/* -*- 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 allgatherv test";

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

{

    int errs = 0;

    int *rbuf = 0, *sbuf = 0;

    int *recvcounts, *recvdispls;

    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;

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

            /* Get an intercommunicator */

            /* The left group will send rank to the right group;

             * The right group will send -rank to the left group */

            rank = comm.Get_rank();

            rsize = comm.Get_remote_size();

            rbuf = new int[count * rsize];

            sbuf = new int[count];

            recvcounts = new int[rsize];

            recvdispls = new int[rsize];

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

                rbuf[i] = -1;

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

                recvcounts[i] = count;

                recvdispls[i] = i * count;

            }

            if (leftGroup) {

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

                    sbuf[i] = i + rank * count;

            } else {

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

                    sbuf[i] = -(i + rank * count);

            }

            try {

                comm.Allgatherv(sbuf, count, datatype, rbuf, recvcounts, recvdispls, datatype);

            }

            catch(MPI::Exception e) {

                errs++;

                MTestPrintError(e.Get_error_code());

            }

            if (leftGroup) {

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

                    if (rbuf[i] != -i) {

                        errs++;

                    }

                }

            } else {

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

                    if (rbuf[i] != i) {

                        errs++;

                    }

                }

            }

            /* Use Allgather in a unidirectional way */

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

                rbuf[i] = -1;

            if (leftGroup) {

                try {

                    comm.Allgatherv(sbuf, 0, datatype, rbuf, recvcounts, recvdispls, datatype);

                }

                catch(MPI::Exception e) {

                    errs++;

                    MTestPrintError(e.Get_error_code());

                }

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

                    if (rbuf[i] != -i) {

                        errs++;

                    }

                }

            } else {

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

                    recvcounts[i] = 0;

                    recvdispls[i] = 0;

                }

                try {

                    comm.Allgatherv(sbuf, count, datatype, rbuf, recvcounts, recvdispls, datatype);

                }

                catch(MPI::Exception e) {

                    errs++;

                    MTestPrintError(e.Get_error_code());

                }

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

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

                        errs++;

                    }

                }

            }

            delete[]rbuf;

            delete[]sbuf;

            delete[]recvcounts;

            delete[]recvdispls;

        }

        MTestFreeComm(comm);

    }

    MTest_Finalize(errs);

    return 0;

}