XPK Start: Wed Apr 22 15:52:10 UTC 2026
2026-04-22 15:52:14.568853: E external/local_xla/xla/stream_executor/cuda/cuda_fft.cc:467] Unable to register cuFFT factory: Attempting to register factory for plugin cuFFT when one has already been registered
WARNING: All log messages before absl::InitializeLog() is called are written to STDERR
E0000 00:00:1776873134.582602 10 cuda_dnn.cc:8579] Unable to register cuDNN factory: Attempting to register factory for plugin cuDNN when one has already been registered
E0000 00:00:1776873134.586497 10 cuda_blas.cc:1407] Unable to register cuBLAS factory: Attempting to register factory for plugin cuBLAS when one has already been registered
W0000 00:00:1776873134.598127 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776873134.598152 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776873134.598155 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
W0000 00:00:1776873134.598157 10 computation_placer.cc:177] computation placer already registered. Please check linkage and avoid linking the same target more than once.
2026-04-22 15:52:34.261553: 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)
I0422 15:52:34.789295 140014694840128 max_utils.py:273] Attempting to initialize the jax distributed system...
INFO:2026-04-22 15:52:43,830:jax._src.distributed:140: Starting JAX distributed service on [::]:8482
I0422 15:52:43.830500 140014694840128 distributed.py:140] Starting JAX distributed service on [::]:8482
INFO:2026-04-22 15:52:43,832:jax._src.distributed:157: Connecting to JAX distributed service on mt-02-synthetic-c7568-slice-job-0-0.mt-02-synthetic-c7568:8482
I0422 15:52:43.832853 140014694840128 distributed.py:157] Connecting to JAX distributed service on mt-02-synthetic-c7568-slice-job-0-0.mt-02-synthetic-c7568:8482
I0422 15:52:45.273488 140014694840128 max_utils.py:284] Jax distributed system initialized!
I0422 15:52:52.611402 140014694840128 max_utils.py:800] System Information: Jax Version: 0.8.1
I0422 15:52:52.611509 140014694840128 max_utils.py:801] System Information: Jaxlib Version: 0.8.1
I0422 15:52:52.611550 140014694840128 max_utils.py:802] System Information: Jax Backend: PJRT C API
TFRT TPU v6 lite
Built on Nov 12 2025 14:16:36 (1762985796) cl/831091709
I0422 15:52:52.611583 140014694840128 train_utils.py:377] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing.
I0422 15:52:53.234894 140014694840128 maxtext_utils.py:1631] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0422 15:52:53.235494 140014694840128 maxtext_utils.py:1631] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1)
I0422 15:52:53.235681 140014694840128 checkpointing.py:688] Setting up checkpoint logger...
I0422 15:52:53.235732 140014694840128 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True
I0422 15:52:53.235777 140014694840128 pytree_checkpoint_handler.py:589] save_device_host_concurrent_bytes=None
I0422 15:52:53.236201 140014694840128 base_pytree_checkpoint_handler.py:415] Created BasePyTreeCheckpointHandler: use_ocdbt=True, use_zarr3=True, pytree_metadata_options=PyTreeMetadataOptions(support_rich_types=False), array_metadata_store=<orbax.checkpoint._src.metadata.array_metadata_store.Store object at 0x7f573e5790a0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB)
I0422 15:52:56.346147 140014694840128 checkpointing.py:266] Enabling policy for fixed interval checkpointing.
I0422 15:52:56.346391 140014694840128 checkpoint_manager.py:709] [process=6][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7f42a83b1a00>}, handler_registry=None
I0422 15:52:56.346633 140014694840128 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7f42a83b1a00>` 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`.
I0422 15:52:56.346683 140014694840128 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7f42a83b61e0>` 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`.
I0422 15:52:56.346719 140014694840128 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 0x7f42a83b1a00>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7f42a83b1a00>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7f42a83b61e0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7f42a83b61e0>}).
