main (586e69205) vs feat/nnx-post-train-fixes (7f06c99ac)| Metric | main 586e69205 | feat/nnx-post-train-fixes 7f06c99ac | Diff (feat/nnx-post-train-fixes − main) |
|---|---|---|---|
| Parameters | 1.104 billion | 1.104 billion | — |
| Final loss | 8.1790 | 8.1790 | 0 |
| TFLOP/s | 92.363 | 92.147 | -0.216 |
| Tok/s | 13921.9 | 13889.4 | -32.574 |
| Avg s/step | 2.866 | 2.731 | -0.135 |
| 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: Thu Apr 23 07:19:29 UTC 2026 PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used. `rope_parameters`'s factor field must be a float >= 1, got 40 `rope_parameters`'s beta_fast field must be a float, got 32 `rope_parameters`'s beta_slow field must be a float, got 1 DeepseekV32Config got `key=rope_scaling` in kwargs but hasn't set it as attribute. For RoPE standardization you need to set `self.rope_parameters` in model's config. 2026-04-23 07:19:55.067334: 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) I0423 07:19:55.275804 139655908058944 max_utils.py:273] Attempting to initialize the jax distributed system... I0423 07:20:04.318543 139655908058944 distributed.py:149] Starting JAX distributed service on [::]:8482 I0423 07:20:04.321019 139655908058944 distributed.py:172] Connecting to JAX distributed service on mt-02-synthetic-0ykmm-slice-job-0-0.mt-02-synthetic-0ykmm:8482 I0423 07:20:05.030613 139655908058944 max_utils.py:284] Jax distributed system initialized! I0423 07:20:11.148716 139655908058944 max_utils.py:800] System Information: Jax Version: 0.9.2 I0423 07:20:11.148824 139655908058944 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0423 07:20:11.148865 139655908058944 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 I0423 07:20:11.148901 139655908058944 train_utils.py:361] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0423 07:20:11.841292 139655908058944 maxtext_utils.py:1604] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0423 07:20:11.841568 139655908058944 checkpointing.py:677] Setting up checkpoint logger... I0423 07:20:11.841624 139655908058944 checkpointing.py:233] Creating checkpoint manager with ocdbt=True and zarr3=True I0423 07:20:11.841680 139655908058944 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0423 07:20:11.842014 139655908058944 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 0x7f0375247680>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0423 07:20:14.733174 139655908058944 checkpointing.py:265] Enabling policy for fixed interval checkpointing. I0423 07:20:14.733413 139655908058944 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 0x7eefe4209c10>}, handler_registry=None I0423 07:20:14.733668 139655908058944 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7eefe4209c10>` 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`. I0423 07:20:14.733718 139655908058944 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7eefe4208140>` 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`. I0423 07:20:14.733754 139655908058944 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 0x7eefe4209c10>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7eefe4209c10>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7eefe4208140>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7eefe4208140>}). I0423 07:20:14.734077 139655908058944 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0423 07:20:14.734149 139655908058944 async_checkpointer.py:192] [process=5][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7eef1457da80> timeout: 1200 secs and primary_host=0 for async checkpoint writes I0423 07:20:16.020326 139655908058944 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_02_synthetic/checkpoints I0423 07:20:16.452138 139655908058944 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_20260423_071538/linen_xpk_main_20260423_071538_02_synthetic/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7eefe420a6c0> I0423 07:20:16.452325 139655908058944 checkpointing.py:301] Checkpoint manager created! I0423 07:20:17.379390 139655908058944 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0423 07:20:17.379505 139655908058944 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0423 07:20:17.763822 139655908058944 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0423 07:20:17.763913 139655908058944 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0423 07:20:17.780490 139655908058944 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0423 07:20:17.780547 139655908058944 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0423 07:20:17.804631 139655908058944 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0423 07:20:17.804714 139655908058944 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0423 07:20:17.821276 139655908058944 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0423 07:20:17.821336 139655908058944 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0423 07:20:17.837745 139655908058944 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0423 07:20:17.837804 139655908058944 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0423 07:20:17.862611 139655908058944 attentions.py:1198] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0423 07:20:17.862692 139655908058944 attentions.py:1198] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0423 07:20:17.883814 139655908058944 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0423 07:20:17.883880 139655908058944 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0423 07:20:18.091413 