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CUDA: Volta tensor core support for MMF (#16843)

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* CUDA: Volta tensor core support for MMF

* more generic checks for hardware support

* Update ggml/src/ggml-cuda/mmf.cuh

Co-authored-by: Aman Gupta <amangupta052@gmail.com>

---------

Co-authored-by: Aman Gupta <amangupta052@gmail.com>
This commit is contained in:
Johannes Gäßler
2025-10-31 15:57:19 +01:00
committed by GitHub
co-authored by Aman Gupta
parent 6d39015a74
commit 31c511a968
4 changed files with 254 additions and 36 deletions
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ggml/src/ggml-cuda/mmf.cuh
+31 -10
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@@ -28,9 +28,19 @@ static __global__ void mul_mat_f(
const int channel_ratio, const int stride_channel_x, const int stride_channel_y, const int stride_channel_dst,
const int sample_ratio, const int stride_sample_x, const int stride_sample_y, const int stride_sample_dst) {
#if !defined(GGML_USE_HIP) && !defined(GGML_USE_MUSA)
typedef tile<16, 8, T> tile_A;
typedef tile< 8, 8, T> tile_B;
typedef tile<16, 8, float> tile_C;
constexpr bool I_16_supported = tile<16, 8, T>::supported() && tile<16, 8, float>::supported();
constexpr bool I_32_supported = tile<32, 8, T>::supported() && tile<32, 8, float>::supported();
if (!I_16_supported && !I_32_supported) {
NO_DEVICE_CODE;
return;
}
constexpr int I_preferred = I_16_supported ? 16 : 32; // For Turing MMA both work but 16 is ~1% faster.
typedef tile<I_preferred, 8, T> tile_A;
typedef tile<8, 8, T> tile_B;
typedef tile<I_preferred, 8, float> tile_C;
constexpr int warp_size = ggml_cuda_get_physical_warp_size();
constexpr int tile_k_padded = warp_size + 4;
@@ -232,7 +242,6 @@ static __global__ void mul_mat_f(
#endif // !defined(GGML_USE_HIP) && !defined(GGML_USE_MUSA)
}
//This kernel is for larger batch sizes of mul_mat_id
template <typename T, int rows_per_block, int cols_per_block, int nwarps>
__launch_bounds__(ggml_cuda_get_physical_warp_size()*nwarps, 1)
@@ -245,9 +254,19 @@ static __global__ void mul_mat_f_ids(
const int sample_ratio, const int stride_sample_x, const int stride_sample_y, const int stride_sample_dst,
const uint3 sis1_fd, const uint3 nch_fd) {
#if !defined(GGML_USE_HIP) && !defined(GGML_USE_MUSA)
typedef tile<16, 8, T> tile_A;
typedef tile< 8, 8, T> tile_B;
typedef tile<16, 8, float> tile_C;
constexpr bool I_16_supported = tile<16, 8, T>::supported() && tile<16, 8, float>::supported();
constexpr bool I_32_supported = tile<32, 8, T>::supported() && tile<32, 8, float>::supported();
if (!I_16_supported && !I_32_supported) {
NO_DEVICE_CODE;
return;
}
constexpr int I_preferred = I_16_supported ? 16 : 32; // For Turing MMA both work butr 16 is ~1% faster.
typedef tile<I_preferred, 8, T> tile_A;
typedef tile<8, 8, T> tile_B;
typedef tile<I_preferred, 8, float> tile_C;
constexpr int warp_size = ggml_cuda_get_physical_warp_size();
constexpr int tile_k_padded = warp_size + 4;
@@ -533,7 +552,8 @@ void mul_mat_f_cuda(
const int64_t stride_channel_x, const int64_t stride_channel_y, const int64_t stride_channel_dst, const int64_t nsamples_x,
const int64_t nsamples_dst, const int64_t stride_sample_x, const int64_t stride_sample_y, const int64_t stride_sample_dst,
cudaStream_t stream, const mmf_ids_data * ids_data) {
typedef tile<16, 8, T> tile_A;
typedef tile<16, 8, T> tile_A_16;
typedef tile<32, 8, T> tile_A_32;
typedef tile< 8, 8, T> tile_B;
GGML_ASSERT(ncols_x % 2 == 0);
@@ -544,7 +564,8 @@ void mul_mat_f_cuda(
const int64_t channel_ratio = nchannels_dst / nchannels_x;
const int64_t sample_ratio = nsamples_dst / nsamples_x;
const int device = ggml_cuda_get_device();
const int device = ggml_cuda_get_device();
const int cc = ggml_cuda_info().devices[device].cc;
const int warp_size = ggml_cuda_info().devices[device].warp_size;
int64_t nwarps_best = 1;
@@ -559,7 +580,7 @@ void mul_mat_f_cuda(
}
constexpr int rows_per_block = MMF_ROWS_PER_BLOCK;
const int nbytes_shared_iter = nwarps_best * tile_A::I * (warp_size + 4) * 4;
const int nbytes_shared_iter = nwarps_best * (volta_mma_available(cc) ? tile_A_32::I : tile_A_16::I) * (warp_size + 4) * 4;
const int nbytes_shared_combine = GGML_PAD(cols_per_block, tile_B::I) * (nwarps_best*rows_per_block + 4) * 4;
const int nbytes_shared = std::max(nbytes_shared_iter, nbytes_shared_combine);
const int nbytes_slotmap = ids ? GGML_PAD(cols_per_block, 16) * sizeof(int) : 0;