I0422 15:52:56.347239 140014694840128 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.33
I0422 15:52:56.347317 140014694840128 async_checkpointer.py:177] [process=6][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7f42a81a8180> timeout: 600 secs and primary_host=0 for async checkpoint writes
I0422 15:52:57.428112 140014694840128 checkpoint_manager.py:1818] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260422_154647/linen_xpk_feat_nnx_set_defaults_true_20260422_154647_02_synthetic/checkpoints
I0422 15:52:57.992918 140014694840128 checkpoint_manager.py:929] [process=6][thread=MainThread] CheckpointManager created, primary_host=0, CheckpointManagerOptions=CheckpointManagerOptions(save_interval_steps=1, max_to_keep=None, keep_time_interval=None, keep_period=None, should_keep_fn=None, best_fn=None, best_mode='max', keep_checkpoints_without_metrics=True, step_prefix=None, step_format_fixed_length=None, step_name_format=None, create=True, cleanup_tmp_directories=False, save_on_steps=frozenset(), single_host_load_and_broadcast=False, todelete_subdir=None, todelete_full_path=None, enable_background_delete=False, read_only=False, enable_async_checkpointing=True, async_options=None, multiprocessing_options=MultiprocessingOptions(primary_host=0, active_processes=None, barrier_sync_key_prefix=None), should_save_fn=None, file_options=FileOptions(path_permission_mode=None), save_root_metadata=True, temporary_path_class=None, save_decision_policy=FixedIntervalPolicy(interval=10), preservation_policy=LatestN(n=None), prevent_write_metrics=False, enable_should_save_is_saving_in_progress_check=True, enable_per_process_directory_creation=False, lightweight_initialize=False), root_directory=gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260422_154647/linen_xpk_feat_nnx_set_defaults_true_20260422_154647_02_synthetic/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7f42a831f4a0>
I0422 15:52:57.993118 140014694840128 checkpointing.py:302] Checkpoint manager created!
I0422 15:52:58.894496 140014694840128 nnx_wrappers.py:455] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed').
I0422 15:52:58.894605 140014694840128 nnx_wrappers.py:455] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0422 15:52:59.263952 140014694840128 attentions.py:1084] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0422 15:52:59.264047 140014694840128 attentions.py:1084] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0422 15:52:59.279889 140014694840128 attentions.py:1085] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed').
I0422 15:52:59.279950 140014694840128 attentions.py:1085] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None).
I0422 15:52:59.302585 140014694840128 attentions.py:1150] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0422 15:52:59.302651 140014694840128 attentions.py:1150] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0422 15:52:59.318537 140014694840128 attentions.py:1151] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0422 15:52:59.318598 140014694840128 attentions.py:1151] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0422 15:52:59.334475 140014694840128 attentions.py:1152] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim').
I0422 15:52:59.334542 140014694840128 attentions.py:1152] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0422 15:52:59.359564 140014694840128 attentions.py:1193] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv').
I0422 15:52:59.359634 140014694840128 attentions.py:1193] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None).
I0422 15:52:59.379170 140014694840128 linears.py:541] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp').
I0422 15:52:59.379235 140014694840128 linears.py:541] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None).
I0422 15:52:59.568077 140014694840128 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint
I0422 15:52:59.568222 140014694840128 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint.
fsdp: 32
I0422 15:53:01.008252 140014694840128 maxtext_utils.py:1740] params/params/decoder/decoder_norm/scale
Shape: float32[2048]
Logical: PartitionSpec('norm',)
Physical: (None,)
I0422 15:53:01.008414 140014694840128 maxtext_utils.py:1740] params/params/decoder/layers/mlp/wi_0/kernel
Shape: float32[2048,16,7168]
Logical: PartitionSpec('embed', 'layers', 'mlp')
Physical: ('fsdp', None, None)
I0422 15:53:01.008496 140014694840128 maxtext_utils.py:1740] params/params/decoder/layers/mlp/wi_1/kernel
Shape: float32[2048,16,7168]
Logical: PartitionSpec('embed', 'layers', 'mlp')
Physical: ('fsdp', None, None)
I0422 15:53:01.008581 140014694840128 maxtext_utils.py:1740] params/params/decoder/layers/mlp/wo/kernel
Shape: float32[7168,16,2048]
Logical: PartitionSpec('mlp', 'layers', 'embed')
Physical: (None, None, 'fsdp')