139655908058944 checkpointing.py:577] checkpoint manager exists so trying to load this run's existing checkpoint I0423 07:20:18.091522 139655908058944 checkpointing.py:665] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0423 07:20:19.519151 139655908058944 maxtext_utils.py:1707] params/params/decoder/decoder_norm/scale Shape: float32[2048] Logical: P('norm',) Physical: (None,) I0423 07:20:19.519281 139655908058944 maxtext_utils.py:1707] params/params/decoder/layers/mlp/wi_0/kernel Shape: float32[2048,16,7168] Logical: P('embed', 'layers', 'mlp') Physical: ('fsdp', None, None) I0423 07:20:19.519335 139655908058944 maxtext_utils.py:1707] params/params/decoder/layers/mlp/wi_1/kernel Shape: float32[2048,16,7168] Logical: P('embed', 'layers', 'mlp') Physical: ('fsdp', None, None) I0423 07:20:19.519392 139655908058944 maxtext_utils.py:1707] params/params/decoder/layers/mlp/wo/kernel Shape: float32[7168,16,2048] Logical: P('mlp', 'layers', 'embed') Physical: (None, None, 'fsdp') I0423 07:20:19.519443 139655908058944 maxtext_utils.py:1707] params/params/decoder/layers/post_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: P('norm', 'layers') Physical: (None, None) I0423 07:20:19.519481 139655908058944 maxtext_utils.py:1707] params/params/decoder/layers/pre_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: P('norm', 'layers') Physical: (None, None) I0423 07:20:19.519532 139655908058944 maxtext_utils.py:1707] 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) I0423 07:20:19.519581 139655908058944 maxtext_utils.py:1707] 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') I0423 07:20:19.519620 139655908058944 maxtext_utils.py:1707] 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) I0423 07:20:19.519667 139655908058944 maxtext_utils.py:1707] 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) I0423 07:20:19.519718 139655908058944 maxtext_utils.py:1707] params/params/decoder/logits_dense/kernel Shape: float32[2048,32000] Logical: P('embed_vocab', 'vocab') Physical: ('fsdp', None) I0423 07:20:19.519766 139655908058944 maxtext_utils.py:1707] params/params/token_embedder/embedding Shape: float32[32000,2048] Logical: P('vocab', 'embed_vocab') Physical: (None, 'fsdp') I0423 07:20:20.013900 139655908058944 train.py:155] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0423 07:20:20.013997 139655908058944 train.py:155] train/xent Physical: float32[32,2048]............................................ ('fsdp', None). I0423 07:20:20.029515 139655908058944 train.py:162] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0423 07:20:20.029575 139655908058944 train.py:162] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None). I0423 07:20:30.845520 139655908058944 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. I0423 07:20:30.846318 139655908058944 metric_logger.py:301] number parameters: 1.104 billion I0423 07:20:42.550024 139655908058944 checkpointing.py:772] Waiting for step 0 to finish before checkpoint... I0423 07:20:42.781255 139655908058944 checkpointing.py:776] Waited 0.23120713233947754 seconds for step 0 to finish before starting checkpointing. I0423 07:20:42.784219 139655908058944 checkpoint_manager.py:2009] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0423 07:20:42.785632 139655908058944 checkpoint_manager.py:1512] [process=5] Saving checkpoint at step 0 I0423 07:20:42.787039 139655908058944 event_tracking.py:70] [process=5] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_02_synthetic/checkpoints/0. I0423 07:20:43.550182 139655908058944 signaling_client.py:364] Using JaxDistributedSignalingClient I0423 07:20:43.551042 139655908058944 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array. I0423 07:20:43.551099 139655908058944 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 I0423 07:20:43.830645 139655908058944 base_pytree_checkpoint_handler.py:154] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.280530s I0423 07:20:43.830833 139655908058944 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/blocking_gbytes_per_sec: 5.392 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.2860729694366455 s) (per-host) I0423 07:20:43.830886 139655908058944 base_pytree_checkpoint_handler.py:768] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.286136s (batch_requests_ready=0.002266s, total_serialization_initiated=0.283798s, others=0.000072s) I0423 07:20:43.830981 139655908058944 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.290475s (all_items=0.000035s, per_item={'items': '0.00003505'}, temp_paths=0.290440) I0423 07:20:43.831795 139655908058944 event_tracking.py:125] [process=5] [async] Finished blocking save in 1.05 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_02_synthetic/checkpoints/0. I0423 07:20:43.832066 139531032622848 async_checkpointer.py:76] [process=5][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-23 07:40:43.832035 I0423 07:20:43.834102 139655908058944 checkpoint_manager.py:1560] [process=5][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0423 07:20:43.834341 139529408280320 async_checkpointer.py:280] [process=5][thread=save_finalize] Waiting for background save thread=async_save. I0423 07:20:43.834455 139655908058944 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_02_synthetic/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776928842.7841992, 'wait_for_prev_duration_secs': 8.749961853027344e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776928842.7856824, 