main (574ad3fb9) vs feat/nnx-post-train-fixes (574ad3fb9)| Metric | main 574ad3fb9 | feat/nnx-post-train-fixes 574ad3fb9 | Diff (feat/nnx-post-train-fixes − main) |
|---|---|---|---|
| Parameters | 1.104 billion | 1.104 billion | — |
| Final loss | 8.1790 | 8.1790 | 0 |
| TFLOP/s | 91.796 | 92.092 | +0.296 |
| Tok/s | 13836.4 | 13881.1 | +44.641 |
| Avg s/step | 3.081 | 2.949 | -0.132 |
| Memory % | 1.38 | 1.38 | 0 |
| JAX | 0.9.2 | 0.9.2 | — |
Diff = branch value − main value. Green = branch improved. Red = branch regressed.
XPK Start: Sat Apr 18 18:05:37 UTC 2026 PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used. 2026-04-18 18:06:01.657639: 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) I0418 18:06:02.191496 139213532985152 max_utils.py:273] Attempting to initialize the jax distributed system... I0418 18:06:11.232153 139213532985152 distributed.py:149] Starting JAX distributed service on [::]:8482 I0418 18:06:11.234575 139213532985152 distributed.py:172] Connecting to JAX distributed service on mt-02-synthetic-1t9y5-slice-job-0-0.mt-02-synthetic-1t9y5:8482 I0418 18:06:12.509524 139213532985152 max_utils.py:284] Jax distributed system initialized! I0418 18:06:18.514478 139213532985152 max_utils.py:800] System Information: Jax Version: 0.9.2 I0418 18:06:18.514583 139213532985152 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0418 18:06:18.514624 139213532985152 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 I0418 18:06:18.514659 139213532985152 train_utils.py:348] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0418 18:06:19.215611 139213532985152 maxtext_utils.py:1551] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0418 18:06:19.215882 139213532985152 checkpointing.py:677] Setting up checkpoint logger... I0418 18:06:19.215936 139213532985152 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True I0418 18:06:19.215980 139213532985152 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0418 18:06:19.216330 139213532985152 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 0x7e9c75b3c170>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0418 18:06:23.367615 139213532985152 checkpointing.py:265] Enabling policy for fixed interval checkpointing. I0418 18:06:23.367856 139213532985152 checkpoint_manager.py:708] [process=7][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7e9b69fd6630>}, handler_registry=None I0418 18:06:23.368108 139213532985152 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7e9b69fd6630>` 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`. I0418 18:06:23.368158 139213532985152 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e881448d580>` 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`. I0418 18:06:23.368190 139213532985152 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 0x7e9b69fd6630>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7e9b69fd6630>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e881448d580>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7e881448d580>}). I0418 18:06:23.368507 139213532985152 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0418 18:06:23.368576 139213532985152 async_checkpointer.py:192] [process=7][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7e87307cb880> timeout: 1200 secs and primary_host=0 for async checkpoint writes I0418 18:06:25.040515 139213532985152 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_02_synthetic/checkpoints I0418 18:06:25.042809 139213532985152 checkpoint_manager.py:929] [process=7][thread=MainThread] CheckpointManager created, primary_host=0, CheckpointManagerOptions=CheckpointManagerOptions(save_interval_steps=1, max_to_keep=None, keep_time_interval=None, keep_period=None, should_keep_fn=None, best_fn=None, best_mode='max', keep_checkpoints_without_metrics=True, step_prefix=None, step_format_fixed_length=None, step_name_format=None, create=True, cleanup_tmp_directories=False, save_on_steps=frozenset(), single_host_load_and_broadcast=False, todelete_subdir=None, todelete_full_path=None, enable_background_delete=False, read_only=False, enable_async_checkpointing=True, async_options=None, multiprocessing_options=MultiprocessingOptions(primary_host=0, active_processes=None, barrier_sync_key_prefix=None), should_save_fn=None, file_options=FileOptions(path_permission_mode=None), save_root_metadata=True, temporary_path_class=None, save_decision_policy=FixedIntervalPolicy(interval=10), preservation_policy=LatestN(n=None), prevent_write_metrics=False, enable_should_save_is_saving_in_progress_check=True, enable_per_process_directory_creation=False, lightweight_initialize=False), root_directory=gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_02_synthetic/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7e881448ab40> I0418 18:06:25.042919 139213532985152 checkpointing.py:301] Checkpoint manager created! I0418 18:06:25.968616 139213532985152 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0418 18:06:25.968731 139213532985152 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0418 18:06:26.349723 139213532985152 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0418 18:06:26.349818 