XPK Start: Fri Apr 17 13:02:34 UTC 2026 PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used. 2026-04-17 13:03:13.074350: 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) I0417 13:03:13.253283 139061378029376 max_utils.py:273] Attempting to initialize the jax distributed system... I0417 13:03:22.295288 139061378029376 distributed.py:172] Connecting to JAX distributed service on mt-01-base-dw36o-slice-job-0-0.mt-01-base-dw36o:8482 I0417 13:03:34.081101 139061378029376 max_utils.py:284] Jax distributed system initialized! I0417 13:03:40.307551 139061378029376 max_utils.py:800] System Information: Jax Version: 0.9.2 I0417 13:03:40.307657 139061378029376 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0417 13:03:40.307709 139061378029376 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 I0417 13:03:40.307744 139061378029376 train_utils.py:348] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0417 13:03:41.349306 139061378029376 maxtext_utils.py:1548] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0417 13:03:41.349585 139061378029376 checkpointing.py:677] Setting up checkpoint logger... I0417 13:03:41.349640 139061378029376 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True I0417 13:03:41.349696 139061378029376 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0417 13:03:41.350032 139061378029376 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 0x7e79295f3110>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0417 13:03:47.246954 139061378029376 checkpointing.py:265] Enabling policy for fixed interval checkpointing. I0417 13:03:47.247190 139061378029376 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 0x7e77fc161550>}, handler_registry=None I0417 13:03:47.247426 139061378029376 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7e77fc161550>` 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`. I0417 13:03:47.247475 139061378029376 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e77fc160f80>` 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`. I0417 13:03:47.247510 139061378029376 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 0x7e77fc161550>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7e77fc161550>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e77fc160f80>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e77fc160f80>}). I0417 13:03:47.247847 139061378029376 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0417 13:03:47.247917 139061378029376 async_checkpointer.py:192] [process=5][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7e665c7540e0> timeout: 1200 secs and primary_host=0 for async checkpoint writes I0417 13:03:50.918818 139061378029376 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_main_20260417_125726/linen_xpk_main_20260417_125726_01_base/checkpoints I0417 13:03:50.921055 139061378029376 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_20260417_125726/linen_xpk_main_20260417_125726_01_base/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7e77fc227cb0> I0417 13:03:50.921163 139061378029376 checkpointing.py:301] Checkpoint manager created! I0417 13:03:51.846249 139061378029376 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0417 13:03:51.846359 139061378029376 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0417 13:03:52.224160 139061378029376 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0417 13:03:52.224248 139061378029376 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0417 13:03:52.240210 139061378029376 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0417 13:03:52.240270 139061378029376 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0417 13:03:52.263463 139061378029376 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0417 13:03:52.263527 139061378029376 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0417 13:03:52.279788 139061378029376 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0417 13:03:52.279848 139061378029376 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0417 13:03:52.295936 139061378029376 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0417 13:03:52.295996 139061378029376 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0417 13:03:52.321132 139061378029376 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0417 13:03:52.321202 139061378029376 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0417 13:03:52.341792 139061378029376 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0417 13:03:52.341857 139061378029376 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0417 13:03:52.554485 139061378029376 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint I0417 13:03:52.554589 139061378029376 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0417 13:03:53.960474 139061378029376 maxtext_utils.py:1651] params/params/decoder/decoder_norm/scale Shape: float32[2048] Logical: P('norm',) Physical: (None,) I0417 13:03:53.960595 139061378029376 maxtext_utils.py:1651] params/params/decoder/layers/mlp/wi_0/kernel Shape: float32[2048,16,7168] Logical: P('embed', 'layers', 'mlp') Physical: ('fsdp', None, None) I0417 13:03:53.960646 139061378029376 maxtext_utils.py:1651] params/params/decoder/layers/mlp/wi_1/kernel Shape: float32[2048,16,7168] Logical: P('embed', 'layers', 'mlp') Physical: ('fsdp', None, None) I0417 13:03:53.960714 139061378029376 maxtext_utils.py:1651] params/params/decoder/layers/mlp/wo/kernel Shape: float32[7168,16,2048] Logical: P('mlp', 'layers', 'embed') Physical: (None, None, 'fsdp') I0417 13:03:53.960768 139061378029376 maxtext_utils.py:1651] params/params/decoder/layers/post_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: P('norm', 'layers') Physical: (None, None) I0417 13:03:53.960808 139061378029376 maxtext_utils.py:1651] params/params/decoder/layers/pre_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: P('norm', 'layers') Physical: (None, None) I0417 13:03:53.960879 139061378029376 maxtext_utils.py:1651] 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) I0417 13:03:53.960931 139061378029376 maxtext_utils.py:1651] 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') I0417 13:03:53.960973 139061378029376 maxtext_utils.py:1651] 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) I0417 13:03:53.961027 139061378029376 maxtext_utils.py:1651] 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) I0417 13:03:53.961097 139061378029376 maxtext_utils.py:1651] params/params/decoder/logits_dense/kernel Shape: float32[2048,32000] Logical: P('embed_vocab', 'vocab') Physical: ('fsdp', None) I0417 13:03:53.961153 139061378029376 maxtext_utils.py:1651] params/params/token_embedder/embedding Shape: float32[32000,2048] Logical: P('vocab', 'embed_vocab') Physical: (None, 'fsdp') I0417 13:03:54.445749 139061378029376 train.py:155] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0417 13:03:54.445838 139061378029376 train.py:155] train/xent Physical: float32[32,2048]............................................ ('fsdp', None). I0417 13:03:54.461082 139061378029376 train.py:162] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0417 13:03:54.461144 139061378029376 train.py:162] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None). I0417 13:04:04.700019 139061378029376 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. I0417 13:04:04.700795 139061378029376 metric_logger.py:301] number parameters: 1.104 billion I0417 13:04:15.505250 139061378029376 checkpointing.py:772] Waiting for step 0 to finish before checkpoint... I0417 13:04:16.635451 139061378029376 checkpointing.py:776] Waited 1.1301853656768799 seconds for step 0 to finish before starting checkpointing. I0417 13:04:16.638133 139061378029376 checkpoint_manager.py:2009] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0417 13:04:16.640230 139061378029376 checkpoint_manager.py:1512] [process=5] Saving checkpoint at step 0 I0417 13:04:16.641477 139061378029376 event_tracking.py:70] [process=5] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260417_125726/linen_xpk_main_20260417_125726_01_base/checkpoints/0. I0417 13:04:17.834601 139061378029376 signaling_client.py:364] Using JaxDistributedSignalingClient I0417 13:04:17.835660 139061378029376 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array. I0417 13:04:17.835736 139061378029376 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 I0417 13:04:18.112644 139061378029376 base_pytree_checkpoint_handler.py:154] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.278116s I0417 13:04:18.112825 139061378029376 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/blocking_gbytes_per_sec: 5.437 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.28372764587402344 s) (per-host) I0417 13:04:18.112878 139061378029376 base_pytree_checkpoint_handler.py:768] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.283791s (batch_requests_ready=0.002327s, total_serialization_initiated=0.281392s, others=0.000072s) I0417 13:04:18.112993 139061378029376 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.287707s (all_items=0.000018s, per_item={'items': '0.00001836'}, temp_paths=0.287689) I0417 13:04:18.113808 139061378029376 event_tracking.py:125] [process=5] [async] Finished blocking save in 1.47 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260417_125726/linen_xpk_main_20260417_125726_01_base/checkpoints/0. I0417 13:04:18.114148 138922593179392 async_checkpointer.py:76] [process=5][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-17 13:24:18.114110 I0417 13:04:18.121369 139061378029376 checkpoint_manager.py:1560] [process=5][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0417 13:04:18.121631 138917936359168 async_checkpointer.py:280] [process=5][thread=save_finalize] Waiting for background save thread=async_save. I0417 13:04:18.121755 