'checkpointer_blocking_duration_secs': 1.0465281009674072, 'get_old_steps_start_time': 1776928843.832237, 'get_old_steps_duration_secs': 3.4332275390625e-05, 'checkpoint_manager_blocking_start_time': 1776928842.7817867, 'checkpoint_manager_blocking_duration_secs': 1.0526270866394043} I0423 07:20:43.834566 139655908058944 checkpointing.py:408] Started an asynchronous checkpoint save for step 0 I0423 07:20:43.834616 139655908058944 max_utils.py:750] Memstats: After params initialized: I0423 07:20:43.834678 139655908058944 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_18(process=5,(2,4,0,0)) I0423 07:20:43.834713 139655908058944 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_19(process=5,(3,4,0,0)) I0423 07:20:43.834739 139655908058944 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_22(process=5,(2,5,0,0)) I0423 07:20:43.834765 139655908058944 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_23(process=5,(3,5,0,0)) I0423 07:20:44.145758 139655908058944 metric_logger.py:196] completed step: 0, seconds: 11.704, TFLOP/s/device: 1.161, Tokens/s/device: 174.989, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875 I0423 07:20:44.319493 139655908058944 metric_logger.py:196] completed step: 1, seconds: 1.594, TFLOP/s/device: 8.523, Tokens/s/device: 1284.664, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875 I0423 07:20:44.775850 139655908058944 metric_logger.py:196] completed step: 2, seconds: 0.027, TFLOP/s/device: 512.470, Tokens/s/device: 77245.125, total_weights: 65536, loss: 10.262, lm_loss: 10.262, perplexity: 28637.129 I0423 07:20:44.923059 139655908058944 metric_logger.py:196] completed step: 3, seconds: 0.456, TFLOP/s/device: 29.775, Tokens/s/device: 4488.000, total_weights: 65536, loss: 9.734, lm_loss: 9.734, perplexity: 16889.203 I0423 07:20:45.217923 139655908058944 metric_logger.py:196] completed step: 4, seconds: 0.153, TFLOP/s/device: 88.584, Tokens/s/device: 13352.371, total_weights: 65536, loss: 9.277, lm_loss: 9.277, perplexity: 10694.614 I0423 07:20:45.223979 139655908058944 metric_logger.py:196] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.387, Tokens/s/device: 13925.626, total_weights: 65536, loss: 8.892, lm_loss: 8.892, perplexity: 7270.717 I0423 07:20:47.272935 2750 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0423 07:20:49.745506 139529432327936 array_metadata_store.py:203] [process=5][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_02_synthetic/checkpoints/0/items/array_metadatas/process_5 I0423 07:21:08.195535 139655908058944 metric_logger.py:196] completed step: 6, seconds: 0.295, TFLOP/s/device: 45.988, Tokens/s/device: 6931.752, total_weights: 65536, loss: 8.592, lm_loss: 8.592, perplexity: 5390.759 I0423 07:21:08.342704 139655908058944 metric_logger.py:196] completed step: 7, seconds: 22.825, TFLOP/s/device: 0.595, Tokens/s/device: 89.727, total_weights: 65536, loss: 8.384, lm_loss: 8.384, perplexity: 4376.905 I0423 07:21:08.490156 139655908058944 metric_logger.py:196] completed step: 8, seconds: 0.152, TFLOP/s/device: 89.123, Tokens/s/device: 13433.648, total_weights: 65536, loss: 8.255, lm_loss: 8.255, perplexity: 3846.406 I0423 07:21:08.636679 139655908058944 checkpointing.py:772] Waiting for step 9 to finish before checkpoint... I0423 07:21:08.637365 139655908058944 checkpointing.py:776] Waited 0.0007276535034179688 seconds for step 9 to finish before starting checkpointing. I0423 07:21:08.639459 139655908058944 checkpoint_manager.py:2020] [process=5][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0423 07:21:20.084813 139531032622848 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/gbytes_per_sec: 43.229 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 36.54001307487488 s) (per-host) I0423 07:21:20.084940 139531032622848 async_checkpointer.py:90] [process=5][thread=async_save] 3 Handler Commit operations completed. Time taken: 36.252766s. I0423 07:21:29.967640 139531032622848 async_checkpointer.py:160] [process=5][thread=async_save] Background save thread done. Time taken: 46.135448s. I0423 07:21:29.967874 139529408280320 async_checkpointer.py:288] [process=5][thread=save_finalize] Done with waiting for background save thread=async_save. I0423 07:21:29.967930 139529408280320 async_checkpointer.py:298] [process=5][thread=save_finalize] No errors found in background save thread=async_save. I0423 07:21:29.967984 139529408280320 checkpoint_manager.py:2137] [process=5][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0423 07:21:29.970126 139529408280320 checkpoint_manager.py:2146] [process=5][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0423 07:21:29.970277 139655908058944 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. W0423 07:21:29.970407 139655908058944 checkpoint_manager.py:1452] Waiting for previous save to complete took 21.330949 seconds. If this number is high, consider checkpointing less frequently. I0423 07:21:29.972363 139655908058944 checkpoint_manager.py:1512] [process=5] Saving checkpoint at step 9 I0423 07:21:29.974469 139655908058944 event_tracking.py:70] [process=5] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_02_synthetic/checkpoints/9. I0423 07:21:30.686305 139655908058944 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array. I0423 07:21:30.686399 139655908058944 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 I0423 07:21:30.727968 139655908058944 base_pytree_checkpoint_handler.py:154] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.042744s I0423 