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NousResearch / torchtitan Public

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feat: custom cpu offload engine#63

Draft

xrsrke wants to merge 21 commits intodev-updated-againNousResearch/torchtitan:dev-updated-againfrom

phuc/custom_offloadNousResearch/torchtitan:phuc/custom_offloadCopy head branch name to clipboard

Conversation Commits21 (21)Checks Files changed

Draft

feat: custom cpu offload engine#63
xrsrke wants to merge 21 commits intodev-updated-againfrom
phuc/custom_offload

Commits

Commits on Mar 26, 2026

Add reference CPU offload engine implementation
xrsrke
committed
Refactor CPU offload engine into modular, portable package
xrsrke
committed
Add comprehensive test suite for CPU offload engine (90 tests)
xrsrke
committed
Add async/performance proof tests (20 tests)
xrsrke
committed
Add gap tests from DeepSpeed, ColossalAI, Unsloth (22 tests)
xrsrke
committed
Add massive single-tensor offload tests (1GB, 5GB, 10GB, 20GB)
xrsrke
committed
Add README for CPU activation offload engine
xrsrke
committed
Trim README to focus on feature docs
xrsrke
committed
Add general-purpose offload: weights, gradients, torch.compile, CUDA graphs
xrsrke
committed
Integrate activation offload engine into torchtitan training loop
xrsrke
committed
Fix expert offload: use custom autograd function, not saved-tensor hooks
xrsrke
committed

Commits on Mar 27, 2026

Fix MoE activation offload: use torch.utils.checkpoint for expert recompute
xrsrke
committed
Benchmark results: expert checkpoint saves 24% memory, +14% TPS
xrsrke
committed
Add 10B-A1B benchmark: custom offload vs FSDP cpu_offload
xrsrke
committed
30B-A3B benchmark: weight-dominated regime, batch=2
xrsrke
committed
Cartesian product benchmark: act x weight+grad offload, 30B-A3B
xrsrke
committed
6-way offload benchmark: save_on_cpu, checkpoint, FSDP, combined
xrsrke
committed
Async offload with attention overlap: 2.5x faster, 25 GiB saved
xrsrke
committed
Add expert weight offloading with async D2H overlap
xrsrke
committed
Add weight offload + FSDP GPU optimizer wrapper
xrsrke
committed
Update configs and gitignore
xrsrke
committed

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