139061378029376 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260417_125726/linen_xpk_main_20260417_125726_01_base/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776431056.6381137, 'wait_for_prev_duration_secs': 6.008148193359375e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776431056.6402736, 'checkpointer_blocking_duration_secs': 1.4740350246429443, 'get_old_steps_start_time': 1776431058.114334, 'get_old_steps_duration_secs': 3.075599670410156e-05, 'checkpoint_manager_blocking_start_time': 1776431056.636006, 'checkpoint_manager_blocking_duration_secs': 1.485710620880127} I0417 13:04:18.121910 139061378029376 checkpointing.py:408] Started an asynchronous checkpoint save for step 0 I0417 13:04:18.121960 139061378029376 max_utils.py:750] Memstats: After params initialized: I0417 13:04:18.122009 139061378029376 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_18(process=5,(2,4,0,0)) I0417 13:04:18.122040 139061378029376 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_19(process=5,(3,4,0,0)) I0417 13:04:18.122067 139061378029376 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_22(process=5,(2,5,0,0)) I0417 13:04:18.122091 139061378029376 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_23(process=5,(3,5,0,0)) I0417 13:04:18.442850 139061378029376 metric_logger.py:196] completed step: 0, seconds: 10.804, TFLOP/s/device: 1.258, Tokens/s/device: 189.553, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875 I0417 13:04:18.606886 139061378029376 metric_logger.py:196] completed step: 1, seconds: 2.936, TFLOP/s/device: 4.628, Tokens/s/device: 697.525, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875 I0417 13:04:19.026113 139061378029376 metric_logger.py:196] completed step: 2, seconds: 0.017, TFLOP/s/device: 821.272, Tokens/s/device: 123791.103, total_weights: 65536, loss: 10.262, lm_loss: 10.262, perplexity: 28637.129 I0417 13:04:19.173369 139061378029376 metric_logger.py:196] completed step: 3, seconds: 0.420, TFLOP/s/device: 32.383, Tokens/s/device: 4881.048, total_weights: 65536, loss: 9.734, lm_loss: 9.734, perplexity: 16889.203 I0417 13:04:19.468361 139061378029376 metric_logger.py:196] completed step: 4, seconds: 0.153, TFLOP/s/device: 88.825, Tokens/s/device: 13388.596, total_weights: 65536, loss: 9.277, lm_loss: 9.277, perplexity: 10694.614 I0417 13:04:19.474195 139061378029376 metric_logger.py:196] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.291, Tokens/s/device: 13911.153, total_weights: 65536, loss: 8.892, lm_loss: 8.892, perplexity: 7270.717 I0417 13:04:27.339842 2546 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0417 13:04:31.526099 138921044875008 array_metadata_store.py:203] [process=5][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260417_125726/linen_xpk_main_20260417_125726_01_base/checkpoints/0/items/array_metadatas/process_5 I0417 13:04:46.404038 139061378029376 metric_logger.py:196] completed step: 6, seconds: 0.296, TFLOP/s/device: 45.975, Tokens/s/device: 6929.876, total_weights: 65536, loss: 8.592, lm_loss: 8.592, perplexity: 5390.759 I0417 13:04:46.551280 139061378029376 metric_logger.py:196] completed step: 7, seconds: 26.783, TFLOP/s/device: 0.507, Tokens/s/device: 76.467, total_weights: 65536, loss: 8.384, lm_loss: 8.384, perplexity: 4376.905 I0417 13:04:46.698525 139061378029376 metric_logger.py:196] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.119, Tokens/s/device: 13433.032, total_weights: 65536, loss: 8.255, lm_loss: 8.255, perplexity: 3846.406 I0417 13:04:46.845354 139061378029376 checkpointing.py:772] Waiting for step 9 to finish before checkpoint... I0417 13:04:46.846024 139061378029376 checkpointing.py:776] Waited 0.000690460205078125 seconds for step 9 to finish before starting checkpointing. I0417 13:04:46.848272 139061378029376 checkpoint_manager.py:2020] [process=5][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0417 13:05:02.283326 138922593179392 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/gbytes_per_sec: 35.533 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 44.45418667793274 s) (per-host) I0417 13:05:02.283447 138922593179392 async_checkpointer.py:90] [process=5][thread=async_save] 3 Handler Commit operations completed. Time taken: 44.169186s. I0417 13:05:15.824184 138922593179392 async_checkpointer.py:160] [process=5][thread=async_save] Background save thread done. Time taken: 57.709906s. I0417 13:05:15.824479 138917936359168 async_checkpointer.py:288] [process=5][thread=save_finalize] Done with waiting for background save thread=async_save. I0417 13:05:15.824605 138917936359168 async_checkpointer.py:298] [process=5][thread=save_finalize] No errors found in background save thread=async_save. I0417 13:05:15.824655 138917936359168 checkpoint_manager.py:2137] [process=5][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0417 13:05:15.825946 138917936359168 