MaxView

XPK Start: Tue Apr 21 11:46:04 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 11:46:29.146078: 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 11:46:29.686655 139494195316544 max_utils.py:273] Attempting to initialize the jax distributed system...
I0421 11:46:38.729350 139494195316544 distributed.py:149] Starting JAX distributed service on [::]:8482
I0421 11:46:38.731630 139494195316544 distributed.py:172] Connecting to JAX distributed service on mt-02-synthetic-sd2ef-slice-job-0-0.mt-02-synthetic-sd2ef:8482
I0421 11:46:40.331664 139494195316544 max_utils.py:284] Jax distributed system initialized!
I0421 11:46:45.560674 139494195316544 max_utils.py:800] System Information: Jax Version: 0.9.2
I0421 11:46:45.560798 139494195316544 max_utils.py:801] System Information: Jaxlib Version: 0.9.2
I0421 11:46:45.560840 139494195316544 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 11:46:45.560874 139494195316544 train_utils.py:378] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0421 11:46:46.265952 139494195316544 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0421 11:46:46.266525 139494195316544 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0421 11:46:46.266700 139494195316544 checkpointing.py:688] Setting up checkpoint logger...
I0421 11:46:46.266768 139494195316544 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True
I0421 11:46:46.266812 139494195316544 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None
I0421 11:46:46.267144 139494195316544 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 0x7eddce34d130>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0421 11:46:49.577763 139494195316544 checkpointing.py:266] Enabling policy for fixed interval checkpointing.
I0421 11:46:49.578000 139494195316544 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 0x7edcc057deb0>}, handler_registry=None
I0421 11:46:49.578239 139494195316544 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7edcc057deb0>` 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 11:46:49.578287 139494195316544 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7eca3c0e5220>` 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 11:46:49.578322 139494195316544 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 0x7edcc057deb0>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7edcc057deb0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7eca3c0e5220>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7eca3c0e5220>}).
I0421 11:46:49.578635 139494195316544 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34
I0421 11:46:49.578704 139494195316544 async_checkpointer.py:192] [process=7][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7ec9dc4e0180> timeout: 1200 secs and primary_host=0 for async checkpoint writes
I0421 11:46:50.246896 139494195316544 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_02_synthetic/checkpoints
I0421 11:46:50.535258 139494195316544 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_02_synthetic/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7eca3c0e5ca0>
I0421 11:46:50.535426 139494195316544 checkpointing.py:302] Checkpoint manager created!
I0421 11:46:51.472843 139494195316544 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0421 11:46:51.472948 139494195316544 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0421 11:46:51.855373 139494195316544 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0421 11:46:51.855461 139494195316544 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0421 11:46:51.871833 139494195316544 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0421 11:46:51.871890 139494195316544 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0421 11:46:51.895587 139494195316544 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 11:46:51.895655 139494195316544 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0421 11:46:51.912004 139494195316544 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 11:46:51.912067 139494195316544 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0421 11:46:51.928369 139494195316544 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 11:46:51.928426 139494195316544 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0421 11:46:51.953848 139494195316544 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0421 11:46:51.953915 139494195316544 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0421 11:46:51.974929 139494195316544 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0421 11:46:51.974997 139494195316544 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0421 11:46:52.191295 139494195316544 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint
I0421 11:46:52.191402 139494195316544 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0421 11:46:53.620628 139494195316544 maxtext_utils.py:1827]  params/params/decoder/decoder_norm/scale
    Shape:     float32[2048]
    Logical:   P('norm',)
    Physical:  (None,)
I0421 11:46:53.620793 139494195316544 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 11:46:53.621249 139494195316544 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 11:46:53.621384 139494195316544 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 11:46:53.621458 139494195316544 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 11:46:53.621506 139494195316544 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 11:46:53.621582 139494195316544 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 11:46:53.621646 139494195316544 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 11:46:53.621696 139494195316544 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 11:46:53.621756 139494195316544 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 11:46:53.621825 139494195316544 maxtext_utils.py:1827]  params/params/decoder/logits_dense/kernel
    Shape:     float32[2048,32000]
    Logical:   P('embed_vocab', 'vocab')
    Physical:  ('fsdp', None)
I0421 11:46:53.621889 139494195316544 maxtext_utils.py:1827]  params/params/token_embedder/embedding
    Shape:     float32[32000,2048]
    Logical:   P('vocab', 'embed_vocab')
    Physical:  (None, 'fsdp')

I0421 11:46:54.118881 139494195316544 train.py:157] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0421 11:46:54.118974 139494195316544 train.py:157] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0421 11:46:54.134518 139494195316544 train.py:164] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0421 11:46:54.134580 139494195316544 train.py:164] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0421 11:47:05.113133 139494195316544 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 11:47:05.114009 139494195316544 metric_logger.py:301] number parameters: 1.104 billion
I0421 11:47:16.730636 139494195316544 checkpointing.py:794] Waiting for step 0 to finish before checkpoint...
