975.0081735, 'checkpoint_manager_blocking_duration_secs': 1.0438852310180664}
I0421 12:19:36.052204 140534246274880 checkpointing.py:409] Started an asynchronous checkpoint save for step 0
I0421 12:19:36.052253 140534246274880 max_utils.py:750] 
Memstats: After params initialized:
I0421 12:19:36.052302 140534246274880 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_26(process=7,(2,6,0,0))
I0421 12:19:36.052334 140534246274880 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_27(process=7,(3,6,0,0))
I0421 12:19:36.052361 140534246274880 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_30(process=7,(2,7,0,0))
I0421 12:19:36.052385 140534246274880 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_31(process=7,(3,7,0,0))
I0421 12:19:36.365206 140534246274880 metric_logger.py:196] completed step: 0, seconds: 11.263, TFLOP/s/device: 1.206, Tokens/s/device: 181.832, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0421 12:19:36.543177 140534246274880 metric_logger.py:196] completed step: 1, seconds: 1.510, TFLOP/s/device: 8.999, Tokens/s/device: 1356.485, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0421 12:19:36.968159 140534246274880 metric_logger.py:196] completed step: 2, seconds: 0.031, TFLOP/s/device: 442.491, Tokens/s/device: 66697.062, total_weights: 65536, loss: 10.262, lm_loss: 10.262, perplexity: 28637.129
I0421 12:19:37.115581 140534246274880 metric_logger.py:196] completed step: 3, seconds: 0.425, TFLOP/s/device: 31.970, Tokens/s/device: 4818.858, total_weights: 65536, loss: 9.734, lm_loss: 9.734, perplexity: 16889.203
I0421 12:19:37.410802 140534246274880 metric_logger.py:196] completed step: 4, seconds: 0.153, TFLOP/s/device: 88.707, Tokens/s/device: 13370.939, total_weights: 65536, loss: 9.277, lm_loss: 9.277, perplexity: 10694.614
I0421 12:19:37.416415 140534246274880 metric_logger.py:196] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.271, Tokens/s/device: 13908.036, total_weights: 65536, loss: 8.892, lm_loss: 8.892, perplexity: 7270.717
I0421 12:19:39.000032    2793 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0421 12:19:41.011452 140403913930496 array_metadata_store.py:203] [process=7][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_10_shardy_false/checkpoints/0/items/array_metadatas/process_7
I0421 12:19:59.099241 140534246274880 metric_logger.py:196] completed step: 6, seconds: 0.296, TFLOP/s/device: 45.980, Tokens/s/device: 6930.603, total_weights: 65536, loss: 8.592, lm_loss: 8.592, perplexity: 5390.759
I0421 12:19:59.246693 140534246274880 metric_logger.py:196] completed step: 7, seconds: 21.536, TFLOP/s/device: 0.631, Tokens/s/device: 95.096, total_weights: 65536, loss: 8.384, lm_loss: 8.384, perplexity: 4376.905
I0421 12:19:59.393949 140534246274880 metric_logger.py:196] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.309, Tokens/s/device: 13461.640, total_weights: 65536, loss: 8.255, lm_loss: 8.255, perplexity: 3846.406
I0421 12:19:59.540758 140534246274880 checkpointing.py:794] Waiting for step 9 to finish before checkpoint...
I0421 12:19:59.541345 140534246274880 checkpointing.py:798] Waited 0.0006289482116699219 seconds for step 9 to finish before starting checkpointing.
I0421 12:19:59.543377 140534246274880 checkpoint_manager.py:2020] [process=7][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0421 12:20:12.534295 140405551126272 base_pytree_checkpoint_handler.py:130] [process=7] /jax/orbax/write/gbytes_per_sec: 42.951 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 36.776987075805664 s) (per-host)
I0421 12:20:12.534420 140405551126272 async_checkpointer.py:90] [process=7][thread=async_save] 3 Handler Commit operations completed. Time taken: 36.495531s.
I0421 12:20:21.456477 140405551126272 async_checkpointer.py:160] [process=7][thread=async_save] Background save thread done. Time taken: 45.417570s.
I0421 12:20:21.456806 140403905537792 async_checkpointer.py:288] [process=7][thread=save_finalize] Done with waiting for background save thread=async_save.
I0421 12:20:21.456936 140403905537792 async_checkpointer.py:298] [process=7][thread=save_finalize] No errors found in background save thread=async_save.
