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

DEFINITIONS

1. handle_error
2. 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 COUNT (200)
  12 #undef TIMING
  13 
  14 void handle_error(int errcode, const char *str);
  15 
  16 void handle_error(int errcode, const char *str) 
  17 {
  18         char msg[MPI_MAX_ERROR_STRING];
  19         int resultlen;
  20         MPI_Error_string(errcode, msg, &resultlen);
  21         fprintf(stderr, "%s: %s\n", str, msg);
  22         MPI_Abort(MPI_COMM_WORLD, 1);
  23 }
  24 
  25 /* tests shared file pointer functions */
  26 
  27 int main(int argc, char **argv)
  28 {
  29     int *buf, i, rank, nprocs, len, sum;
  30     int global_sum;
  31     int errs=0, toterrs, errcode;
  32     char *filename;
  33     MPI_File fh;
  34     MPI_Status status;
  35 
  36     MPI_Init(&argc,&argv);
  37     MPI_Comm_rank(MPI_COMM_WORLD, &rank);
  38 
  39     double wr_stime, wr_etime, wr_time, wr_sumtime;
  40     double rd_stime, rd_etime, rd_time, rd_sumtime;
  41 
  42 /* process 0 takes the file name as a command-line argument and 
  43    broadcasts it to other processes */
  44     if (!rank) {
  45         i = 1;
  46         while ((i < argc) && strcmp("-fname", *argv)) {
  47             i++;
  48             argv++;
  49         }
  50         if (i >= argc) {
  51             fprintf(stderr, "\n*#  Usage: shared_fp -fname filename\n\n");
  52             MPI_Abort(MPI_COMM_WORLD, 1);
  53         }
  54         argv++;
  55         len = strlen(*argv);
  56         filename = (char *) malloc(len+10);
  57         strcpy(filename, *argv);
  58         MPI_Bcast(&len, 1, MPI_INT, 0, MPI_COMM_WORLD);
  59         MPI_Bcast(filename, len+10, MPI_CHAR, 0, MPI_COMM_WORLD);
  60     }
  61     else {
  62         MPI_Bcast(&len, 1, MPI_INT, 0, MPI_COMM_WORLD);
  63         filename = (char *) malloc(len+10);
  64         MPI_Bcast(filename, len+10, MPI_CHAR, 0, MPI_COMM_WORLD);
  65     }
  66     
  67     buf = (int *) malloc(COUNT * sizeof(int));
  68 
  69     MPI_Comm_rank(MPI_COMM_WORLD, &rank);
  70     MPI_Comm_size(MPI_COMM_WORLD, &nprocs);
  71 
  72     for (i=0; i<COUNT; i++) buf[i] = COUNT*rank + i;
  73 
  74     errcode = MPI_File_open(MPI_COMM_WORLD, filename, 
  75                     MPI_MODE_CREATE | MPI_MODE_RDWR, MPI_INFO_NULL, &fh);
  76     if (errcode != MPI_SUCCESS) {
  77             handle_error(errcode, "MPI_File_open");
  78     }
  79 
  80     wr_stime = MPI_Wtime();
  81 
  82     errcode = MPI_File_write_ordered(fh, buf, COUNT, MPI_INT, &status);
  83     if (errcode != MPI_SUCCESS) {
  84             handle_error(errcode, "MPI_File_write_shared");
  85     }
  86     wr_etime = MPI_Wtime();
  87 
  88     for (i=0; i<COUNT; i++) buf[i] = 0;
  89 
  90     MPI_Barrier(MPI_COMM_WORLD);
  91 
  92     rd_stime = MPI_Wtime();
  93     errcode = MPI_File_seek_shared(fh, 0, MPI_SEEK_SET);
  94     if (errcode != MPI_SUCCESS) {
  95             handle_error(errcode, "MPI_File_seek_shared");
  96     }
  97 
  98     errcode = MPI_File_read_ordered(fh, buf, COUNT, MPI_INT, &status);
  99     if (errcode != MPI_SUCCESS) {
 100             handle_error(errcode, "MPI_File_read_shared");
 101     }
 102 
 103     rd_etime = MPI_Wtime();
 104     MPI_File_close(&fh);
 105 
 106     sum = 0;
 107     for (i=0; i<COUNT; i++) sum += buf[i];
 108 
 109     MPI_Allreduce(&sum, &global_sum, 1, MPI_INT, MPI_SUM, MPI_COMM_WORLD);
 110 
 111     wr_time = wr_etime - wr_stime;
 112     rd_time = rd_etime - rd_stime;
 113 
 114     MPI_Allreduce(&wr_time, &wr_sumtime, 1, 
 115         MPI_DOUBLE, MPI_SUM, MPI_COMM_WORLD);
 116     MPI_Allreduce(&rd_time, &rd_sumtime, 1, 
 117         MPI_DOUBLE, MPI_SUM, MPI_COMM_WORLD);
 118 
 119     if (global_sum != (((COUNT*nprocs - 1)*(COUNT*nprocs))/2)) {
 120         errs++;
 121         fprintf(stderr, "Error: sum %d, global_sum %d, %d\n", 
 122                 sum, global_sum,(((COUNT*nprocs - 1)*(COUNT*nprocs))/2));
 123     }
 124     
 125     free(buf);
 126     free(filename);
 127 
 128     MPI_Allreduce( &errs, &toterrs, 1, MPI_INT, MPI_SUM, MPI_COMM_WORLD );
 129     if (rank == 0) {
 130         if( toterrs > 0) {
 131             fprintf( stderr, "Found %d errors\n", toterrs );
 132         }
 133         else {
 134             fprintf( stdout, " No Errors\n" );
 135 #ifdef TIMING
 136             fprintf( stderr, "nprocs: %d bytes: %d write: %f read %f\n", 
 137                  nprocs, COUNT*sizeof(int), wr_sumtime, rd_sumtime);
 138 #endif
 139         }
 140     }
 141 
 142     MPI_Finalize();
 143     return 0; 
 144 }