XPK Start: Tue Apr 21 12:14:16 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 12:14:40.512450: 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 12:14:40.693211 132799702521664 max_utils.py:273] Attempting to initialize the jax distributed system... I0421 12:14:49.733622 132799702521664 distributed.py:149] Starting JAX distributed service on [::]:8482 I0421 12:14:49.735887 132799702521664 distributed.py:172] Connecting to JAX distributed service on mt-09-pdb-lt-1-uoz2a-slice-job-0-0.mt-09-pdb-lt-1-uoz2a:8482 I0421 12:14:50.880415 132799702521664 max_utils.py:284] Jax distributed system initialized! I0421 12:14:56.872061 132799702521664 max_utils.py:800] System Information: Jax Version: 0.9.2 I0421 12:14:56.872161 132799702521664 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0421 12:14:56.872202 132799702521664 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 12:14:56.872237 132799702521664 train_utils.py:378] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0421 12:14:57.564891 132799702521664 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 8, 1, 1, 1, 1, 4, 1, 1, 1, 1) I0421 12:14:57.565483 132799702521664 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 8, 1, 1, 1, 1, 4, 1, 1, 1, 1) I0421 12:14:57.565661 132799702521664 checkpointing.py:688] Setting up checkpoint logger... I0421 12:14:57.565710 132799702521664 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0421 12:14:57.565756 132799702521664 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0421 12:14:57.566083 132799702521664 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 0x78c72272f080>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0421 12:15:00.524977 132799702521664 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0421 12:15:00.525312 132799702521664 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 0x78b2d80faf30>}, handler_registry=None I0421 12:15:00.525563 132799702521664 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x78b2d80faf30>` 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 12:15:00.525613 132799702521664 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x78b2c06bcc80>` 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 12:15:00.525650 132799702521664 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 0x78b2d80faf30>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x78b2d80faf30>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x78b2c06bcc80>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x78b2c06bcc80>}). I0421 12:15:00.525985 132799702521664 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0421 12:15:00.526056 132799702521664 async_checkpointer.py:192] [process=5][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x78b1c87ac540> timeout: 1200 secs and primary_host=0 for async checkpoint writes I0421 12:15:01.675320 132799702521664 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_09_pdb_lt_1/checkpoints I0421 12:15:02.088088 132799702521664 checkpoint_manager.py:929] [process=5][thread=MainThread] CheckpointManager created, primary_host=0, CheckpointManagerOptions=CheckpointManagerOptions(save_interval_steps=1, max_to_keep=None, keep_time_interval=None, keep_period=None, should_keep_fn=None, best_fn=None, best_mode='max', keep_checkpoints_without_metrics=True, step_prefix=None, step_format_fixed_length=None, step_name_format=None, create=True, cleanup_tmp_directories=False, save_on_steps=frozenset(), single_host_load_and_broadcast=False, todelete_subdir=None, todelete_full_path=None, enable_background_delete=False, read_only=False, enable_async_checkpointing=True, async_options=None, multiprocessing_options=MultiprocessingOptions(primary_host=0, active_processes=None, barrier_sync_key_prefix=None), should_save_fn=None, file_options=FileOptions(path_permission_mode=None), save_root_metadata=True, temporary_path_class=None, save_decision_policy=FixedIntervalPolicy(interval=10), preservation_policy=LatestN(n=None), prevent_write_metrics=False, enable_should_save_is_saving_in_progress_check=True, enable_per_process_directory_creation=False, lightweight_initialize=False), root_directory=gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_09_pdb_lt_1/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x78b2d807ecc0> I0421 12:15:02.088260 132799702521664 checkpointing.py:302] Checkpoint manager created! I0421 12:15:03.014022 132799702521664 nnx_wrappers.py:437] Unknown Logical: bfloat16[8,2048,2048]....................