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/*
* Copyright (C) by Argonne National Laboratory
* See COPYRIGHT in top-level directory
*/
#include "mpi.h"
#include "mpitestconf.h"
#ifdef HAVE_IOSTREAM
// Not all C++ compilers have iostream instead of iostream.h
#include <iostream>
#ifdef HAVE_NAMESPACE_STD
// Those that do often need the std namespace; otherwise, a bare "cout"
// is likely to fail to compile
using namespace std;
#endif
#else
#include <iostream.h>
#endif
#include "mpitestcxx.h"
static char MTEST_Descrip[] = "Simple intercomm alltoall test";
int main(int argc, char *argv[])
{
int errs = 0;
int *sendbuf = 0, *recvbuf = 0;
int leftGroup, i, j, idx, count, rank, rsize;
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 < 66000; count = 2 * count) {
/* Get an intercommunicator */
rsize = comm.Get_remote_size();
rank = comm.Get_rank();
sendbuf = new int[rsize * count];
recvbuf = new int[rsize * count];
for (i = 0; i < rsize * count; i++)
recvbuf[i] = -1;
if (leftGroup) {
idx = 0;
for (j = 0; j < rsize; j++) {
for (i = 0; i < count; i++) {
sendbuf[idx++] = i + rank;
}
}
try {
comm.Alltoall(sendbuf, count, datatype, NULL, 0, datatype);
}
catch(MPI::Exception e) {
errs++;
MTestPrintError(e.Get_error_code());
}
} else {
int rank, size;
rank = comm.Get_rank();
size = comm.Get_size();
/* In the right group */
try {
comm.Alltoall(NULL, 0, datatype, recvbuf, count, datatype);
}
catch(MPI::Exception e) {
errs++;
MTestPrintError(e.Get_error_code());
}
/* Check that we have received the correct data */
idx = 0;
for (j = 0; j < rsize; j++) {
for (i = 0; i < count; i++) {
if (recvbuf[idx++] != i + j) {
errs++;
if (errs < 10)
cout << "buf[" << i << "] = " <<
recvbuf[i] << " on " << rank << "\n";
}
}
}
}
delete[]recvbuf;
delete[]sendbuf;
}
MTestFreeComm(comm);
}
MTest_Finalize(errs);
return 0;
}
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