GFX1100-TG200: small-N GEMV geometry levers (VT_GEMV_WARPS, VT_GEMV_SPLITK) — closed negative
Nobody has claimed this yet.
- Dominant language
- C++
- Stars
- 423
- Forks
- 53
- Avg merge
- 20h 26m
- Merged PRs (30d)
- 310
Description
Row: GFX1100-TG200
Summary
Small-N GEMV geometry levers: sweep warp count (VT_GEMV_WARPS) and split-K (VT_GEMV_SPLITK) for decode GEMV shapes. Closed negative in the original campaign — warps/split-K win warm benches but wash in the engine.
Benchmark
A/B interleaved, 5 pairs, Qwen3.5-4B Q4_K_M, 256 tokens, temp 0, seed 0:
| A (T25 chain) | B (T25+T37) | Delta | |
|---|---|---|---|
| Median | 32.40 | 32.38 | -0.09% |
Noise — confirms the original campaign's negative disposition.
Token identity
PASS — identical output to T25 chain.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Review the small-N GEMV benchmark campaign for the VT_GEMV_WARPS and VT_GEMV_SPLITK levers on GFX1100-TG200. Compare warm-benchmark results with engine-level measurements and verify token identity; the work is done only if a geometry setting produces a repeatable engine improvement, since the reported campaign was negative.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp
- Domain
- performance
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Active
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100