root/ompi/mca/io/romio321/romio/test/psimple.c

DEFINITIONS

1. main

   1 /* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
   2 /*  
   3  *  (C) 2001 by Argonne National Laboratory.
   4  *      See COPYRIGHT in top-level directory.
   5  */
   6 #include "mpi.h"
   7 #include <stdio.h>
   8 #include <string.h>
   9 #include <stdlib.h>
  10 
  11 #define SIZE (65536)
  12 
  13 /* This is the same as simple.c, but uses the PMPI versions of all
  14    MPI functions in order to test the profiling interface. */
  15 
  16 /* Each process writes to separate files and reads them back. 
  17    The file name is taken as a command-line argument, and the process rank 
  18    is appended to it. */ 
  19 
  20 int main(int argc, char **argv)
  21 {
  22     int *buf, i, rank, nints, len;
  23     char *filename, *tmp;
  24     int errs=0, toterrs;
  25     MPI_File fh;
  26     MPI_Status status;
  27 
  28     PMPI_Init(&argc,&argv);
  29     PMPI_Comm_rank(MPI_COMM_WORLD, &rank);
  30 
  31 /* process 0 takes the file name as a command-line argument and 
  32    broadcasts it to other processes */
  33     if (!rank) {
  34         i = 1;
  35         while ((i < argc) && strcmp("-fname", *argv)) {
  36             i++;
  37             argv++;
  38         }
  39         if (i >= argc) {
  40             fprintf(stderr, "\n*#  Usage: simple -fname filename\n\n");
  41             PMPI_Abort(MPI_COMM_WORLD, 1);
  42         }
  43         argv++;
  44         len = strlen(*argv);
  45         filename = (char *) malloc(len+10);
  46         strcpy(filename, *argv);
  47         PMPI_Bcast(&len, 1, MPI_INT, 0, MPI_COMM_WORLD);
  48         PMPI_Bcast(filename, len+10, MPI_CHAR, 0, MPI_COMM_WORLD);
  49     }
  50     else {
  51         PMPI_Bcast(&len, 1, MPI_INT, 0, MPI_COMM_WORLD);
  52         filename = (char *) malloc(len+10);
  53         PMPI_Bcast(filename, len+10, MPI_CHAR, 0, MPI_COMM_WORLD);
  54     }
  55     
  56 
  57     buf = (int *) malloc(SIZE);
  58     nints = SIZE/sizeof(int);
  59     for (i=0; i<nints; i++) buf[i] = rank*100000 + i;
  60 
  61     /* each process opens a separate file called filename.'myrank' */
  62     tmp = (char *) malloc(len+10);
  63     strcpy(tmp, filename);
  64     sprintf(filename, "%s.%d", tmp, rank);
  65 
  66     PMPI_File_open(MPI_COMM_SELF, filename, MPI_MODE_CREATE | MPI_MODE_RDWR,
  67                    MPI_INFO_NULL, &fh);
  68     PMPI_File_write(fh, buf, nints, MPI_INT, &status);
  69     PMPI_File_close(&fh);
  70 
  71     /* reopen the file and read the data back */
  72 
  73     for (i=0; i<nints; i++) buf[i] = 0;
  74     PMPI_File_open(MPI_COMM_SELF, filename, MPI_MODE_CREATE | MPI_MODE_RDWR, 
  75                   MPI_INFO_NULL, &fh);
  76     PMPI_File_read(fh, buf, nints, MPI_INT, &status);
  77     PMPI_File_close(&fh);
  78 
  79     /* check if the data read is correct */
  80     for (i=0; i<nints; i++) {
  81         if (buf[i] != (rank*100000 + i)) {
  82             errs++;
  83             fprintf(stderr, "Process %d: error, read %d, should be %d\n", rank, buf[i], rank*100000+i);
  84         }
  85     }
  86 
  87     MPI_Allreduce( &errs, &toterrs, 1, MPI_INT, MPI_SUM, MPI_COMM_WORLD );
  88     if (rank == 0) {
  89         if( toterrs > 0) {
  90             fprintf( stderr, "Found %d errors\n", toterrs );
  91         }
  92         else {
  93             fprintf( stdout, " No Errors\n" );
  94         }
  95     }
  96 
  97     free(buf);
  98     free(filename);
  99     free(tmp);
 100 
 101     PMPI_Finalize();
 102     return 0; 
 103 }