wtime.c

来自「fortran并行计算包」· C语言 代码 · 共 28 行

/* -*- Mode: C; c-basic-offset:4 ; -*- */
/*
 *  (C) 2001 by Argonne National Laboratory.
 *      See COPYRIGHT in top-level directory.
 */
#include "mpi.h"
#include <stdio.h>
#include <unistd.h>

int main(int argc, char *argv[])
{
	int i;
	double dStart, dFinish, dDuration;

	MPI_Init(&argc, &argv);
	MPI_Comm_rank(MPI_COMM_WORLD, &i);

	dStart = MPI_Wtime();
	sleep(1);
	dFinish = MPI_Wtime();
	dDuration = dFinish - dStart;

	printf("start:%g\nfinish:%g\nduration:%g\n", dStart, dFinish, dDuration);

	MPI_Finalize();
	return 0;
}