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/*
* Copyright (C) by Argonne National Laboratory
* See COPYRIGHT in top-level directory
*/
#include "mpi.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define COUNT (200)
#undef TIMING
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);
}
/* tests shared file pointer functions */
int main(int argc, char **argv)
{
int *buf, i, rank, nprocs, len, sum;
int 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);
double wr_stime, wr_etime, wr_time, wr_sumtime;
double rd_stime, rd_etime, rd_time, rd_sumtime;
/* 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");
}
wr_stime = MPI_Wtime();
errcode = MPI_File_write_ordered(fh, buf, COUNT, MPI_INT, &status);
if (errcode != MPI_SUCCESS) {
handle_error(errcode, "MPI_File_write_shared");
}
wr_etime = MPI_Wtime();
for (i = 0; i < COUNT; i++)
buf[i] = 0;
MPI_Barrier(MPI_COMM_WORLD);
rd_stime = MPI_Wtime();
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_ordered(fh, buf, COUNT, MPI_INT, &status);
if (errcode != MPI_SUCCESS) {
handle_error(errcode, "MPI_File_read_shared");
}
rd_etime = MPI_Wtime();
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);
wr_time = wr_etime - wr_stime;
rd_time = rd_etime - rd_stime;
MPI_Allreduce(&wr_time, &wr_sumtime, 1, MPI_DOUBLE, MPI_SUM, MPI_COMM_WORLD);
MPI_Allreduce(&rd_time, &rd_sumtime, 1, MPI_DOUBLE, 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");
#ifdef TIMING
fprintf(stderr, "nprocs: %d bytes: %d write: %f read %f\n",
nprocs, COUNT * sizeof(int), wr_sumtime, rd_sumtime);
#endif
}
}
MPI_Finalize();
return 0;
}
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