/* -*- 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 */

/* this test is almost exactly like i_noncontig_coll.c with the following changes:

 *

 * . generalized file writing/reading to handle arbitrary number of processors

 * . provides the "cb_config_list" hint with several permutations of the

 *   avaliable processors.

 *   [ makes use of code copied from ROMIO's ADIO code to collect the names of

 *   the processors ]

 */

/* we are going to muck with this later to make it evenly divisible by however many compute nodes we have */

#define STARTING_SIZE 5000

int test_file(char *filename, int mynod, int nprocs, char *cb_hosts, const char *msg, int verbose);

#define ADIOI_Free free

#define ADIOI_Malloc malloc

#define FPRINTF fprintf

/* I have no idea what the "D" stands for; it's how things are done in adio.h

 */

struct ADIO_cb_name_arrayD {

    int refct;

    int namect;

    char **names;

};

typedef struct ADIO_cb_name_arrayD *ADIO_cb_name_array;

void handle_error(int errcode, const char *str);

int cb_gather_name_array(MPI_Comm comm, ADIO_cb_name_array * arrayp);

void default_str(int mynod, int len, ADIO_cb_name_array array, char *dest);

void reverse_str(int mynod, int len, ADIO_cb_name_array array, char *dest);

void reverse_alternating_str(int mynod, int len, ADIO_cb_name_array array, char *dest);

void simple_shuffle_str(int mynod, int len, ADIO_cb_name_array array, char *dest);

void handle_error(int errcode, const char *str)

{

    char msg[MPI_MAX_ERROR_STRING];

    int resultlen;

    MPI_Error_string(errcode, msg, &resultlen);

    fprintf(stderr, "%s: %s\n", str, msg);

    MPI_Abort(MPI_COMM_WORLD, 1);

}

/* cb_gather_name_array() - gather a list of processor names from all processes

 *                          in a communicator and store them on rank 0.

 *

 * This is a collective call on the communicator(s) passed in.

 *

 * Obtains a rank-ordered list of processor names from the processes in

 * "dupcomm".

 *

 * Returns 0 on success, -1 on failure.

 *

 * NOTE: Needs some work to cleanly handle out of memory cases!

 */

int cb_gather_name_array(MPI_Comm comm, ADIO_cb_name_array * arrayp)

{

    /* this is copied from ROMIO, but since this test is for correctness,

     * not performance, note that we have removed the parts where ROMIO

     * uses a keyval to cache the name array.  We'll just rebuild it if we

     * need to */

    char my_procname[MPI_MAX_PROCESSOR_NAME], **procname = 0;

    int *procname_len = NULL, my_procname_len, *disp = NULL, i;

    int commsize, commrank;

    ADIO_cb_name_array array = NULL;

    MPI_Comm_size(comm, &commsize);

    MPI_Comm_rank(comm, &commrank);

    MPI_Get_processor_name(my_procname, &my_procname_len);

    /* allocate space for everything */

    array = (ADIO_cb_name_array) malloc(sizeof(*array));

    if (array == NULL) {

        return -1;

    }

    array->refct = 1;

    if (commrank == 0) {

        /* process 0 keeps the real list */

        array->namect = commsize;

        array->names = (char **) ADIOI_Malloc(sizeof(char *) * commsize);

        if (array->names == NULL) {

            return -1;

        }

        procname = array->names;        /* simpler to read */

        procname_len = (int *) ADIOI_Malloc(commsize * sizeof(int));

        if (procname_len == NULL) {

            return -1;

        }

    }

    else {

        /* everyone else just keeps an empty list as a placeholder */

        array->namect = 0;

        array->names = NULL;

    }

    /* gather lengths first */

    MPI_Gather(&my_procname_len, 1, MPI_INT, procname_len, 1, MPI_INT, 0, comm);

    if (commrank == 0) {

#ifdef CB_CONFIG_LIST_DEBUG

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

            FPRINTF(stderr, "len[%d] = %d\n", i, procname_len[i]);

        }

#endif

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

            /* add one to the lengths because we need to count the

             * terminator, and we are going to use this list of lengths

             * again in the gatherv.