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0421 12:15:03.014125 132799702521664 nnx_wrappers.py:437] Unknown Physical: bfloat16[8,2048,2048]....................................... ('fsdp', None, 'tensor'). I0421 12:15:03.391871 132799702521664 attentions.py:1088] attentions/inputs_q Logical: bfloat16[8,2048,2048]....................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0421 12:15:03.391960 132799702521664 attentions.py:1088] attentions/inputs_q Physical: bfloat16[8,2048,2048]....................................... ('fsdp', None, 'tensor'). I0421 12:15:03.408245 132799702521664 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[8,2048,2048]....................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0421 12:15:03.408304 132799702521664 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[8,2048,2048]....................................... ('fsdp', None, 'tensor'). I0421 12:15:03.432029 132799702521664 attentions.py:1154] attentions/query Logical: bfloat16[8,2048,16,128]..................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0421 12:15:03.432093 132799702521664 attentions.py:1154] attentions/query Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, 'tensor', None). I0421 12:15:03.448466 132799702521664 attentions.py:1155] attentions/key Logical: bfloat16[8,2048,16,128]..................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0421 12:15:03.448525 132799702521664 attentions.py:1155] attentions/key Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, 'tensor', None). I0421 12:15:03.464870 132799702521664 attentions.py:1156] attentions/value Logical: bfloat16[8,2048,16,128]..................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0421 12:15:03.464929 132799702521664 attentions.py:1156] attentions/value Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, 'tensor', None). I0421 12:15:03.489558 132799702521664 attentions.py:1197] attentions/out Logical: bfloat16[8,2048,16,128]..................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0421 12:15:03.489632 132799702521664 attentions.py:1197] attentions/out Physical: bfloat16[8,2048,16,128]..................................... ('fsdp', None, 'tensor', None). I0421 12:15:03.510745 132799702521664 linears.py:525] linears/x Logical: bfloat16[8,2048,7168]....................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0421 12:15:03.510815 132799702521664 linears.py:525] linears/x Physical: bfloat16[8,2048,7168]....................................... ('fsdp', None, 'tensor'). I0421 12:15:03.727079 132799702521664 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0421 12:15:03.727180 132799702521664 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. fsdp: 8 tensor: 4 I0421 12:15:05.155257 132799702521664 maxtext_utils.py:1827] params/params/decoder/decoder_norm/scale Shape: float32[2048] Logical: P('norm',) Physical: ('tensor',) I0421 12:15:05.155381 132799702521664 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, 'tensor') I0421 12:15:05.155447 132799702521664 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, 'tensor') I0421 12:15:05.155508 132799702521664 maxtext_utils.py:1827] params/params/decoder/layers/mlp/wo/kernel Shape: float32[7168,16,2048] Logical: P('mlp', 'layers', 'embed') Physical: ('tensor', None, 'fsdp') I0421 12:15:05.155564 132799702521664 maxtext_utils.py:1827] params/params/decoder/layers/post_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: P('norm', 'layers') Physical: ('tensor', None) I0421 12:15:05.155603 132799702521664 maxtext_utils.py:1827] params/params/decoder/layers/pre_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: P('norm', 'layers') Physical: ('tensor', None) I0421 12:15:05.155654 132799702521664 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, 'tensor', None) I0421 12:15:05.155706 132799702521664 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: ('tensor', None, None, 'fsdp') I0421 12:15:05.155745 132799702521664 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, 'tensor', None) I0421 12:15:05.155779 132799702521664 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, 'tensor', None) I0421 12:15:05.155825 132799702521664 maxtext_utils.py:1827] params/params/decoder/logits_dense/kernel Shape: float32[2048,32000] Logical: