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/* -*- c-file-style: "GNU" -*- */
/*
* Copyright (C) CNRS, INRIA, Université Bordeaux 1, Télécom SudParis
* See COPYING in top-level directory.
*/
#include "mpi.h"
#include <stdio.h>
#include <stdlib.h>
#define NUM_SPAWNS 2
/* 'Compute' for a fixed duration */
void compute(unsigned usec) {
double t1, t2;
t1 = MPI_Wtime();
do {
t2 = MPI_Wtime();
} while (((t2 - t1) * 1e6) < (double) usec);
}
int main(int argc, char *argv[]) {
int np = NUM_SPAWNS;
int errcodes[NUM_SPAWNS];
MPI_Comm parentcomm, intercomm;
MPI_Init(&argc, &argv);
MPI_Comm_get_parent(&parentcomm);
compute(100000);
if (parentcomm == MPI_COMM_NULL) {
MPI_Comm_spawn("./mpi_spawn", MPI_ARGV_NULL, np, MPI_INFO_NULL, 0,
MPI_COMM_WORLD, &intercomm, errcodes);
printf("I'm the parent.\n");
compute(1000000);
} else {
printf("I'm the spawned.\n");
}
fflush(stdout);
MPI_Finalize();
return 0;
}
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