188 lines
5.6 KiB
Plaintext
188 lines
5.6 KiB
Plaintext
#include "mat_mul.h"
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#include <cstdio>
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#include <cuda_runtime.h>
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#define TS 4
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#define WPT 8
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#define TILE_WIDTH 16
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#define RTS (TS/WPT)
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#define CUDA_CALL(f) \
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{ \
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cudaError_t err = (f); \
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if (err != cudaSuccess) { \
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fprintf(stderr, "CUDA error at [%s:%d] %d %s\n", __FILE__, __LINE__, \
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err, cudaGetErrorString(err)); \
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exit(1); \
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} \
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}
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#define MAX_NUM_GPU 4
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int num_devices = 0;
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__global__ void sgemm(float *A, float *B, float *C, int M, int N, int K) {
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__shared__ float ds_M[TILE_WIDTH][TILE_WIDTH];
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__shared__ float ds_N[TILE_WIDTH][TILE_WIDTH];
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int bx = blockIdx.x, by = blockIdx.y,
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tx = threadIdx.x, ty = threadIdx.y,
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Row = by * TILE_WIDTH + ty,
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Col = bx * TILE_WIDTH + tx;
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float Pvalue = 0;
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// float Pvalue[WPT];
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// for (int w=0; w<WPT; w++) {
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// acc[w] = 0.0f;
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// }
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int numARows=M;
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int numAColumns=K;
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int numBRows=K;
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int numBColumns=N;
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int numCRows=M;
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int numCColumns=N;
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const int numTiles = (K+TILE_WIDTH-1)/TILE_WIDTH;
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// printf("Row %d Col %d numCColumns %d M %d N %d K %d \n",Row,Col,numCColumns,M,N,K);
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// for (int t=0; t<numTiles; t++) {
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for (int m = 0; m < (numAColumns-1)/TILE_WIDTH+1; ++m) {
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if (Row < numARows && m*TILE_WIDTH+tx < numAColumns)
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ds_M[ty][tx] = A[Row*numAColumns + m*TILE_WIDTH+tx];
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else
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ds_M[ty][tx] = 0;
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if (Col < numBColumns && m*TILE_WIDTH+ty < numBRows)
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ds_N[ty][tx] = B[(m*TILE_WIDTH+ty)*numBColumns+Col];
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else
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ds_N[ty][tx] = 0;
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__syncthreads();
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for (int k = 0; k < TILE_WIDTH; ++k)
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Pvalue += ds_M[ty][k] * ds_N[k][tx];
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__syncthreads();
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// }// for (int t=0; t<numTiles; t++)
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}
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if (Row < numCRows && Col < numCColumns)
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C[Row*numCColumns+Col] = Pvalue;
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}
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// Array of device (GPU) pointers
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static float *a_d[MAX_NUM_GPU];
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static float *b_d[MAX_NUM_GPU];
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static float *c_d[MAX_NUM_GPU];
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static int M, N, K;
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static int Mbegin[MAX_NUM_GPU], Mend[MAX_NUM_GPU];
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void mat_mul(float *_A, float *_B, float *_C, int _M, int _N, int _K) {
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// Launch kernel on every GPU
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for (int i = 0; i < num_devices; i++) {
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//dim3 blockDim(1, 1, 1);
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//dim3 gridDim(Mend[i] - Mbegin[i], N, 1);
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// dim3 gridDim((_N-1)/TILE_WIDTH+1, (M-1)/TILE_WIDTH+1, 1);
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dim3 gridDim((_N-1)/TILE_WIDTH+1, ( Mend[i] - Mbegin[i]-1)/TILE_WIDTH+1, 1);
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// dim3 gridDim((Mend[i] - Mbegin[i])/TILE_WIDTH+1, (Mend[i] - Mbegin[i])/TILE_WIDTH+1, 1);
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dim3 blockDim(TILE_WIDTH, TILE_WIDTH, 1);
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//jung dim3 blockDim(TS/WPT, TS, 1);
