forked from TASC/HLRS-OpenMP-GPU-2024
59 lines
1.4 KiB
C
59 lines
1.4 KiB
C
|
/*
|
||
|
|
* OpenMP lecture exercises
|
||
|
|
* Copyright (C) 2011 by Christian Terboven <terboven@rz.rwth-aachen.de>
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License as published by
|
||
|
|
* the Free Software Foundation; either version 2 of the License, or
|
||
|
|
* (at your option) any later version.
|
||
|
|
*
|
||
|
|
* This program is distributed in the hope that it will be useful,
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
* GNU General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU General Public License
|
||
|
|
* along with this program; if not, write to the Free Software
|
||
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
#include <omp.h>
|
||
|
|
#include <math.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
|
||
|
|
|
||
|
|
double do_some_computation(int i)
|
||
|
|
{
|
||
|
|
double t = 0.0;
|
||
|
|
int j;
|
||
|
|
for (j = 0; j < i*i; j++)
|
||
|
|
{
|
||
|
|
t += sin((double)j) * cos((double)j);
|
||
|
|
}
|
||
|
|
return t;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
int main(int argc, char* argv[])
|
||
|
|
{
|
||
|
|
const int dimension = 500;
|
||
|
|
int i;
|
||
|
|
double result = 0.0;
|
||
|
|
|
||
|
|
double t1 = omp_get_wtime();
|
||
|
|
|
||
|
|
for (i = 0; i < dimension; i++)
|
||
|
|
{
|
||
|
|
result += do_some_computation(i);
|
||
|
|
}
|
||
|
|
|
||
|
|
double t2 = omp_get_wtime();
|
||
|
|
printf("Computation took %.3lf seconds.\n", t2 - t1);
|
||
|
|
printf("Result is %.3lf.\n", result);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|