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

/*

 *  (C) 2014 by Argonne National Laboratory.

 *      See COPYRIGHT in top-level directory.

 */

#include "mpi.h"

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

/* tests noncontiguous reads/writes using nonblocking collective I/O */

#define SIZE 5000

#define VERBOSE 0

int main(int argc, char **argv)

{

    int *buf, i, mynod, nprocs, len, b[3];

    int errs = 0, toterrs;

    MPI_Aint d[3];

    MPI_File fh;

    MPI_Request request;

    MPI_Status status;

    char *filename;

    MPI_Datatype typevec, newtype, t[3];

    MPI_Init(&argc, &argv);

    MPI_Comm_size(MPI_COMM_WORLD, &nprocs);

    MPI_Comm_rank(MPI_COMM_WORLD, &mynod);

    if (nprocs != 2) {

        fprintf(stderr, "Run this program on two processes\n");

        MPI_Abort(MPI_COMM_WORLD, 1);

    }

    /* process 0 broadcasts the file name to other processes */

    if (!mynod) {

        filename = "testfile";

        len = strlen(filename);

        MPI_Bcast(&len, 1, MPI_INT, 0, MPI_COMM_WORLD);

        MPI_Bcast(filename, len + 1, MPI_CHAR, 0, MPI_COMM_WORLD);

    }

    else {

        MPI_Bcast(&len, 1, MPI_INT, 0, MPI_COMM_WORLD);

        filename = (char *) malloc(len + 1);

        MPI_Bcast(filename, len + 1, MPI_CHAR, 0, MPI_COMM_WORLD);

    }

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

    MPI_Type_vector(SIZE / 2, 1, 2, MPI_INT, &typevec);

    b[0] = b[1] = b[2] = 1;

    d[0] = 0;

    d[1] = mynod * sizeof(int);

    d[2] = SIZE * sizeof(int);

    t[0] = MPI_LB;

    t[1] = typevec;

    t[2] = MPI_UB;

    MPI_Type_struct(3, b, d, t, &newtype);

    MPI_Type_commit(&newtype);

    MPI_Type_free(&typevec);

    if (!mynod) {

#if VERBOSE

        fprintf(stderr, "\ntesting noncontiguous in memory, noncontiguous in "

                "file using collective I/O\n");

#endif

        MPI_File_delete(filename, MPI_INFO_NULL);

    }

    MPI_Barrier(MPI_COMM_WORLD);

    MPI_File_open(MPI_COMM_WORLD, filename, MPI_MODE_CREATE | MPI_MODE_RDWR, MPI_INFO_NULL, &fh;;

    MPI_File_set_view(fh, 0, MPI_INT, newtype, "native", MPI_INFO_NULL);

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

        buf[i] = i + mynod * SIZE;

    MPI_File_iwrite_all(fh, buf, 1, newtype, &request);

    MPI_Barrier(MPI_COMM_WORLD);

    MPI_Wait(&request, &status);

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

        buf[i] = -1;

    MPI_File_iread_at_all(fh, 0, buf, 1, newtype, &request);

    MPI_Wait(&request, &status);

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

        if (!mynod) {

            if ((i % 2) && (buf[i] != -1)) {

                errs++;

                fprintf(stderr, "Process %d: buf %d is %d, should be -1\n", mynod, i, buf[i]);

            }

            if (!(i % 2) && (buf[i] != i)) {

                errs++;

                fprintf(stderr, "Process %d: buf %d is %d, should be %d\n", mynod, i, buf[i], i);

            }

        }

        else {

            if ((i % 2) && (buf[i] != i + mynod * SIZE)) {

                errs++;

                fprintf(stderr, "Process %d: buf %d is %d, should be %d\n",

                        mynod, i, buf[i], i + mynod * SIZE);

            }

            if (!(i % 2) && (buf[i] != -1)) {

                errs++;

                fprintf(stderr, "Process %d: buf %d is %d, should be -1\n", mynod, i, buf[i]);

            }

        }

    }

    MPI_File_close(&fh;;