139213532985152 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0418 18:06:26.366260 139213532985152 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0418 18:06:26.366317 139213532985152 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0418 18:06:26.390088 139213532985152 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0418 18:06:26.390157 139213532985152 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0418 18:06:26.406702 139213532985152 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0418 18:06:26.406764 139213532985152 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0418 18:06:26.423184 139213532985152 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0418 18:06:26.423245 139213532985152 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0418 18:06:26.448630 139213532985152 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0418 18:06:26.448699 139213532985152 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0418 18:06:26.469554 139213532985152 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0418 18:06:26.469618 139213532985152 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0418 18:06:26.684895 139213532985152 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint I0418 18:06:26.685003 139213532985152 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0418 18:06:28.112239 139213532985152 maxtext_utils.py:1654] params/params/decoder/decoder_norm/scale Shape: float32[2048] Logical: P('norm',) Physical: (None,) I0418 18:06:28.112364 139213532985152 maxtext_utils.py:1654] params/params/decoder/layers/mlp/wi_0/kernel Shape: float32[2048,16,7168] Logical: P('embed', 'layers', 'mlp') Physical: ('fsdp', None, None) I0418 18:06:28.112416 139213532985152 maxtext_utils.py:1654] params/params/decoder/layers/mlp/wi_1/kernel Shape: float32[2048,16,7168] Logical: P('embed', 'layers', 'mlp') Physical: ('fsdp', None, None) I0418 18:06:28.112474 139213532985152 maxtext_utils.py:1654] params/params/decoder/layers/mlp/wo/kernel Shape: float32[7168,16,2048] Logical: P('mlp', 'layers', 'embed') Physical: (None, None, 'fsdp') I0418 18:06:28.112533 139213532985152 maxtext_utils.py:1654] params/params/decoder/layers/post_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: P('norm', 'layers') Physical: (None, None) I0418 18:06:28.112574 139213532985152 maxtext_utils.py:1654] params/params/decoder/layers/pre_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: P('norm', 'layers') Physical: (None, None) I0418 18:06:28.112627 139213532985152 maxtext_utils.py:1654] 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) I0418 18:06:28.112680 139213532985152 maxtext_utils.py:1654] 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') I0418 18:06:28.112719 139213532985152 maxtext_utils.py:1654] 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) I0418 18:06:28.112757 139213532985152 maxtext_utils.py:1654] 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) I0418 18:06:28.112804 139213532985152 maxtext_utils.py:1654] params/params/decoder/logits_dense/kernel Shape: float32[2048,32000] Logical: P('embed_vocab', 'vocab') Physical: ('fsdp', None) I0418 18:06:28.112853 139213532985152 maxtext_utils.py:1654] params/params/token_embedder/embedding Shape: float32[32000,2048] Logical: P('vocab', 'embed_vocab') Physical: (None, 'fsdp') I0418 18:06:28.605794 139213532985152 train.py:155] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0418 18:06:28.605895 139213532985152 train.py:155] train/xent Physical: float32[32,2048]............................................ ('fsdp', None). I0418 18:06:28.621365 139213532985152 train.py:162] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0418 18:06:28.621431 139213532985152 train.py:162] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None). I0418 18:06:39.413702 139213532985152 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. I0418 18:06:39.414582 139213532985152 metric_logger.py:301] number parameters: 1.104 billion I0418 18:06:50.894916 139213532985152 checkpointing.py:772] Waiting for step 0 to finish before checkpoint... I0418 18:06:51.047773 139213532985152 checkpointing.py:776] Waited 0.15283632278442383 seconds for step 0 to finish before starting checkpointing. I0418 18:06:51.050359 139213532985152 checkpoint_manager.py:2009] [process=7][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0418 18:06:51.052017 139213532985152 checkpoint_manager.py:1512] [process=7] Saving checkpoint at step 0 I0418 18:06:51.053503 139213532985152 event_tracking.py:70] [process=7] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_02_synthetic/checkpoints/0. I0418 18:06:51.815512 139213532985152 signaling_client.py:364] Using JaxDistributedSignalingClient I0418 18:06:51.816776 139213532985152 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array. I0418 18:06:51.816832 139213532985152 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 I0418 18:06:52.093092 139213532985152 base_pytree_checkpoint_handler.py:154] [process=7][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.277638s I0418 18:06:52.093270 139213532985152 base_pytree_checkpoint_handler.py:130] [process=7] /jax/orbax/write/blocking_gbytes_per_sec: 