07:21:30.728131 139655908058944 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/blocking_gbytes_per_sec: 33.381 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.04621148109436035 s) (per-host) I0423 07:21:30.728179 139655908058944 base_pytree_checkpoint_handler.py:768] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.046268s (batch_requests_ready=0.001805s, total_serialization_initiated=0.044401s, others=0.000062s) I0423 07:21:30.728268 139655908058944 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.050361s (all_items=0.000016s, per_item={'items': '0.00001597'}, temp_paths=0.050345) I0423 07:21:30.728916 139655908058944 event_tracking.py:125] [process=5] [async] Finished blocking save in 0.76 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_02_synthetic/checkpoints/9. I0423 07:21:30.729275 139529408280320 async_checkpointer.py:76] [process=5][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-23 07:41:30.729237 I0423 07:21:30.731273 139655908058944 checkpoint_manager.py:1560] [process=5][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0423 07:21:30.731512 139529432327936 async_checkpointer.py:280] [process=5][thread=save_finalize] Waiting for background save thread=async_save. I0423 07:21:30.731616 139655908058944 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_02_synthetic/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776928868.6394284, 'wait_for_prev_duration_secs': 21.330949068069458, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776928889.9724047, 'checkpointer_blocking_duration_secs': 0.7570161819458008, 'get_old_steps_start_time': 1776928890.7294452, 'get_old_steps_duration_secs': 3.409385681152344e-05, 'checkpoint_manager_blocking_start_time': 1776928868.6375947, 'checkpoint_manager_blocking_duration_secs': 22.09398651123047} I0423 07:21:30.731788 139655908058944 checkpointing.py:408] Started an asynchronous checkpoint save for step 9 I0423 07:21:30.731833 139655908058944 checkpoint_manager.py:2020] [process=5][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0423 07:21:37.114936 139507831654144 array_metadata_store.py:203] [process=5][thread=array_type_handler] Wrote 39 array_metadata.ArrayMetadata to gs://lance-maxtext/linen_ckpt_xpk_main_20260423_071538/linen_xpk_main_20260423_071538_02_synthetic/checkpoints/9/items/array_metadatas/process_5 I0423 07:22:13.359817 139529408280320 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/gbytes_per_sec: 37.012 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.6778564453125 s) (per-host) I0423 07:22:13.359938 139529408280320 async_checkpointer.py:90] [process=5][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.630550s. I0423 07:22:22.374758 139529408280320 async_checkpointer.py:160] [process=5][thread=async_save] Background save thread done. Time taken: 51.645355s. I0423 07:22:22.375072 139529432327936 async_checkpointer.py:288] [process=5][thread=save_finalize] Done with waiting for background save thread=async_save. I0423 07:22:22.375187 139529432327936 async_checkpointer.py:298] [process=5][thread=save_finalize] No errors found in background save thread=async_save. I0423 07:22:22.375235 139529432327936 checkpoint_manager.py:2137] [process=5][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0423 07:22:22.376902 139529432327936 checkpoint_manager.py:2146] [process=5][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0423 07:22:22.377092 139655908058944 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. I0423 07:22:22.377234 139655908058944 checkpoint_manager.py:2009] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0423 07:22:22.378117 139655908058944 metric_logger.py:196] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.363, Tokens/s/device: 13921.934, 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: Thu Apr 23 07:22:34 UTC 2026 EXIT_CODE=0
XPK Start: Thu Apr 23 12:49:22 UTC 2026 PyTorch was not found. Models won't be available and only tokenizers, configuration and file/data utilities can be used. `rope_parameters`'s factor field must be a float >= 1, got 40 `rope_parameters`'s beta_fast field must be a float, got 32 `rope_parameters`'s beta_slow field must be a float, got 1 DeepseekV32Config got `key=rope_scaling` in kwargs but hasn't set it as attribute. For RoPE standardization you need to set `self.rope_parameters` in model's config. 2026-04-23 12:49:47.401824: 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) I0423 12:49:47.612414 136727656159040 max_utils.py:273] Attempting to initialize the jax distributed system... I0423 12:49:56.651754 136727656159040 distributed.py:149] Starting JAX distributed service on [::]:8482 I0423 12:49:56.654136 136727656159040 distributed.py:172] Connecting to JAX distributed service on mt-02-synthetic-tl54c-slice-job-0-0.mt-02-synthetic-tl54c:8482 I0423 12:49:58.082163 136727656159040 max_utils.py:284] Jax distributed system initialized! I0423 12:50:04.469350 136727656159040 max_utils.py:800] System Information: Jax Version: 0.9.2 I0423 12:50:04.469463 136727656159040 max_utils.py:801] System Information: Jaxlib Version: 0.9.2 I0423 12:50:04.469516 136727656159040 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 I0423 12:50:04.469564 136727656159040 train_utils.py:391] WARNING: Sequence packing is essentially ignored for synthetic data. Please use a real dataset to use sequence packing. I0423 12:50:05.182371 136727656159040 maxtext_utils.py:1771] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0423 