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Timing Test Reference Updates
‹ 03_dropoutCase: 04_int805_fp8 ›

Metrics: main (59e0f1759) vs feat/nnx-post-train-fixes (28b1e4a16)

Metricmain  59e0f1759feat/nnx-post-train-fixes  28b1e4a16Diff (feat/nnx-post-train-fixes − main)
Parameters1.104 billion1.104 billion—
Final loss8.17508.17500
TFLOP/s59.24959.172-0.077
Tok/s8930.78919.1-11.551
Avg s/step3.6133.612-0.001
Memory %1.381.380
JAX0.9.20.9.2—

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

main  ·  59e0f1759  ·  main_20260425_071456  ·  full log 
XPK Start: Sat Apr 25 07:21:16 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. 
2026-04-25 07:21:41.869574: 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 07:21:42.079255 135965884618560 max_utils.py:273] Attempting to initialize the jax distributed system...
I0425 07:21:51.119862 135965884618560 distributed.py:149] Starting JAX distributed service on [::]:8482
I0425 07:21:51.122118 135965884618560 distributed.py:172] Connecting to JAX distributed service on mt-04-int8-tfv0h-slice-job-0-0.mt-04-int8-tfv0h:8482
I0425 07:21:51.944138 135965884618560 max_utils.py:284] Jax distributed system initialized!
I0425 07:21:57.985152 135965884618560 max_utils.py:800] System Information: Jax Version: 0.9.2
I0425 07:21:57.985256 135965884618560 max_utils.py:801] System Information: Jaxlib Version: 0.9.2
I0425 07:21:57.985296 135965884618560 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
I0425 07:21:57.985332 135965884618560 train_utils.py:361] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0425 07:21:58.676079 135965884618560 maxtext_utils.py:1604] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0425 07:21:58.676470 135965884618560 checkpointing.py:677] Setting up checkpoint logger...
I0425 07:21:58.676526 135965884618560 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True
I0425 07:21:58.676569 135965884618560 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None
I0425 07:21:58.676913 135965884618560 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 0x7ba871f1ede0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0425 07:22:01.486215 135965884618560 checkpointing.py:265] Enabling policy for fixed interval checkpointing.
I0425 07:22:01.486443 135965884618560 checkpoint_manager.py:708] [process=5][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7ba74308a300>}, handler_registry=None
I0425 07:22:01.486701 135965884618560 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7ba74308a300>` 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 07:22:01.486752 135965884618560 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7b946413c560>` 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 07:22:01.486789 135965884618560 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 0x7ba74308a300>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7ba74308a300>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7b946413c560>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7b946413c560>}).
I0425 07:22:01.487118 135965884618560 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34
I0425 07:22:01.487190 135965884618560 async_checkpointer.py:192] [process=5][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7b94445d1760> timeout: 1200 secs and primary_host=0 for async checkpoint writes
I0425 07:22:02.648800 135965884618560 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_main_20260425_071456/linen_xpk_main_20260425_071456_04_int8/checkpoints
I0425 07:22:02.688567 135965884618560 checkpoint_manager.py:929] [process=5][thread=MainThread] CheckpointManager created,  primary_host=0, CheckpointManagerOptions=CheckpointManagerOptions(save_interval_steps=1, max_to_keep=None, keep_time_interval=None, keep_period=None, should_keep_fn=None, best_fn=None, best_mode='max', keep_checkpoints_without_metrics=True, step_prefix=None, step_format_fixed_length=None, step_name_format=None, create=True, cleanup_tmp_directories=False, save_on_steps=frozenset(), single_host_load_and_broadcast=False, todelete_subdir=None, todelete_full_path=None, enable_background_delete=False, read_only=False, enable_async_checkpointing=True, async_options=None, multiprocessing_options=MultiprocessingOptions(primary_host=0, active_processes=None, barrier_sync_key_prefix=None), should_save_fn=None, file_options=FileOptions(path_permission_mode=None), save_root_metadata=True, temporary_path_class=None, save_decision_policy=FixedIntervalPolicy(interval=10), preservation_policy=LatestN(n=None), prevent_write_metrics=False, enable_should_save_is_saving_in_progress_check=True, enable_per_process_directory_creation=False, lightweight_initialize=False), root_directory=gs://lance-maxtext/linen_ckpt_xpk_main_20260425_071456/linen_xpk_main_20260425_071456_04_int8/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7b9464135a60>
I0425 07:22:02.688736 135965884618560 checkpointing.py:301] Checkpoint manager created!
