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