/* -*- 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;

}