GEMM n5120 k17408
129 eligible runs
gemm
General matrix multiply (GEMM) C = A @ B.T. Captured from Qwen3 14B down_proj (intermediate=17408 → hidden=5120).
Source baseline · unbeaten
41.2µsmean
flashinfer / wrapperdd130aFlashInfer-Bench baselines · Apache-2.0 · python
Reported evidence · last observed 2026-03-24. The source's designated baseline implementation. Reported by source; not independently reproduced.
Current records
Workloadm = 4 · fp1643 cases
m
dtype
scrolls · 43 cases total
Not measured on H100 for this workload. Challenges →
Source-native comparison · GPU NVIDIA B200 · Workload m = 4 · fp16 · CUDA 12.8 · Framework pytorch 2.9.1+cu128 · Protocol flashinfer-bench · mean · 3 results · last observed 2026-03-24Record history →
Estimated floor 22.3 µs · record 1.85× above itestimate, not evidence ›
DRAM 22.3 µs · compute 317 ns · bandwidth-bound on B200
every declared tensor crosses HBM exactly once (8,000 GB/s, B200 datasheet)
2·M·N·K with M=4, N=5120, K=17408 at the dense bf16 peak (2,250 TFLOP/s)
headroom-v1: a lower bound from declared tensors and datasheet peaks. A kernel can sit well above it for good reasons.
#
Implementation
Latency
vs #1
Trust
Observed
141.2µs1.00×Reported · Apache-2.0 · source2026-03-24stale
Measured exactly what you asked. The source's designated baseline implementation. Reported by source; not independently reproduced.
source mirroredApache-2.0no install recipeView source →Run detail →
242.1µs1.02×Reported · Apache-2.0 · source2026-03-23stale
Measured exactly what you asked. The source's designated baseline implementation. Reported by source; not independently reproduced.
source mirroredApache-2.0no install recipeView source →Run detail →
342.2µs1.02×Reported · Apache-2.0 · source2026-03-24stale
Measured exactly what you asked. The source's designated baseline implementation. Reported by source; not independently reproduced.
source mirroredApache-2.0no install recipeView source →Run detail →
Scaling by m
Implementations
Implementation
Runtime
Best latency
Evidence
Availability
Semantics
Inputs and outputs
afp16 [m, k]
bfp16 [n, k]
cfp16 [m, n]
Axes and behavior
kconstant = 17408
mvariable
nconstant = 5120
determinismunspecified
constraintsNo mutation or aliasing
Identity
Sources: FlashInfer-Bench (2026-03-24) · Apache-2.0last observed 2026-03-24How records are decidedJSON