P('embed_vocab', 'vocab') Physical: ('fsdp', 'tensor') I0421 12:15:05.155872 132799702521664 maxtext_utils.py:1827] params/params/token_embedder/embedding Shape: float32[32000,2048] Logical: P('vocab', 'embed_vocab') Physical: ('tensor', 'fsdp') I0421 12:15:05.651533 132799702521664 train.py:157] train/xent Logical: float32[8,2048]............................................. ('activation_embed_and_logits_batch', 'activation_length'). I0421 12:15:05.651632 132799702521664 train.py:157] train/xent Physical: float32[8,2048]............................................. ('fsdp', None). I0421 12:15:05.666964 132799702521664 train.py:164] train/z_loss Logical: float32[8,2048]............................................. ('activation_embed_and_logits_batch', 'activation_length'). I0421 12:15:05.667025 132799702521664 train.py:164] train/z_loss Physical: float32[8,2048]............................................. ('fsdp', None). I0421 12:15:20.647677 132799702521664 max_utils.py:791] Total memory size: 0.9 GB, Output size: 0.4 GB, Temp size: 0.5 GB, Argument size: 0.4 GB, Host temp size: 0.0 GB. I0421 12:15:20.648507 132799702521664 metric_logger.py:301] number parameters: 1.104 billion I0421 12:15:21.839258 132799702521664 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0421 12:15:36.326643 132799702521664 checkpointing.py:798] Waited 14.487364768981934 seconds for step 0 to finish before starting checkpointing. I0421 12:15:36.329270 132799702521664 checkpoint_manager.py:2009] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 12:15:36.337649 132799702521664 checkpoint_manager.py:1512] [process=5] Saving checkpoint at step 0 I0421 12:15:36.339578 132799702521664 event_tracking.py:70] [process=5] [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_09_pdb_lt_1/checkpoints/0. I0421 12:15:36.706728 132799702521664 signaling_client.py:364] Using JaxDistributedSignalingClient I0421 12:15:36.707633 132799702521664 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array. I0421 12:15:36.707693 132799702521664 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 12:15:36.979413 132799702521664 base_pytree_checkpoint_handler.py:154] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.272764s I0421 12:15:36.979598 132799702521664 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/blocking_gbytes_per_sec: 5.539 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.27851438522338867 s) (per-host) I0421 12:15:36.979651 132799702521664 base_pytree_checkpoint_handler.py:768] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.278577s (batch_requests_ready=0.002500s, total_serialization_initiated=0.276006s, others=0.000071s) I0421 12:15:36.979751 132799702521664 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.282833s (all_items=0.000017s, per_item={'items': '0.00001693'}, temp_paths=0.282816) I0421 12:15:36.980585 132799702521664 event_tracking.py:125] [process=5] [async] Finished blocking save in 0.64 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_09_pdb_lt_1/checkpoints/0. I0421 12:15:36.980931 132671418476288 async_checkpointer.py:76] [process=5][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-21 12:35:36.980893 I0421 12:15:36.995549 132799702521664 checkpoint_manager.py:1560] [process=5][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0421 12:15:36.995805 132670919005952 async_checkpointer.py:280] [process=5][thread=save_finalize] Waiting for background save thread=async_save. I0421 12:15:36.995973 132799702521664 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_09_pdb_lt_1/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776773736.329251, 'wait_for_prev_duration_secs': 6.270408630371094e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776773736.3376932, 'checkpointer_blocking_duration_secs': 0.6433863639831543, 'get_old_steps_start_time': 1776773736.9811056, 'get_old_steps_duration_secs': 3.0517578125e-05, 'checkpoint_manager_blocking_start_time': 1776773736.3271823, 'checkpoint_manager_blocking_duration_secs': 0.6687412261962891} I0421 12:15:36.996084 132799702521664 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0421 12:15:36.996136 132799702521664 max_utils.py:750] Memstats: After params initialized: I0421 12:15:36.996192 132799702521664 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_18(process=5,(2,4,0,0)) I0421 12:15:36.996225 132799702521664 