checkpoint_manager.py:2146] [process=5][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0417 13:05:15.826111 139061378029376 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. W0417 13:05:15.826269 139061378029376 checkpoint_manager.py:1452] Waiting for previous save to complete took 28.977986 seconds. If this number is high, consider checkpointing less frequently. I0417 13:05:15.828040 139061378029376 checkpoint_manager.py:1512] [process=5] Saving checkpoint at step 9 I0417 13:05:15.830111 139061378029376 event_tracking.py:70] [process=5] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260417_125726/linen_xpk_main_20260417_125726_01_base/checkpoints/9. I0417 13:05:16.967411 139061378029376 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array. I0417 13:05:16.967506 139061378029376 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 I0417 13:05:17.000762 139061378029376 base_pytree_checkpoint_handler.py:154] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.034511s I0417 13:05:17.000943 139061378029376 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/blocking_gbytes_per_sec: 40.541 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.03804945945739746 s) (per-host) I0417 13:05:17.000996 139061378029376 base_pytree_checkpoint_handler.py:768] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.038113s (batch_requests_ready=0.001903s, total_serialization_initiated=0.036139s, others=0.000070s) I0417 13:05:17.001096 139061378029376 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.041996s (all_items=0.000017s, per_item={'items': '0.00001717'}, temp_paths=0.041979) I0417 13:05:17.001812 139061378029376 event_tracking.py:125] [process=5] [async] Finished blocking save in 1.17 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260417_125726/linen_xpk_main_20260417_125726_01_base/checkpoints/9. I0417 13:05:17.002171 138917936359168 async_checkpointer.py:76] [process=5][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-17 13:25:17.002134 I0417 13:05:17.004183 139061378029376 checkpoint_manager.py:1560] [process=5][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0417 13:05:17.004502 138922593179392 async_checkpointer.py:280] [process=5][thread=save_finalize] Waiting for background save thread=async_save. I0417 13:05:17.004669 139061378029376 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260417_125726/linen_xpk_main_20260417_125726_01_base/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776431086.84824, 'wait_for_prev_duration_secs': 28.977985620498657, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776431115.8280845, 'checkpointer_blocking_duration_secs': 1.1742312908172607, 'get_old_steps_start_time': 1776431117.002339, 'get_old_steps_duration_secs': 3.170967102050781e-05, 'checkpoint_manager_blocking_start_time': 1776431086.8462543, 'checkpoint_manager_blocking_duration_secs': 30.158379077911377} I0417 13:05:17.004802 139061378029376 checkpointing.py:408] Started an asynchronous checkpoint save for step 9 I0417 13:05:17.004847 139061378029376 checkpoint_manager.py:2020] [process=5][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0417 13:05:27.830414 138925456738048 array_metadata_store.py:203] [process=5][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260417_125726/linen_xpk_main_20260417_125726_01_base/checkpoints/9/items/array_metadatas/process_5 I0417 13:06:00.443569 138917936359168 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/gbytes_per_sec: 36.329 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 43.480637311935425 s) (per-host) I0417 13:06:00.443705 138917936359168 async_checkpointer.py:90] [process=5][thread=async_save] 3 Handler Commit operations completed. Time taken: 43.441418s. I0417 13:06:13.064730 138917936359168 async_checkpointer.py:160] [process=5][thread=async_save] Background save thread done. Time taken: 56.062428s. I0417 13:06:13.065002 138922593179392 async_checkpointer.py:288] [process=5][thread=save_finalize] Done with waiting for background save thread=async_save. I0417 13:06:13.065119 138922593179392 async_checkpointer.py:298] [process=5][thread=save_finalize] No errors found in background save thread=async_save. I0417 13:06:13.065171 138922593179392 checkpoint_manager.py:2137] [process=5][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0417 13:06:13.067596 138922593179392 checkpoint_manager.py:2146] [process=5][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0417 13:06:13.067780 139061378029376 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. I0417 13:06:13.067926 139061378029376 checkpoint_manager.py:2009] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0417 13:06:13.068896 139061378029376 metric_logger.py:196] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.441, Tokens/s/device: 13933.774, 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: Fri Apr 17 13:06:25 UTC 2026 EXIT_CODE=0