5.450 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2830619812011719 s) (per-host) I0418 18:06:52.093325 139213532985152 base_pytree_checkpoint_handler.py:768] [process=7][thread=MainThread] Initiated Pytree async_save. Time taken: 0.283127s (batch_requests_ready=0.002185s, total_serialization_initiated=0.280868s, others=0.000074s) I0418 18:06:52.093415 139213532985152 composite_checkpoint_handler.py:715] [process=7][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.287293s (all_items=0.000018s, per_item={'items': '0.00001764'}, temp_paths=0.287276) I0418 18:06:52.094237 139213532985152 event_tracking.py:125] [process=7] [async] Finished blocking save in 1.04 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_02_synthetic/checkpoints/0. I0418 18:06:52.094519 139083852723968 async_checkpointer.py:76] [process=7][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-18 18:26:52.094495 I0418 18:06:52.100398 139213532985152 checkpoint_manager.py:1560] [process=7][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0418 18:06:52.100628 139082776700672 async_checkpointer.py:280] [process=7][thread=save_finalize] Waiting for background save thread=async_save. I0418 18:06:52.100745 139213532985152 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_02_synthetic/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776535611.05034, 'wait_for_prev_duration_secs': 6.198883056640625e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776535611.0520616, 'checkpointer_blocking_duration_secs': 1.042572259902954, 'get_old_steps_start_time': 1776535612.0946612, 'get_old_steps_duration_secs': 2.9802322387695312e-05, 'checkpoint_manager_blocking_start_time': 1776535611.048341, 'checkpoint_manager_blocking_duration_secs': 1.0523667335510254} I0418 18:06:52.100853 139213532985152 checkpointing.py:408] Started an asynchronous checkpoint save for step 0 I0418 18:06:52.100902 139213532985152 max_utils.py:750] Memstats: After params initialized: I0418 18:06:52.100948 139213532985152 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_26(process=7,(2,6,0,0)) I0418 18:06:52.100981 139213532985152 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_27(process=7,(3,6,0,0)) I0418 18:06:52.101009 139213532985152 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_30(process=7,(2,7,0,0)) I0418 18:06:52.101032 139213532985152 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_31(process=7,(3,7,0,0)) I0418 18:06:52.413053 139213532985152 metric_logger.py:196] completed step: 0, seconds: 11.480, TFLOP/s/device: 1.184, Tokens/s/device: 178.394, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875 I0418 18:06:52.599794 139213532985152 metric_logger.py:196] completed step: 1, seconds: 1.517, TFLOP/s/device: 8.959, Tokens/s/device: 1350.353, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875 I0418 18:06:53.016669 139213532985152 metric_logger.py:196] completed step: 2, seconds: 0.040, TFLOP/s/device: 341.445, Tokens/s/device: 51466.338, total_weights: 65536, loss: 10.262, lm_loss: 10.262, perplexity: 28637.129 I0418 18:06:53.164270 139213532985152 metric_logger.py:196] completed step: 3, seconds: 0.417, TFLOP/s/device: 32.594, Tokens/s/device: 4912.944, total_weights: 65536, loss: 9.734, lm_loss: 9.734, perplexity: 16889.203 I0418 18:06:53.459233 139213532985152 metric_logger.py:196] completed step: 4, seconds: 0.153, TFLOP/s/device: 88.918, Tokens/s/device: 13402.615, total_weights: 65536, loss: 9.277, lm_loss: 9.277, perplexity: 10694.614 I0418 18:06:53.465097 139213532985152 metric_logger.py:196] completed step: 5, seconds: 0.148, TFLOP/s/device: 92.064, Tokens/s/device: 13876.843, total_weights: 65536, loss: 8.892, lm_loss: 8.892, perplexity: 7270.717 I0418 18:06:57.601235 2858 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0418 18:07:01.081295 139082785093376 array_metadata_store.py:203] [process=7][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_02_synthetic/checkpoints/0/items/array_metadatas/process_7 I0418 18:07:18.472151 139213532985152 metric_logger.py:196] completed step: 6, seconds: 0.296, TFLOP/s/device: 45.973, Tokens/s/device: 6929.547, total_weights: 65536, loss: 8.592, lm_loss: 8.592, perplexity: 5390.759 I0418 18:07:18.619755 139213532985152 metric_logger.py:196] completed step: 7, seconds: 24.860, TFLOP/s/device: 0.547, Tokens/s/device: 82.382, total_weights: 65536, loss: 8.384, lm_loss: 8.384, perplexity: 4376.905 I0418 18:07:18.767367 139213532985152 metric_logger.py:196] completed step: 8, seconds: 0.153, TFLOP/s/device: 88.936, Tokens/s/device: 13405.335, total_weights: 65536, loss: 8.255, lm_loss: 8.255, perplexity: 3846.406 I0418 18:07:18.914693 139213532985152 checkpointing.py:772] Waiting for step 9 to finish before checkpoint... I0418 18:07:18.915394 139213532985152 checkpointing.py:776] Waited 0.0007214546203613281 seconds for step 9 to finish before starting checkpointing. I0418 18:07:18.917498 139213532985152 checkpoint_manager.py:2020] [process=7][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0418 18:07:31.226597 139083852723968 base_pytree_checkpoint_handler.py:130] [process=7] /jax/orbax/write/gbytes_per_sec: 