aboutsummaryrefslogtreecommitdiff
path: root/ggml-cuda.cu
diff options
context:
space:
mode:
Diffstat (limited to 'ggml-cuda.cu')
-rw-r--r--ggml-cuda.cu110
1 files changed, 71 insertions, 39 deletions
diff --git a/ggml-cuda.cu b/ggml-cuda.cu
index 35d2e45..98170a3 100644
--- a/ggml-cuda.cu
+++ b/ggml-cuda.cu
@@ -83,9 +83,19 @@ typedef struct {
} block_q8_0;
static_assert(sizeof(block_q8_0) == sizeof(ggml_fp16_t) + QK8_0, "wrong q8_0 block size/padding");
+#define WARP_SIZE 32
+
#define CUDA_MUL_BLOCK_SIZE 256
+
#define CUDA_DEQUANTIZE_BLOCK_SIZE 256
-#define CUDA_DMMV_BLOCK_SIZE 32 // dmmv = dequantize_mul_mat_vec
+
+// dmmv = dequantize_mul_mat_vec
+#ifndef GGML_CUDA_DMMV_X
+#define GGML_CUDA_DMMV_X 32
+#endif
+#ifndef GGML_CUDA_DMMV_Y
+#define GGML_CUDA_DMMV_Y 1
+#endif
static __global__ void mul_f32(const float * x, const float * y, float * dst, const int kx, const int ky) {
const int i = blockDim.x*blockIdx.x + threadIdx.x;
@@ -200,41 +210,51 @@ static __global__ void dequantize_block(const void * vx, float * y, const int k)
dequantize_kernel(vx, ib, iqs, v0, v1);
}
-template <int block_size, int qk, int qr, dequantize_kernel_t dequantize_kernel>
+template <int qk, int qr, dequantize_kernel_t dequantize_kernel>
static __global__ void dequantize_mul_mat_vec(const void * vx, const float * y, float * dst, const int ncols) {
- const int row = blockIdx.x;
+ // qk = quantized weights per x block
+ // qr = number of quantized weights per data value in x block
+ const int row = blockIdx.x*blockDim.y + threadIdx.y;
const int tid = threadIdx.x;
+ const int iter_stride = 2*GGML_CUDA_DMMV_X;
+ const int vals_per_iter = iter_stride / WARP_SIZE; // num quantized vals per thread and i iter
const int y_offset = qr == 1 ? 1 : qk/2;
- __shared__ float tmp[block_size]; // separate sum for each thread
- tmp[tid] = 0;
+ float tmp = 0; // partial sum for thread in warp
- for (int i = 0; i < ncols/block_size; i += 2) {
- const int col = i*block_size + 2*tid;
- const int ib = (row*ncols + col)/qk; // block index
- const int iqs = (col%qk)/qr; // quant index
+ for (int i = 0; i < ncols; i += iter_stride) {
+ const int col = i + vals_per_iter*tid;
+ const int ib = (row*ncols + col)/qk; // x block index
+ const int iqs = (col%qk)/qr; // x quant index
const int iybs = col - col%qk; // y block start index
- // dequantize
- float v0, v1;
- dequantize_kernel(vx, ib, iqs, v0, v1);
+// processing >2 values per i iter is faster for fast GPUs
+#pragma unroll
+ for (int j = 0; j < vals_per_iter; j += 2) {
+ // process 2 vals per j iter
+
+ // dequantize
+ float v0, v1;
+ dequantize_kernel(vx, ib, iqs + j/qr, v0, v1);
+ // for qr = 2 the iqs needs to increase by 1 per j iter because 2 weights per data val
- // matrix multiplication
- tmp[tid] += v0 * y[iybs + iqs + 0];
- tmp[tid] += v1 * y[iybs + iqs + y_offset];
+ // matrix multiplication
+ tmp += v0 * y[iybs + iqs + j/qr + 0];
+ tmp += v1 * y[iybs + iqs + j/qr + y_offset];
+ // for qr = 2 the y index needs to increase by 1 per j iter because of y_offset = qk/2
+ }
}
// sum up partial sums and write back result
__syncthreads();
- for (int s=block_size/2; s>0; s>>=1) {
- if (tid < s) {
- tmp[tid] += tmp[tid + s];
- }
- __syncthreads();
+#pragma unroll
+ for (int mask = 16; mask > 0; mask >>= 1) {
+ tmp += __shfl_xor_sync(0xffffffff, tmp, mask, 32);
}
+
if (tid == 0) {
- dst[row] = tmp[0];
+ dst[row] = tmp;
}
}
@@ -269,33 +289,43 @@ static void dequantize_row_q8_0_cuda(const void * vx, float * y, const int k, cu
}
static void dequantize_mul_mat_vec_q4_0_cuda(const void * vx, const float * y, float * dst, const int ncols, const int nrows, cudaStream_t stream) {
- GGML_ASSERT(ncols % CUDA_DMMV_BLOCK_SIZE == 0);
- dequantize_mul_mat_vec<CUDA_DMMV_BLOCK_SIZE, QK4_0, QR4_0, dequantize_q4_0>