I0421 12:20:21.456987 140403905537792 checkpoint_manager.py:2137] [process=7][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0421 12:20:21.458645 140403905537792 checkpoint_manager.py:2146] [process=7][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0421 12:20:21.458816 140534246274880 checkpoint_manager.py:2032] [process=7][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0.
W0421 12:20:21.458945 140534246274880 checkpoint_manager.py:1452] Waiting for previous save to complete took 21.915569 seconds. If this number is high, consider checkpointing less frequently.
I0421 12:20:21.460863 140534246274880 checkpoint_manager.py:1512] [process=7] Saving checkpoint at step 9
I0421 12:20:21.462998 140534246274880 event_tracking.py:70] [process=7] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_10_shardy_false/checkpoints/9.
I0421 12:20:21.755145 140534246274880 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0421 12:20:21.755240 140534246274880 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 12:20:21.792806 140534246274880 base_pytree_checkpoint_handler.py:154] [process=7][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.038775s
I0421 12:20:21.792972 140534246274880 base_pytree_checkpoint_handler.py:130] [process=7] /jax/orbax/write/blocking_gbytes_per_sec: 36.576 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.04217410087585449 s) (per-host)
I0421 12:20:21.793022 140534246274880 base_pytree_checkpoint_handler.py:768] [process=7][thread=MainThread] Initiated Pytree async_save. Time taken: 0.042233s (batch_requests_ready=0.001756s, total_serialization_initiated=0.040411s, others=0.000066s)
I0421 12:20:21.793107 140534246274880 composite_checkpoint_handler.py:715] [process=7][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.046318s (all_items=0.000015s, per_item={'items': '0.00001526'}, temp_paths=0.046302)
I0421 12:20:21.793849 140534246274880 event_tracking.py:125] [process=7] [async] Finished blocking save in 0.33 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_10_shardy_false/checkpoints/9.
I0421 12:20:21.794188 140403905537792 async_checkpointer.py:76] [process=7][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-21 12:40:21.794150
I0421 12:20:21.796178 140534246274880 checkpoint_manager.py:1560] [process=7][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0421 12:20:21.796476 140405523703552 async_checkpointer.py:280] [process=7][thread=save_finalize] Waiting for background save thread=async_save.
I0421 12:20:21.796641 140534246274880 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_10_shardy_false/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776773999.5433476, 'wait_for_prev_duration_secs': 21.915568590164185, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776774021.4609025, 'checkpointer_blocking_duration_secs': 0.3334219455718994, 'get_old_steps_start_time': 1776774021.794348, 'get_old_steps_duration_secs': 3.0279159545898438e-05, 'checkpoint_manager_blocking_start_time': 1776773999.541565, 'checkpoint_manager_blocking_duration_secs': 22.25503921508789}
I0421 12:20:21.796771 140534246274880 checkpointing.py:409] Started an asynchronous checkpoint save for step 9
I0421 12:20:21.796819 140534246274880 checkpoint_manager.py:2020] [process=7][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0421 12:20:26.936894 140405532096256 array_metadata_store.py:203] [process=7][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_10_shardy_false/checkpoints/9/items/array_metadatas/process_7
I0421 12:21:02.969394 140403905537792 base_pytree_checkpoint_handler.py:130] [process=7] /jax/orbax/write/gbytes_per_sec: 38.322 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 41.218560457229614 s) (per-host)
I0421 12:21:02.969506 140403905537792 async_checkpointer.py:90] [process=7][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.175207s.
I0421 12:21:10.116896 140403905537792 async_checkpointer.py:160] [process=7][thread=async_save] Background save thread done. Time taken: 48.322582s.
I0421 12:21:10.117176 140405523703552 async_checkpointer.py:288] [process=7][thread=save_finalize] Done with waiting for background save thread=async_save.
I0421 12:21:10.117293 140405523703552 async_checkpointer.py:298] [process=7][thread=save_finalize] No errors found in background save thread=async_save.
I0421 12:21:10.117339 140405523703552 checkpoint_manager.py:2137] [process=7][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0421 12:21:10.118617 140405523703552 checkpoint_manager.py:2146] [process=7][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0421 12:21:10.118804 140534246274880 checkpoint_manager.py:2032] [process=7][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9.
I0421 12:21:10.118897 140534246274880 checkpoint_manager.py:2009] [process=7][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0421 12:21:10.119828 140534246274880 metric_logger.py:196] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.258, Tokens/s/device: 13906.147, 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: Tue Apr 21 12:21:19 UTC 2026
EXIT_CODE=0