    MPI_Barrier(MPI_COMM_WORLD);

    if (!mynod) {

#if VERBOSE

        fprintf(stderr, "\ntesting noncontiguous in memory, contiguous in file "

                "using collective I/O\n");

#endif

        MPI_File_delete(filename, MPI_INFO_NULL);

    }

    MPI_Barrier(MPI_COMM_WORLD);

    MPI_File_open(MPI_COMM_WORLD, filename, MPI_MODE_CREATE | MPI_MODE_RDWR, MPI_INFO_NULL, &fh;;

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

        buf[i] = i + mynod * SIZE;

    MPI_File_iwrite_at_all(fh, mynod * (SIZE / 2) * sizeof(int), buf, 1, newtype, &request);

    MPI_Barrier(MPI_COMM_WORLD);

    MPI_Wait(&request, &status);

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

        buf[i] = -1;

    MPI_File_iread_at_all(fh, mynod * (SIZE / 2) * sizeof(int), buf, 1, newtype, &request);

    MPI_Wait(&request, &status);

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

        if (!mynod) {

            if ((i % 2) && (buf[i] != -1)) {

                errs++;

                fprintf(stderr, "Process %d: buf %d is %d, should be -1\n", mynod, i, buf[i]);

            }

            if (!(i % 2) && (buf[i] != i)) {

                errs++;

                fprintf(stderr, "Process %d: buf %d is %d, should be %d\n", mynod, i, buf[i], i);

            }

        }

        else {

            if ((i % 2) && (buf[i] != i + mynod * SIZE)) {

                errs++;

                fprintf(stderr, "Process %d: buf %d is %d, should be %d\n",

                        mynod, i, buf[i], i + mynod * SIZE);

            }

            if (!(i % 2) && (buf[i] != -1)) {

                errs++;

                fprintf(stderr, "Process %d: buf %d is %d, should be -1\n", mynod, i, buf[i]);

            }

        }

    }

    MPI_File_close(&fh;;

    MPI_Barrier(MPI_COMM_WORLD);

    if (!mynod) {

#if VERBOSE

        fprintf(stderr, "\ntesting contiguous in memory, noncontiguous in file "

                "using collective I/O\n");

#endif

        MPI_File_delete(filename, MPI_INFO_NULL);

    }

    MPI_Barrier(MPI_COMM_WORLD);

    MPI_File_open(MPI_COMM_WORLD, filename, MPI_MODE_CREATE | MPI_MODE_RDWR, MPI_INFO_NULL, &fh;;

    MPI_File_set_view(fh, 0, MPI_INT, newtype, "native", MPI_INFO_NULL);

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

        buf[i] = i + mynod * SIZE;

    MPI_File_iwrite_all(fh, buf, SIZE, MPI_INT, &request);

    MPI_Barrier(MPI_COMM_WORLD);

    MPI_Wait(&request, &status);

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

        buf[i] = -1;

    MPI_File_iread_at_all(fh, 0, buf, SIZE, MPI_INT, &request);

    MPI_Wait(&request, &status);

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

        if (!mynod) {

            if (buf[i] != i) {

                errs++;

                fprintf(stderr, "Process %d: buf %d is %d, should be %d\n", mynod, i, buf[i], i);

            }

        }

        else {

            if (buf[i] != i + mynod * SIZE) {

                errs++;

                fprintf(stderr, "Process %d: buf %d is %d, should be %d\n",

                        mynod, i, buf[i], i + mynod * SIZE);

            }

        }

    }

    MPI_File_close(&fh;;

    MPI_Allreduce(&errs, &toterrs, 1, MPI_INT, MPI_SUM, MPI_COMM_WORLD);

    if (mynod == 0) {

        if (toterrs > 0) {

            fprintf(stderr, "Found %d errors\n", toterrs);

        }

        else {

            fprintf(stdout, " No Errors\n");

        }

    }

    MPI_Type_free(&newtype);

    free(buf);

    if (mynod)

        free(filename);

    MPI_Finalize();

    return 0;

}