XPK Start: Mon Apr 20 12:17:49 UTC 2026 PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used. 2026-04-20 12:18:28.298659: 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) I0420 12:18:28.476992 135529016764224 max_utils.py:273] Attempting to initialize the jax distributed system... I0420 12:18:37.517746 135529016764224 distributed.py:149] Starting JAX distributed service on [::]:8482 I0420 12:18:37.520076 135529016764224 distributed.py:172] Connecting to JAX distributed service on mt-01-base-y3ynp-slice-job-0-0.mt-01-base-y3ynp:8482 I0420 12:18:49.810367 135529016764224 max_utils.py:284] Jax distributed system initialized! I0420 12:18:55.970150 135529016764224 max_utils.py:800] System Information: Jax Version: 0.9.2 I0420 12:18:55.970251 135529016764224 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0420 12:18:55.970290 135529016764224 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 I0420 12:18:55.970323 135529016764224 train_utils.py:378] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0420 12:18:57.027312 135529016764224 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0420 12:18:57.027931 135529016764224 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0420 12:18:57.028112 135529016764224 checkpointing.py:688] Setting up checkpoint logger... I0420 12:18:57.028163 135529016764224 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0420 12:18:57.028205 135529016764224 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0420 12:18:57.028574 135529016764224 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 0x7b429a53a600>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0420 12:19:00.708730 135529016764224 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0420 12:19:00.708926 135529016764224 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 0x7b418b69dc70>}, handler_registry=None I0420 12:19:00.709163 135529016764224 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7b418b69dc70>` 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`. I0420 12:19:00.709210 135529016764224 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7b418b6aa9f0>` 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`. I0420 12:19:00.709244 135529016764224 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 0x7b418b69dc70>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7b418b69dc70>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7b418b6aa9f0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7b418b6aa9f0>}). I0420 12:19:00.709584 135529016764224 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0420 12:19:00.709655 135529016764224 async_checkpointer.py:192] [process=5][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7b418b88b920> timeout: 1200 secs and primary_host=0 for async checkpoint writes I0420 12:19:02.286629 135529016764224 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/linen_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_01_base/checkpoints I0420 12:19:02.493302 135529016764224 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_linen_converter_and_sharding_tools_20260420_112158/linen_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_01_base/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7b418b69e570> I0420 12:19:02.493513 135529016764224 checkpointing.py:302] Checkpoint manager created! I0420 12:19:03.411871 135529016764224 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0420 12:19:03.411971 135529016764224 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 12:19:03.789970 135529016764224 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0420 12:19:03.790060 135529016764224 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 12:19:03.811848 135529016764224 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0420 12:19:03.811945 135529016764224 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0420 12:19:03.835558 135529016764224 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0420 12:19:03.835632 135529016764224 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 12:19:03.851624 135529016764224 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0420 12:19:03.851678 135529016764224 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 12:19:03.867632 135529016764224 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0420 12:19:03.867688 135529016764224 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 12:19:03.891891 135529016764224 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0420 12:19:03.891963 135529016764224 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0420 12:19:03.912689 135529016764224 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0420 12:19:03.912755 135529016764224 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0420 12:19:04.125044 135529016764224 