211 строки
6.0 KiB
C
211 строки
6.0 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 whether atomicity semantics are satisfied for overlapping accesses
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in atomic mode. The probability of detecting errors is higher if you run
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it on 8 or more processes. */
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/* The file name is taken as a command-line argument. */
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#define BUFSIZE 10000 /* no. of integers */
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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 *writebuf, *readbuf, i, mynod, nprocs, len, err;
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char *filename;
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int errs=0, toterrs;
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MPI_Datatype newtype;
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MPI_File fh;
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MPI_Status status;
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MPI_Info info;
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MPI_Init(&argc,&argv);
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MPI_Comm_rank(MPI_COMM_WORLD, &mynod);
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MPI_Comm_size(MPI_COMM_WORLD, &nprocs);
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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 (!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: coll_test -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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writebuf = (int *) malloc(BUFSIZE*sizeof(int));
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readbuf = (int *) malloc(BUFSIZE*sizeof(int));
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/* test atomicity of contiguous accesses */
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/* initialize file to all zeros */
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if (!mynod) {
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MPI_File_delete(filename, MPI_INFO_NULL);
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MPI_File_open(MPI_COMM_SELF, filename, MPI_MODE_CREATE |
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MPI_MODE_RDWR, MPI_INFO_NULL, &fh);
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for (i=0; i<BUFSIZE; i++) writebuf[i] = 0;
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MPI_File_write(fh, writebuf, BUFSIZE, MPI_INT, &status);
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MPI_File_close(&fh);
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#if VERBOSE
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fprintf(stderr, "\ntesting contiguous accesses\n");
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#endif
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}
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MPI_Barrier(MPI_COMM_WORLD);
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for (i=0; i<BUFSIZE; i++) writebuf[i] = 10;
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for (i=0; i<BUFSIZE; i++) readbuf[i] = 20;
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MPI_File_open(MPI_COMM_WORLD, filename, MPI_MODE_CREATE |
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MPI_MODE_RDWR, MPI_INFO_NULL, &fh);
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/* set atomicity to true */
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err = MPI_File_set_atomicity(fh, 1);
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if (err != MPI_SUCCESS) {
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fprintf(stderr, "Atomic mode not supported on this file system.\n");fflush(stderr);
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MPI_Abort(MPI_COMM_WORLD, 1);
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}
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MPI_Barrier(MPI_COMM_WORLD);
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/* process 0 writes and others concurrently read. In atomic mode,
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the data read must be either all old values or all new values; nothing
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in between. */
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if (!mynod) MPI_File_write(fh, writebuf, BUFSIZE, MPI_INT, &status);
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else {
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err = MPI_File_read(fh, readbuf, BUFSIZE, MPI_INT, &status);
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if (err == MPI_SUCCESS) {
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if (readbuf[0] == 0) { /* the rest must also be 0 */
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for (i=1; i<BUFSIZE; i++)
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if (readbuf[i] != 0) {
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errs++;
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fprintf(stderr, "Process %d: readbuf[%d] is %d, should be 0\n", mynod, i, readbuf[i]);
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MPI_Abort(MPI_COMM_WORLD, 1);
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}
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}
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else if (readbuf[0] == 10) { /* the rest must also be 10 */
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for (i=1; i<BUFSIZE; i++)
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if (readbuf[i] != 10) {
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errs++;
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fprintf(stderr, "Process %d: readbuf[%d] is %d, should be 10\n", mynod, i, readbuf[i]);
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MPI_Abort(MPI_COMM_WORLD, 1);
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}
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}
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else {
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errs++;
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fprintf(stderr, "Process %d: readbuf[0] is %d, should be either 0 or 10\n", mynod, readbuf[0]);
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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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/* repeat the same test with a noncontiguous filetype */
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MPI_Type_vector(BUFSIZE, 1, 2, MPI_INT, &newtype);
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MPI_Type_commit(&newtype);
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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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MPI_File_delete(filename, MPI_INFO_NULL);
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MPI_File_open(MPI_COMM_SELF, filename, MPI_MODE_CREATE |
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MPI_MODE_RDWR, info, &fh);
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for (i=0; i<BUFSIZE; i++) writebuf[i] = 0;
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MPI_File_set_view(fh, 0, MPI_INT, newtype, "native", info);
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MPI_File_write(fh, writebuf, BUFSIZE, MPI_INT, &status);
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MPI_File_close(&fh);
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#if VERBOSE
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fprintf(stderr, "\ntesting noncontiguous accesses\n");
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#endif
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}
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MPI_Barrier(MPI_COMM_WORLD);
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for (i=0; i<BUFSIZE; i++) writebuf[i] = 10;
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for (i=0; i<BUFSIZE; i++) readbuf[i] = 20;
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MPI_File_open(MPI_COMM_WORLD, filename, MPI_MODE_CREATE |
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MPI_MODE_RDWR, info, &fh);
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MPI_File_set_atomicity(fh, 1);
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MPI_File_set_view(fh, 0, MPI_INT, newtype, "native", info);
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MPI_Barrier(MPI_COMM_WORLD);
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if (!mynod) MPI_File_write(fh, writebuf, BUFSIZE, MPI_INT, &status);
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else {
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err = MPI_File_read(fh, readbuf, BUFSIZE, MPI_INT, &status);
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if (err == MPI_SUCCESS) {
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if (readbuf[0] == 0) {
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for (i=1; i<BUFSIZE; i++)
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if (readbuf[i] != 0) {
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errs++;
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fprintf(stderr, "Process %d: readbuf[%d] is %d, should be 0\n", mynod, i, readbuf[i]);
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MPI_Abort(MPI_COMM_WORLD, 1);
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}
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}
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else if (readbuf[0] == 10) {
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for (i=1; i<BUFSIZE; i++)
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if (readbuf[i] != 10) {
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errs++;
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fprintf(stderr, "Process %d: readbuf[%d] is %d, should be 10\n", mynod, i, readbuf[i]);
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MPI_Abort(MPI_COMM_WORLD, 1);
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}
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}
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else {
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errs++;
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fprintf(stderr, "Process %d: readbuf[0] is %d, should be either 0 or 10\n", mynod, readbuf[0]);
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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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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(writebuf);
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free(readbuf);
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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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