268 строки
7.4 KiB
C
268 строки
7.4 KiB
C
/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
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/*
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* (C) 2001 by Argonne National Laboratory.
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* See COPYRIGHT in top-level directory.
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*/
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#include "mpi.h"
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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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/* tests noncontiguous reads/writes using independent I/O */
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#define SIZE 5000
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#define VERBOSE 0
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int main(int argc, char **argv)
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{
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int *buf, i, mynod, nprocs, len, b[3];
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int errs=0, toterrs;
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MPI_Aint d[3];
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MPI_File fh;
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MPI_Status status;
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char *filename;
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MPI_Datatype typevec, newtype, t[3];
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MPI_Info info;
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MPI_Init(&argc,&argv);
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MPI_Comm_size(MPI_COMM_WORLD, &nprocs);
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MPI_Comm_rank(MPI_COMM_WORLD, &mynod);
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if (nprocs != 2) {
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fprintf(stderr, "Run this program on two processes\n");
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MPI_Abort(MPI_COMM_WORLD, 1);
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}
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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 (length first, then string) */
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if (!mynod) {
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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: noncontig -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+1);
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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+1, 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+1);
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MPI_Bcast(filename, len+1, MPI_CHAR, 0, MPI_COMM_WORLD);
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}
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buf = (int *) malloc(SIZE*sizeof(int));
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MPI_Type_vector(SIZE/2, 1, 2, MPI_INT, &typevec);
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/* create a struct type with explicitly set LB and UB; displacements
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* of typevec are such that the types for the two processes won't
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* overlap.
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*/
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b[0] = b[1] = b[2] = 1;
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d[0] = 0;
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d[1] = mynod*sizeof(int);
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d[2] = SIZE*sizeof(int);
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t[0] = MPI_LB;
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t[1] = typevec;
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t[2] = MPI_UB;
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/* keep the struct, ditch the vector */
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MPI_Type_struct(3, b, d, t, &newtype);
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MPI_Type_commit(&newtype);
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MPI_Type_free(&typevec);
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MPI_Info_create(&info);
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/* I am setting these info values for testing purposes only. It is
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better to use the default values in practice. */
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MPI_Info_set(info, "ind_rd_buffer_size", "1209");
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MPI_Info_set(info, "ind_wr_buffer_size", "1107");
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if (!mynod) {
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#if VERBOSE
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fprintf(stderr, "\ntesting noncontiguous in memory, noncontiguous in file using independent I/O\n");
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#endif
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MPI_File_delete(filename, MPI_INFO_NULL);
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}
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MPI_Barrier(MPI_COMM_WORLD);
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MPI_File_open(MPI_COMM_WORLD, filename, MPI_MODE_CREATE | MPI_MODE_RDWR,
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info, &fh);
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/* set the file view for each process -- now writes go into the non-
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* overlapping but interleaved region defined by the struct type up above
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*/
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MPI_File_set_view(fh, 0, MPI_INT, newtype, "native", info);
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/* fill our buffer with a pattern and write, using our type again */
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for (i=0; i<SIZE; i++) buf[i] = i + mynod*SIZE;
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MPI_File_write(fh, buf, 1, newtype, &status);
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MPI_Barrier(MPI_COMM_WORLD);
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/* fill the entire buffer with -1's. read back with type.
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* note that the result of this read should be that every other value
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* in the buffer is still -1, as defined by our type.
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*/
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for (i=0; i<SIZE; i++) buf[i] = -1;
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MPI_File_read_at(fh, 0, buf, 1, newtype, &status);
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/* check that all the values read are correct and also that we didn't
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* overwrite any of the -1 values that we shouldn't have.
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*/
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for (i=0; i<SIZE; i++) {
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if (!mynod) {
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if ((i%2) && (buf[i] != -1)) {
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errs++;
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fprintf(stderr, "Process %d: buf %d is %d, should be -1\n",
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mynod, i, buf[i]);
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}
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if (!(i%2) && (buf[i] != i)) {
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errs++;
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fprintf(stderr, "Process %d: buf %d is %d, should be %d\n",
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mynod, i, buf[i], i);
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}
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}
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else {
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if ((i%2) && (buf[i] != i + mynod*SIZE)) {
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errs++;
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fprintf(stderr, "Process %d: buf %d is %d, should be %d\n",
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mynod, i, buf[i], i + mynod*SIZE);
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}
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if (!(i%2) && (buf[i] != -1)) {
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errs++;
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fprintf(stderr, "Process %d: buf %d is %d, should be -1\n",
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mynod, i, buf[i]);
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}
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}
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}
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MPI_File_close(&fh);
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MPI_Barrier(MPI_COMM_WORLD);
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if (!mynod) {
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#if VERBOSE
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fprintf(stderr, "\ntesting noncontiguous in memory, contiguous in file using independent I/O\n");
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#endif
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MPI_File_delete(filename, MPI_INFO_NULL);
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}
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MPI_Barrier(MPI_COMM_WORLD);
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MPI_File_open(MPI_COMM_WORLD, filename, MPI_MODE_CREATE | MPI_MODE_RDWR,
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info, &fh);
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/* in this case we write to either the first half or the second half
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* of the file space, so the regions are not interleaved. this is done
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* by leaving the file view at its default.
