38 строки
728 B
C
38 строки
728 B
C
#include <mpi.h>
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#include <stdio.h>
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#include <stdlib.h>
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int main(int argc, char *argv[])
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{
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long count = 0;
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int i = 8, j;
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int self;
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int do_barrier = 0;
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int k;
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double pi;
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if (getenv("DO_BARRIER")) {
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do_barrier = 1;
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}
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MPI_Init(&argc, &argv);
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MPI_Comm_rank(MPI_COMM_WORLD, &self);
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while (1) {
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#if 0
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for (k=0; k < (7-self)*1000; k++) {
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pi = 3.14159 * 18.0 / 35.3;
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}
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#endif
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MPI_Reduce(&i, &j, 1, MPI_INT, MPI_SUM, 0, MPI_COMM_WORLD);
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if (do_barrier) {
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MPI_Barrier(MPI_COMM_WORLD);
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}
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if (0 == (++count % 10000)) {
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fprintf(stderr, "%d still going at %ld\n", self, count);
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}
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}
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MPI_Finalize();
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return 0;
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}
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