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0420 12:19:04.125149 135529016764224 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0420 12:19:05.532649 135529016764224 maxtext_utils.py:1827] params/params/decoder/decoder_norm/scale Shape: float32[2048] Logical: P('norm',) Physical: (None,) I0420 12:19:05.532774 135529016764224 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) I0420 12:19:05.532826 135529016764224 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) I0420 12:19:05.532890 135529016764224 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') I0420 12:19:05.532942 135529016764224 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) I0420 12:19:05.532980 135529016764224 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) I0420 12:19:05.533034 135529016764224 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) I0420 12:19:05.533086 135529016764224 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') I0420 12:19:05.533126 135529016764224 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) I0420 12:19:05.533162 135529016764224 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) I0420 12:19:05.533208 135529016764224 maxtext_utils.py:1827] params/params/decoder/logits_dense/kernel Shape: float32[2048,32000] Logical: P('embed_vocab', 'vocab') Physical: ('fsdp', None) I0420 12:19:05.533254 135529016764224 maxtext_utils.py:1827] params/params/token_embedder/embedding Shape: float32[32000,2048] Logical: P('vocab', 'embed_vocab') Physical: (None, 'fsdp') I0420 12:19:06.018768 135529016764224 train.py:157] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0420 12:19:06.018861 135529016764224 train.py:157] train/xent Physical: float32[32,2048]............................................ ('fsdp', None). I0420 12:19:06.034258 135529016764224 train.py:164] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0420 12:19:06.034314 135529016764224 train.py:164] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None). I0420 12:19:17.025528 135529016764224 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. I0420 12:19:17.026338 135529016764224 metric_logger.py:301] number parameters: 1.104 billion I0420 12:19:28.167001 135529016764224 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0420 12:19:28.321637 135529016764224 checkpointing.py:798] Waited 0.15460920333862305 seconds for step 0 to finish before starting checkpointing. I0420 12:19:28.324071 135529016764224 checkpoint_manager.py:2009] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0420 12:19:28.325769 135529016764224 checkpoint_manager.py:1512] [process=5] Saving checkpoint at step 0 I0420 12:19:28.327308 135529016764224 event_tracking.py:70] [process=5] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/linen_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_01_base/checkpoints/0. I0420 12:19:28.673013 135529016764224 signaling_client.py:364] Using JaxDistributedSignalingClient I0420 12:19:28.673886 135529016764224 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array. I0420 12:19:28.673941 135529016764224 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 I0420 12:19:28.947386 135529016764224 base_pytree_checkpoint_handler.py:154] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.274446s I0420 12:19:28.947585 135529016764224 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/blocking_gbytes_per_sec: 5.506 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.28018760681152344 s) (per-host) I0420 12:19:28.947645 135529016764224 base_pytree_checkpoint_handler.py:768] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.280265s (batch_requests_ready=0.002485s, total_serialization_initiated=0.277695s, others=0.000085s) I0420 12:19:28.947738 135529016764224 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.284414s (all_items=0.000018s, per_item={'items': '0.00001764'}, temp_paths=0.284397) I0420 12:19:28.948547 135529016764224 event_tracking.py:125] [process=5] [async] Finished blocking save in 0.62 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/linen_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_01_base/checkpoints/0. I0420 12:19:28.948827 135400816002816 async_checkpointer.py:76] [process=5][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 12:39:28.948795 I0420 12:19:28.954306 135529016764224 checkpoint_manager.py:1560] [process=5][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0420 12:19:28.954540 135398659294976 async_checkpointer.py:280] [process=5][thread=save_finalize] Waiting for background save thread=async_save. I0420 12:19:28.954658 135529016764224 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/linen_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_01_base/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776687568.3240519, 'wait_for_prev_duration_secs': 