85 строки
2.1 KiB
C
85 строки
2.1 KiB
C
/* -*- Mode: C; c-basic-offset:4 ; -*- */
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#include "mpi.h"
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#include "mpio.h" /* not necessary with MPICH 1.1.1 or HPMPI 1.4 */
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#define COUNT 1024
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/* tests shared file pointer functions */
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int main(int argc, char **argv)
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{
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int *buf, i, rank, nprocs, len, sum, global_sum;
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char *filename;
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MPI_File fh;
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MPI_Status status;
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MPI_Init(&argc,&argv);
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MPI_Comm_rank(MPI_COMM_WORLD, &rank);
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/* process 0 takes the file name as a command-line argument and
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broadcasts it to other processes */
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if (!rank) {
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i = 1;
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while ((i < argc) && strcmp("-fname", *argv)) {
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i++;
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argv++;
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}
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if (i >= argc) {
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fprintf(stderr, "\n*# Usage: simple -fname filename\n\n");
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MPI_Abort(MPI_COMM_WORLD, 1);
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}
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argv++;
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len = strlen(*argv);
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filename = (char *) malloc(len+10);
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strcpy(filename, *argv);
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MPI_Bcast(&len, 1, MPI_INT, 0, MPI_COMM_WORLD);
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MPI_Bcast(filename, len+10, MPI_CHAR, 0, MPI_COMM_WORLD);
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}
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else {
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MPI_Bcast(&len, 1, MPI_INT, 0, MPI_COMM_WORLD);
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filename = (char *) malloc(len+10);
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MPI_Bcast(filename, len+10, MPI_CHAR, 0, MPI_COMM_WORLD);
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}
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buf = (int *) malloc(COUNT * sizeof(int));
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MPI_Comm_rank(MPI_COMM_WORLD, &rank);
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MPI_Comm_size(MPI_COMM_WORLD, &nprocs);
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for (i=0; i<COUNT; i++) buf[i] = COUNT*rank + i;
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MPI_File_open(MPI_COMM_WORLD, filename, MPI_MODE_CREATE | MPI_MODE_RDWR,
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MPI_INFO_NULL, &fh);
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MPI_File_write_shared(fh, buf, COUNT, MPI_INT, &status);
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for (i=0; i<COUNT; i++) buf[i] = 0;
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MPI_Barrier(MPI_COMM_WORLD);
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MPI_File_seek_shared(fh, 0, MPI_SEEK_SET);
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MPI_File_read_shared(fh, buf, COUNT, MPI_INT, &status);
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MPI_File_close(&fh);
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sum = 0;
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for (i=0; i<COUNT; i++) sum += buf[i];
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MPI_Allreduce(&sum, &global_sum, 1, MPI_INT, MPI_SUM, MPI_COMM_WORLD);
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if (global_sum != (((COUNT*nprocs - 1)*(COUNT*nprocs))/2))
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fprintf(stderr, "Error: sum %d, global_sum %d, %d\n", sum, global_sum,(((COUNT*nprocs - 1)*(COUNT*nprocs))/2));
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free(buf);
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free(filename);
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if (!rank) fprintf(stderr, "Done\n");
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MPI_Finalize();
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return 0;
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}
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