/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/*
* (C) 2014 by Argonne National Laboratory.
* See COPYRIGHT in top-level directory.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <mpi.h>
#define MAXLEN 9
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);
}
enum {
INDEXED,
HINDEXED,
STRUCT
} testcases;
static int test_indexed_with_zeros(char *filename, int testcase)
{
int i, rank, np, buflen, num, err, nr_errors=0;
int nelms[MAXLEN], buf[MAXLEN], indices[MAXLEN], blocklen[MAXLEN];
MPI_File fh;
MPI_Status status;
MPI_Datatype filetype;
MPI_Datatype types[MAXLEN];
MPI_Aint addrs[MAXLEN];
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Comm_size(MPI_COMM_WORLD, &np);
/* set up the number of integers to write in each iteration */
for (i=0; i<MAXLEN; i++) nelms[i] = 0;
if (rank == 0) nelms[4]=nelms[5]=nelms[7]=1;
if (rank == 1) nelms[0]=nelms[1]=nelms[2]=nelms[3]=nelms[6]=nelms[8]=1;
/* pre-fill the file with integers -999 */
if (rank == 0) {
for (i=0; i<MAXLEN; i++) buf[i] = -999;
err =MPI_File_open(MPI_COMM_SELF, filename, MPI_MODE_CREATE|MPI_MODE_WRONLY,
MPI_INFO_NULL, &fh);
if (err != MPI_SUCCESS) handle_error(err, "MPI_File_open");
err = MPI_File_write(fh, buf, MAXLEN, MPI_INT, &status);
if (err != MPI_SUCCESS) handle_error(err, "MPI_File_write");
err = MPI_File_close(&fh);
if (err != MPI_SUCCESS) handle_error(err, "MPI_File_close");
}
MPI_Barrier(MPI_COMM_WORLD);
/* define a filetype with spurious leading zeros */
buflen = num = 0;
for (i=0; i<MAXLEN; i++) {
buflen += nelms[i];
indices[num] = i;
addrs[num] = i*sizeof(int);
blocklen[num] = nelms[i];
types[num] = MPI_INT;
num++;
}
switch (testcase) {
case INDEXED:
MPI_Type_indexed(num, blocklen, indices, MPI_INT, &filetype);
break;
case HINDEXED:
MPI_Type_hindexed(num, blocklen, addrs, MPI_INT, &filetype);
break;
case STRUCT:
MPI_Type_create_struct(num, blocklen, addrs, types, &filetype);
break;
default:
fprintf(stderr, "unknown testcase!\n");
return(-100);
}
MPI_Type_commit(&filetype);
/* initialize write buffer and write to file*/
for (i=0; i<MAXLEN; i++) buf[i] = 1;
err =MPI_File_open(MPI_COMM_WORLD, filename, MPI_MODE_WRONLY, MPI_INFO_NULL, &fh);
if (err != MPI_SUCCESS) handle_error(err, "MPI_File_open");
err = MPI_File_set_view(fh, 0, MPI_INT, filetype, "native", MPI_INFO_NULL);
if (err != MPI_SUCCESS) handle_error(err, "MPI_File_set_view");
err = MPI_File_write_all(fh, buf, buflen, MPI_INT, &status);
if (err != MPI_SUCCESS) handle_error(err, "MPI_File_write_all");
MPI_Type_free(&filetype);
err = MPI_File_close(&fh);
if (err != MPI_SUCCESS) handle_error(err, "MPI_File_close");
/* read back and check */
if (rank == 0) {
err = MPI_File_open(MPI_COMM_SELF, filename, MPI_MODE_RDONLY, MPI_INFO_NULL, &fh);
if (err != MPI_SUCCESS) handle_error(err, "MPI_File_open");
err = MPI_File_read(fh,buf, MAXLEN, MPI_INT, &status);
if (err != MPI_SUCCESS) handle_error(err, "MPI_File_read");
err = MPI_File_close(&fh);
if (err != MPI_SUCCESS) handle_error(err, "MPI_File_close");
for (i=0; i<MAXLEN; i++) {
if (buf[i] < 0) {
nr_errors++;
printf("Error: unexpected value for case %d at buf[%d] == %d\n",
testcase,i,buf[i]);
}
}
}
return nr_errors;
}
int main(int argc, char **argv)
{
int nr_errors, rank, np;
MPI_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Comm_size(MPI_COMM_WORLD, &np);
if (np != 2) {
if (rank == 0) fprintf(stderr,"Must run on 2 MPI processes\n");
MPI_Finalize(); return 1;
}
nr_errors = test_indexed_with_zeros(argv[1], INDEXED);
nr_errors += test_indexed_with_zeros(argv[1], HINDEXED);
nr_errors += test_indexed_with_zeros(argv[1], STRUCT);
if (rank == 0 && nr_errors == 0) printf(" No Errors\n");
MPI_Finalize();
return 0;
}