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double good_openmp_cache_opt(int ** matrix, long int size, int blocksize){
double total_begin = omp_get_wtime();
#pragma omp parallel for
for(int x = 0; x < size; x++){
for(int y = 0; y < size; y++){
matrix[x][y] = matrix[x][y] * 2;
double total_end = omp_get_wtime();
return double(total_end - total_begin);
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