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Copy pathomp.cpp
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48 lines (38 loc) · 1.18 KB
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#include "matrix_multiplication.hpp"
#include <omp.h>
// matrix_multiplication_omp
// reference: https://computing.llnl.gov/tutorials/openMP/samples/C/omp_mm.c
void matrix_multiplication_omp(unsigned nthreads) {
omp_set_num_threads(nthreads);
int i, j, k;
#pragma omp parallel shared(a, b, c, nthreads) private(i, j, k)
{
#pragma omp for schedule (static)
for (i=0; i<N; i++)
for (j=0; j<N; j++)
a[i][j]= i+j;
#pragma omp for schedule (static)
for (i=0; i<N; i++)
for (j=0; j<N; j++)
b[i][j]= i*j;
#pragma omp for schedule (static)
for (i=0; i<N; i++)
for (j=0; j<N; j++)
c[i][j]= 0;
#pragma omp for schedule (static)
for (i=0; i<N; i++) {
for(j=0; j<N; j++) {
for (k=0; k<N; k++) {
c[i][j] += a[i][k] * b[k][j];
}
}
}
}
//std::cout << reduce_sum() << std::endl;
}
std::chrono::microseconds measure_time_omp(unsigned num_threads) {
auto beg = std::chrono::high_resolution_clock::now();
matrix_multiplication_omp(num_threads);
auto end = std::chrono::high_resolution_clock::now();
return std::chrono::duration_cast<std::chrono::microseconds>(end - beg);
}