I0422 15:53:01.008660 140014694840128 maxtext_utils.py:1740] params/params/decoder/layers/post_self_attention_layer_norm/scale
Shape: float32[2048,16]
Logical: PartitionSpec('norm', 'layers')
Physical: (None, None)
I0422 15:53:01.008720 140014694840128 maxtext_utils.py:1740] params/params/decoder/layers/pre_self_attention_layer_norm/scale
Shape: float32[2048,16]
Logical: PartitionSpec('norm', 'layers')
Physical: (None, None)
I0422 15:53:01.008795 140014694840128 maxtext_utils.py:1740] params/params/decoder/layers/self_attention/key/kernel
Shape: float32[2048,16,16,128]
Logical: PartitionSpec('embed', 'layers', 'kv_heads', 'kv_head_dim')
Physical: ('fsdp', None, None, None)
I0422 15:53:01.008877 140014694840128 maxtext_utils.py:1740] params/params/decoder/layers/self_attention/out/kernel
Shape: float32[16,16,128,2048]
Logical: PartitionSpec('heads', 'layers', 'kv', 'embed')
Physical: (None, None, None, 'fsdp')
I0422 15:53:01.008935 140014694840128 maxtext_utils.py:1740] params/params/decoder/layers/self_attention/query/kernel
Shape: float32[2048,16,16,128]
Logical: PartitionSpec('embed', 'layers', 'q_heads', 'kv')
Physical: ('fsdp', None, None, None)
I0422 15:53:01.009004 140014694840128 maxtext_utils.py:1740] params/params/decoder/layers/self_attention/value/kernel
Shape: float32[2048,16,16,128]
Logical: PartitionSpec('embed', 'layers', 'kv_heads', 'kv_head_dim')
Physical: ('fsdp', None, None, None)
I0422 15:53:01.009079 140014694840128 maxtext_utils.py:1740] params/params/decoder/logits_dense/kernel
Shape: float32[2048,32000]
Logical: PartitionSpec('embed', 'vocab')
Physical: ('fsdp', None)
I0422 15:53:01.009193 140014694840128 maxtext_utils.py:1740] params/params/token_embedder/embedding
Shape: float32[32000,2048]
Logical: PartitionSpec('vocab', 'embed')
Physical: (None, 'fsdp')
I0422 15:53:01.507035 140014694840128 train.py:158] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0422 15:53:01.507167 140014694840128 train.py:158] train/xent Physical: float32[32,2048]............................................ ('fsdp', None).
I0422 15:53:01.522040 140014694840128 train.py:165] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length').
I0422 15:53:01.522116 140014694840128 train.py:165] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None).
I0422 15:53:12.248585 140014694840128 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.
I0422 15:53:12.249542 140014694840128 metric_logger.py:289] number parameters: 1.104 billion
I0422 15:53:23.305069 140014694840128 checkpointing.py:794] Waiting for step 0 to finish before checkpoint...
I0422 15:53:23.458912 140014694840128 checkpointing.py:798] Waited 0.15382790565490723 seconds for step 0 to finish before starting checkpointing.
I0422 15:53:23.461260 140014694840128 checkpoint_manager.py:2013] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0422 15:53:23.462866 140014694840128 checkpoint_manager.py:1518] [process=6] Saving checkpoint at step 0
I0422 15:53:23.465631 140014694840128 async_checkpointer.py:452] [process=6] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260422_154647/linen_xpk_feat_nnx_set_defaults_true_20260422_154647_02_synthetic/checkpoints/0.
I0422 15:53:24.167091 140014694840128 signaling_client.py:364] Using JaxDistributedSignalingClient
I0422 15:53:24.168293 140014694840128 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0422 15:53:24.168351 140014694840128 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
I0422 15:53:24.417499 140014694840128 base_pytree_checkpoint_handler.py:153] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.250484s
I0422 15:53:24.417668 140014694840128 base_pytree_checkpoint_handler.py:129] [process=6] /jax/checkpoint/write/blocking_gbytes_per_sec: 2.802 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.5504834651947021 s) (per-host)
I0422 15:53:24.417720 140014694840128 base_pytree_checkpoint_handler.py:737] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.550546s (batch_requests_ready=0.296417s, total_serialization_initiated=0.254058s, others=0.000071s)
I0422 15:53:24.417806 140014694840128 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.554567s (all_items=0.000019s, per_item={'items': '0.00001931'}, temp_paths=0.554548)
I0422 15:53:24.418732 139888041981696 async_checkpointer.py:79] [process=6][thread=async_save] Background save thread started.
I0422 15:53:24.418858 140014694840128 async_checkpointer.py:561] Finished blocking save. Time taken: 0.955920s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260422_154647/linen_xpk_feat_nnx_set_defaults_true_20260422_154647_02_synthetic/checkpoints/0.
I0422 15:53:24.431082 140014694840128 checkpoint_manager.py:1566] [process=6][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize
I0422 15:53:24.431336 139888586368768 async_checkpointer.py:265] [process=6][thread=save_finalize] Waiting for background save thread=async_save.