I0425 07:22:03.830742 135965884618560 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0425 07:22:03.830857 135965884618560 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0425 07:22:04.218037 135965884618560 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0425 07:22:04.218132 135965884618560 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0425 07:22:04.234637 135965884618560 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0425 07:22:04.234702 135965884618560 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0425 07:22:04.300613 135965884618560 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0425 07:22:04.300716 135965884618560 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0425 07:22:04.317263 135965884618560 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0425 07:22:04.317322 135965884618560 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0425 07:22:04.333912 135965884618560 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0425 07:22:04.333976 135965884618560 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0425 07:22:04.358685 135965884618560 attentions.py:1198] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0425 07:22:04.358756 135965884618560 attentions.py:1198] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0425 07:22:04.424959 135965884618560 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0425 07:22:04.425045 135965884618560 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0425 07:22:04.932487 135965884618560 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint
I0425 07:22:04.932595 135965884618560 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0425 07:22:07.426491 135965884618560 maxtext_utils.py:1707]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   P('norm',)
    Physical:  (None,)
I0425 07:22:07.426615 135965884618560 maxtext_utils.py:1707]  params/params/decoder/layers/mlp/wi_0/kernel
    Shape:     float32[2048,16,7168]
    Logical:   P('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0425 07:22:07.426681 135965884618560 maxtext_utils.py:1707]  params/params/decoder/layers/mlp/wi_1/kernel
    Shape:     float32[2048,16,7168]
    Logical:   P('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0425 07:22:07.426740 135965884618560 maxtext_utils.py:1707]  params/params/decoder/layers/mlp/wo/kernel
    Shape:     float32[7168,16,2048]
    Logical:   P('mlp', 'layers', 'embed')
    Physical:  (None, None, 'fsdp')
I0425 07:22:07.426794 135965884618560 maxtext_utils.py:1707]  params/params/decoder/layers/post_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   P('norm', 'layers')
    Physical:  (None, None)
I0425 07:22:07.426833 135965884618560 maxtext_utils.py:1707]  params/params/decoder/layers/pre_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   P('norm', 'layers')
    Physical:  (None, None)
I0425 07:22:07.426887 135965884618560 maxtext_utils.py:1707]  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)
I0425 07:22:07.426943 135965884618560 maxtext_utils.py:1707]  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')
I0425 07:22:07.426985 135965884618560 maxtext_utils.py:1707]  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)
I0425 07:22:07.427020 135965884618560 maxtext_utils.py:1707]  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)
I0425 07:22:07.427066 135965884618560 maxtext_utils.py:1707]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   P('embed_vocab', 'vocab')
    Physical:  ('fsdp', None)
I0425 07:22:07.427113 135965884618560 maxtext_utils.py:1707]  params/params/token_embedder/embedding
    Shape:     float32[32000,2048]
    Logical:   P('vocab', 'embed_vocab')
    Physical:  (None, 'fsdp')

I0425 07:22:08.817587 135965884618560 train.py:155] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0425 07:22:08.817697 135965884618560 train.py:155] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0425 07:22:08.834160 135965884618560 train.py:162] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0425 07:22:08.834223 135965884618560 train.py:162] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0425 07:22:22.341513 135965884618560 max_utils.py:791] Total memory size: 1.8 GB, Output size: 0.4 GB, Temp size: 1.4 GB, Argument size: 0.4 GB, Host temp size: 0.0 GB.
I0425 07:22:22.342331 135965884618560 metric_logger.py:301] number parameters: 1.104 billion
I0425 07:22:37.212856 135965884618560 checkpointing.py:772] Waiting for step 0 to finish before checkpoint...
I0425 07:22:37.453130 135965884618560 checkpointing.py:776] Waited 0.2402477264404297 seconds for step 0 to finish before starting checkpointing.
I0425 07:22:37.455894 135965884618560 checkpoint_manager.py:2009] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0425 07:22:37.459030 135965884618560 checkpoint_manager.py:1512] [process=5] Saving checkpoint at step 0
I0425 07:22:37.460455 135965884618560 event_tracking.py:70] [process=5] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260425_071456/linen_xpk_main_20260425_071456_04_int8/checkpoints/0.
I0425 07:22:37.786480 135965884618560 signaling_client.py:364] Using JaxDistributedSignalingClient
I0425 07:22:37.787490 135965884618560 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0425 07:22:37.787547 135965884618560 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 07:22:38.066318 135965884618560 base_pytree_checkpoint_handler.py:154] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.279913s
I0425 07:22:38.066492 135965884618560 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/blocking_gbytes_per_sec: 5.406 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.28536128997802734 s) (per-host)
I0425 07:22:38.066548 135965884618560 base_pytree_checkpoint_handler.py:768] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.285427s (batch_requests_ready=0.002229s, total_serialization_initiated=0.283124s, others=0.000073s)
I0425 07:22:38.066646 135965884618560 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.289515s (all_items=0.000019s, per_item={'items': '0.00001860'}, temp_paths=0.289496)
I0425 07:22:38.067538 135965884618560 event_tracking.py:125] [process=5] [async] Finished blocking save in 0.61 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260425_071456/linen_xpk_main_20260425_071456_04_int8/checkpoints/0.
I0425 07:22:38.067868 135833875052288 async_checkpointer.py:76] [process=5][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-25 07:42:38.067830
I0425 07:22:38.078439 135965884618560 checkpoint_manager.py:1560] [process=5][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0425 07:22:38.078732 135831321896704 async_checkpointer.py:280] [process=5][thread=save_finalize] Waiting for background save thread=async_save.
