root/ompi/mca/io/romio321/romio/test/coll_test.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 <stdlib.h>
   8 #include <string.h>
   9 #include <stdio.h>
  10 
  11 /* A 32^3 array. For other array sizes, change array_of_gsizes below. */
  12 
  13 /* Uses collective I/O. Writes a 3D block-distributed array to a file
  14    corresponding to the global array in row-major (C) order, reads it
  15    back, and checks that the data read is correct. */
  16 
  17 /* The file name is taken as a command-line argument. */
  18 
  19 /* Note that the file access pattern is noncontiguous. */
  20    
  21 void handle_error(int errcode, const char *str);
  22 
  23 void handle_error(int errcode, const char *str)
  24 {
  25         char msg[MPI_MAX_ERROR_STRING];
  26         int resultlen;
  27         MPI_Error_string(errcode, msg, &resultlen);
  28         fprintf(stderr, "%s: %s\n", str, msg);
  29         MPI_Abort(MPI_COMM_WORLD, 1);
  30 }
  31 
  32 int main(int argc, char **argv)
  33 {
  34     MPI_Datatype newtype;
  35     int i, ndims, array_of_gsizes[3], array_of_distribs[3];
  36     int order, nprocs, j, len;
  37     int array_of_dargs[3], array_of_psizes[3];
  38     int *readbuf, *writebuf, mynod, *tmpbuf, array_size;
  39     MPI_Count bufcount;
  40     char *filename;
  41     int errs=0, toterrs;
  42     MPI_File fh;
  43     MPI_Status status;
  44     MPI_Request request;
  45     MPI_Info info = MPI_INFO_NULL;
  46     int errcode;
  47 
  48     MPI_Init(&argc,&argv);
  49     MPI_Comm_rank(MPI_COMM_WORLD, &mynod);
  50     MPI_Comm_size(MPI_COMM_WORLD, &nprocs);
  51 
  52 /* process 0 takes the file name as a command-line argument and 
  53    broadcasts it to other processes */
  54     if (!mynod) {
  55         i = 1;
  56         while ((i < argc) && strcmp("-fname", *argv)) {
  57             i++;
  58             argv++;
  59         }
  60         if (i >= argc) {
  61             fprintf(stderr, "\n*#  Usage: coll_test -fname filename\n\n");
  62             MPI_Abort(MPI_COMM_WORLD, 1);
  63         }
  64         argv++;
  65         len = strlen(*argv);
  66         filename = (char *) malloc(len+1);
  67         strcpy(filename, *argv);
  68         MPI_Bcast(&len, 1, MPI_INT, 0, MPI_COMM_WORLD);
  69         MPI_Bcast(filename, len+1, MPI_CHAR, 0, MPI_COMM_WORLD);
  70     }
  71     else {
  72         MPI_Bcast(&len, 1, MPI_INT, 0, MPI_COMM_WORLD);
  73         filename = (char *) malloc(len+1);
  74         MPI_Bcast(filename, len+1, MPI_CHAR, 0, MPI_COMM_WORLD);
  75     }
  76 
  77 
  78 /* create the distributed array filetype */
  79     ndims = 3;
  80     order = MPI_ORDER_C;
  81 
  82     array_of_gsizes[0] = 32;
  83     array_of_gsizes[1] = 32;
  84     array_of_gsizes[2] = 32;
  85 
  86     array_of_distribs[0] = MPI_DISTRIBUTE_BLOCK;
  87     array_of_distribs[1] = MPI_DISTRIBUTE_BLOCK;
  88     array_of_distribs[2] = MPI_DISTRIBUTE_BLOCK;
  89 
  90     array_of_dargs[0] = MPI_DISTRIBUTE_DFLT_DARG;
  91     array_of_dargs[1] = MPI_DISTRIBUTE_DFLT_DARG;
  92     array_of_dargs[2] = MPI_DISTRIBUTE_DFLT_DARG;
  93 
  94     for (i=0; i<ndims; i++) array_of_psizes[i] = 0;
  95     MPI_Dims_create(nprocs, ndims, array_of_psizes);
  96 
  97     MPI_Type_create_darray(nprocs, mynod, ndims, array_of_gsizes, 
  98                            array_of_distribs, array_of_dargs,
  99                            array_of_psizes, order, MPI_INT, &newtype);
 100     MPI_Type_commit(&newtype);
 101 
 102 /* initialize writebuf */
 103 
 104     MPI_Type_size_x(newtype, &bufcount);
 105     bufcount = bufcount/sizeof(int);
 106     writebuf = (int *) malloc(bufcount * sizeof(int));
 107     for (i=0; i<bufcount; i++) writebuf[i] = 1;
 108 
 109     array_size = array_of_gsizes[0]*array_of_gsizes[1]*array_of_gsizes[2];
 110     tmpbuf = (int *) calloc(array_size, sizeof(int));
 111     MPI_Irecv(tmpbuf, 1, newtype, mynod, 10, MPI_COMM_WORLD, &request);