I0421 11:47:16.884751 139494195316544 checkpointing.py:798] Waited 0.15407919883728027 seconds for step 0 to finish before starting checkpointing.
I0421 11:47:16.888761 139494195316544 checkpoint_manager.py:2009] [process=7][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0421 11:47:16.890222 139494195316544 checkpoint_manager.py:1512] [process=7] Saving checkpoint at step 0
I0421 11:47:16.891654 139494195316544 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_02_synthetic/checkpoints/0.
I0421 11:47:17.206386 139494195316544 signaling_client.py:364] Using JaxDistributedSignalingClient
I0421 11:47:17.207250 139494195316544 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0421 11:47:17.207306 139494195316544 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 11:47:17.483639 139494195316544 base_pytree_checkpoint_handler.py:154] [process=7][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.277326s
I0421 11:47:17.483835 139494195316544 base_pytree_checkpoint_handler.py:130] [process=7] /jax/orbax/write/blocking_gbytes_per_sec: 5.455 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.28279638290405273 s) (per-host)
I0421 11:47:17.483891 139494195316544 base_pytree_checkpoint_handler.py:768] [process=7][thread=MainThread] Initiated Pytree async_save. Time taken: 0.282869s (batch_requests_ready=0.002226s, total_serialization_initiated=0.280563s, others=0.000081s)
I0421 11:47:17.483988 139494195316544 composite_checkpoint_handler.py:715] [process=7][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.287080s (all_items=0.000017s, per_item={'items': '0.00001717'}, temp_paths=0.287063)
I0421 11:47:17.484769 139494195316544 event_tracking.py:125] [process=7] [async] Finished blocking save in 0.59 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_02_synthetic/checkpoints/0.
I0421 11:47:17.485131 139367921489664 async_checkpointer.py:76] [process=7][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-21 12:07:17.485093
I0421 11:47:17.488432 139494195316544 checkpoint_manager.py:1560] [process=7][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0421 11:47:17.488686 139362561947392 async_checkpointer.py:280] [process=7][thread=save_finalize] Waiting for background save thread=async_save.