6.222724914550781e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776687568.325806, 'checkpointer_blocking_duration_secs': 0.6231718063354492, 'get_old_steps_start_time': 1776687568.9490047, 'get_old_steps_duration_secs': 2.9802322387695312e-05, 'checkpoint_manager_blocking_start_time': 1776687568.3221164, 'checkpoint_manager_blocking_duration_secs': 0.6325044631958008} I0420 12:19:28.954772 135529016764224 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0420 12:19:28.954821 135529016764224 max_utils.py:750] Memstats: After params initialized: I0420 12:19:28.954874 135529016764224 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_18(process=5,(2,4,0,0)) I0420 12:19:28.954905 135529016764224 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_19(process=5,(3,4,0,0)) I0420 12:19:28.954933 135529016764224 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_22(process=5,(2,5,0,0)) I0420 12:19:28.954958 135529016764224 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_23(process=5,(3,5,0,0)) I0420 12:19:29.263501 135529016764224 metric_logger.py:196] completed step: 0, seconds: 11.141, TFLOP/s/device: 1.220, Tokens/s/device: 183.833, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875 I0420 12:19:29.444770 135529016764224 metric_logger.py:196] completed step: 1, seconds: 1.095, TFLOP/s/device: 12.408, Tokens/s/device: 1870.292, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875 I0420 12:19:29.868711 135529016764224 metric_logger.py:196] completed step: 2, seconds: 0.034, TFLOP/s/device: 398.988, Tokens/s/device: 60139.778, total_weights: 65536, loss: 10.262, lm_loss: 10.262, perplexity: 28637.129 I0420 12:19:30.016076 135529016764224 metric_logger.py:196] completed step: 3, seconds: 0.424, TFLOP/s/device: 32.022, Tokens/s/device: 4826.728, total_weights: 65536, loss: 9.734, lm_loss: 9.734, perplexity: 16889.203 I0420 12:19:30.311154 135529016764224 metric_logger.py:196] completed step: 4, seconds: 0.153, TFLOP/s/device: 88.843, Tokens/s/device: 13391.310, total_weights: 65536, loss: 9.277, lm_loss: 9.277, perplexity: 10694.614 I0420 12:19:30.317148 135529016764224 metric_logger.py:196] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.303, Tokens/s/device: 13912.854, total_weights: 65536, loss: 8.892, lm_loss: 8.892, perplexity: 7270.717 I0420 12:19:31.861367 2829 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0420 12:19:33.787721 135398667687680 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_linen_converter_and_sharding_tools_20260420_112158/linen_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_01_base/checkpoints/0/items/array_metadatas/process_5 I0420 12:19:52.889740 135529016764224 metric_logger.py:196] completed step: 6, seconds: 0.296, TFLOP/s/device: 45.953, Tokens/s/device: 6926.571, total_weights: 65536, loss: 8.592, lm_loss: 8.592, perplexity: 5390.759 I0420 12:19:53.037125 135529016764224 metric_logger.py:196] completed step: 7, seconds: 22.426, TFLOP/s/device: 0.606, Tokens/s/device: 91.323, total_weights: 65536, loss: 8.384, lm_loss: 8.384, perplexity: 4376.905 I0420 12:19:53.184419 135529016764224 metric_logger.py:196] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.221, Tokens/s/device: 13448.380, total_weights: 65536, loss: 8.255, lm_loss: 8.255, perplexity: 3846.406 I0420 12:19:53.331186 135529016764224 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0420 12:19:53.331877 135529016764224 checkpointing.py:798] Waited 0.0007114410400390625 seconds for step 9 to finish before starting checkpointing. I0420 12:19:53.333962 135529016764224 checkpoint_manager.py:2020] [process=5][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0420 12:20:05.287609 135400816002816 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/gbytes_per_sec: 43.135 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 36.620171785354614 s) (per-host) I0420 12:20:05.287731 135400816002816 async_checkpointer.py:90] [process=5][thread=async_save] 3 Handler Commit operations completed. Time taken: 36.338795s. I0420 12:20:15.264335 135400816002816 async_checkpointer.py:160] [process=5][thread=async_save] Background save thread done. Time taken: 46.315382s. I0420 12:20:15.264564 135398659294976 async_checkpointer.py:288] [process=5][thread=save_finalize] Done with waiting for background save thread=async_save. I0420 12:20:15.264634 135398659294976 async_checkpointer.py:298] [process=5][thread=save_finalize] No errors found in background save thread=async_save. I0420 12:20:15.264706 135398659294976 checkpoint_manager.py:2137] [process=5][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0420 12:20:15.266690 135398659294976 checkpoint_manager.py:2146] [process=5][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0420 12:20:15.266868 135529016764224 