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*/
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for (i=0; i<SIZE; i++) buf[i] = i + mynod*SIZE;
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MPI_File_write_at(fh, mynod*(SIZE/2)*sizeof(int), buf, 1, newtype, &status);
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MPI_Barrier(MPI_COMM_WORLD);
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/* same as before; fill buffer with -1's and then read; every other
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* value should still be -1 after the read
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*/
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for (i=0; i<SIZE; i++) buf[i] = -1;
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MPI_File_read_at(fh, mynod*(SIZE/2)*sizeof(int), buf, 1, newtype, &status);
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/* verify that the buffer looks like it should */
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for (i=0; i<SIZE; i++) {
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if (!mynod) {
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if ((i%2) && (buf[i] != -1)) {
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errs++;
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fprintf(stderr, "Process %d: buf %d is %d, should be -1\n",
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mynod, i, buf[i]);
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}
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if (!(i%2) && (buf[i] != i)) {
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errs++;
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fprintf(stderr, "Process %d: buf %d is %d, should be %d\n",
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mynod, i, buf[i], i);
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}
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}
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else {
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if ((i%2) && (buf[i] != i + mynod*SIZE)) {
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errs++;
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fprintf(stderr, "Process %d: buf %d is %d, should be %d\n",
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mynod, i, buf[i], i + mynod*SIZE);
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}
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if (!(i%2) && (buf[i] != -1)) {
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errs++;
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fprintf(stderr, "Process %d: buf %d is %d, should be -1\n",
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mynod, i, buf[i]);
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}
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}
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}
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MPI_File_close(&fh);
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MPI_Barrier(MPI_COMM_WORLD);
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if (!mynod) {
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#if VERBOSE
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fprintf(stderr, "\ntesting contiguous in memory, noncontiguous in file using independent I/O\n");
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#endif
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MPI_File_delete(filename, MPI_INFO_NULL);
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}
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MPI_Barrier(MPI_COMM_WORLD);
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MPI_File_open(MPI_COMM_WORLD, filename, MPI_MODE_CREATE | MPI_MODE_RDWR,
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info, &fh);
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/* set the file view so that we have interleaved access again */
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MPI_File_set_view(fh, 0, MPI_INT, newtype, "native", info);
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/* this time write a contiguous buffer */
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for (i=0; i<SIZE; i++) buf[i] = i + mynod*SIZE;
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MPI_File_write(fh, buf, SIZE, MPI_INT, &status);
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MPI_Barrier(MPI_COMM_WORLD);
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/* fill buffer with -1's; this time they will all be overwritten */
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for (i=0; i<SIZE; i++) buf[i] = -1;
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MPI_File_read_at(fh, 0, buf, SIZE, MPI_INT, &status);
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for (i=0; i<SIZE; i++) {
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if (!mynod) {
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if (buf[i] != i) {
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errs++;
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fprintf(stderr, "Process %d: buf %d is %d, should be %d\n",
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mynod, i, buf[i], i);
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}
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}
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else {
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if (buf[i] != i + mynod*SIZE) {
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errs++;
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fprintf(stderr, "Process %d: buf %d is %d, should be %d\n",
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mynod, i, buf[i], i + mynod*SIZE);
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}
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}
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}
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MPI_File_close(&fh);
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MPI_Allreduce( &errs, &toterrs, 1, MPI_INT, MPI_SUM, MPI_COMM_WORLD );
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if (mynod == 0) {
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if( toterrs > 0) {
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fprintf( stderr, "Found %d errors\n", toterrs );
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}
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else {
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fprintf( stdout, " No Errors\n" );
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}
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}
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MPI_Type_free(&newtype);
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MPI_Info_free(&info);
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free(buf);
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free(filename);
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MPI_Finalize();
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return 0;
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}
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