I0421 11:47:17.488813 139494195316544 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_02_synthetic/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776772036.8887253, 'wait_for_prev_duration_secs': 8.225440979003906e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776772036.8902605, 'checkpointer_blocking_duration_secs': 0.5950276851654053, 'get_old_steps_start_time': 1776772037.485311, 'get_old_steps_duration_secs': 3.0040740966796875e-05, 'checkpoint_manager_blocking_start_time': 1776772036.8851478, 'checkpoint_manager_blocking_duration_secs': 0.6036262512207031}
I0421 11:47:17.488922 139494195316544 checkpointing.py:409] Started an asynchronous checkpoint save for step 0
I0421 11:47:17.488971 139494195316544 max_utils.py:750] 
Memstats: After params initialized:
I0421 11:47:17.489020 139494195316544 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_26(process=7,(2,6,0,0))
I0421 11:47:17.489059 139494195316544 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_27(process=7,(3,6,0,0))
I0421 11:47:17.489085 139494195316544 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_30(process=7,(2,7,0,0))
I0421 11:47:17.489109 139494195316544 max_utils.py:756] 	Using (GB) 0.43 / 31.25 (1.376000%) on TPU_31(process=7,(3,7,0,0))
I0421 11:47:17.805367 139494195316544 metric_logger.py:196] completed step: 0, seconds: 11.617, TFLOP/s/device: 1.170, Tokens/s/device: 176.301, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0421 11:47:17.983404 139494195316544 metric_logger.py:196] completed step: 1, seconds: 1.073, TFLOP/s/device: 12.661, Tokens/s/device: 1908.331, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875
I0421 11:47:18.383726 139494195316544 metric_logger.py:196] completed step: 2, seconds: 0.031, TFLOP/s/device: 443.647, Tokens/s/device: 66871.286, total_weights: 65536, loss: 10.262, lm_loss: 10.262, perplexity: 28637.129
I0421 11:47:18.530931 139494195316544 metric_logger.py:196] completed step: 3, seconds: 0.401, TFLOP/s/device: 33.917, Tokens/s/device: 5112.408, total_weights: 65536, loss: 9.734, lm_loss: 9.734, perplexity: 16889.203
I0421 11:47:18.826101 139494195316544 metric_logger.py:196] completed step: 4, seconds: 0.153, TFLOP/s/device: 88.644, Tokens/s/device: 13361.343, total_weights: 65536, loss: 9.277, lm_loss: 9.277, perplexity: 10694.614
I0421 11:47:18.832160 139494195316544 metric_logger.py:196] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.366, Tokens/s/device: 13922.407, total_weights: 65536, loss: 8.892, lm_loss: 8.892, perplexity: 7270.717
I0421 11:47:21.083806    2764 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0421 11:47:23.634583 139363578824448 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_02_synthetic/checkpoints/0/items/array_metadatas/process_7
I0421 11:47:40.837453 139494195316544 metric_logger.py:196] completed step: 6, seconds: 0.296, TFLOP/s/device: 45.948, Tokens/s/device: 6925.798, total_weights: 65536, loss: 8.592, lm_loss: 8.592, perplexity: 5390.759
I0421 11:47:40.984865 139494195316544 metric_logger.py:196] completed step: 7, seconds: 21.858, TFLOP/s/device: 0.622, Tokens/s/device: 93.694, total_weights: 65536, loss: 8.384, lm_loss: 8.384, perplexity: 4376.905
I0421 11:47:41.132064 139494195316544 metric_logger.py:196] completed step: 8, seconds: 0.153, TFLOP/s/device: 88.977, Tokens/s/device: 13411.655, total_weights: 65536, loss: 8.255, lm_loss: 8.255, perplexity: 3846.406
I0421 11:47:41.278796 139494195316544 checkpointing.py:794] Waiting for step 9 to finish before checkpoint...
I0421 11:47:41.279437 139494195316544 checkpointing.py:798] Waited 0.0006608963012695312 seconds for step 9 to finish before starting checkpointing.
I0421 11:47:41.281492 139494195316544 checkpoint_manager.py:2020] [process=7][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0421 11:47:55.147235 139367921489664 base_pytree_checkpoint_handler.py:130] [process=7] /jax/orbax/write/gbytes_per_sec: 41.627 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 37.94616365432739 s) (per-host)
I0421 11:47:55.147364 139367921489664 async_checkpointer.py:90] [process=7][thread=async_save] 3 Handler Commit operations completed. Time taken: 37.662121s.
I0421 11:48:03.143228 139367921489664 async_checkpointer.py:160] [process=7][thread=async_save] Background save thread done. Time taken: 45.657968s.
I0421 11:48:03.143459 139362561947392 async_checkpointer.py:288] [process=7][thread=save_finalize] Done with waiting for background save thread=async_save.
I0421 11:48:03.143530 139362561947392 async_checkpointer.py:298] [process=7][thread=save_finalize] No errors found in background save thread=async_save.
I0421 11:48:03.143582 139362561947392 checkpoint_manager.py:2137] [process=7][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0421 11:48:03.145912 139362561947392 checkpoint_manager.py:2146] [process=7][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0421 11:48:03.146100 139494195316544 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 11:48:03.146245 139494195316544 checkpoint_manager.py:1452] Waiting for previous save to complete took 21.864753 seconds. If this number is high, consider checkpointing less frequently.