40.075 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 39.4163293838501 s) (per-host) I0418 18:07:31.226727 139083852723968 async_checkpointer.py:90] [process=7][thread=async_save] 3 Handler Commit operations completed. Time taken: 39.132128s. I0418 18:07:40.136698 139083852723968 async_checkpointer.py:160] [process=7][thread=async_save] Background save thread done. Time taken: 48.042082s. I0418 18:07:40.136959 139082776700672 async_checkpointer.py:288] [process=7][thread=save_finalize] Done with waiting for background save thread=async_save. I0418 18:07:40.137097 139082776700672 async_checkpointer.py:298] [process=7][thread=save_finalize] No errors found in background save thread=async_save. I0418 18:07:40.137150 139082776700672 checkpoint_manager.py:2137] [process=7][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0418 18:07:40.138911 139082776700672 checkpoint_manager.py:2146] [process=7][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0418 18:07:40.139150 139213532985152 checkpoint_manager.py:2032] [process=7][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0. W0418 18:07:40.139292 139213532985152 checkpoint_manager.py:1452] Waiting for previous save to complete took 21.221793 seconds. If this number is high, consider checkpointing less frequently. I0418 18:07:40.140958 139213532985152 checkpoint_manager.py:1512] [process=7] Saving checkpoint at step 9 I0418 18:07:40.142998 139213532985152 event_tracking.py:70] [process=7] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_02_synthetic/checkpoints/9. I0418 18:07:40.861851 139213532985152 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array. I0418 18:07:40.861947 139213532985152 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 I0418 18:07:40.902238 139213532985152 base_pytree_checkpoint_handler.py:154] [process=7][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.041449s I0418 18:07:40.902404 139213532985152 base_pytree_checkpoint_handler.py:130] [process=7] /jax/orbax/write/blocking_gbytes_per_sec: 34.410 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.0448298454284668 s) (per-host) I0418 18:07:40.902456 139213532985152 base_pytree_checkpoint_handler.py:768] [process=7][thread=MainThread] Initiated Pytree async_save. Time taken: 0.044891s (batch_requests_ready=0.001755s, total_serialization_initiated=0.043068s, others=0.000067s) I0418 18:07:40.902544 139213532985152 composite_checkpoint_handler.py:715] [process=7][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.049036s (all_items=0.000016s, per_item={'items': '0.00001574'}, temp_paths=0.049020) I0418 18:07:40.903293 139213532985152 event_tracking.py:125] [process=7] [async] Finished blocking save in 0.76 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_02_synthetic/checkpoints/9. I0418 18:07:40.903562 139082776700672 async_checkpointer.py:76] [process=7][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-18 18:27:40.903538 I0418 18:07:40.905514 139213532985152 checkpoint_manager.py:1560] [process=7][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0418 18:07:40.905796 139062425929472 async_checkpointer.py:280] [process=7][thread=save_finalize] Waiting for background save thread=async_save. I0418 18:07:40.905934 139213532985152 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_02_synthetic/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776535638.9174688, 'wait_for_prev_duration_secs': 21.221792936325073, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776535660.1409976, 'checkpointer_blocking_duration_secs': 0.7626664638519287, 'get_old_steps_start_time': 1776535660.9036894, 'get_old_steps_duration_secs': 3.123283386230469e-05, 'checkpoint_manager_blocking_start_time': 1776535638.9156184, 'checkpoint_manager_blocking_duration_secs': 21.99028182029724} I0418 18:07:40.906121 139213532985152 checkpointing.py:408] Started an asynchronous checkpoint save for step 9 I0418 18:07:40.906168 139213532985152 checkpoint_manager.py:2020] [process=7][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0418 18:07:49.572019 139082785093376 array_metadata_store.py:203] [process=7][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260418_180002/linen_xpk_main_20260418_180002_02_synthetic/checkpoints/9/items/array_metadatas/process_7 I0418 18:08:23.994221 139082776700672 base_pytree_checkpoint_handler.py:130] [process=7] /jax/orbax/write/gbytes_per_sec: 36.618 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 43.13660931587219 s) (per-host) I0418 18:08:23.994349 139082776700672 async_checkpointer.py:90] [process=7][thread=async_save] 3 Handler Commit operations completed. Time taken: 43.090707s. I0418 18:08:34.151354 139082776700672 async_checkpointer.py:160] [process=7][thread=async_save] Background save thread done. Time taken: 53.247697s. I0418 18:08:34.151639 139062425929472 async_checkpointer.py:288] [process=7][thread=save_finalize] Done with waiting for background save thread=async_save. I0418 18:08:34.151765 139062425929472 async_checkpointer.py:298] [process=7][thread=save_finalize] No errors found in background save thread=async_save. I0418 18:08:34.151825 139062425929472 checkpoint_manager.py:2137] [process=7][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0418 18:08:34.153744 139062425929472 checkpoint_manager.py:2146] [process=7][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0418 18:08:34.153940 139213532985152 checkpoint_manager.py:2032] [process=7][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9. I0418 18:08:34.154109 139213532985152 checkpoint_manager.py:2009] [process=7][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0418 18:08:34.155037 139213532985152 metric_logger.py:196] completed step: 9, seconds: 0.148, TFLOP/s/device: 91.796, Tokens/s/device: 13836.435, 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: Sat Apr 18 18:08:43 UTC 2026 EXIT_CODE=0