I0425 07:22:38.078892 135965884618560 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260425_071456/linen_xpk_main_20260425_071456_04_int8/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1777101757.455877, 'wait_for_prev_duration_secs': 6.031990051269531e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1777101757.4590714, 'checkpointer_blocking_duration_secs': 0.6089563369750977, 'get_old_steps_start_time': 1777101758.0680528, 'get_old_steps_duration_secs': 3.2901763916015625e-05, 'checkpoint_manager_blocking_start_time': 1777101757.453697, 'checkpoint_manager_blocking_duration_secs': 0.6251547336578369}
I0425 07:22:38.079006 135965884618560 checkpointing.py:408] Started an asynchronous checkpoint save for step 0
I0425 07:22:38.079055 135965884618560 max_utils.py:750] 
Memstats: After params initialized:
I0425 07:22:38.079104 135965884618560 max_utils.py:756] 	Using (GB) 0.44 / 31.25 (1.408000%) on TPU_18(process=5,(2,4,0,0))
I0425 07:22:38.079138 135965884618560 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_19(process=5,(3,4,0,0))
I0425 07:22:38.079165 135965884618560 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_22(process=5,(2,5,0,0))
I0425 07:22:38.079191 135965884618560 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_23(process=5,(3,5,0,0))
I0425 07:22:38.393681 135965884618560 metric_logger.py:196] completed step: 0, seconds: 14.870, TFLOP/s/device: 0.914, Tokens/s/device: 137.723, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52796.277
I0425 07:22:38.664057 135965884618560 metric_logger.py:196] completed step: 1, seconds: 1.179, TFLOP/s/device: 11.522, Tokens/s/device: 1736.650, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52796.277
I0425 07:22:39.081716 135965884618560 metric_logger.py:196] completed step: 2, seconds: 0.042, TFLOP/s/device: 326.786, Tokens/s/device: 49256.819, total_weights: 65536, loss: 10.262, lm_loss: 10.262, perplexity: 28634.820
I0425 07:22:39.311253 135965884618560 metric_logger.py:196] completed step: 3, seconds: 0.418, TFLOP/s/device: 32.511, Tokens/s/device: 4900.459, total_weights: 65536, loss: 9.731, lm_loss: 9.731, perplexity: 16827.199
I0425 07:22:39.775644 135965884618560 metric_logger.py:196] completed step: 4, seconds: 0.235, TFLOP/s/device: 57.867, Tokens/s/device: 8722.317, total_weights: 65536, loss: 9.272, lm_loss: 9.272, perplexity: 10638.531
I0425 07:22:39.781880 135965884618560 metric_logger.py:196] completed step: 5, seconds: 0.230, TFLOP/s/device: 59.183, Tokens/s/device: 8920.677, total_weights: 65536, loss: 8.887, lm_loss: 8.887, perplexity: 7233.941
I0425 07:22:41.303051    2925 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0425 07:22:43.365815 135832799807232 array_metadata_store.py:203] [process=5][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260425_071456/linen_xpk_main_20260425_071456_04_int8/checkpoints/0/items/array_metadatas/process_5
I0425 07:23:09.498006 135965884618560 metric_logger.py:196] completed step: 6, seconds: 0.465, TFLOP/s/device: 29.228, Tokens/s/device: 4405.628, total_weights: 65536, loss: 8.588, lm_loss: 8.588, perplexity: 5365.468
I0425 07:23:09.727385 135965884618560 metric_logger.py:196] completed step: 7, seconds: 29.488, TFLOP/s/device: 0.461, Tokens/s/device: 69.452, total_weights: 65536, loss: 8.380, lm_loss: 8.380, perplexity: 4358.779
I0425 07:23:09.956782 135965884618560 metric_logger.py:196] completed step: 8, seconds: 0.234, TFLOP/s/device: 58.054, Tokens/s/device: 8750.566, total_weights: 65536, loss: 8.251, lm_loss: 8.251, perplexity: 3831.453
I0425 07:23:10.185567 135965884618560 checkpointing.py:772] Waiting for step 9 to finish before checkpoint...
I0425 07:23:10.186244 135965884618560 checkpointing.py:776] Waited 0.0006976127624511719 seconds for step 9 to finish before starting checkpointing.
I0425 07:23:10.188390 135965884618560 checkpoint_manager.py:2020] [process=5][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0425 07:23:11.670372 135833875052288 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/gbytes_per_sec: 46.611 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 33.88920211791992 s) (per-host)
I0425 07:23:11.670495 135833875052288 async_checkpointer.py:90] [process=5][thread=async_save] 3 Handler Commit operations completed. Time taken: 33.602513s.
I0425 07:23:19.863918 135833875052288 async_checkpointer.py:160] [process=5][thread=async_save] Background save thread done. Time taken: 41.795918s.