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//jung dim3 gridDim(((Mend[i] - Mbegin[i]+TS-1)/TS), (N+TS-1)/TS, 1);
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// dim3 blockDim(TS/WPT, TS, 1);
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// dim3 gridDim(((Mend[i] - Mbegin[i]+TS-1)/TS), (N+TS-1)/TS, 1);
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CUDA_CALL( cudaSetDevice(i) );
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sgemm<<<gridDim, blockDim>>>(a_d[i], b_d[i], c_d[i], Mend[i] - Mbegin[i], N, K);
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//sgemm<<<gridDim, blockDim>>>(a_d[i], b_d[i], c_d[i], M_siz[i], N, K);
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}
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// DO NOT REMOVE; NEEDED FOR TIME MEASURE
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for (int i = 0; i < num_devices; i++) {
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CUDA_CALL( cudaSetDevice(i) );//jjlee
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CUDA_CALL( cudaDeviceSynchronize() );
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}
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}
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void mat_mul_init(float *A, float *B, float *C, int _M, int _N, int _K) {
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M = _M, N = _N, K = _K;
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CUDA_CALL( cudaGetDeviceCount(&num_devices) );
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// num_devices=2;
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printf("Using %d devices\n", num_devices);
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for (int i = 0; i < num_devices; i++) {
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cudaDeviceProp prop;
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CUDA_CALL( cudaGetDeviceProperties(&prop, i) );
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// Try printing more detailed information here
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printf("[GPU %d] %s\n", i, prop.name);
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}
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if (num_devices <= 0) {
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printf("No CUDA device found. Aborting\n");
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exit(1);
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}
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// Setup problem size for each GPU
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for (int i = 0; i < num_devices; i++) {
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Mbegin[i] = (M / num_devices) * i;
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Mend[i] = (M / num_devices) * (i + 1);
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// printf(" [%d] Mbegin %d Mend %d \n",i,Mbegin[i],Mend[i]);
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}
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Mend[num_devices - 1] = M;
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// Allocate device memory for each GPU
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for (int i = 0; i < num_devices; i++) {
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CUDA_CALL( cudaSetDevice(i) );
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CUDA_CALL( cudaMalloc(&a_d[i], (Mend[i] - Mbegin[i]) * K * sizeof(float)) );
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CUDA_CALL( cudaMalloc(&b_d[i], K * N * sizeof(float)) );
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CUDA_CALL( cudaMalloc(&c_d[i], (Mend[i] - Mbegin[i]) * N * sizeof(float)) );
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}
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// Upload A and B matrix to every GPU
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for (int i = 0; i < num_devices; i++) {
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CUDA_CALL( cudaSetDevice(i) );//jjlee
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CUDA_CALL( cudaMemcpy(a_d[i], A + Mbegin[i] * K,
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(Mend[i] - Mbegin[i]) * K * sizeof(float),
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cudaMemcpyHostToDevice) );
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CUDA_CALL( cudaMemcpy(b_d[i], B, K * N * sizeof(float), cudaMemcpyHostToDevice) );
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}
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// DO NOT REMOVE; NEEDED FOR TIME MEASURE
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for (int i = 0; i < num_devices; i++) {
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CUDA_CALL( cudaDeviceSynchronize() );
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}
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}
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void mat_mul_final(float *A, float *B, float *C, int M, int N, int K) {
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// Do any post-matmul cleanup work here.
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// Download C matrix from GPUs
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for (int i = 0; i < num_devices; i++) {
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CUDA_CALL( cudaSetDevice(i) );
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CUDA_CALL( cudaMemcpy(C + Mbegin[i] * N, c_d[i],
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(Mend[i] - Mbegin[i]) * N * sizeof(float),
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cudaMemcpyDeviceToHost) );
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}
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// DO NOT REMOVE; NEEDED FOR TIME MEASURE
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for (int i = 0; i < num_devices; i++) {
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CUDA_CALL( cudaDeviceSynchronize() );
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}
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}
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