I0421 11:48:03.147937 139494195316544 checkpoint_manager.py:1512] [process=7] Saving checkpoint at step 9
I0421 11:48:03.149916 139494195316544 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_02_synthetic/checkpoints/9.
I0421 11:48:03.449974 139494195316544 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array.
I0421 11:48:03.450072 139494195316544 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 11:48:03.485295 139494195316544 base_pytree_checkpoint_handler.py:154] [process=7][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.036407s
I0421 11:48:03.485461 139494195316544 base_pytree_checkpoint_handler.py:130] [process=7] /jax/orbax/write/blocking_gbytes_per_sec: 38.744 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.03981447219848633 s) (per-host)
I0421 11:48:03.485512 139494195316544 base_pytree_checkpoint_handler.py:768] [process=7][thread=MainThread] Initiated Pytree async_save. Time taken: 0.039875s (batch_requests_ready=0.001761s, total_serialization_initiated=0.038046s, others=0.000068s)
I0421 11:48:03.485602 139494195316544 composite_checkpoint_handler.py:715] [process=7][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.044200s (all_items=0.000015s, per_item={'items': '0.00001502'}, temp_paths=0.044185)
I0421 11:48:03.487678 139494195316544 event_tracking.py:125] [process=7] [async] Finished blocking save in 0.34 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_02_synthetic/checkpoints/9.
I0421 11:48:03.487987 139362561947392 async_checkpointer.py:76] [process=7][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-21 12:08:03.487954
I0421 11:48:03.489962 139494195316544 checkpoint_manager.py:1560] [process=7][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0421 11:48:03.490264 139346279573248 async_checkpointer.py:280] [process=7][thread=save_finalize] Waiting for background save thread=async_save.
I0421 11:48:03.490396 139494195316544 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_02_synthetic/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776772061.2814627, 'wait_for_prev_duration_secs': 21.864752531051636, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776772083.1479747, 'checkpointer_blocking_duration_secs': 0.3401632308959961, 'get_old_steps_start_time': 1776772083.4881618, 'get_old_steps_duration_secs': 3.147125244140625e-05, 'checkpoint_manager_blocking_start_time': 1776772061.2796614, 'checkpoint_manager_blocking_duration_secs': 22.21070146560669}
I0421 11:48:03.490549 139494195316544 checkpointing.py:409] Started an asynchronous checkpoint save for step 9
I0421 11:48:03.490598 139494195316544 checkpoint_manager.py:2020] [process=7][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0421 11:48:09.009814 139363578824448 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_02_synthetic/checkpoints/9/items/array_metadatas/process_7
I0421 11:48:45.061472 139362561947392 base_pytree_checkpoint_handler.py:130] [process=7] /jax/orbax/write/gbytes_per_sec: 37.957 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 41.61578941345215 s) (per-host)
I0421 11:48:45.061582 139362561947392 async_checkpointer.py:90] [process=7][thread=async_save] 3 Handler Commit operations completed. Time taken: 41.573477s.
I0421 11:48:53.682714 139362561947392 async_checkpointer.py:160] [process=7][thread=async_save] Background save thread done. Time taken: 50.194593s.
I0421 11:48:53.683017 139346279573248 async_checkpointer.py:288] [process=7][thread=save_finalize] Done with waiting for background save thread=async_save.
I0421 11:48:53.683148 139346279573248 async_checkpointer.py:298] [process=7][thread=save_finalize] No errors found in background save thread=async_save.
I0421 11:48:53.683194 139346279573248 checkpoint_manager.py:2137] [process=7][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0421 11:48:53.684659 139346279573248 checkpoint_manager.py:2146] [process=7][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0421 11:48:53.684848 139494195316544 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 11:48:53.684996 139494195316544 checkpoint_manager.py:2009] [process=7][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0421 11:48:53.685896 139494195316544 metric_logger.py:196] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.446, Tokens/s/device: 13934.532, 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 11:49:05 UTC 2026
EXIT_CODE=0