I0425 07:23:19.864192 135831321896704 async_checkpointer.py:288] [process=5][thread=save_finalize] Done with waiting for background save thread=async_save.
I0425 07:23:19.864320 135831321896704 async_checkpointer.py:298] [process=5][thread=save_finalize] No errors found in background save thread=async_save.
I0425 07:23:19.864371 135831321896704 checkpoint_manager.py:2137] [process=5][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0425 07:23:19.866041 135831321896704 checkpoint_manager.py:2146] [process=5][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0425 07:23:19.866220 135965884618560 checkpoint_manager.py:2032] [process=5][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0.
W0425 07:23:19.866360 135965884618560 checkpoint_manager.py:1452] Waiting for previous save to complete took 9.677972 seconds. If this number is high, consider checkpointing less frequently.
I0425 07:23:19.868197 135965884618560 checkpoint_manager.py:1512] [process=5] Saving checkpoint at step 9
I0425 07:23:19.870316 135965884618560 event_tracking.py:70] [process=5] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260425_071456/linen_xpk_main_20260425_071456_04_int8/checkpoints/9.
I0425 07:23:20.180980 135965884618560 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0425 07:23:20.181073 135965884618560 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 07:23:20.224014 135965884618560 base_pytree_checkpoint_handler.py:154] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.044906s
I0425 07:23:20.224178 135965884618560 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/blocking_gbytes_per_sec: 31.903 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.048351287841796875 s) (per-host)
I0425 07:23:20.224235 135965884618560 base_pytree_checkpoint_handler.py:768] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.048417s (batch_requests_ready=0.001795s, total_serialization_initiated=0.046549s, others=0.000073s)
I0425 07:23:20.224331 135965884618560 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.053346s (all_items=0.000016s, per_item={'items': '0.00001597'}, temp_paths=0.053330)
I0425 07:23:20.225048 135965884618560 event_tracking.py:125] [process=5] [async] Finished blocking save in 0.36 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260425_071456/linen_xpk_main_20260425_071456_04_int8/checkpoints/9.
I0425 07:23:20.225403 135831321896704 async_checkpointer.py:76] [process=5][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-25 07:43:20.225366
I0425 07:23:20.227372 135965884618560 checkpoint_manager.py:1560] [process=5][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0425 07:23:20.227627 135833340327680 async_checkpointer.py:280] [process=5][thread=save_finalize] Waiting for background save thread=async_save.
I0425 07:23:20.227800 135965884618560 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260425_071456/linen_xpk_main_20260425_071456_04_int8/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1777101790.188358, 'wait_for_prev_duration_secs': 9.677971601486206, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1777101799.8682365, 'checkpointer_blocking_duration_secs': 0.35731029510498047, 'get_old_steps_start_time': 1777101800.2255714, 'get_old_steps_duration_secs': 2.9802322387695312e-05, 'checkpoint_manager_blocking_start_time': 1777101790.186482, 'checkpoint_manager_blocking_duration_secs': 10.041281700134277}
I0425 07:23:20.227904 135965884618560 checkpointing.py:408] Started an asynchronous checkpoint save for step 9
I0425 07:23:20.227949 135965884618560 checkpoint_manager.py:2020] [process=5][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0425 07:23:25.333943 135833859925760 array_metadata_store.py:203] [process=5][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260425_071456/linen_xpk_main_20260425_071456_04_int8/checkpoints/9/items/array_metadatas/process_5
I0425 07:24:02.656580 135831321896704 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/gbytes_per_sec: 37.184 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.48072957992554 s) (per-host)
I0425 07:24:02.656706 135831321896704 async_checkpointer.py:90] [process=5][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.431186s.
I0425 07:24:10.118889 135831321896704 async_checkpointer.py:160] [process=5][thread=async_save] Background save thread done. Time taken: 49.893354s.
I0425 07:24:10.119287 135833340327680 async_checkpointer.py:288] [process=5][thread=save_finalize] Done with waiting for background save thread=async_save.
I0425 07:24:10.119402 135833340327680 async_checkpointer.py:298] [process=5][thread=save_finalize] No errors found in background save thread=async_save.
I0425 07:24:10.119449 135833340327680 checkpoint_manager.py:2137] [process=5][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0425 07:24:10.120985 135833340327680 checkpoint_manager.py:2146] [process=5][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0425 07:24:10.121161 135965884618560 checkpoint_manager.py:2032] [process=5][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9.
I0425 07:24:10.121315 135965884618560 checkpoint_manager.py:2009] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0425 07:24:10.122251 135965884618560 metric_logger.py:196] completed step: 9, seconds: 0.229, TFLOP/s/device: 59.249, Tokens/s/device: 8930.674, total_weights: 65536, loss: 8.175, lm_loss: 8.175, perplexity: 3552.333
Per train step:
 Total TFLOPs: 13.59 
 split as 93.93% learnable weight flops and 6.07% attention flops
XPK End: Sat Apr 25 07:24:26 UTC 2026
EXIT_CODE=0
feat/nnx-post-train-fixes  ·  28b1e4a16  ·  feat_nnx_post_train_fixes_20260425_121355  ·  full log 
XPK Start: Sat Apr 25 12:20:08 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. 
