/* -*- Mode: C++; c-basic-offset:4 ; -*- */

/*

 *

 *  (C) 2003 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 scatterv test";

int main(int argc, char *argv[])

{

    int errs = 0;

    int *buf = 0;

    int *sendcounts;

    int *senddispls;

    int leftGroup, i, 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;

        rsize = comm.Get_remote_size();

        for (count = 1; count < 65000; count = 2 * count) {

            /* Get an intercommunicator */

            buf = 0;

            sendcounts = new int[rsize];

            senddispls = new int[rsize];

            for (i = 0; i < rsize; i++) {

                sendcounts[i] = count;

                senddispls[i] = count * i;

            }

            if (leftGroup) {

                rank = comm.Get_rank();

                buf = new int[count * rsize];

                if (rank == 0) {

                    for (i = 0; i < count * rsize; i++)

                        buf[i] = i;

                } else {

                    for (i = 0; i < count * rsize; i++)

                        buf[i] = -1;

                }

                try {

                    comm.Scatterv(buf, sendcounts, senddispls, datatype,

                                  NULL, 0, datatype, (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

                 * scatter */

                if (rank != 0) {

                    for (i = 0; i < count * rsize; i++) {

                        if (buf[i] != -1) {

                            if (errs < 10) {

                                cout << "Received data on root group!\n";

                            }

                            errs++;

                        }

                    }

                }

            } else {

                int rank, size;

                rank = comm.Get_rank();

                size = comm.Get_size();

                buf = new int[count];

                /* In the right group */

                for (i = 0; i < count; i++)

                    buf[i] = -1;

                try {

                    comm.Scatterv(NULL, 0, 0, datatype, buf, count, datatype, 0);

                }

                catch(MPI::Exception e) {

                    errs++;

                    MTestPrintError(e.Get_error_code());

                }

                /* Check that we have received the correct data */

                for (i = 0; i < count; i++) {

                    if (buf[i] != i + rank * count) {

                        if (errs < 10)

                            cout << "buf[" << i << "] = " << buf[i] << " on " << rank << "\n";

                        errs++;

                    }

                }

            }

            delete[]sendcounts;

            delete[]senddispls;

            delete[]buf;

        }

        MTestFreeComm(comm);

    }

    MTest_Finalize(errs);

    return 0;

}