- <<<nrows, CUDA_DMMV_BLOCK_SIZE, 0, stream>>>(vx, y, dst, ncols);
+ GGML_ASSERT(ncols % GGML_CUDA_DMMV_X == 0);
+ GGML_ASSERT(nrows % GGML_CUDA_DMMV_Y == 0);
+ const dim3 block_dims(WARP_SIZE, GGML_CUDA_DMMV_Y, 1);
+ dequantize_mul_mat_vec<QK4_0, QR4_0, dequantize_q4_0>
+ <<<nrows/GGML_CUDA_DMMV_Y, block_dims, 0, stream>>>(vx, y, dst, ncols);
}
static void dequantize_mul_mat_vec_q4_1_cuda(const void * vx, const float * y, float * dst, const int ncols, const int nrows, cudaStream_t stream) {
- GGML_ASSERT(ncols % CUDA_DMMV_BLOCK_SIZE == 0);
- dequantize_mul_mat_vec<CUDA_DMMV_BLOCK_SIZE, QK4_1, QR4_1, dequantize_q4_1>
- <<<nrows, CUDA_DMMV_BLOCK_SIZE, 0, stream>>>(vx, y, dst, ncols);
+ GGML_ASSERT(ncols % GGML_CUDA_DMMV_X == 0);
+ GGML_ASSERT(nrows % GGML_CUDA_DMMV_Y == 0);
+ const dim3 block_dims(WARP_SIZE, GGML_CUDA_DMMV_Y, 1);
+ dequantize_mul_mat_vec<QK4_1, QR4_1, dequantize_q4_1>
+ <<<nrows/GGML_CUDA_DMMV_Y, block_dims, 0, stream>>>(vx, y, dst, ncols);
}
static void dequantize_mul_mat_vec_q5_0_cuda(const void * vx, const float * y, float * dst, const int ncols, const int nrows, cudaStream_t stream) {
- GGML_ASSERT(ncols % CUDA_DMMV_BLOCK_SIZE == 0);
- dequantize_mul_mat_vec<CUDA_DMMV_BLOCK_SIZE, QK5_0, QR5_0, dequantize_q5_0>
- <<<nrows, CUDA_DMMV_BLOCK_SIZE, 0, stream>>>(vx, y, dst, ncols);
+ GGML_ASSERT(ncols % GGML_CUDA_DMMV_X == 0);
+ GGML_ASSERT(nrows % GGML_CUDA_DMMV_Y == 0);
+ const dim3 block_dims(WARP_SIZE, GGML_CUDA_DMMV_Y, 1);
+ dequantize_mul_mat_vec<QK5_0, QR5_0, dequantize_q5_0>
+ <<<nrows/GGML_CUDA_DMMV_Y, block_dims, 0, stream>>>(vx, y, dst, ncols);
}
static void dequantize_mul_mat_vec_q5_1_cuda(const void * vx, const float * y, float * dst, const int ncols, const int nrows, cudaStream_t stream) {
- GGML_ASSERT(ncols % CUDA_DMMV_BLOCK_SIZE == 0);
- dequantize_mul_mat_vec<CUDA_DMMV_BLOCK_SIZE, QK5_1, QR5_1, dequantize_q5_1>
- <<<nrows, CUDA_DMMV_BLOCK_SIZE, 0, stream>>>(vx, y, dst, ncols);
+ GGML_ASSERT(ncols % GGML_CUDA_DMMV_X == 0);
+ GGML_ASSERT(nrows % GGML_CUDA_DMMV_Y == 0);
+ const dim3 block_dims(WARP_SIZE, GGML_CUDA_DMMV_Y, 1);
+ dequantize_mul_mat_vec<QK5_1, QR5_1, dequantize_q5_1>
+ <<<nrows/GGML_CUDA_DMMV_Y, block_dims, 0, stream>>>(vx, y, dst, ncols);
}
static void dequantize_mul_mat_vec_q8_0_cuda(const void * vx, const float * y, float * dst, const int ncols, const int nrows, cudaStream_t stream) {
- GGML_ASSERT(ncols % CUDA_DMMV_BLOCK_SIZE == 0);
- dequantize_mul_mat_vec<CUDA_DMMV_BLOCK_SIZE, QK8_0, QR8_0, dequantize_q8_0>
- <<<nrows, CUDA_DMMV_BLOCK_SIZE, 0, stream>>>(vx, y, dst, ncols);
+ GGML_ASSERT(ncols % GGML_CUDA_DMMV_X == 0);
+ GGML_ASSERT(nrows % GGML_CUDA_DMMV_Y == 0);
+ const dim3 block_dims(WARP_SIZE, GGML_CUDA_DMMV_Y, 1);
+ dequantize_mul_mat_vec<QK8_0, QR8_0, dequantize_q8_0>
+ <<<nrows/GGML_CUDA_DMMV_Y, block_dims, 0, stream>>>(vx, y, dst, ncols);
}
static void convert_fp16_to_fp32_cuda(const void * vx, float * y, const int k, cudaStream_t stream) {
@@ -304,9 +334,11 @@ static void convert_fp16_to_fp32_cuda(const void * vx, float * y, const int k, c
}
static void convert_mul_mat_vec_f16_cuda(const void * vx, const float * y, float * dst, const int ncols, const int nrows, cudaStream_t stream) {
- GGML_ASSERT(ncols % CUDA_DMMV_BLOCK_SIZE == 0);
- dequantize_mul_mat_vec<CUDA_DMMV_BLOCK_SIZE, 32, 1, convert_f16>
- <<<nrows, CUDA_DMMV_BLOCK_SIZE, 0, stream>>>(vx, y, dst, ncols);
+ GGML_ASSERT(ncols % GGML_CUDA_DMMV_X == 0);
+ GGML_ASSERT(nrows % GGML_CUDA_DMMV_Y == 0);
+ const dim3 block_dims(WARP_SIZE, GGML_CUDA_DMMV_Y, 1);
+ dequantize_mul_mat_vec<1, 1, convert_f16>
+ <<<nrows/GGML_CUDA_DMMV_Y, block_dims, 0, stream>>>(vx, y, dst, ncols);
}
static to_fp32_cuda_t ggml_get_to_fp32_cuda(ggml_type type) {
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-26 14:57:42 +0000