12:50:05.182982 136727656159040 maxtext_utils.py:1771] Num_devices: 32, shape (1, 1, 1, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1) I0423 12:50:05.183164 136727656159040 checkpointing.py:688] Setting up checkpoint logger... I0423 12:50:05.183216 136727656159040 checkpointing.py:234] Creating checkpoint manager with ocdbt=True and zarr3=True I0423 12:50:05.183260 136727656159040 pytree_checkpoint_handler.py:592] save_device_host_concurrent_bytes=None I0423 12:50:05.183612 136727656159040 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 0x7c59d171f3b0>, enable_pinned_host_transfer=False, save_concurrent_bytes: 96000000000 (89.4 GiB), restore_concurrent_bytes: 96000000000 (89.4 GiB) I0423 12:50:08.029918 136727656159040 checkpointing.py:266] Enabling policy for fixed interval checkpointing. I0423 12:50:08.030156 136727656159040 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 0x7c457c42b0b0>}, handler_registry=None I0423 12:50:08.030393 136727656159040 composite_checkpoint_handler.py:237] Deferred registration for item: "items". Adding handler `<orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7c457c42b0b0>` 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`. I0423 12:50:08.030445 136727656159040 composite_checkpoint_handler.py:237] Deferred registration for item: "metrics". Adding handler `<orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7c457c285dc0>` 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`. I0423 12:50:08.030480 136727656159040 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 0x7c457c42b0b0>, ('items', <class 'orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeRestoreArgs'>): <orbax.checkpoint._src.handlers.pytree_checkpoint_handler.PyTreeCheckpointHandler object at 0x7c457c42b0b0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonSaveArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7c457c285dc0>, ('metrics', <class 'orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonRestoreArgs'>): <orbax.checkpoint._src.handlers.json_checkpoint_handler.JsonCheckpointHandler object at 0x7c457c285dc0>}). I0423 12:50:08.030814 136727656159040 abstract_checkpointer.py:35] orbax-checkpoint version: 0.11.34 I0423 12:50:08.030883 136727656159040 async_checkpointer.py:192] [process=5][thread=MainThread] Using barrier_sync_fn: <function get_barrier_sync_fn.<locals>._fn at 0x7c4478579d00> timeout: 1200 secs and primary_host=0 for async checkpoint writes I0423 12:50:08.830345 136727656159040 checkpoint_manager.py:1812] Found 0 checkpoint steps in gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260423_124541/linen_xpk_feat_nnx_post_train_fixes_20260423_124541_02_synthetic/checkpoints I0423 12:50:09.254699 136727656159040 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_20260423_124541/linen_xpk_feat_nnx_post_train_fixes_20260423_124541_02_synthetic/checkpoints: <orbax.checkpoint.checkpoint_manager.CheckpointManager object at 0x7c457c2897c0> I0423 12:50:09.254867 136727656159040 checkpointing.py:302] Checkpoint manager created! I0423 12:50:10.187883 136727656159040 nnx_wrappers.py:437] Unknown Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_norm_length', 'activation_embed'). I0423 12:50:10.187994 136727656159040 nnx_wrappers.py:437] Unknown Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0423 12:50:10.564911 136727656159040 attentions.py:1088] attentions/inputs_q Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0423 12:50:10.565005 136727656159040 attentions.py:1088] attentions/inputs_q Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0423 12:50:10.587628 136727656159040 attentions.py:1089] attentions/inputs_kv Logical: bfloat16[32,2048,2048]...................................... ('activation_batch', 'activation_attn_length', 'activation_attn_embed'). I0423 12:50:10.587742 136727656159040 attentions.py:1089] attentions/inputs_kv Physical: bfloat16[32,2048,2048]...................................... ('fsdp', None, None). I0423 12:50:10.612066 136727656159040 attentions.py:1154] attentions/query Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0423 12:50:10.612137 136727656159040 attentions.py:1154] attentions/query Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0423 12:50:10.628792 136727656159040 attentions.py:1155] attentions/key Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0423 12:50:10.628857 136727656159040 attentions.py:1155] attentions/key Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0423 12:50:10.645645 136727656159040 attentions.py:1156] attentions/value Logical: bfloat16[32,2048,16,128].................................... ('activation_kv_batch', 'activation_attn_length', 'activation_kv_heads', 'activation_kv_head_dim'). I0423 12:50:10.645715 136727656159040 attentions.py:1156] attentions/value Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0423 12:50:10.670870 136727656159040 attentions.py:1198] attentions/out Logical: bfloat16[32,2048,16,128].................................... ('activation_batch', 'activation_attn_length', 'activation_heads', 'activation_kv'). I0423 12:50:10.670936 136727656159040 attentions.py:1198] attentions/out Physical: bfloat16[32,2048,16,128].................................... ('fsdp', None, None, None). I0423 12:50:10.692069 136727656159040 linears.py:525] linears/x Logical: bfloat16[32,2048,7168]...................................... ('activation_batch', 'activation_length', 'activation_mlp'). I0423 12:50:10.692133 136727656159040 