2026-04-25 12:20:33.441782: 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 12:20:33.655097 137777247573824 max_utils.py:273] Attempting to initialize the jax distributed system...
I0425 12:20:42.695390 137777247573824 distributed.py:149] Starting JAX distributed service on [::]:8482
I0425 12:20:42.697675 137777247573824 distributed.py:172] Connecting to JAX distributed service on mt-04-int8-y1p5z-slice-job-0-0.mt-04-int8-y1p5z:8482
I0425 12:20:43.783497 137777247573824 max_utils.py:284] Jax distributed system initialized!
I0425 12:20:48.744628 137777247573824 max_utils.py:800] System Information: Jax Version: 0.9.2
I0425 12:20:48.744753 137777247573824 max_utils.py:801] System Information: Jaxlib Version: 0.9.2
I0425 12:20:48.744794 137777247573824 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
I0425 12:20:48.744829 137777247573824 train_utils.py:391] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0425 12:20:49.435761 137777247573824 maxtext_utils.py:1771] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0425 12:20:49.436346 137777247573824 maxtext_utils.py:1771] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0425 12:20:49.436639 137777247573824 checkpointing.py:688] Setting up checkpoint logger...
I0425 12:20:49.436705 137777247573824 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True
I0425 12:20:49.436748 137777247573824 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None
I0425 12:20:49.437080 137777247573824 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 0x7d4e0c450c50>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0425 12:20:52.266637 137777247573824 checkpointing.py:266] Enabling policy for fixed interval checkpointing.
I0425 12:20:52.266896 137777247573824 checkpoint_manager.py:708] [process=5][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7d3a8438dfa0>}, handler_registry=None
I0425 12:20:52.267138 137777247573824 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7d3a8438dfa0>` 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 12:20:52.267186 137777247573824 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d3a84236660>` 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 12:20:52.267222 137777247573824 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 0x7d3a8438dfa0>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7d3a8438dfa0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d3a84236660>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d3a84236660>}).
I0425 12:20:52.267544 137777247573824 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34
I0425 12:20:52.267613 137777247573824 async_checkpointer.py:192] [process=5][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7d3964575d00> timeout: 1200 secs and primary_host=0 for async checkpoint writes
I0425 12:20:53.008536 137777247573824 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260425_121355/linen_xpk_feat_nnx_post_train_fixes_20260425_121355_04_int8/checkpoints
I0425 12:20:53.384433 137777247573824 checkpoint_manager.py:929] [process=5][thread=MainThread] CheckpointManager created,  primary_host=0, CheckpointManagerOptions=CheckpointManagerOptions(save_interval_steps=1, max_to_keep=None, keep_time_interval=None, keep_period=None, should_keep_fn=None, best_fn=None, best_mode='max', keep_checkpoints_without_metrics=True, step_prefix=None, step_format_fixed_length=None, step_name_format=None, create=True, cleanup_tmp_directories=False, save_on_steps=frozenset(), single_host_load_and_broadcast=False, todelete_subdir=None, todelete_full_path=None, enable_background_delete=False, read_only=False, enable_async_checkpointing=True, async_options=None, multiprocessing_options=MultiprocessingOptions(primary_host=0, active_processes=None, barrier_sync_key_prefix=None), should_save_fn=None, file_options=FileOptions(path_permission_mode=None), save_root_metadata=True, temporary_path_class=None, save_decision_policy=FixedIntervalPolicy(interval=10), preservation_policy=LatestN(n=None), prevent_write_metrics=False, enable_should_save_is_saving_in_progress_check=True, enable_per_process_directory_creation=False, lightweight_initialize=False), root_directory=gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260425_121355/linen_xpk_feat_nnx_post_train_fixes_20260425_121355_04_int8/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7d4cf6781430>
I0425 12:20:53.384607 137777247573824 checkpointing.py:302] Checkpoint manager created!
