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add performance-portable tuning for register-tile and subgroup matmul (#22241)

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This commit is contained in:
Rithik Sharma
2026-04-26 09:26:28 -07:00
committed by GitHub
parent 78433f606f
commit 06a811d085
1 changed files with 28 additions and 8 deletions
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ggml/src/ggml-webgpu/ggml-webgpu-shader-lib.hpp
+28 -8
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@@ -26,20 +26,23 @@
// Matrix multiplication parameters
// Register tiling parameters
#define WEBGPU_MUL_MAT_TILE_M 8
#define WEBGPU_MUL_MAT_TILE_N 8
#define WEBGPU_MUL_MAT_TILE_M 4
#define WEBGPU_MUL_MAT_TILE_N 4
#define WEBGPU_MUL_MAT_WG_SIZE_M 8
#define WEBGPU_MUL_MAT_WG_SIZE_N 8
#define WEBGPU_MUL_MAT_TILE_K 32
#define WEBGPU_MUL_MAT_REG_TILE_K_FLOAT 8
#define WEBGPU_MUL_MAT_REG_TILE_K_QUANT 32
// Subgroup matrix parameters
// The number of subgroups in the M dimension
#define WEBGPU_MUL_MAT_SUBGROUP_M 2
// The number of subgroups in the N dimension
#define WEBGPU_MUL_MAT_SUBGROUP_N 2
#define WEBGPU_MUL_MAT_SUBGROUP_N 4
// The number of subgroup matrices each subgroup accumulates over
#define WEBGPU_MUL_MAT_SUBGROUP_MATRIX_M 4
#define WEBGPU_MUL_MAT_SUBGROUP_MATRIX_N 2
#define WEBGPU_MUL_MAT_SUBGROUP_TILE_K_FLOAT 32
#define WEBGPU_MUL_MAT_SUBGROUP_TILE_K_QUANT 32
// Matrix-vector multiplication parameters
#define WEBGPU_MUL_MAT_VEC_WG_SIZE 256
@@ -1734,13 +1737,24 @@ class ggml_webgpu_shader_lib {
// VEC/SCALAR controls
defines.push_back(key.vectorized ? "VEC" : "SCALAR");
const bool is_quant = ggml_is_quantized(context.src0->type);
uint32_t tile_k;
if (key.use_subgroup_matrix) {
tile_k = is_quant ? WEBGPU_MUL_MAT_SUBGROUP_TILE_K_QUANT
: WEBGPU_MUL_MAT_SUBGROUP_TILE_K_FLOAT;
} else {
tile_k = is_quant ? WEBGPU_MUL_MAT_REG_TILE_K_QUANT
: WEBGPU_MUL_MAT_REG_TILE_K_FLOAT;
}
// Tiles
defines.push_back("TILE_M=" + std::to_string(WEBGPU_MUL_MAT_TILE_M) + "u");
defines.push_back("TILE_N=" + std::to_string(WEBGPU_MUL_MAT_TILE_N) + "u");
defines.push_back("TILE_K=" + std::to_string(WEBGPU_MUL_MAT_TILE_K) + "u");
// Subgroup matrix specifics
if (key.use_subgroup_matrix) {
defines.push_back("TILE_K=" + std::to_string(tile_k) + "u");
defines.push_back("MAX_SUBGROUP_SIZE=" + std::to_string(context.max_subgroup_size) + "u");
defines.push_back("SUBGROUP_M=" + std::to_string(WEBGPU_MUL_MAT_SUBGROUP_M) + "u");
defines.push_back("SUBGROUP_N=" + std::to_string(WEBGPU_MUL_MAT_SUBGROUP_N) + "u");
@@ -1760,12 +1774,13 @@ class ggml_webgpu_shader_lib {
if (!key.use_subgroup_matrix) {
defines.push_back("WORKGROUP_SIZE_M=" + std::to_string(WEBGPU_MUL_MAT_WG_SIZE_M) + "u");
defines.push_back("WORKGROUP_SIZE_N=" + std::to_string(WEBGPU_MUL_MAT_WG_SIZE_N) + "u");
defines.push_back("TILE_K=" + std::to_string(tile_k) + "u");
}
auto processed = preprocessor.preprocess(shader_src, defines);
auto decisions = std::make_shared<ggml_webgpu_mul_mat_shader_decisions>();
decisions->tile_k = WEBGPU_MUL_MAT_TILE_K;
decisions->tile_k = tile_k;
decisions->tile_m = WEBGPU_MUL_MAT_TILE_M;
decisions->tile_n = WEBGPU_MUL_MAT_TILE_N;
decisions->use_subgroup_matrix = key.use_subgroup_matrix;
@@ -1962,10 +1977,15 @@ class ggml_webgpu_shader_lib {
defines.push_back("SCALAR");
// mul_mat_id is register-tile only.
const uint32_t tile_k = ggml_is_quantized(context.src0->type)
? WEBGPU_MUL_MAT_REG_TILE_K_QUANT
: WEBGPU_MUL_MAT_REG_TILE_K_FLOAT;
// Tiles
defines.push_back("TILE_M=" + std::to_string(WEBGPU_MUL_MAT_TILE_M) + "u");
defines.push_back("TILE_N=" + std::to_string(WEBGPU_MUL_MAT_TILE_N) + "u");
defines.push_back("TILE_K=" + std::to_string(WEBGPU_MUL_MAT_TILE_K) + "u");
defines.push_back("TILE_K=" + std::to_string(tile_k) + "u");
defines.push_back("WORKGROUP_SIZE_M=" + std::to_string(WEBGPU_MUL_MAT_WG_SIZE_M) + "u");
defines.push_back("WORKGROUP_SIZE_N=" + std::to_string(WEBGPU_MUL_MAT_WG_SIZE_N) + "u");
@@ -1976,7 +1996,7 @@ class ggml_webgpu_shader_lib {
auto processed = preprocessor.preprocess(wgsl_mul_mat_id, defines);
auto decisions = std::make_shared<ggml_webgpu_mul_mat_shader_decisions>();
decisions->tile_k = WEBGPU_MUL_MAT_TILE_K;
decisions->tile_k = tile_k;
decisions->tile_m = WEBGPU_MUL_MAT_TILE_M;
decisions->tile_n = WEBGPU_MUL_MAT_TILE_N;
decisions->wg_size_m = WEBGPU_MUL_MAT_WG_SIZE_M;