Gahow Wang 2d48f25e66 phase 11: GPU-resident KV cache ...

- GpuKVCache: pre-allocated GPU buffers, D2D copy append at offset
- Per-head strided layout [num_kv_heads, max_seq_len, head_dim]
- Fixed critical bug: seq_len must advance AFTER all layers write
  (not inside the loop per-layer)
- GpuBuffer::copy_from_device_at for offset-based D2D copy
- Tensor::from_storage constructor for wrapping raw GPU buffers
- Exported Storage and Dims from xserv-tensor

Correctness: GPU KV cache vs CPU KV cache = 50/50 bit-identical
Performance: ~neutral (KV cache was never the main bottleneck —
reshape/merge/transpose CPU round-trips dominate for Qwen3-8B)

TTFT: 122ms, TBT: 142ms, 7.0 tok/s (marginal change from 7.3)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-05-22 11:50:12 +08:00

..

benchmarks

phase 10: add Qwen3-8B benchmark + performance fix

2026-05-22 10:25:33 +08:00

00-roadmap.md

phase 0+1: project scaffold + xserv-cuda crate

2026-05-21 18:40:22 +08:00

01-cuda-ffi.md

docs: add design docs + takeaways for Phase 2 and Phase 3

2026-05-21 20:59:45 +08:00

02-tensor.md

docs: add design docs + takeaways for Phase 2 and Phase 3

2026-05-21 20:59:45 +08:00

03-gemm.md

docs: add design docs + takeaways for Phase 2 and Phase 3

2026-05-21 20:59:45 +08:00

04-transformer-kernels.md

phase 4: transformer core kernels

2026-05-21 21:07:24 +08:00

05-attention.md

phase 5: naive multi-head attention

2026-05-21 21:17:23 +08:00

06-model-loading.md

phase 6+7+8: model loading, BPE tokenizer, GPT-2 inference (Milestone ①)

2026-05-21 22:04:00 +08:00

07-tokenizer.md

phase 6+7+8: model loading, BPE tokenizer, GPT-2 inference (Milestone ①)

2026-05-21 22:04:00 +08:00

08-gpt2.md

phase 6+7+8: model loading, BPE tokenizer, GPT-2 inference (Milestone ①)

2026-05-21 22:04:00 +08:00

09-kv-cache.md

phase 9: KV cache + autoregressive generation

2026-05-21 23:39:41 +08:00

10-qwen3.md

phase 10: Qwen3-8B support (Milestone ②)

2026-05-22 00:46:37 +08:00

11-paged-attention.md

phase 11: GPU-resident KV cache

2026-05-22 11:50:12 +08:00