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. W0420 12:20:15.267009 135529016764224 checkpoint_manager.py:1452] Waiting for previous save to complete took 21.933047 seconds. If this number is high, consider checkpointing less frequently. I0420 12:20:15.268744 135529016764224 checkpoint_manager.py:1512] [process=5] Saving checkpoint at step 9 I0420 12:20:15.270801 135529016764224 event_tracking.py:70] [process=5] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/linen_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_01_base/checkpoints/9. I0420 12:20:15.607829 135529016764224 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array. I0420 12:20:15.607925 135529016764224 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 I0420 12:20:15.649953 135529016764224 base_pytree_checkpoint_handler.py:154] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.043308s I0420 12:20:15.650120 135529016764224 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/blocking_gbytes_per_sec: 32.997 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.04674863815307617 s) (per-host) I0420 12:20:15.650171 135529016764224 base_pytree_checkpoint_handler.py:768] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.046808s (batch_requests_ready=0.001782s, total_serialization_initiated=0.044960s, others=0.000066s) I0420 12:20:15.650279 135529016764224 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.050867s (all_items=0.000015s, per_item={'items': '0.00001526'}, temp_paths=0.050852) I0420 12:20:15.651062 135529016764224 event_tracking.py:125] [process=5] [async] Finished blocking save in 0.38 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/linen_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_01_base/checkpoints/9. I0420 12:20:15.651441 135398659294976 async_checkpointer.py:76] [process=5][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-20 12:40:15.651404 I0420 12:20:15.653780 135529016764224 checkpoint_manager.py:1560] [process=5][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0420 12:20:15.654083 135398667687680 async_checkpointer.py:280] [process=5][thread=save_finalize] Waiting for background save thread=async_save. I0420 12:20:15.654249 135529016764224 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158/linen_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_01_base/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776687593.3339307, 'wait_for_prev_duration_secs': 21.93304705619812, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776687615.2687833, 'checkpointer_blocking_duration_secs': 0.3828291893005371, 'get_old_steps_start_time': 1776687615.6516407, 'get_old_steps_duration_secs': 3.7670135498046875e-05, 'checkpoint_manager_blocking_start_time': 1776687593.3321037, 'checkpoint_manager_blocking_duration_secs': 22.32210636138916} I0420 12:20:15.654390 135529016764224 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0420 12:20:15.654440 135529016764224 checkpoint_manager.py:2020] [process=5][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0420 12:20:21.749699 135378208012032 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_linen_converter_and_sharding_tools_20260420_112158/linen_xpk_feat_nnx_linen_converter_and_sharding_tools_20260420_112158_01_base/checkpoints/9/items/array_metadatas/process_5 I0420 12:20:57.770607 135398659294976 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/gbytes_per_sec: 37.460 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.16719579696655 s) (per-host) I0420 12:20:57.770744 135398659294976 async_checkpointer.py:90] [process=5][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.119175s. I0420 12:21:06.912689 135398659294976 async_checkpointer.py:160] [process=5][thread=async_save] Background save thread done. Time taken: 51.261106s. I0420 12:21:06.913016 135398667687680 async_checkpointer.py:288] [process=5][thread=save_finalize] Done with waiting for background save thread=async_save. I0420 12:21:06.913130 135398667687680 async_checkpointer.py:298] [process=5][thread=save_finalize] No errors found in background save thread=async_save. I0420 12:21:06.913178 135398667687680 checkpoint_manager.py:2137] [process=5][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0420 12:21:06.914768 135398667687680 checkpoint_manager.py:2146] [process=5][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0420 12:21:06.914944 135529016764224 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. I0420 12:21:06.915109 135529016764224 checkpoint_manager.py:2009] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0420 12:21:06.916003 135529016764224 metric_logger.py:196] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.161, Tokens/s/device: 13891.527, 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: Mon Apr 20 12:21:19 UTC 2026 EXIT_CODE=0