I0425 12:20:54.529728 137777247573824 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0425 12:20:54.529843 137777247573824 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0425 12:20:54.918904 137777247573824 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0425 12:20:54.919002 137777247573824 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0425 12:20:54.935515 137777247573824 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0425 12:20:54.935577 137777247573824 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0425 12:20:55.001323 137777247573824 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0425 12:20:55.001408 137777247573824 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0425 12:20:55.018013 137777247573824 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0425 12:20:55.018074 137777247573824 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0425 12:20:55.034483 137777247573824 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0425 12:20:55.034545 137777247573824 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0425 12:20:55.059557 137777247573824 attentions.py:1198] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0425 12:20:55.059624 137777247573824 attentions.py:1198] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0425 12:20:55.132397 137777247573824 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0425 12:20:55.132502 137777247573824 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0425 12:20:55.653777 137777247573824 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint
I0425 12:20:55.653888 137777247573824 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0425 12:20:58.123244 137777247573824 maxtext_utils.py:1880]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   P('norm',)
    Physical:  (None,)
I0425 12:20:58.123373 137777247573824 maxtext_utils.py:1880]  params/params/decoder/layers/mlp/wi_0/kernel
    Shape:     float32[2048,16,7168]
    Logical:   P('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0425 12:20:58.123426 137777247573824 maxtext_utils.py:1880]  params/params/decoder/layers/mlp/wi_1/kernel
    Shape:     float32[2048,16,7168]
    Logical:   P('embed', 'layers', 'mlp')
    Physical:  ('fsdp', None, None)
I0425 12:20:58.123483 137777247573824 maxtext_utils.py:1880]  params/params/decoder/layers/mlp/wo/kernel
    Shape:     float32[7168,16,2048]
    Logical:   P('mlp', 'layers', 'embed')
    Physical:  (None, None, 'fsdp')
I0425 12:20:58.123536 137777247573824 maxtext_utils.py:1880]  params/params/decoder/layers/post_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   P('norm', 'layers')
    Physical:  (None, None)
I0425 12:20:58.123574 137777247573824 maxtext_utils.py:1880]  params/params/decoder/layers/pre_self_attention_layer_norm/scale
    Shape:     float32[2048,16]
    Logical:   P('norm', 'layers')
    Physical:  (None, None)
I0425 12:20:58.123626 137777247573824 maxtext_utils.py:1880]  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)
I0425 12:20:58.123702 137777247573824 maxtext_utils.py:1880]  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')
I0425 12:20:58.123747 137777247573824 maxtext_utils.py:1880]  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)
I0425 12:20:58.123784 137777247573824 maxtext_utils.py:1880]  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)
I0425 12:20:58.123833 137777247573824 maxtext_utils.py:1880]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   P('embed_vocab', 'vocab')
    Physical:  ('fsdp', None)

I0425 12:20:58.123882 137777247573824 maxtext_utils.py:1880]  params/params/token_embedder/embedding
    Shape:     float32[32000,2048]
    Logical:   P('vocab', 'embed_vocab')
    Physical:  (None, 'fsdp')
I0425 12:20:59.524884 137777247573824 train.py:157] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0425 12:20:59.524977 137777247573824 train.py:157] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0425 12:20:59.541383 137777247573824 train.py:164] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0425 12:20:59.541446 137777247573824 train.py:164] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0425 12:21:13.007593 137777247573824 max_utils.py:791] Total memory size: 1.8 GB, Output size: 0.4 GB, Temp size: 1.4 GB, Argument size: 0.4 GB, Host temp size: 0.0 GB.
I0425 12:21:13.008463 137777247573824 metric_logger.py:301] number parameters: 1.104 billion
I0425 12:21:28.318017 137777247573824 checkpointing.py:794] Waiting for step 0 to finish before checkpoint...
I0425 12:21:28.558539 137777247573824 checkpointing.py:798] Waited 0.2405099868774414 seconds for step 0 to finish before starting checkpointing.
I0425 12:21:28.561202 137777247573824 checkpoint_manager.py:2009] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0425 12:21:28.563209 137777247573824 checkpoint_manager.py:1512] [process=5] Saving checkpoint at step 0
I0425 12:21:28.564891 137777247573824 event_tracking.py:70] [process=5] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260425_121355/linen_xpk_feat_nnx_post_train_fixes_20260425_121355_04_int8/checkpoints/0.
I0425 12:21:29.299915 137777247573824 signaling_client.py:364] Using JaxDistributedSignalingClient
I0425 12:21:29.300781 137777247573824 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0425 12:21:29.300841 137777247573824 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 12:21:29.573395 137777247573824 base_pytree_checkpoint_handler.py:154] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.273553s
I0425 12:21:29.573566 137777247573824 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/blocking_gbytes_per_sec: 5.527 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2790830135345459 s) (per-host)
I0425 12:21:29.573619 137777247573824 base_pytree_checkpoint_handler.py:768] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.279145s (batch_requests_ready=0.002250s, total_serialization_initiated=0.276825s, others=0.000070s)
I0425 12:21:29.573772 137777247573824 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.283695s (all_items=0.000019s, per_item={'items': '0.00001860'}, temp_paths=0.283676)
I0425 12:21:29.574621 137777247573824 event_tracking.py:125] [process=5] [async] Finished blocking save in 1.01 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260425_121355/linen_xpk_feat_nnx_post_train_fixes_20260425_121355_04_int8/checkpoints/0.
I0425 12:21:29.574986 137648058578688 async_checkpointer.py:76] [process=5][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-25 12:41:29.574948
I0425 12:21:29.589398 137777247573824 checkpoint_manager.py:1560] [process=5][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0425 12:21:29.589683 137647490062080 async_checkpointer.py:280] [process=5][thread=save_finalize] Waiting for background save thread=async_save.