linears.py:525] linears/x Physical: bfloat16[32,2048,7168]...................................... ('fsdp', None, None). I0423 12:50:10.913346 136727656159040 checkpointing.py:578] checkpoint manager exists so trying to load this run's existing checkpoint I0423 12:50:10.913456 136727656159040 checkpointing.py:676] No existing checkpoints found, not restoring checkpoint. fsdp: 32 I0423 12:50:12.347192 136727656159040 maxtext_utils.py:1880] params/params/decoder/decoder_norm/scale Shape: float32[2048] Logical: P('norm',) Physical: (None,) I0423 12:50:12.347321 136727656159040 maxtext_utils.py:1880] params/params/decoder/layers/mlp/wi_0/kernel Shape: float32[2048,16,7168] Logical: P('embed', 'layers', 'mlp') Physical: ('fsdp', None, None) I0423 12:50:12.347378 136727656159040 maxtext_utils.py:1880] params/params/decoder/layers/mlp/wi_1/kernel Shape: float32[2048,16,7168] Logical: P('embed', 'layers', 'mlp') Physical: ('fsdp', None, None) I0423 12:50:12.347438 136727656159040 maxtext_utils.py:1880] params/params/decoder/layers/mlp/wo/kernel Shape: float32[7168,16,2048] Logical: P('mlp', 'layers', 'embed') Physical: (None, None, 'fsdp') I0423 12:50:12.347497 136727656159040 maxtext_utils.py:1880] params/params/decoder/layers/post_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: P('norm', 'layers') Physical: (None, None) I0423 12:50:12.347539 136727656159040 maxtext_utils.py:1880] params/params/decoder/layers/pre_self_attention_layer_norm/scale Shape: float32[2048,16] Logical: P('norm', 'layers') Physical: (None, None) I0423 12:50:12.347601 136727656159040 maxtext_utils.py:1880] 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) I0423 12:50:12.347684 136727656159040 maxtext_utils.py:1880] 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') I0423 12:50:12.347739 136727656159040 maxtext_utils.py:1880] 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) I0423 12:50:12.347777 136727656159040 maxtext_utils.py:1880] 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) I0423 12:50:12.347825 136727656159040 maxtext_utils.py:1880] params/params/decoder/logits_dense/kernel Shape: float32[2048,32000] Logical: P('embed_vocab', 'vocab') Physical: ('fsdp', None) I0423 12:50:12.347878 136727656159040 maxtext_utils.py:1880] params/params/token_embedder/embedding Shape: float32[32000,2048] Logical: P('vocab', 'embed_vocab') Physical: (None, 'fsdp') I0423 12:50:12.846599 136727656159040 train.py:157] train/xent Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0423 12:50:12.846707 136727656159040 train.py:157] train/xent Physical: float32[32,2048]............................................ ('fsdp', None). I0423 12:50:12.862438 136727656159040 train.py:164] train/z_loss Logical: float32[32,2048]............................................ ('activation_embed_and_logits_batch', 'activation_length'). I0423 12:50:12.862498 136727656159040 train.py:164] train/z_loss Physical: float32[32,2048]............................................ ('fsdp', None). I0423 12:50:23.824398 136727656159040 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. I0423 12:50:23.825172 136727656159040 metric_logger.py:301] number parameters: 1.104 billion I0423 12:50:34.990988 136727656159040 checkpointing.py:794] Waiting for step 0 to finish before checkpoint... I0423 12:50:35.228227 136727656159040 checkpointing.py:798] Waited 0.23722338676452637 seconds for step 0 to finish before starting checkpointing. I0423 12:50:35.230906 136727656159040 checkpoint_manager.py:2009] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0423 12:50:35.232702 136727656159040 checkpoint_manager.py:1512] [process=5] Saving checkpoint at step 0 I0423 12:50:35.234361 136727656159040 event_tracking.py:70] [process=5] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260423_124541/linen_xpk_feat_nnx_post_train_fixes_20260423_124541_02_synthetic/checkpoints/0. I0423 12:50:35.978409 136727656159040 signaling_client.py:364] Using JaxDistributedSignalingClient I0423 12:50:35.979384 136727656159040 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array. I0423 12:50:35.979442 136727656159040 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 I0423 12:50:36.261815 136727656159040 base_pytree_checkpoint_handler.py:154] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.283477s I0423 12:50:36.262003 136727656159040 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/blocking_gbytes_per_sec: 5.336 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.28908371925354004 s) (per-host) I0423 12:50:36.262057 136727656159040 base_pytree_checkpoint_handler.py:768] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.289150s (batch_requests_ready=0.002208s, total_serialization_initiated=0.286867s, others=0.000074s) I0423 12:50:36.262158 136727656159040 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.293246s (all_items=0.000018s, per_item={'items': '0.00001836'}, temp_paths=0.293228) I0423 12:50:36.262967 136727656159040 event_tracking.py:125] [process=5] [async] Finished blocking save in 1.03 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260423_124541/linen_xpk_feat_nnx_post_train_fixes_20260423_124541_02_synthetic/checkpoints/0. I0423 12:50:36.263305 136598945502976 async_checkpointer.py:76] [process=5][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-23 13:10:36.263267 I0423 12:50:36.265395 136727656159040 checkpoint_manager.py:1560] [process=5][thread=MainThread][step=0] Starting CheckpointManager Save Finalize thread=save_finalize