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_19(process=5,(3,4,0,0)) I0421 12:15:36.996252 132799702521664 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_22(process=5,(2,5,0,0)) I0421 12:15:36.996277 132799702521664 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_23(process=5,(3,5,0,0)) I0421 12:15:37.304872 132799702521664 metric_logger.py:196] completed step: 0, seconds: 1.191, TFLOP/s/device: 2.853, Tokens/s/device: 430.020, total_weights: 16384, loss: 10.862, lm_loss: 10.862, perplexity: 52153.723 I0421 12:15:37.388875 132799702521664 metric_logger.py:196] completed step: 1, seconds: 15.464, TFLOP/s/device: 0.220, Tokens/s/device: 33.109, total_weights: 16384, loss: 10.862, lm_loss: 10.862, perplexity: 52153.723 I0421 12:15:37.822469 132799702521664 metric_logger.py:196] completed step: 2, seconds: 0.026, TFLOP/s/device: 131.221, Tokens/s/device: 19779.031, total_weights: 16384, loss: 9.763, lm_loss: 9.763, perplexity: 17373.129 I0421 12:15:37.880802 132799702521664 metric_logger.py:196] completed step: 3, seconds: 0.434, TFLOP/s/device: 7.827, Tokens/s/device: 1179.797, total_weights: 16384, loss: 8.823, lm_loss: 8.823, perplexity: 6791.817 I0421 12:15:37.998945 132799702521664 metric_logger.py:196] completed step: 4, seconds: 0.064, TFLOP/s/device: 53.451, Tokens/s/device: 8056.648, total_weights: 16384, loss: 7.947, lm_loss: 7.947, perplexity: 2828.417 I0421 12:15:38.004726 132799702521664 metric_logger.py:196] completed step: 5, seconds: 0.058, TFLOP/s/device: 58.521, Tokens/s/device: 8820.894, total_weights: 16384, loss: 7.212, lm_loss: 7.212, perplexity: 1355.339 I0421 12:15:39.884939 2513 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0421 12:15:41.930759 132670927398656 array_metadata_store.py:203] [process=5][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_09_pdb_lt_1/checkpoints/0/items/array_metadatas/process_5 I0421 12:15:51.825834 132799702521664 metric_logger.py:196] completed step: 6, seconds: 0.119, TFLOP/s/device: 28.558, Tokens/s/device: 4304.510, total_weights: 16384, loss: 6.652, lm_loss: 6.652, perplexity: 774.659 I0421 12:15:51.884265 132799702521664 metric_logger.py:196] completed step: 7, seconds: 13.764, TFLOP/s/device: 0.247, Tokens/s/device: 37.200, total_weights: 16384, loss: 6.269, lm_loss: 6.269, perplexity: 527.696 I0421 12:15:51.942561 132799702521664 metric_logger.py:196] completed step: 8, seconds: 0.063, TFLOP/s/device: 53.930, Tokens/s/device: 8128.920, total_weights: 16384, loss: 6.031, lm_loss: 6.031, perplexity: 416.165 I0421 12:15:52.000309 132799702521664 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0421 12:15:52.000936 132799702521664 checkpointing.py:798] Waited 0.0006418228149414062 seconds for step 9 to finish before starting checkpointing. I0421 12:15:52.003018 132799702521664 checkpoint_manager.py:2020] [process=5][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0421 12:16:13.771085 132671418476288 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/gbytes_per_sec: 42.611 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 37.069961071014404 s) (per-host) I0421 12:16:13.771213 132671418476288 async_checkpointer.py:90] [process=5][thread=async_save] 3 Handler Commit operations completed. Time taken: 36.790172s. I0421 12:16:20.757162 132671418476288 async_checkpointer.py:160] [process=5][thread=async_save] Background save thread done. Time taken: 43.776103s. I0421 12:16:20.757447 132670919005952 async_checkpointer.py:288] [process=5][thread=save_finalize] Done with waiting for background save thread=async_save. I0421 12:16:20.757561 132670919005952 async_checkpointer.py:298] [process=5][thread=save_finalize] No errors found in background save thread=async_save. I0421 12:16:20.757612 132670919005952 checkpoint_manager.py:2137] [process=5][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0421 12:16:20.759341 132670919005952 checkpoint_manager.py:2146] [process=5][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0421 12:16:20.759516 132799702521664 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. W0421 12:16:20.759646 132799702521664 checkpoint_manager.py:1452] Waiting for previous save to complete took 28.756629 seconds. If this number is high, consider checkpointing less frequently. I0421 12:16:20.761605 132799702521664 checkpoint_manager.py:1512] [process=5] Saving checkpoint at step 9 I0421 