XPK Start: Sat Apr 18 23:52:23 UTC 2026 PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used. 2026-04-18 23:52:48.631900: 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) I0418 23:52:48.813883 138105240442688 max_utils.py:273] Attempting to initialize the jax distributed system... I0418 23:52:57.855117 138105240442688 distributed.py:149] Starting JAX distributed service on [::]:8482 I0418 23:52:57.857532 138105240442688 distributed.py:172] Connecting to JAX distributed service on mt-02-synthetic-b9n91-slice-job-0-0.mt-02-synthetic-b9n91:8482 I0418 23:53:00.394344 138105240442688 max_utils.py:284] Jax distributed system initialized! I0418 23:53:06.582359 138105240442688 max_utils.py:800] System Information: Jax Version: 0.9.2 I0418 23:53:06.582457 138105240442688 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0418 23:53:06.582497 138105240442688 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 I0418 23:53:06.582532 138105240442688 train_utils.py:378] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0418 23:53:07.281762 138105240442688 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0418 23:53:07.282361 138105240442688 maxtext_utils.py:1718] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0418 23:53:07.282537 138105240442688 checkpointing.py:688] Setting up checkpoint logger... I0418 23:53:07.282587 138105240442688 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0418 23:53:07.282628 138105240442688 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0418 23:53:07.282959 138105240442688 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 0x7d9a80d1cd10>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0418 23:53:11.323406 138105240442688 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0418 23:53:11.323634 138105240442688 checkpoint_manager.py:708] [process=1][thread=MainThread] CheckpointManager init: checkpointers=None, item_names=('items',), item_handlers={'items': <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7d86203bde80>}, handler_registry=None I0418 23:53:11.323875 138105240442688 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7d86203bde80>` 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`. I0418 23:53:11.323923 138105240442688 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d8620594500>` 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`. I0418 23:53:11.323958 138105240442688 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 0x7d86203bde80>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7d86203bde80>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d8620594500>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7d8620594500>}). I0418 23:53:11.324286 138105240442688 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0418 23:53:11.324355 138105240442688 async_checkpointer.py:192] [process=1][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7d853831f740> timeout: 1200 secs and primary_host=0 for async checkpoint writes I0418 23:53:12.444922 138105240442688 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260418_235007/linen_xpk_feat_nnx_post_train_fixes_20260418_235007_02_synthetic/checkpoints I0418 23:53:13.302140 138105240442688 checkpoint_manager.py:929] [process=1][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_20260418_235007/linen_xpk_feat_nnx_post_train_fixes_20260418_235007_02_synthetic/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7d86203bdb20> I0418 23:53:13.302356 138105240442688 checkpointing.py:302] Checkpoint manager created! I0418 23:53:14.236592 138105240442688 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0418 23:53:14.236696 138105240442688 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0418 23:53:14.611898 138105240442688 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0418 23:53:14.611989 138105240442688 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0418 23:53:14.628343 138105240442688 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0418 23:53:14.628401 138105240442688 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0418 23:53:14.652117 138105240442688 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0418 23:53:14.652194 138105240442688 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0418 23:53:14.668563 138105240442688 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0418 23:53:14.668622 138105240442688 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0418 