I0425 12:21:29.589820 137777247573824 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260425_121355/linen_xpk_feat_nnx_post_train_fixes_20260425_121355_04_int8/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1777119688.5611825, 'wait_for_prev_duration_secs': 6.437301635742188e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1777119688.563298, 'checkpointer_blocking_duration_secs': 1.0118508338928223, 'get_old_steps_start_time': 1777119689.5751753, 'get_old_steps_duration_secs': 3.147125244140625e-05, 'checkpoint_manager_blocking_start_time': 1777119688.5591083, 'checkpoint_manager_blocking_duration_secs': 1.030668020248413}
I0425 12:21:29.589943 137777247573824 checkpointing.py:409] Started an asynchronous checkpoint save for step 0
I0425 12:21:29.590006 137777247573824 max_utils.py:750] 
Memstats: After params initialized:
I0425 12:21:29.590072 137777247573824 max_utils.py:756] 	Using (GB) 0.44 / 31.25 (1.408000%) on TPU_18(process=5,(2,4,0,0))
I0425 12:21:29.590113 137777247573824 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_19(process=5,(3,4,0,0))
I0425 12:21:29.590153 137777247573824 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_22(process=5,(2,5,0,0))
I0425 12:21:29.590187 137777247573824 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_23(process=5,(3,5,0,0))
I0425 12:21:29.910668 137777247573824 metric_logger.py:196] completed step: 0, seconds: 15.309, TFLOP/s/device: 0.888, Tokens/s/device: 133.774, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52796.277
I0425 12:21:30.163183 137777247573824 metric_logger.py:196] completed step: 1, seconds: 1.591, TFLOP/s/device: 8.540, Tokens/s/device: 1287.198, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52796.277
I0425 12:21:30.615152 137777247573824 metric_logger.py:196] completed step: 2, seconds: 0.024, TFLOP/s/device: 569.906, Tokens/s/device: 85902.437, total_weights: 65536, loss: 10.262, lm_loss: 10.262, perplexity: 28634.820
I0425 12:21:30.844887 137777247573824 metric_logger.py:196] completed step: 3, seconds: 0.452, TFLOP/s/device: 30.032, Tokens/s/device: 4526.717, total_weights: 65536, loss: 9.731, lm_loss: 9.731, perplexity: 16827.199
I0425 12:21:31.303977 137777247573824 metric_logger.py:196] completed step: 4, seconds: 0.235, TFLOP/s/device: 57.868, Tokens/s/device: 8722.465, total_weights: 65536, loss: 9.272, lm_loss: 9.272, perplexity: 10638.531
I0425 12:21:31.310387 137777247573824 metric_logger.py:196] completed step: 5, seconds: 0.229, TFLOP/s/device: 59.245, Tokens/s/device: 8930.012, total_weights: 65536, loss: 8.887, lm_loss: 8.887, perplexity: 7233.941
I0425 12:21:32.511434    2899 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0425 12:21:34.537028 137647498454784 array_metadata_store.py:203] [process=5][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260425_121355/linen_xpk_feat_nnx_post_train_fixes_20260425_121355_04_int8/checkpoints/0/items/array_metadatas/process_5
I0425 12:22:00.595968 137777247573824 metric_logger.py:196] completed step: 6, seconds: 0.460, TFLOP/s/device: 29.545, Tokens/s/device: 4453.374, total_weights: 65536, loss: 8.588, lm_loss: 8.588, perplexity: 5365.468
I0425 12:22:00.825478 137777247573824 metric_logger.py:196] completed step: 7, seconds: 29.058, TFLOP/s/device: 0.468, Tokens/s/device: 70.480, total_weights: 65536, loss: 8.380, lm_loss: 8.380, perplexity: 4358.779
I0425 12:22:01.055386 137777247573824 metric_logger.py:196] completed step: 8, seconds: 0.233, TFLOP/s/device: 58.208, Tokens/s/device: 8773.696, total_weights: 65536, loss: 8.251, lm_loss: 8.251, perplexity: 3831.453
I0425 12:22:01.284076 137777247573824 checkpointing.py:794] Waiting for step 9 to finish before checkpoint...
I0425 12:22:01.284777 137777247573824 checkpointing.py:798] Waited 0.0007228851318359375 seconds for step 9 to finish before starting checkpointing.
I0425 12:22:01.286815 137777247573824 checkpoint_manager.py:2020] [process=5][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0425 12:22:02.150600 137648058578688 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/gbytes_per_sec: 48.076 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 32.85609292984009 s) (per-host)
I0425 12:22:02.150720 137648058578688 async_checkpointer.py:90] [process=5][thread=async_save] 3 Handler Commit operations completed. Time taken: 32.575620s.
I0425 12:22:11.114735 137648058578688 async_checkpointer.py:160] [process=5][thread=async_save] Background save thread done. Time taken: 41.539618s.
I0425 12:22:11.115045 137647490062080 async_checkpointer.py:288] [process=5][thread=save_finalize] Done with waiting for background save thread=async_save.