I0422 15:53:24.431463 140014694840128 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260422_154647/linen_xpk_feat_nnx_set_defaults_true_20260422_154647_02_synthetic/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776873203.4612424, 'wait_for_prev_duration_secs': 6.461143493652344e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776873203.4629068, 'checkpointer_blocking_duration_secs': 0.956141471862793, 'get_old_steps_start_time': 1776873204.419068, 'get_old_steps_duration_secs': 3.695487976074219e-05, 'checkpoint_manager_blocking_start_time': 1776873203.4595175, 'checkpoint_manager_blocking_duration_secs': 0.9719078540802002}
I0422 15:53:24.431561 140014694840128 checkpointing.py:409] Started an asynchronous checkpoint save for step 0
I0422 15:53:24.431610 140014694840128 max_utils.py:750]
Memstats: After params initialized:
I0422 15:53:24.431656 140014694840128 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_24(process=6,(0,6,0,0))
I0422 15:53:24.431689 140014694840128 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_25(process=6,(1,6,0,0))
I0422 15:53:24.431715 140014694840128 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_28(process=6,(0,7,0,0))
I0422 15:53:24.431740 140014694840128 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_29(process=6,(1,7,0,0))
I0422 15:53:24.696937 140014694840128 metric_logger.py:185] completed step: 0, seconds: 11.055, TFLOP/s/device: 1.229, Tokens/s/device: 185.249, total_weights: 65536, loss: 10.874
I0422 15:53:24.879273 140014694840128 metric_logger.py:185] completed step: 1, seconds: 1.391, TFLOP/s/device: 9.771, Tokens/s/device: 1472.791, total_weights: 65536, loss: 10.874
I0422 15:53:25.301930 140014694840128 metric_logger.py:185] completed step: 2, seconds: 0.035, TFLOP/s/device: 387.296, Tokens/s/device: 58377.516, total_weights: 65536, loss: 10.263
I0422 15:53:25.449335 140014694840128 metric_logger.py:185] completed step: 3, seconds: 0.423, TFLOP/s/device: 32.113, Tokens/s/device: 4840.406, total_weights: 65536, loss: 9.734
I0422 15:53:25.744381 140014694840128 metric_logger.py:185] completed step: 4, seconds: 0.152, TFLOP/s/device: 89.119, Tokens/s/device: 13433.032, total_weights: 65536, loss: 9.278
I0422 15:53:25.750179 140014694840128 metric_logger.py:185] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.142, Tokens/s/device: 13888.606, total_weights: 65536, loss: 8.892
I0422 15:53:44.650484 140014694840128 metric_logger.py:185] completed step: 6, seconds: 0.296, TFLOP/s/device: 45.950, Tokens/s/device: 6926.079, total_weights: 65536, loss: 8.592
I0422 15:53:44.797973 140014694840128 metric_logger.py:185] completed step: 7, seconds: 18.754, TFLOP/s/device: 0.725, Tokens/s/device: 109.205, total_weights: 65536, loss: 8.384
I0422 15:53:44.945371 140014694840128 metric_logger.py:185] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.380, Tokens/s/device: 13472.266, total_weights: 65536, loss: 8.255
I0422 15:53:45.092478 140014694840128 checkpointing.py:794] Waiting for step 9 to finish before checkpoint...
I0422 15:53:45.093126 140014694840128 checkpointing.py:798] Waited 0.0006437301635742188 seconds for step 9 to finish before starting checkpointing.
I0422 15:53:45.095106 140014694840128 checkpoint_manager.py:2024] [process=6][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0422 15:53:46.988430 2641 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com
I0422 15:53:50.362630 139888050374400 array_metadata_store.py:203] [process=6][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260422_154647/linen_xpk_feat_nnx_set_defaults_true_20260422_154647_02_synthetic/checkpoints/0/items/array_metadatas/process_6
I0422 15:54:21.095857 139888041981696 base_pytree_checkpoint_handler.py:129] [process=6] /jax/checkpoint/write/gbytes_per_sec: 27.602 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 57.228639364242554 s) (per-host)
I0422 15:54:21.095959 139888041981696 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 56.677026s.
I0422 15:54:29.003360 139888041981696 async_checkpointer.py:144] [process=6][thread=async_save] Background save thread done. Time taken: 64.584410s.
I0422 15:54:29.003697 139888586368768 async_checkpointer.py:273] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save.
I0422 15:54:29.003828 139888586368768 async_checkpointer.py:283] [process=6][thread=save_finalize] No errors found in background save thread=async_save.
I0422 15:54:29.003876 139888586368768 checkpoint_manager.py:2133] [process=6][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts...
I0422 15:54:29.005234 139888586368768 checkpoint_manager.py:2142] [process=6][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts.
I0422 15:54:29.005428 140014694840128 checkpoint_manager.py:2036] [process=6][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0.
W0422 15:54:29.005602 140014694840128 checkpoint_manager.py:1458] Waiting for previous save to complete took 43.910514 seconds. If this number is high, consider checkpointing less frequently.
I0422 15:54:29.007377 140014694840128 checkpoint_manager.py:1518] [process=6] Saving checkpoint at step 9
I0422 15:54:29.010918 140014694840128 async_checkpointer.py:452] [process=6] Started async saving checkpoint to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260422_154647/linen_xpk_feat_nnx_set_defaults_true_20260422_154647_02_synthetic/checkpoints/9.