23:53:14.684874 138105240442688 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0418 23:53:14.684933 138105240442688 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0418 23:53:14.709547 138105240442688 attentions.py:1197] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0418 23:53:14.709614 138105240442688 attentions.py:1197] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0418 23:53:14.730616 138105240442688 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0418 23:53:14.730682 138105240442688 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0418 23:53:14.944458 138105240442688 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0418 23:53:14.944565 138105240442688 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0418 23:53:16.367152 138105240442688 maxtext_utils.py:1827] params/params/decoder/decoder_norm/scale Shape: float32[2048] Logical: P('norm',) Physical: (None,) I0418 23:53:16.367291 138105240442688 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) I0418 23:53:16.367344 138105240442688 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) I0418 23:53:16.367619 138105240442688 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') I0418 23:53:16.367807 138105240442688 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) I0418 23:53:16.367863 138105240442688 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) I0418 23:53:16.367941 138105240442688 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) I0418 23:53:16.368006 138105240442688 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') I0418 23:53:16.368055 138105240442688 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) I0418 23:53:16.368094 138105240442688 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) I0418 23:53:16.368149 138105240442688 maxtext_utils.py:1827] params/params/decoder/logits_dense/kernel Shape: float32[2048,32000] Logical: P('embed_vocab', 'vocab') Physical: ('fsdp', None) I0418 23:53:16.368229 138105240442688 maxtext_utils.py:1827] params/params/token_embedder/embedding Shape: float32[32000,2048] Logical: P('vocab', 'embed_vocab') Physical: (None, 'fsdp') I0418 23:53:16.863657 138105240442688 train.py:157] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0418 23:53:16.863755 138105240442688 train.py:157] train/xent Physical: float32[32,2048]............................................ ('fsdp', None). I0418 23:53:16.879391 138105240442688 train.py:164] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0418 23:53:16.879450 138105240442688 train.py:164] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None). I0418 23:53:27.666803 138105240442688 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. I0418 23:53:27.667606 138105240442688 metric_logger.py:301] number parameters: 1.104 billion I0418 23:53:39.204205 138105240442688 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0418 23:53:39.358393 138105240442688 checkpointing.py:798] Waited 0.1541905403137207 seconds for step 0 to finish before starting checkpointing. I0418 23:53:39.360827 138105240442688 checkpoint_manager.py:2009] [process=1][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0418 23:53:39.362683 138105240442688 checkpoint_manager.py:1512] [process=1] Saving checkpoint at step 0 I0418 23:53:39.364042 138105240442688 event_tracking.py:70] [process=1] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260418_235007/linen_xpk_feat_nnx_post_train_fixes_20260418_235007_02_synthetic/checkpoints/0. I0418 23:53:40.095131 138105240442688 signaling_client.py:364] Using JaxDistributedSignalingClient I0418 23:53:40.096168 138105240442688 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array. I0418 23:53:40.096244 138105240442688 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 I0418 23:53:40.370796 138105240442688 base_pytree_checkpoint_handler.py:154] [process=1][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.275742s I0418 23:53:40.370973 138105240442688 base_pytree_checkpoint_handler.py:130] [process=1] /jax/orbax/write/blocking_gbytes_per_sec: 5.488 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2810819149017334 s) (per-host) I0418 23:53:40.371027 138105240442688 base_pytree_checkpoint_handler.py:768] [process=1][thread=MainThread] Initiated Pytree async_save. Time taken: 0.281147s (batch_requests_ready=0.002165s, total_serialization_initiated=0.278908s, others=0.000074s) I0418 23:53:40.371119 138105240442688 composite_checkpoint_handler.py:715] [process=1][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.285445s (all_items=0.000017s, per_item={'items': '0.00001740'}, temp_paths=0.285428) I0418 23:53:40.371981 138105240442688 event_tracking.py:125] [process=1] [async] Finished blocking save in 1.01 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260418_235007/linen_xpk_feat_nnx_post_train_fixes_20260418_235007_02_synthetic/checkpoints/0. I0418 23:53:40.372328 137975351564032 async_checkpointer.py:76] [process=1][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-19 00:13:40.372290 I0418 23:53:40.386376 138105240442688 checkpoint_manager.py:1560] [process=1][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0418 