I0423 12:50:36.265704 136598365288192 async_checkpointer.py:280] [process=5][thread=save_finalize] Waiting for background save thread=async_save. I0423 12:50:36.265861 136727656159040 standard_logger.py:34] {'step': 0, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260423_124541/linen_xpk_feat_nnx_post_train_fixes_20260423_124541_02_synthetic/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776948635.2308884, 'wait_for_prev_duration_secs': 5.888938903808594e-05, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776948635.232741, 'checkpointer_blocking_duration_secs': 1.0307135581970215, 'get_old_steps_start_time': 1776948636.2634816, 'get_old_steps_duration_secs': 3.1948089599609375e-05, 'checkpoint_manager_blocking_start_time': 1776948635.2287652, 'checkpoint_manager_blocking_duration_secs': 1.0370562076568604} I0423 12:50:36.265978 136727656159040 checkpointing.py:409] Started an asynchronous checkpoint save for step 0 I0423 12:50:36.266030 136727656159040 max_utils.py:750] Memstats: After params initialized: I0423 12:50:36.266080 136727656159040 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_18(process=5,(2,4,0,0)) I0423 12:50:36.266113 136727656159040 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_19(process=5,(3,4,0,0)) I0423 12:50:36.266145 136727656159040 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_22(process=5,(2,5,0,0)) I0423 12:50:36.266172 136727656159040 max_utils.py:756] Using (GB) 0.43 / 31.25 (1.376000%) on TPU_23(process=5,(3,5,0,0)) I0423 12:50:36.579710 136727656159040 metric_logger.py:196] completed step: 0, seconds: 11.166, TFLOP/s/device: 1.217, Tokens/s/device: 183.419, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875 I0423 12:50:36.830067 136727656159040 metric_logger.py:196] completed step: 1, seconds: 1.587, TFLOP/s/device: 8.560, Tokens/s/device: 1290.287, total_weights: 65536, loss: 10.874, lm_loss: 10.874, perplexity: 52779.875 I0423 12:50:37.268454 136727656159040 metric_logger.py:196] completed step: 2, seconds: 0.103, TFLOP/s/device: 131.838, Tokens/s/device: 19872.112, total_weights: 65536, loss: 10.262, lm_loss: 10.262, perplexity: 28637.129 I0423 12:50:37.415730 136727656159040 metric_logger.py:196] completed step: 3, seconds: 0.439, TFLOP/s/device: 30.985, Tokens/s/device: 4670.425, total_weights: 65536, loss: 9.734, lm_loss: 9.734, perplexity: 16889.203 I0423 12:50:37.711001 136727656159040 metric_logger.py:196] completed step: 4, seconds: 0.153, TFLOP/s/device: 88.837, Tokens/s/device: 13390.434, total_weights: 65536, loss: 9.277, lm_loss: 9.277, perplexity: 10694.614 I0423 12:50:37.716537 136727656159040 metric_logger.py:196] completed step: 5, seconds: 0.147, TFLOP/s/device: 92.326, Tokens/s/device: 13916.447, total_weights: 65536, loss: 8.892, lm_loss: 8.892, perplexity: 7270.717 I0423 12:50:39.599407 2849 google_auth_provider.cc:181] Running on GCE, using service account 562977990677-compute@developer.gserviceaccount.com I0423 12:50:41.564487 136598373680896 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_20260423_124541/linen_xpk_feat_nnx_post_train_fixes_20260423_124541_02_synthetic/checkpoints/0/items/array_metadatas/process_5 I0423 12:50:59.417786 136727656159040 metric_logger.py:196] completed step: 6, seconds: 0.296, TFLOP/s/device: 45.953, Tokens/s/device: 6926.571, total_weights: 65536, loss: 8.592, lm_loss: 8.592, perplexity: 5390.759 I0423 12:50:59.565286 136727656159040 metric_logger.py:196] completed step: 7, seconds: 21.554, TFLOP/s/device: 0.630, Tokens/s/device: 95.017, total_weights: 65536, loss: 8.384, lm_loss: 8.384, perplexity: 4376.905 I0423 12:50:59.712565 136727656159040 metric_logger.py:196] completed step: 8, seconds: 0.153, TFLOP/s/device: 89.039, Tokens/s/device: 13420.972, total_weights: 65536, loss: 8.255, lm_loss: 8.255, perplexity: 3846.406 I0423 12:50:59.859234 136727656159040 checkpointing.py:794] Waiting for step 9 to finish before checkpoint... I0423 12:50:59.859923 136727656159040 checkpointing.py:798] Waited 0.0007109642028808594 seconds for step 9 to finish before starting checkpointing. I0423 12:50:59.861931 136727656159040 checkpoint_manager.py:2020] [process=5][thread=MainThread][step=0][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0423 12:51:13.217483 136598945502976 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/gbytes_per_sec: 42.412 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 37.24452829360962 s) (per-host) I0423 12:51:13.217603 136598945502976 async_checkpointer.py:90] [process=5][thread=async_save] 3 Handler Commit operations completed. Time taken: 36.954186s. I0423 12:51:22.976878 136598945502976 async_checkpointer.py:160] [process=5][thread=async_save] Background save thread done. Time taken: 46.713445s. I0423 12:51:22.977170 136598365288192 async_checkpointer.py:288] [process=5][thread=save_finalize] Done with waiting for background save thread=async_save. I0423 12:51:22.977285 136598365288192 async_checkpointer.py:298] [process=5][thread=save_finalize] No errors found in background save thread=async_save. I0423 12:51:22.977334 136598365288192 checkpoint_manager.py:2137] [process=5][thread=save_finalize][step=0] CheckpointManager Save Finalize is syncing with other hosts... I0423 12:51:22.978838 136598365288192 checkpoint_manager.py:2146] [process=5][thread=save_finalize][step=0] CheckpointManager Save Finalize is done on all hosts. I0423 12:51:22.979011 136727656159040 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. W0423 