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/*
* Copyright (C) by Argonne National Laboratory
* See COPYRIGHT in top-level directory
*/
/* this deceptively simple test uncovered a bug in the way certain file systems
* dealt with tuning parameters. See
* https://github.com/open-mpi/ompi/issues/158 and
* http://trac.mpich.org/projects/mpich/ticket/2261
*
* originally uncovered in Darshan:
* http://lists.mcs.anl.gov/pipermail/darshan-users/2015-February/000256.html
*
* to really exercise the bug in simple_collective,
* we'd have to run on a Lustre or Panasas file system.
*
* I am surprised src/mpi/romio/test/create_excl.c did not uncover the bug
*/
#include "mpitest.h"
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <string.h>
#include <sys/time.h>
#include <mpi.h>
#include <errno.h>
#include <getopt.h>
static char *opt_file = NULL;
static int parse_args(int rank, int argc, char **argv);
static void usage(const char *prog);
static int test_write(char *file, int nprocs, int rank, MPI_Info info)
{
double stime, etime, wtime, w_elapsed, w_slowest, elapsed, slowest;
MPI_File fh;
int ret;
char buffer[700] = { 0 };
MPI_Status status;
int verbose = 0;
MPI_Barrier(MPI_COMM_WORLD);
stime = MPI_Wtime();
ret = MPI_File_open(MPI_COMM_WORLD, file,
MPI_MODE_CREATE | MPI_MODE_WRONLY | MPI_MODE_EXCL, info, &fh);
if (ret != 0) {
fprintf(stderr, "Error: failed to open %s\n", file);
return 1;
}
etime = MPI_Wtime();
ret = MPI_File_write_at_all(fh, rank * 700, buffer, 700, MPI_BYTE, &status);
if (ret != 0) {
fprintf(stderr, "Error: failed to write %s\n", file);
return 1;
}
wtime = MPI_Wtime();
MPI_File_close(&fh);
elapsed = etime - stime;
w_elapsed = wtime - etime;
MPI_Reduce(&elapsed, &slowest, 1, MPI_DOUBLE, MPI_MAX, 0, MPI_COMM_WORLD);
MPI_Reduce(&w_elapsed, &w_slowest, 1, MPI_DOUBLE, MPI_MAX, 0, MPI_COMM_WORLD);
if (rank == 0) {
unlink(file);
slowest *= 1000.0;
w_slowest *= 1000.0;
if (verbose == 1) {
printf("file: %s, nprocs: %d, open_time: %f ms, write_time: %f ms\n",
file, nprocs, slowest, w_slowest);
}
}
return 0;
}
int main(int argc, char **argv)
{
int rank = -1;
int nprocs;
char file[256];
MPI_Info info;
int nr_errors = 0;
MTest_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Comm_size(MPI_COMM_WORLD, &nprocs);
/* parse the command line arguments */
parse_args(rank, argc, argv);
sprintf(file, "%s", opt_file);
MPI_Info_create(&info);
nr_errors += test_write(file, nprocs, rank, info);
/* actual value does not matter. test only writes a small amount of data */
MPI_Info_set(info, "striping_factor", "50");
nr_errors += test_write(file, nprocs, rank, info);
MPI_Info_free(&info);
MTest_Finalize(nr_errors);
return MTestReturnValue(nr_errors);
}
static int parse_args(int rank, int argc, char **argv)
{
int c;
while ((c = getopt(argc, argv, "e")) != EOF) {
switch (c) {
case 'h':
if (rank == 0)
usage(argv[0]);
exit(0);
case '?': /* unknown */
if (rank == 0)
usage(argv[0]);
exit(1);
default:
break;
}
}
if (argc - optind != 1) {
if (rank == 0)
usage(argv[0]);
exit(1);
}
opt_file = strdup(argv[optind]);
assert(opt_file);
return (0);
}
static void usage(const char *prog)
{
printf("Usage: %s [<OPTIONS>...] <FILE NAME>\n", prog);
printf("\n<OPTIONS> is one or more of\n");
printf(" -h print this help\n");
}
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