23:53:40.386680 137972661872384 async_checkpointer.py:280] [process=1][thread=save_finalize] Waiting for background save thread=async_save. I0418 23:53:40.386839 138105240442688 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260418_235007/linen_xpk_feat_nnx_post_train_fixes_20260418_235007_02_synthetic/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776556419.3608103, 'wait_for_prev_duration_secs': 5.9604644775390625e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776556419.3627212, 'checkpointer_blocking_duration_secs': 1.0097613334655762, 'get_old_steps_start_time': 1776556420.3725073, 'get_old_steps_duration_secs': 3.123283386230469e-05, 'checkpoint_manager_blocking_start_time': 1776556419.358902, 'checkpoint_manager_blocking_duration_secs': 1.0278980731964111} I0418 23:53:40.386942 138105240442688 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0418 23:53:40.386998 138105240442688 max_utils.py:750] Memstats: After params initialized: I0418 23:53:40.387048 138105240442688 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_2(process=1,(2,0,0,0)) I0418 23:53:40.387081 138105240442688 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_3(process=1,(3,0,0,0)) I0418 23:53:40.387108 138105240442688 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_6(process=1,(2,1,0,0)) I0418 23:53:40.387132 138105240442688 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_7(process=1,(3,1,0,0)) I0418 23:53:40.693113 138105240442688 metric_logger.py:196] completed step: 0, seconds: 11.536, TFLOP/s/device: 1.178, Tokens/s/device: 177.524, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875 I0418 23:53:40.887562 138105240442688 metric_logger.py:196] completed step: 1, seconds: 1.487, TFLOP/s/device: 9.135, Tokens/s/device: 1376.914, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875 I0418 23:53:41.287415 138105240442688 metric_logger.py:196] completed step: 2, seconds: 0.047, TFLOP/s/device: 288.860, Tokens/s/device: 43540.192, total_weights: 65536, loss: 10.262, lm_loss: 10.262, perplexity: 28637.129 I0418 23:53:41.434641 138105240442688 metric_logger.py:196] completed step: 3, seconds: 0.400, TFLOP/s/device: 33.976, Tokens/s/device: 5121.191, total_weights: 65536, loss: 9.734, lm_loss: 9.734, perplexity: 16889.203 I0418 23:53:41.730195 138105240442688 metric_logger.py:196] completed step: 4, seconds: 0.153, TFLOP/s/device: 88.592, Tokens/s/device: 13353.590, total_weights: 65536, loss: 9.277, lm_loss: 9.277, perplexity: 10694.614 I0418 23:53:41.735899 138105240442688 metric_logger.py:196] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.213, Tokens/s/device: 13899.352, total_weights: 65536, loss: 8.892, lm_loss: 8.892, perplexity: 7270.717 I0418 23:53:46.471561 2818 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0418 23:53:49.286918 137972670265088 array_metadata_store.py:203] [process=1][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260418_235007/linen_xpk_feat_nnx_post_train_fixes_20260418_235007_02_synthetic/checkpoints/0/items/array_metadatas/process_1 I0418 23:54:05.590207 138105240442688 metric_logger.py:196] completed step: 6, seconds: 0.296, TFLOP/s/device: 45.950, Tokens/s/device: 6926.102, total_weights: 65536, loss: 8.592, lm_loss: 8.592, perplexity: 5390.759 I0418 23:54:05.737780 138105240442688 metric_logger.py:196] completed step: 7, seconds: 23.708, TFLOP/s/device: 0.573, Tokens/s/device: 86.386, total_weights: 65536, loss: 8.384, lm_loss: 8.384, perplexity: 4376.905 I0418 23:54:05.885210 138105240442688 metric_logger.py:196] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.204, Tokens/s/device: 13445.820, total_weights: 65536, loss: 8.255, lm_loss: 8.255, perplexity: 3846.406 I0418 23:54:06.031965 138105240442688 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0418 23:54:06.032607 138105240442688 checkpointing.py:798] Waited 0.0006625652313232422 seconds for step 9 to finish before starting checkpointing. I0418 23:54:06.034972 138105240442688 checkpoint_manager.py:2020] [process=1][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0418 23:54:20.418786 137975351564032 base_pytree_checkpoint_handler.py:130] [process=1] /jax/orbax/write/gbytes_per_sec: 39.168 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 40.32885432243347 s) (per-host) I0418 23:54:20.418907 137975351564032 async_checkpointer.py:90] [process=1][thread=async_save] 3 Handler Commit operations completed. Time taken: 40.046466s. I0418 23:54:31.623595 137975351564032 async_checkpointer.py:160] [process=1][thread=async_save] Background save thread done. Time taken: 51.251136s. I0418 23:54:31.623866 137972661872384 async_checkpointer.py:288] [process=1][thread=save_finalize] Done with waiting for background save thread=async_save. I0418 23:54:31.624007 137972661872384 async_checkpointer.py:298] [process=1][thread=save_finalize] No errors found in background save thread=async_save. I0418 23:54:31.624063 137972661872384 checkpoint_manager.py:2137] [process=1][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0418 23:54:31.625836 137972661872384 checkpoint_manager.py:2146] [process=1][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0418 