             */

            procname_len[i]++;

            procname[i] = malloc(procname_len[i]);

            if (procname[i] == NULL) {

                return -1;

            }

        }

        /* create our list of displacements for the gatherv.  we're going

         * to do everything relative to the start of the region allocated

         * for procname[0]

         *

         * I suppose it is theoretically possible that the distance between

         * malloc'd regions could be more than will fit in an int.  We don't

         * cover that case.

         */

        disp = malloc(commsize * sizeof(int));

        disp[0] = 0;

        for (i = 1; i < commsize; i++) {

            disp[i] = (int) (procname[i] - procname[0]);

        }

    }

    /* now gather strings */

    if (commrank == 0) {

        MPI_Gatherv(my_procname, my_procname_len + 1, MPI_CHAR,

                    procname[0], procname_len, disp, MPI_CHAR, 0, comm);

    }

    else {

        /* if we didn't do this, we would need to allocate procname[]

         * on all processes...which seems a little silly.

         */

        MPI_Gatherv(my_procname, my_procname_len + 1, MPI_CHAR,

                    NULL, NULL, NULL, MPI_CHAR, 0, comm);

    }

    if (commrank == 0) {

        /* no longer need the displacements or lengths */

        free(disp);

        free(procname_len);

#ifdef CB_CONFIG_LIST_DEBUG

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

            fprintf(stderr, "name[%d] = %s\n", i, procname[i]);

        }

#endif

    }

    *arrayp = array;

    return 0;

}

void default_str(int mynod, int len, ADIO_cb_name_array array, char *dest)

{

    char *ptr;

    int i, p;

    if (!mynod) {

        ptr = dest;

        for (i = 0; i < array->namect; i++) {

            p = snprintf(ptr, len, "%s,", array->names[i]);

            ptr += p;

        }

        /* chop off that last comma */

        dest[strlen(dest) - 1] = '\0';

    }

    MPI_Bcast(dest, len, MPI_CHAR, 0, MPI_COMM_WORLD);

}

void reverse_str(int mynod, int len, ADIO_cb_name_array array, char *dest)

{

    char *ptr;

    int i, p;

    if (!mynod) {

        ptr = dest;

        for (i = (array->namect - 1); i >= 0; i--) {

            p = snprintf(ptr, len, "%s,", array->names[i]);

            ptr += p;

        }

        dest[strlen(dest) - 1] = '\0';

    }

    MPI_Bcast(dest, len, MPI_CHAR, 0, MPI_COMM_WORLD);

}

void reverse_alternating_str(int mynod, int len, ADIO_cb_name_array array, char *dest)

{

    char *ptr;

    int i, p;

    if (!mynod) {

        ptr = dest;

        /* evens */

        for (i = (array->namect - 1); i >= 0; i -= 2) {

            p = snprintf(ptr, len, "%s,", array->names[i]);

            ptr += p;

        }

        /* odds */

        for (i = (array->namect - 2); i > 0; i -= 2) {

            p = snprintf(ptr, len, "%s,", array->names[i]);

            ptr += p;

        }

        dest[strlen(dest) - 1] = '\0';

    }

    MPI_Bcast(dest, len, MPI_CHAR, 0, MPI_COMM_WORLD);

}

void simple_shuffle_str(int mynod, int len, ADIO_cb_name_array array, char *dest)

{

    char *ptr;

    int i, p;

    if (!mynod) {

        ptr = dest;

        for (i = (array->namect / 2); i < array->namect; i++) {

            p = snprintf(ptr, len, "%s,", array->names[i]);

            ptr += p;

        }

        for (i = 0; i < (array->namect / 2); i++) {

            p = snprintf(ptr, len, "%s,", array->names[i]);

            ptr += p;

        }

        dest[strlen(dest) - 1] = '\0';

    }

    MPI_Bcast(dest, len, MPI_CHAR, 0, MPI_COMM_WORLD);

}

int main(int argc, char **argv)

