/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */

/*

 *  (C) 2001 by Argonne National Laboratory.

 *      See COPYRIGHT in top-level directory.

 */

/* define TEST_RECV_VECTOR to receive the data using the vector datatype.

   undefine TEST_RECV_VECTOR to receive the data into a contiguous array. */

#define TEST_RECV_VECTOR

#include <stdlib.h>

#include <stdio.h>

#include "mpi.h"

#include <limits.h>

int MPID_Progress_test(void);

int main(int argc, char **argv)

{

    int size;

    int rank;

    int niter = 1;

    int msg_count = 0;

    int msg_blocklength = 1;

    int msg_stride = 1;

    int msg_sz;

    int *buf;

    int buf_sz;

    int iter;

    int i;

    MPI_Datatype dt;

    if (MPI_Init(&argc, &argv) != MPI_SUCCESS) {

        printf("ERROR: problem with MPI_Init\n");

        fflush(stdout);

    }

    if (MPI_Comm_size(MPI_COMM_WORLD, &size) != MPI_SUCCESS) {

        printf("ERROR: problem with MPI_Comm_size\n");

        fflush(stdout);

    }

    if (MPI_Comm_rank(MPI_COMM_WORLD, &rank) != MPI_SUCCESS) {

        printf("ERROR: problem with MPI_Comm_rank\n");

        fflush(stdout);

    }

    printf("srvec: size %d rank %d\n", size, rank);

    fflush(stdout);

    if (size < 2) {

        if (rank == 0) {

            printf("ERROR: needs to be run with at least 2 procs\n");

            fflush(stdout);

        }

        goto main_exit;

    }

    if (argc > 1) {

        sscanf(argv[1], "%d", &niter);

    }

    if (argc > 2) {

        sscanf(argv[2], "%d", &msg_count);

    }

    if (argc > 3) {

        sscanf(argv[3], "%d", &msg_blocklength);

    }

    if (argc > 4) {

        sscanf(argv[4], "%d", &msg_stride);

    }

    if (msg_stride < msg_blocklength) {

        if (rank == 0) {

            printf("ERROR: stride < blocklength\n");

            fflush(stdout);

        }

        goto main_exit;

    }

    msg_sz = msg_count * msg_blocklength;

    buf_sz = msg_count * msg_stride;

    if (rank == 0) {

        printf("niter=%d, msg_count=%d, msg_blocklength=%d, msg_stride=%d\n",

               niter, msg_count, msg_blocklength, msg_stride);

        printf("msg_sz=%d, buf_sz=%d\n", msg_sz, buf_sz);

        fflush(stdout);

    }

    if (buf_sz > 0) {

        buf = (int *) malloc(buf_sz * sizeof(int));

        /* printf("%d: buf=%p\n", rank, buf); fflush(stdout); */

    } else {

        buf = NULL;

    }

    MPI_Type_vector(msg_count, msg_blocklength, msg_stride, MPI_INT, &dt);

    MPI_Type_commit(&dt);

    if (rank == 0) {

        /* usleep(10000); */

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

            buf[i] = INT_MAX;

        }

        for (iter = 0; iter < niter; iter++) {

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

                buf[i] = iter * buf_sz + i;

            }

            if (MPI_Send(buf, 1, dt, 1, iter, MPI_COMM_WORLD) != MPI_SUCCESS) {

                printf("ERROR: problem with MPI_Send\n");

                fflush(stdout);

            }

        }

    } else if (rank == 1) {

        MPI_Status status;

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

            buf[i] = INT_MIN;

        }

        for (iter = 0; iter < niter; iter++) {

#	    if defined(TEST_RECV_VECTOR)

            {

                if (MPI_Recv(buf, msg_sz, MPI_INT, 0, iter, MPI_COMM_WORLD, &status) != MPI_SUCCESS) {

                    printf("ERROR: problem with MPI_Recv\n");

                    fflush(stdout);

                }

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

                    const int expected = iter * buf_sz + i / msg_blocklength *

                        msg_stride + i % msg_blocklength;

                    if (buf[i] != expected) {

                        printf("ERROR: %d != %d, i=%d iter=%d\n", buf[i], expected, i, iter);

                        fflush(stdout);

                        abort();

                    }

                }

            }

#	    else

            {

                if (MPI_Recv(buf, 1, dt, 0, iter, MPI_COMM_WORLD, &status)

                    != MPI_SUCCESS) {

                    printf("ERROR: problem with MPI_Recv\n");

                    fflush(stdout);

                }

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

                    if (i % msg_stride < msg_blocklength && buf[i] != iter * buf_sz + i) {

                        printf("ERROR: %d != %d, i=%d iter=%d\n", buf[i],

                               iter * buf_sz + i, i, iter);

                        fflush(stdout);

                        abort();

                    }

                }

            }

#	    endif

        }

        printf("All messages successfully received!\n");

        fflush(stdout);

    }

  main_exit:

    MPI_Barrier(MPI_COMM_WORLD);

    printf("srvec: process %d finished\n", rank);

    fflush(stdout);

    if (MPI_Finalize() != MPI_SUCCESS) {

        printf("ERROR: problem with MPI_Finalize\n");

        fflush(stdout);

    }

    return 0;

}