45 lines
1.2 KiB
Plaintext
45 lines
1.2 KiB
Plaintext
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#pragma once
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#include <cuda_runtime.h>
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#include <cublas_v2.h>
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#include <stdio.h>
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#include <stdlib.h>
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template<const int BLOCK_SIZE>
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__global__ void mysgemm_v2(int M, int N, int K, float alpha, float *A, float *B, float beta, float *C) {
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int bx = blockIdx.x;
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int by = blockIdx.y;
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const int BM = BLOCK_SIZE;
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const int BN = BLOCK_SIZE;
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const int BK = BLOCK_SIZE;
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int tx = threadIdx.x % BN;
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int ty = threadIdx.x / BN;
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// 申请共享内存空间
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__shared__ float As[BM * BK];
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__shared__ float Bs[BK * BN];
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// 移动到当前block
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A = &A[by * BM * K];
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B = &B[bx * BN];
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C = &C[by * BM * N + bx * BN];
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float tmp = 0.;
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for (int k = 0; k < K; k += BK) {
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// 缓存A_tile和B_tile
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As[ty * BK + tx] = A[ty * K + tx];
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Bs[ty * BN + tx] = B[ty * N + tx];
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// 同步所有线程缓存完成
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__syncthreads();
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A += BK;
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B += BK * N;
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for (int i = 0; i < BK; i++) {
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tmp += As[ty * BK + i] * Bs[i * BN + tx];
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}
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// FMA计算需要读取缓存数据，在新一轮写入缓存前进行同步，确保所有线程计算完成
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__syncthreads();
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}
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C[ty * N + tx] = alpha * tmp + beta * C[ty * N + tx];
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}
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