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CUDA: use mmvq for mul-mat-id for small batch sizes #18958

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Merged
am17an merged 4 commits into from
Feb 3, 2026
Merged

CUDA: use mmvq for mul-mat-id for small batch sizes #18958

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1c77ccf
CUDA: use mmvq for mul-mat-id for small batch sizes
am17an Jan 20, 2026
dff9128
add mmvq too
am17an Jan 21, 2026
378ab5f
Fix perf issue on ampere. Use mmvf mm-id only for non-nvidia GPUs
am17an Jan 23, 2026
72d939e
templatize multi_token_path
am17an Jan 31, 2026
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14 changes: 10 additions & 4 deletions ggml/src/ggml-cuda/ggml-cuda.cu
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Original file line number Diff line number Diff line change
Expand Up @@ -2279,13 +2279,19 @@ static void ggml_cuda_mul_mat_id(ggml_backend_cuda_context & ctx, ggml_tensor *
const int cc = ggml_cuda_info().devices[ggml_cuda_get_device()].cc;

if (src1->type == GGML_TYPE_F32 && dst->type == GGML_TYPE_F32) {
if (ne2 == 1) {
static_assert(MMVQ_MAX_BATCH_SIZE == MMVF_MAX_BATCH_SIZE);
if (ne2 <= MMVQ_MAX_BATCH_SIZE) {
if (ggml_is_quantized(src0->type)) {
ggml_cuda_mul_mat_vec_q(ctx, src0, src1, ids, dst);
if (ne2 <= 4) {
ggml_cuda_mul_mat_vec_q(ctx, src0, src1, ids, dst);
return;
}
} else {
ggml_cuda_mul_mat_vec_f(ctx, src0, src1, ids, dst);
if (GGML_CUDA_CC_IS_AMD(cc)) {
ggml_cuda_mul_mat_vec_f(ctx, src0, src1, ids, dst);
return;
}
}
return;
}

if (ggml_cuda_should_use_mmq(src0->type, cc, ne12, /*n_experts=*/ne02)) {
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