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/* -*- Mode: C++; c-basic-offset:4 ; -*- */
/*
*
* (C) 2003 by Argonne National Laboratory.
* See COPYRIGHT in top-level directory.
*/
#include "mpi.h"
#include <iostream>
#include "mpitestconf.h"
#include "mpitestcxx.h"
static char MTEST_Descrip[] = "Simple intercomm reduce test";
int main(int argc, char *argv[])
{
int errs = 0;
int *sendbuf = 0, *recvbuf = 0;
int leftGroup, i, count, rank;
MPI::Intercomm comm;
MPI::Datatype datatype;
MTest_Init();
datatype = MPI::INT;
while (MTestGetIntercomm(comm, leftGroup, 4)) {
if (comm == MPI::COMM_NULL)
continue;
for (count = 1; count < 65000; count = 2 * count) {
sendbuf = new int[count];
recvbuf = new int[count];
/* Get an intercommunicator */
for (i = 0; i < count; i++) {
sendbuf[i] = -1;
recvbuf[i] = -1;
}
if (leftGroup) {
rank = comm.Get_rank();
try {
comm.Reduce(sendbuf, recvbuf, count, datatype, MPI::SUM,
(rank == 0) ? MPI::ROOT : MPI::PROC_NULL);
}
catch(MPI::Exception e) {
errs++;
MTestPrintError(e.Get_error_code());
}
/* Test that no other process in this group received the
* broadcast, and that we got the right answers */
if (rank == 0) {
int rsize;
rsize = comm.Get_remote_size();
for (i = 0; i < count; i++) {
if (recvbuf[i] != i * rsize) {
errs++;
}
}
} else {
for (i = 0; i < count; i++) {
if (recvbuf[i] != -1) {
errs++;
}
}
}
} else {
/* In the right group */
for (i = 0; i < count; i++)
sendbuf[i] = i;
try {
comm.Reduce(sendbuf, recvbuf, count, datatype, MPI::SUM, 0);
}
catch(MPI::Exception e) {
errs++;
MTestPrintError(e.Get_error_code());
}
/* Check that we have received no data */
for (i = 0; i < count; i++) {
if (recvbuf[i] != -1) {
errs++;
}
}
}
delete[]sendbuf;
delete[]recvbuf;
}
MTestFreeComm(comm);
}
MTest_Finalize(errs);
return 0;
}
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