I0425 12:22:11.115171 137647490062080 async_checkpointer.py:298] [process=5][thread=save_finalize] No errors found in background save thread=async_save.
I0425 12:22:11.115222 137647490062080 checkpoint_manager.py:2137] [process=5][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0425 12:22:11.117765 137647490062080 checkpoint_manager.py:2146] [process=5][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0425 12:22:11.117980 137777247573824 checkpoint_manager.py:2032] [process=5][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0.
W0425 12:22:11.118119 137777247573824 checkpoint_manager.py:1452] Waiting for previous save to complete took 9.831303 seconds. If this number is high, consider checkpointing less frequently.
I0425 12:22:11.119911 137777247573824 checkpoint_manager.py:1512] [process=5] Saving checkpoint at step 9
I0425 12:22:11.121834 137777247573824 event_tracking.py:70] [process=5] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260425_121355/linen_xpk_feat_nnx_post_train_fixes_20260425_121355_04_int8/checkpoints/9.
I0425 12:22:11.699374 137777247573824 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0425 12:22:11.699471 137777247573824 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 12:22:11.730275 137777247573824 base_pytree_checkpoint_handler.py:154] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.032914s
I0425 12:22:11.730414 137777247573824 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/blocking_gbytes_per_sec: 42.417 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.03636670112609863 s) (per-host)
I0425 12:22:11.730460 137777247573824 base_pytree_checkpoint_handler.py:768] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.036422s (batch_requests_ready=0.001813s, total_serialization_initiated=0.034547s, others=0.000062s)
I0425 12:22:11.730549 137777247573824 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.040485s (all_items=0.000015s, per_item={'items': '0.00001502'}, temp_paths=0.040470)
I0425 12:22:11.731177 137777247573824 event_tracking.py:125] [process=5] [async] Finished blocking save in 0.61 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260425_121355/linen_xpk_feat_nnx_post_train_fixes_20260425_121355_04_int8/checkpoints/9.
I0425 12:22:11.731435 137647498454784 async_checkpointer.py:76] [process=5][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-25 12:42:11.731399
I0425 12:22:11.735441 137777247573824 checkpoint_manager.py:1560] [process=5][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0425 12:22:11.735705 137647490062080 async_checkpointer.py:280] [process=5][thread=save_finalize] Waiting for background save thread=async_save.
I0425 12:22:11.735858 137777247573824 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260425_121355/linen_xpk_feat_nnx_post_train_fixes_20260425_121355_04_int8/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1777119721.2867854, 'wait_for_prev_duration_secs': 9.831303119659424, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1777119731.119949, 'checkpointer_blocking_duration_secs': 0.6115846633911133, 'get_old_steps_start_time': 1777119731.731554, 'get_old_steps_duration_secs': 2.5987625122070312e-05, 'checkpoint_manager_blocking_start_time': 1777119721.2850115, 'checkpoint_manager_blocking_duration_secs': 10.450812816619873}
I0425 12:22:11.736018 137777247573824 checkpointing.py:409] Started an asynchronous checkpoint save for step 9
I0425 12:22:11.736064 137777247573824 checkpoint_manager.py:2020] [process=5][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0425 12:22:17.744078 137629131597568 array_metadata_store.py:203] [process=5][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260425_121355/linen_xpk_feat_nnx_post_train_fixes_20260425_121355_04_int8/checkpoints/9/items/array_metadatas/process_5
I0425 12:22:53.483470 137647498454784 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/gbytes_per_sec: 37.799 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 41.78938674926758 s) (per-host)
I0425 12:22:53.483577 137647498454784 async_checkpointer.py:90] [process=5][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.751651s.
I0425 12:23:01.629307 137647498454784 async_checkpointer.py:160] [process=5][thread=async_save] Background save thread done. Time taken: 49.897365s.
I0425 12:23:01.629601 137647490062080 async_checkpointer.py:288] [process=5][thread=save_finalize] Done with waiting for background save thread=async_save.
I0425 12:23:01.629757 137647490062080 async_checkpointer.py:298] [process=5][thread=save_finalize] No errors found in background save thread=async_save.
I0425 12:23:01.629808 137647490062080 checkpoint_manager.py:2137] [process=5][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0425 12:23:01.631858 137647490062080 checkpoint_manager.py:2146] [process=5][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0425 12:23:01.632045 137777247573824 checkpoint_manager.py:2032] [process=5][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9.
I0425 12:23:01.632201 137777247573824 checkpoint_manager.py:2009] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0425 12:23:01.633127 137777247573824 metric_logger.py:196] completed step: 9, seconds: 0.230, TFLOP/s/device: 59.172, Tokens/s/device: 8919.123, total_weights: 65536, loss: 8.175, lm_loss: 8.175, perplexity: 3552.333
Per train step:
 Total TFLOPs: 13.59 
 split as 93.93% learnable weight flops and 6.07% attention flops
XPK End: Sat Apr 25 12:23:13 UTC 2026
EXIT_CODE=0