/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/*
* (C) 2001 by Argonne National Laboratory.
* See COPYRIGHT in top-level directory.
*/
#include "mpi.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define SIZE (65536)
/* Checks if the status objects is filled correctly by I/O functions */
static void handle_error(int errcode, const char *str)
{
char msg[MPI_MAX_ERROR_STRING];
int resultlen;
MPI_Error_string(errcode, msg, &resultlen);
fprintf(stderr, "%s: %s\n", str, msg);
MPI_Abort(MPI_COMM_WORLD, 1);
}
#define MPI_CHECK(fn) { int errcode; errcode = (fn); if (errcode != MPI_SUCCESS) handle_error(errcode, #fn); }
int main(int argc, char **argv)
{
int *buf, i, rank, nints, len, count, elements;
char *filename, *tmp;
int errs = 0, toterrs;
MPI_File fh;
MPI_Status status;
MPI_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
/* process 0 takes the file name as a command-line argument and
broadcasts it to other processes */
if (!rank) {
i = 1;
while ((i < argc) && strcmp("-fname", *argv)) {
i++;
argv++;
}
if (i >= argc) {
fprintf(stderr, "\n*# Usage: simple -fname filename\n\n");
MPI_Abort(MPI_COMM_WORLD, 1);
}
argv++;
len = strlen(*argv);
filename = (char *) malloc(len + 10);
strcpy(filename, *argv);
MPI_Bcast(&len, 1, MPI_INT, 0, MPI_COMM_WORLD);
MPI_Bcast(filename, len + 10, MPI_CHAR, 0, MPI_COMM_WORLD);
} else {
MPI_Bcast(&len, 1, MPI_INT, 0, MPI_COMM_WORLD);
filename = (char *) malloc(len + 10);
MPI_Bcast(filename, len + 10, MPI_CHAR, 0, MPI_COMM_WORLD);
}
buf = (int *) malloc(SIZE);
nints = SIZE / sizeof(int);
/* each process opens a separate file called filename.'myrank' */
tmp = (char *) malloc(len + 10);
strcpy(tmp, filename);
sprintf(filename, "%s.%d", tmp, rank);
MPI_CHECK(MPI_File_open(MPI_COMM_SELF, filename,
MPI_MODE_CREATE | MPI_MODE_RDWR, MPI_INFO_NULL, &fh));
MPI_CHECK(MPI_File_write(fh, buf, nints, MPI_INT, &status));
MPI_Get_count(&status, MPI_INT, &count);
MPI_Get_elements(&status, MPI_INT, &elements);
if (!rank) {
if (count != nints) {
errs++;
printf("count = %d, should be %d\n", count, nints);
}
if (elements != nints) {
errs++;
printf("elements = %d, should be %d\n", elements, nints);
}
}
MPI_CHECK(MPI_File_close(&fh));
MPI_Allreduce(&errs, &toterrs, 1, MPI_INT, MPI_SUM, MPI_COMM_WORLD);
if (rank == 0) {
if (toterrs > 0) {
fprintf(stderr, "Found %d errors\n", toterrs);
} else {
fprintf(stdout, " No Errors\n");
}
}
free(buf);
free(filename);
free(tmp);
MPI_Finalize();
return 0;
}