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/* -*- 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 COUNT 1024
void handle_error(int errcode, const char *str);
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);
}
/* tests shared file pointer functions */
int main(int argc, char **argv)
{
int *buf, i, rank, nprocs, len, sum, global_sum;
int errs=0, toterrs, errcode;
char *filename;
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: shared_fp -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(COUNT * sizeof(int));
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Comm_size(MPI_COMM_WORLD, &nprocs);
for (i=0; i<COUNT; i++) buf[i] = COUNT*rank + i;
errcode = MPI_File_open(MPI_COMM_WORLD, filename,
MPI_MODE_CREATE | MPI_MODE_RDWR, MPI_INFO_NULL, &fh);
if (errcode != MPI_SUCCESS) {
handle_error(errcode, "MPI_File_open");
}
errcode = MPI_File_write_shared(fh, buf, COUNT, MPI_INT, &status);
if (errcode != MPI_SUCCESS) {
handle_error(errcode, "MPI_File_write_shared");
}
for (i=0; i<COUNT; i++) buf[i] = 0;
MPI_Barrier(MPI_COMM_WORLD);
errcode = MPI_File_seek_shared(fh, 0, MPI_SEEK_SET);
if (errcode != MPI_SUCCESS) {
handle_error(errcode, "MPI_File_seek_shared");
}
errcode = MPI_File_read_shared(fh, buf, COUNT, MPI_INT, &status);
if (errcode != MPI_SUCCESS) {
handle_error(errcode, "MPI_File_read_shared");
}
MPI_File_close(&fh);
sum = 0;
for (i=0; i<COUNT; i++) sum += buf[i];
MPI_Allreduce(&sum, &global_sum, 1, MPI_INT, MPI_SUM, MPI_COMM_WORLD);
if (global_sum != (((COUNT*nprocs - 1)*(COUNT*nprocs))/2)) {
errs++;
fprintf(stderr, "Error: sum %d, global_sum %d, %d\n",
sum, global_sum,(((COUNT*nprocs - 1)*(COUNT*nprocs))/2));
}
free(buf);
free(filename);
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" );
}
}
MPI_Finalize();
return 0;
}
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