12:51:22.979142 136727656159040 checkpoint_manager.py:1452] Waiting for previous save to complete took 23.117211 seconds. If this number is high, consider checkpointing less frequently. I0423 12:51:22.981098 136727656159040 checkpoint_manager.py:1512] [process=5] Saving checkpoint at step 9 I0423 12:51:22.983236 136727656159040 event_tracking.py:70] [process=5] [async] Started save checkpoint @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260423_124541/linen_xpk_feat_nnx_post_train_fixes_20260423_124541_02_synthetic/checkpoints/9. I0423 12:51:23.285319 136727656159040 jax_array_handlers.py:360] Scheduling D2H of 39 prioritized jax.Array. I0423 12:51:23.285411 136727656159040 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 I0423 12:51:23.319103 136727656159040 base_pytree_checkpoint_handler.py:154] [process=5][thread=MainThread] Initiated "orbax.checkpoint._src.serialization.jax_array_handlers.ArrayHandler".serialize. Time taken: 0.034971s I0423 12:51:23.319279 136727656159040 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/blocking_gbytes_per_sec: 40.197 GiB/s (total gbytes: 1.5 GiB) (time elapsed: 0.0383756160736084 s) (per-host) I0423 12:51:23.319332 136727656159040 base_pytree_checkpoint_handler.py:768] [process=5][thread=MainThread] Initiated Pytree async_save. Time taken: 0.038439s (batch_requests_ready=0.001756s, total_serialization_initiated=0.036611s, others=0.000072s) I0423 12:51:23.319420 136727656159040 composite_checkpoint_handler.py:715] [process=5][thread=MainThread] Initiated CompositeCheckpointHandler.async_save. Time taken: 0.042414s (all_items=0.000015s, per_item={'items': '0.00001550'}, temp_paths=0.042399) I0423 12:51:23.320165 136727656159040 event_tracking.py:125] [process=5] [async] Finished blocking save in 0.34 seconds. Continuing save @ gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260423_124541/linen_xpk_feat_nnx_post_train_fixes_20260423_124541_02_synthetic/checkpoints/9. I0423 12:51:23.320515 136598365288192 async_checkpointer.py:76] [process=5][thread=async_save] Background save thread started. Deadline for this save operation is 2026-04-23 13:11:23.320479 I0423 12:51:23.322422 136727656159040 checkpoint_manager.py:1560] [process=5][thread=MainThread][step=9] Starting CheckpointManager Save Finalize thread=save_finalize I0423 12:51:23.322671 136598916044544 async_checkpointer.py:280] [process=5][thread=save_finalize] Waiting for background save thread=async_save. I0423 12:51:23.322803 136727656159040 standard_logger.py:34] {'step': 9, 'event_type': 'save', 'directory': 'gs://lance-maxtext/linen_ckpt_xpk_feat_nnx_post_train_fixes_20260423_124541/linen_xpk_feat_nnx_post_train_fixes_20260423_124541_02_synthetic/checkpoints', 'reached_preemption': False, 'preemption_received_at': None, 'synchronous': False, 'wait_for_prev_start_time': 1776948659.8619013, 'wait_for_prev_duration_secs': 23.117210865020752, 'time_between_consecutive_saves_sec': None, 'checkpointer_blocking_start_time': 1776948682.9811382, 'checkpointer_blocking_duration_secs': 0.33953142166137695, 'get_old_steps_start_time': 1776948683.3206942, 'get_old_steps_duration_secs': 2.956390380859375e-05, 'checkpoint_manager_blocking_start_time': 1776948659.8601573, 'checkpoint_manager_blocking_duration_secs': 23.462614059448242} I0423 12:51:23.322960 136727656159040 checkpointing.py:409] Started an asynchronous checkpoint save for step 9 I0423 12:51:23.323006 136727656159040 checkpoint_manager.py:2020] [process=5][thread=MainThread][step=9][wait_until_finished] Waiting for Save Finalize thread (save_finalize) to complete. I0423 12:51:28.417406 136598924437248 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_20260423_124541/linen_xpk_feat_nnx_post_train_fixes_20260423_124541_02_synthetic/checkpoints/9/items/array_metadatas/process_5 I0423 12:52:05.484892 136598365288192 base_pytree_checkpoint_handler.py:130] [process=5] /jax/orbax/write/gbytes_per_sec: 37.428 MiB/s (total gbytes: 1.5 GiB) (time elapsed: 42.20395278930664 s) (per-host) I0423 12:52:05.485016 136598365288192 async_checkpointer.py:90] [process=5][thread=async_save] 3 Handler Commit operations completed. Time taken: 42.164390s. I0423 12:52:12.429701 136598365288192 async_checkpointer.py:160] [process=5][thread=async_save] Background save thread done. Time taken: 49.109060s. I0423 12:52:12.429957 136598916044544 async_checkpointer.py:288] [process=5][thread=save_finalize] Done with waiting for background save thread=async_save. I0423 12:52:12.430085 136598916044544 async_checkpointer.py:298] [process=5][thread=save_finalize] No errors found in background save thread=async_save. I0423 12:52:12.430135 136598916044544 checkpoint_manager.py:2137] [process=5][thread=save_finalize][step=9] CheckpointManager Save Finalize is syncing with other hosts... I0423 12:52:12.431470 136598916044544 checkpoint_manager.py:2146] [process=5][thread=save_finalize][step=9] CheckpointManager Save Finalize is done on all hosts. I0423 12:52:12.431669 136727656159040 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. I0423 12:52:12.431818 136727656159040 checkpoint_manager.py:2009] [process=5][thread=MainThread][wait_until_finished] No Save Finalize thread to wait for. Returning. I0423 12:52:12.432780 136727656159040 metric_logger.py:196] completed step: 9, seconds: 0.147, TFLOP/s/device: 92.147, Tokens/s/device: 13889.360, 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: Thu Apr 23 12:52:22 UTC 2026 EXIT_CODE=0