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/*
* Copyright (C) by Argonne National Laboratory
* See COPYRIGHT in top-level directory
*/
#include "mpi.h"
#include <stdio.h>
#include <stdlib.h>
#include "mpitest.h"
/*
static char MTEST_Descrip[] = "Test MPI_Exscan";
*/
int main(int argc, char *argv[])
{
int errs = 0;
int rank, size;
int minsize = 2, count;
int *sendbuf, *recvbuf, i;
MPI_Comm comm;
MTest_Init(&argc, &argv);
/* The following illustrates the use of the routines to
* run through a selection of communicators and datatypes.
* Use subsets of these for tests that do not involve combinations
* of communicators, datatypes, and counts of datatypes */
while (MTestGetIntracommGeneral(&comm, minsize, 1)) {
if (comm == MPI_COMM_NULL)
continue;
MPI_Comm_rank(comm, &rank);
MPI_Comm_size(comm, &size);
for (count = 1; count < 65000; count = count * 2) {
sendbuf = (int *) malloc(count * sizeof(int));
recvbuf = (int *) malloc(count * sizeof(int));
for (i = 0; i < count; i++) {
sendbuf[i] = rank + i * size;
recvbuf[i] = -1;
}
MPI_Exscan(sendbuf, recvbuf, count, MPI_INT, MPI_SUM, comm);
/* Check the results. rank 0 has no data */
if (rank > 0) {
int result;
for (i = 0; i < count; i++) {
result = rank * i * size + ((rank) * (rank - 1)) / 2;
if (recvbuf[i] != result) {
errs++;
if (errs < 10) {
fprintf(stderr, "Error in recvbuf[%d] = %d on %d, expected %d\n",
i, recvbuf[i], rank, result);
}
}
}
}
#if MTEST_HAVE_MIN_MPI_VERSION(2,2)
/* now try the MPI_IN_PLACE flavor */
for (i = 0; i < count; i++) {
sendbuf[i] = -1; /* unused */
recvbuf[i] = rank + i * size;
}
MPI_Exscan(MPI_IN_PLACE, recvbuf, count, MPI_INT, MPI_SUM, comm);
/* Check the results. rank 0's data must remain unchanged */
for (i = 0; i < count; i++) {
int result;
if (rank == 0)
result = rank + i * size;
else
result = rank * i * size + ((rank) * (rank - 1)) / 2;
if (recvbuf[i] != result) {
errs++;
if (errs < 10) {
fprintf(stderr, "Error in recvbuf[%d] = %d on %d, expected %d\n",
i, recvbuf[i], rank, result);
}
}
}
#endif
free(sendbuf);
free(recvbuf);
}
MTestFreeComm(&comm);
}
MTest_Finalize(errs);
return MTestReturnValue(errs);
}
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