12:16:20.763543 132799702521664 event_tracking.py:70] [process=5] [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_09_pdb_lt_1/checkpoints/9. I0421 12:16:21.062184 132799702521664 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array. I0421 12:16:21.062286 132799702521664 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 12:16:21.088288 132799702521664 base_pytree_checkpoint_handler.py:154] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.027171s I0421 12:16:21.088439 132799702521664 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/blocking_gbytes_per_sec: 49.335 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.03126716613769531 s) (per-host) I0421 12:16:21.088489 132799702521664 base_pytree_checkpoint_handler.py:768] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.031338s (batch_requests_ready=0.002275s, total_serialization_initiated=0.028984s, others=0.000079s) I0421 12:16:21.088579 132799702521664 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.035885s (all_items=0.000030s, per_item={'items': '0.00002980'}, temp_paths=0.035855) I0421 12:16:21.089246 132799702521664 event_tracking.py:125] [process=5] [async] Finished blocking save in 0.33 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_09_pdb_lt_1/checkpoints/9. I0421 12:16:21.089542 132670919005952 async_checkpointer.py:76] [process=5][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-21 12:36:21.089509 I0421 12:16:21.091778 132799702521664 checkpoint_manager.py:1560] [process=5][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0421 12:16:21.092074 132670927398656 async_checkpointer.py:280] [process=5][thread=save_finalize] Waiting for background save thread=async_save. I0421 12:16:21.092244 132799702521664 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_09_pdb_lt_1/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776773752.0029876, 'wait_for_prev_duration_secs': 28.75662922859192, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776773780.7616422, 'checkpointer_blocking_duration_secs': 0.3280453681945801, 'get_old_steps_start_time': 1776773781.089715, 'get_old_steps_duration_secs': 3.600120544433594e-05, 'checkpoint_manager_blocking_start_time': 1776773752.001155, 'checkpoint_manager_blocking_duration_secs': 29.091048002243042} I0421 12:16:21.092373 132799702521664 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0421 12:16:21.092442 132799702521664 checkpoint_manager.py:2020] [process=5][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0421 12:16:27.050033 132671418476288 array_metadata_store.py:203] [process=5][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260421_114057/linen_xpk_feat_nnx_post_train_fixes_20260421_114057_09_pdb_lt_1/checkpoints/9/items/array_metadatas/process_5 I0421 12:17:03.367057 132670919005952 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/gbytes_per_sec: 37.334 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.30984807014465 s) (per-host) I0421 12:17:03.367197 132670919005952 async_checkpointer.py:90] [process=5][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.277540s. I0421 12:17:10.056005 132670919005952 async_checkpointer.py:160] [process=5][thread=async_save] Background save thread done. Time taken: 48.966333s. I0421 12:17:10.056274 132670927398656 async_checkpointer.py:288] [process=5][thread=save_finalize] Done with waiting for background save thread=async_save. I0421 12:17:10.056396 132670927398656 async_checkpointer.py:298] [process=5][thread=save_finalize] No errors found in background save thread=async_save. I0421 12:17:10.056468 132670927398656 checkpoint_manager.py:2137] [process=5][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0421 12:17:10.058885 132670927398656 checkpoint_manager.py:2146] [process=5][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0421 12:17:10.059058 132799702521664 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. I0421 12:17:10.059205 132799702521664 checkpoint_manager.py:2009] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0421 12:17:10.060158 132799702521664 metric_logger.py:196] completed step: 9, seconds: 0.058, TFLOP/s/device: 58.273, Tokens/s/device: 8783.517, total_weights: 16384, loss: 5.892, lm_loss: 5.892, perplexity: 361.955 Per train step: Total TFLOPs: 3.40 split as 93.93% learnable weight flops and 6.07% attention flops XPK End: Tue Apr 21 12:17:22 UTC 2026 EXIT_CODE=0