23:54:31.626003 138105240442688 checkpoint_manager.py:2032] [process=1][thread=MainThread][step=0][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=0. W0418 23:54:31.626131 138105240442688 checkpoint_manager.py:1452] Waiting for previous save to complete took 25.591158 seconds. If this number is high, consider checkpointing less frequently. I0418 23:54:31.628081 138105240442688 checkpoint_manager.py:1512] [process=1] Saving checkpoint at step 9 I0418 23:54:31.630129 138105240442688 event_tracking.py:70] [process=1] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260418_235007/linen_xpk_feat_nnx_post_train_fixes_20260418_235007_02_synthetic/checkpoints/9. I0418 23:54:32.768154 138105240442688 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array. I0418 23:54:32.768262 138105240442688 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 I0418 23:54:32.810192 138105240442688 base_pytree_checkpoint_handler.py:154] [process=1][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.043166s I0418 23:54:32.810362 138105240442688 base_pytree_checkpoint_handler.py:130] [process=1] /jax/orbax/write/blocking_gbytes_per_sec: 33.136 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.04655265808105469 s) (per-host) I0418 23:54:32.810414 138105240442688 base_pytree_checkpoint_handler.py:768] [process=1][thread=MainThread] Initiated Pytree async_save. Time taken: 0.046614s (batch_requests_ready=0.001768s, total_serialization_initiated=0.044776s, others=0.000070s) I0418 23:54:32.810501 138105240442688 composite_checkpoint_handler.py:715] [process=1][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.050678s (all_items=0.000015s, per_item={'items': '0.00001550'}, temp_paths=0.050663) I0418 23:54:32.811170 138105240442688 event_tracking.py:125] [process=1] [async] Finished blocking save in 1.18 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260418_235007/linen_xpk_feat_nnx_post_train_fixes_20260418_235007_02_synthetic/checkpoints/9. I0418 23:54:32.811528 137972661872384 async_checkpointer.py:76] [process=1][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-19 00:14:32.811491 I0418 23:54:32.813667 138105240442688 checkpoint_manager.py:1560] [process=1][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0418 23:54:32.813971 137975312025344 async_checkpointer.py:280] [process=1][thread=save_finalize] Waiting for background save thread=async_save. I0418 23:54:32.814132 138105240442688 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260418_235007/linen_xpk_feat_nnx_post_train_fixes_20260418_235007_02_synthetic/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776556446.034944, 'wait_for_prev_duration_secs': 25.591157913208008, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776556471.6281226, 'checkpointer_blocking_duration_secs': 1.183556318283081, 'get_old_steps_start_time': 1776556472.8117023, 'get_old_steps_duration_secs': 2.9087066650390625e-05, 'checkpoint_manager_blocking_start_time': 1776556446.0328662, 'checkpoint_manager_blocking_duration_secs': 26.781230211257935} I0418 23:54:32.814262 138105240442688 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0418 23:54:32.814309 138105240442688 checkpoint_manager.py:2020] [process=1][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0418 23:54:40.973543 137972670265088 array_metadata_store.py:203] [process=1][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260418_235007/linen_xpk_feat_nnx_post_train_fixes_20260418_235007_02_synthetic/checkpoints/9/items/array_metadatas/process_1 I0418 23:55:15.495543 137972661872384 base_pytree_checkpoint_handler.py:130] [process=1] /jax/orbax/write/gbytes_per_sec: 36.965 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.731693983078 s) (per-host) I0418 23:55:15.495668 137972661872384 async_checkpointer.py:90] [process=1][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.684024s. I0418 23:55:23.593390 137972661872384 async_checkpointer.py:160] [process=1][thread=async_save] Background save thread done. Time taken: 50.781730s. I0418 23:55:23.593678 137975312025344 async_checkpointer.py:288] [process=1][thread=save_finalize] Done with waiting for background save thread=async_save. I0418 23:55:23.593804 137975312025344 async_checkpointer.py:298] [process=1][thread=save_finalize] No errors found in background save thread=async_save. I0418 23:55:23.593852 137975312025344 checkpoint_manager.py:2137] [process=1][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0418 23:55:23.596243 137975312025344 checkpoint_manager.py:2146] [process=1][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0418 23:55:23.596431 138105240442688 checkpoint_manager.py:2032] [process=1][thread=MainThread][step=9][wait_until_finished] Done waiting for Save Finalize thread (save_finalize) running at step=9. I0418 23:55:23.596583 138105240442688 checkpoint_manager.py:2009] [process=1][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0418 23:55:23.597564 138105240442688 metric_logger.py:196] completed step: 9, seconds: 0.148, TFLOP/s/device: 92.092, Tokens/s/device: 13881.076, 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: Sat Apr 18 23:55:33 UTC 2026 EXIT_CODE=0