C++ 用于循环并行化的OpenMp
我尝试用OpenMP并行化下面的代码C++ 用于循环并行化的OpenMp,c++,c,parallel-processing,openmp,parallel-for,C++,C,Parallel Processing,Openmp,Parallel For,我尝试用OpenMP并行化下面的代码 #pragma omp parallel for collapse(2) { for (int mNdx = 0; mNdx < M; ++mNdx) { for (int nNdx = mNdx; nNdx < N; ++nNdx) { for (int elemNdx = mNdx; elemNdx <= nNdx; ++elemNdx) {
#pragma omp parallel for collapse(2)
{
for (int mNdx = 0; mNdx < M; ++mNdx)
{
for (int nNdx = mNdx; nNdx < N; ++nNdx)
{
for (int elemNdx = mNdx; elemNdx <= nNdx; ++elemNdx)
{
result[mNdx * N + nNdx] += matrixOne[mNdx * N + elemNdx] * matrixTwo[elemNdx * N + nNdx];
}
}
}
}
用于折叠的pragma omp并行(2)
{
对于(int-mNdx=0;mNdx#include <omp.h>
#include <iostream>
void initMatrix(float* mat, const int M, const int N);
void initResMatrix(float* mat, const int M, const int N);
double matMulUpperTriangular_C(float* matrixOne, float* matrixTwo, float* result, const int M, const int N);
double matMulUpperTriangular_Omp(float* matrixOne, float* matrixTwo, float* result, const int M, const int N);
int main()
{
const int M = 2048, N = 2048;
float* matOne = (float*)malloc(M * N * sizeof(float));
float* matTwo = (float*)malloc(M * N * sizeof(float));
float* res = (float*)malloc(M * N * sizeof(float));
initMatrix(matOne, M, N);
initMatrix(matTwo, M, N);
initResMatrix(res, M, N);
double timeConsumption[2] = { 0.0, 0.0 };
timeConsumption[0] = matMulUpperTriangular_C(matOne, matTwo, res, M, N);
timeConsumption[1] = matMulUpperTriangular_Omp(matOne, matTwo, res, M, N);
std::cout << "Runtime C:\t\t" << timeConsumption[0] << "s" << std::endl;
std::cout << "Runtime Omp:\t\t" << timeConsumption[1] << "s";
std::cout << " | SpeedUp: " << timeConsumption[0] / timeConsumption[1] << std::endl;
system("PAUSE");
return 0;
}
void initMatrix(float* mat, const int M, const int N)
{
for (int mNdx = 0; mNdx < M; ++mNdx)
{
for (int nNdx = 0; nNdx < mNdx; ++nNdx)
{
mat[mNdx * N + nNdx] = 0;
}
for (int nNdx = mNdx; nNdx < N; ++nNdx)
{
mat[mNdx * N + nNdx] = ((mNdx + nNdx) % 5 + 1) * 0.1f;
}
}
}
void initResMatrix(float* mat, const int M, const int N)
{
for (int mNdx = 0; mNdx < M; ++mNdx)
{
for (int nNdx = 0; nNdx < N; ++nNdx)
{
mat[mNdx * N + nNdx] = 0.0f;
}
}
}
double matMulUpperTriangular_C(float* matrixOne, float* matrixTwo, float* result, const int M, const int N)
{
double startTime = omp_get_wtime();
for (int mNdx = 0; mNdx < M; ++mNdx)
{
for (int nNdx = mNdx; nNdx < N; ++nNdx)
{
for (int elemNdx = mNdx; elemNdx <= nNdx; ++elemNdx)
{
result[mNdx * N + nNdx] += matrixOne[mNdx * N + elemNdx] * matrixTwo[elemNdx * N + nNdx];
}
}
}
double endTime = omp_get_wtime();
return endTime - startTime;
}
double matMulUpperTriangular_Omp(float* matrixOne, float* matrixTwo, float* result, const int M, const int N)
{
double startTime = omp_get_wtime();
#pragma omp parallel for collapse(2)
{
for (int mNdx = 0; mNdx < M; ++mNdx)
{
for (int nNdx = mNdx; nNdx < N; ++nNdx)
{
for (int elemNdx = mNdx; elemNdx <= nNdx; ++elemNdx)
{
result[mNdx * N + nNdx] += matrixOne[mNdx * N + elemNdx] * matrixTwo[elemNdx * N + nNdx];
}
}
}
}
double endTime = omp_get_wtime();
return endTime - startTime;
}