 112     MPI_Send(writebuf, bufcount, MPI_INT, mynod, 10, MPI_COMM_WORLD);
 113     MPI_Wait(&request, &status);
 114 
 115     j = 0;
 116     for (i=0; i<array_size; i++)
 117         if (tmpbuf[i]) {
 118             writebuf[j] = i;
 119             j++;
 120         }
 121     free(tmpbuf);
 122 
 123     if (j != bufcount) {
 124         fprintf(stderr, "Error in initializing writebuf on process %d\n", mynod);
 125         MPI_Abort(MPI_COMM_WORLD, 1);
 126     }
 127 /* end of initialization */
 128 
 129     /* write the array to the file */
 130     errcode = MPI_File_open(MPI_COMM_WORLD, filename, 
 131                     MPI_MODE_CREATE | MPI_MODE_RDWR, info, &fh);
 132     if (errcode != MPI_SUCCESS) handle_error(errcode, "MPI_File_open");
 133    
 134     errcode = MPI_File_set_view(fh, 0, MPI_INT, newtype, "native", info);
 135     if (errcode != MPI_SUCCESS) handle_error(errcode, "MPI_File_set_view");
 136 
 137     errcode = MPI_File_write_all(fh, writebuf, bufcount, MPI_INT, &status);
 138     if (errcode != MPI_SUCCESS) handle_error(errcode, "MPI_File_write_all");
 139     errcode = MPI_File_close(&fh);
 140     if (errcode != MPI_SUCCESS) handle_error(errcode, "MPI_File_close");
 141 
 142     if (!mynod) {
 143         /* wkl suggests potential for false " No Errors" if both read 
 144          * and write use the same file view */
 145         /* solution: rank 0 reads entire file and checks write values */
 146         errcode = MPI_File_open(MPI_COMM_SELF, filename, 
 147                         MPI_MODE_RDONLY, info, &fh);
 148         if (errcode != MPI_SUCCESS) handle_error(errcode, "MPI_File_open");
 149 
 150         readbuf = (int *) malloc(array_size * sizeof(int));
 151         errcode = MPI_File_read(fh, readbuf, array_size, MPI_INT, &status);
 152         if (errcode != MPI_SUCCESS) handle_error(errcode, "MPI_File_read");
 153 
 154         errcode = MPI_File_close(&fh);
 155         if (errcode != MPI_SUCCESS) handle_error(errcode, "MPI_File_close");
 156 
 157         for (i=0; i<array_size; i++)
 158             if (readbuf[i] != i) {
 159                 errs++;
 160                 fprintf(stderr, "Error: write integer %d but read %d\n", 
 161                                 i,readbuf[i]);
 162                 break;
 163             }
 164         free(readbuf);
 165     }
 166     MPI_Barrier(MPI_COMM_WORLD);
 167 
 168     /* now read it back */
 169     readbuf = (int *) malloc(bufcount * sizeof(int));
 170     errcode = MPI_File_open(MPI_COMM_WORLD, filename, 
 171                     MPI_MODE_CREATE | MPI_MODE_RDWR, info, &fh);
 172     if (errcode != MPI_SUCCESS) handle_error(errcode, "MPI_File_open");
 173 
 174     errcode = MPI_File_set_view(fh, 0, MPI_INT, newtype, "native", info);
 175     if (errcode != MPI_SUCCESS) handle_error(errcode, "MPI_File_set_view");
 176     errcode = MPI_File_read_all(fh, readbuf, bufcount, MPI_INT, &status);
 177     if (errcode != MPI_SUCCESS) handle_error(errcode, "MPI_File_read_all");
 178     errcode = MPI_File_close(&fh);
 179     if (errcode != MPI_SUCCESS) handle_error(errcode, "MPI_File_close");
 180 
 181     /* check the data read */
 182     for (i=0; i<bufcount; i++) {
 183         if (readbuf[i] != writebuf[i]) {
 184             errs++;
 185             fprintf(stderr, "Process %d, readbuf %d, writebuf %d, i %d\n", mynod, readbuf[i], writebuf[i], i);
 186         }
 187     }
 188 
 189     MPI_Allreduce( &errs, &toterrs, 1, MPI_INT, MPI_SUM, MPI_COMM_WORLD );
 190     if (mynod == 0) {
 191         if( toterrs > 0) {
 192             fprintf( stderr, "Found %d errors\n", toterrs );
 193         }
 194         else {
 195             fprintf( stdout, " No Errors\n" );
 196         }
 197     }
 198 
 199     MPI_Type_free(&newtype);
 200     free(readbuf);
 201     free(writebuf);
 202     free(filename);
 203 
 204     MPI_Finalize();
 205     return 0;
 206 }