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/*
* Copyright (C) by Argonne National Laboratory
* See COPYRIGHT in top-level directory
*/
#include "mpitest.h"
#include <stdio.h>
#include <stdlib.h>
/* Test MPI_File_set_view with zero-len filetype on some of the processes */
/* The test is contributed Eric Chamberland. Reference issue #6222 */
int main(int argc, char *argv[])
{
int errs = 0;
MTest_Init(&argc, &argv);
int rank, size;
MPI_Comm_size(MPI_COMM_WORLD, &size);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
if (size != 3) {
printf("Please run with 3 processes.\n");
MPI_Finalize();
return 1;
}
int displacement[3];
int *buffer = 0;
int lTailleBuf = 0;
if (rank == 0) {
lTailleBuf = 3;
displacement[0] = 0;
displacement[1] = 4;
displacement[2] = 5;
buffer = malloc(sizeof(int) * lTailleBuf);
for (int i = 0; i < lTailleBuf; i++) {
buffer[i] = 10 * (i + 1);
}
}
if (rank == 1) {
lTailleBuf = 3;
displacement[0] = 1;
displacement[1] = 2;
displacement[2] = 3;
buffer = malloc(sizeof(int) * lTailleBuf);
for (int i = 0; i < lTailleBuf; i++) {
buffer[i] = -(i + 1);
}
}
if (rank == 2) {
// A rank without any "element" is ok normally:
lTailleBuf = 0;
}
MPI_File lFile;
MPI_File_open(MPI_COMM_WORLD, "testfile", MPI_MODE_RDWR | MPI_MODE_CREATE, MPI_INFO_NULL,
&lFile);
MPI_Datatype lTypeIndexIntWithExtent, lTypeIndexIntWithoutExtent;
MPI_Type_create_indexed_block(lTailleBuf, 1, displacement, MPI_INT,
&lTypeIndexIntWithoutExtent);
MPI_Type_commit(&lTypeIndexIntWithoutExtent);
// Here we compute the total number of int to write to resize the type:
int lTailleGlobale = 0;
MPI_Allreduce(&lTailleBuf, &lTailleGlobale, 1, MPI_INT, MPI_SUM, MPI_COMM_WORLD);
//We now modify the extent of the type "type_without_extent"
MPI_Type_create_resized(lTypeIndexIntWithoutExtent, 0, lTailleGlobale * sizeof(int),
&lTypeIndexIntWithExtent);
MPI_Type_commit(&lTypeIndexIntWithExtent);
MPI_File_set_view(lFile, 0, MPI_INT, lTypeIndexIntWithExtent, "native", MPI_INFO_NULL);
for (int i = 0; i < 2; ++i) {
MPI_File_write_all(lFile, buffer, lTailleBuf, MPI_INT, MPI_STATUS_IGNORE);
MPI_Offset lOffset, lSharedOffset;
MPI_File_get_position(lFile, &lOffset);
MPI_File_get_position_shared(lFile, &lSharedOffset);
MTestPrintfMsg(1, "[%d] Offset after write : %d int: Local: %lld Shared: %lld \n",
rank, lTailleBuf, lOffset, lSharedOffset);
}
MPI_File_close(&lFile);
MPI_Type_free(&lTypeIndexIntWithExtent);
MPI_Type_free(&lTypeIndexIntWithoutExtent);
if (buffer) {
free(buffer);
}
if (rank == 0) {
MPI_File_delete((char *) "testfile", MPI_INFO_NULL);
}
MTest_Finalize(errs);
return MTestReturnValue(errs);
}
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