I0422 15:54:29.612042 140014694840128 jax_array_handlers.py:358] Scheduling D2H of 39 prioritized jax.Array.
I0422 15:54:29.612155 140014694840128 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
I0422 15:54:29.657617 140014694840128 base_pytree_checkpoint_handler.py:153] [process=6][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.046772s
I0422 15:54:29.657788 140014694840128 base_pytree_checkpoint_handler.py:129] [process=6] /jax/checkpoint/write/blocking_gbytes_per_sec: 4.805 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.321012020111084 s) (per-host)
I0422 15:54:29.657844 140014694840128 base_pytree_checkpoint_handler.py:737] [process=6][thread=MainThread] Initiated Pytree async_save. Time taken: 0.321077s (batch_requests_ready=0.272415s, total_serialization_initiated=0.048588s, others=0.000074s)
I0422 15:54:29.657932 140014694840128 composite_checkpoint_handler.py:715] [process=6][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.325118s (all_items=0.000016s, per_item={'items': '0.00001574'}, temp_paths=0.325102)
I0422 15:54:29.658814 139887529412352 async_checkpointer.py:79] [process=6][thread=async_save] Background save thread started.
I0422 15:54:29.658971 140014694840128 async_checkpointer.py:561] Finished blocking save. Time taken: 0.651522s. Continuing background save to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260422_154647/linen_xpk_feat_nnx_set_defaults_true_20260422_154647_02_synthetic/checkpoints/9.
I0422 15:54:30.015003 140014694840128 checkpoint_manager.py:1566] [process=6][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize
I0422 15:54:30.015385 139888586368768 async_checkpointer.py:265] [process=6][thread=save_finalize] Waiting for background save thread=async_save.
I0422 15:54:30.015564 140014694840128 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260422_154647/linen_xpk_feat_nnx_set_defaults_true_20260422_154647_02_synthetic/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776873225.0950649, 'wait_for_prev_duration_secs': 43.91051363945007, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776873269.0074155, 'checkpointer_blocking_duration_secs': 0.6516621112823486, 'get_old_steps_start_time': 1776873269.6591065, 'get_old_steps_duration_secs': 2.5272369384765625e-05, 'checkpoint_manager_blocking_start_time': 1776873225.0933576, 'checkpoint_manager_blocking_duration_secs': 44.922168254852295}
I0422 15:54:30.015685 140014694840128 checkpointing.py:409] Started an asynchronous checkpoint save for step 9
I0422 15:54:30.015732 140014694840128 checkpoint_manager.py:2024] [process=6][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete.
I0422 15:54:35.551032 139888050374400 array_metadata_store.py:203] [process=6][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_set_defaults_true_20260422_154647/linen_xpk_feat_nnx_set_defaults_true_20260422_154647_02_synthetic/checkpoints/9/items/array_metadatas/process_6
I0422 15:55:11.799145 139887529412352 base_pytree_checkpoint_handler.py:129] [process=6] /jax/checkpoint/write/gbytes_per_sec: 37.200 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.46230888366699 s) (per-host)
I0422 15:55:11.799273 139887529412352 async_checkpointer.py:90] [process=6][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.140350s.
I0422 15:55:20.405002 139887529412352 async_checkpointer.py:144] [process=6][thread=async_save] Background save thread done. Time taken: 50.746065s.
I0422 15:55:20.405262 139888586368768 async_checkpointer.py:273] [process=6][thread=save_finalize] Done with waiting for background save thread=async_save.
I0422 15:55:20.405318 139888586368768 async_checkpointer.py:283] [process=6][thread=save_finalize] No errors found in background save thread=async_save.
I0422 15:55:20.405363 139888586368768 checkpoint_manager.py:2133] [process=6][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts...
I0422 15:55:20.406901 139888586368768 checkpoint_manager.py:2142] [process=6][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts.
I0422 15:55:20.407068 140014694840128 checkpoint_manager.py:2036] [process=6][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9.
I0422 15:55:20.407225 140014694840128 checkpoint_manager.py:2013] [process=6][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning.
I0422 15:55:20.407847 140014694840128 metric_logger.py:185] completed step: 9, seconds: 0.148, TFLOP/s/device: 92.009, Tokens/s/device: 13868.574, total_weights: 65536, loss: 8.179
Per train step:
Total TFLOPs: 13.59
split as 93.93% learnable weight flops and 6.07% attention flops
XPK End: Wed Apr 22 15:55:31 UTC 2026
EXIT_CODE=0