{

    int i, mynod, nprocs, len, errs = 0, sum_errs = 0, verbose = 0;

    char *filename;

    char *cb_config_string;

    int cb_config_len;

    ADIO_cb_name_array array;

    MPI_Init(&argc, &argv);

    MPI_Comm_size(MPI_COMM_WORLD, &nprocs);

    MPI_Comm_rank(MPI_COMM_WORLD, &mynod);

    /* process 0 takes the file name as a command-line argument and

     * broadcasts it 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);

    }

    /* want to hint the cb_config_list, but do so in a non-sequential way */

    cb_gather_name_array(MPI_COMM_WORLD, &array);

    /* sanity check */

    if (!mynod) {

        if (array->namect < 2) {

            fprintf(stderr, "Run this test on two or more hosts\n");

            MPI_Abort(MPI_COMM_WORLD, 1);

        }

    }

    /* get space for the permuted cb_config_string */

    if (!mynod) {

        cb_config_len = 0;

        for (i = 0; i < array->namect; i++) {

            /* +1: space for either a , or \0 if last */

            cb_config_len += strlen(array->names[i]) + 1;

        }

        ++cb_config_len;

    }

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

    if ((cb_config_string = malloc(cb_config_len)) == NULL) {

        perror("malloc");

        MPI_Abort(MPI_COMM_WORLD, 1);

    }

    /* first, no hinting */

    errs += test_file(filename, mynod, nprocs, NULL, "collective w/o hinting", verbose);

    /* hint, but no change in order */

    default_str(mynod, cb_config_len, array, cb_config_string);

    errs += test_file(filename, mynod, nprocs, cb_config_string,

                      "collective w/ hinting: default order", verbose);

    /*  reverse order */

    reverse_str(mynod, cb_config_len, array, cb_config_string);

    errs += test_file(filename, mynod, nprocs, cb_config_string,

                      "collective w/ hinting: reverse order", verbose);

    /* reverse, every other */

    reverse_alternating_str(mynod, cb_config_len, array, cb_config_string);

    errs += test_file(filename, mynod, nprocs, cb_config_string,

                      "collective w/ hinting: permutation1", verbose);

    /* second half, first half */

    simple_shuffle_str(mynod, cb_config_len, array, cb_config_string);

    errs += test_file(filename, mynod, nprocs, cb_config_string,

                      "collective w/ hinting: permutation2", verbose);

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

    if (!mynod) {

        if (sum_errs)

            fprintf(stderr, "Found %d error cases\n", sum_errs);

        else

            printf(" No Errors\n");

    }

    if (mynod)

        free(filename);

    free(cb_config_string);

    MPI_Finalize();

    return 0;

}

#define SEEDER(x,y,z) ((x)*1000000 + (y) + (x)*(z))

int test_file(char *filename, int mynod, int nprocs, char *cb_hosts, const char *msg, int verbose)

{

    MPI_Datatype typevec, newtype, t[3];

    int *buf, i, b[3], errcode, errors = 0;

    MPI_File fh;

    MPI_Aint d[3];

    MPI_Request request;

    MPI_Status status;

    int SIZE = (STARTING_SIZE / nprocs) * nprocs;

    MPI_Info info;

    if (mynod == 0 && verbose)

        fprintf(stderr, "%s\n", msg);

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

    if (buf == NULL) {

        perror("test_file");

        MPI_Abort(MPI_COMM_WORLD, -1);

    }

    if (cb_hosts != NULL) {

        MPI_Info_create(&info;;

        MPI_Info_set(info, "cb_config_list", cb_hosts);

    }

    else {

        info = MPI_INFO_NULL;

    }

    MPI_Type_vector(SIZE / nprocs, 1, nprocs, 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");

        MPI_File_delete(filename, info);

    }

    MPI_Barrier(MPI_COMM_WORLD);

    errcode = MPI_File_open(MPI_COMM_WORLD, filename, MPI_MODE_CREATE | MPI_MODE_RDWR, info, &fh;;

    if (errcode != MPI_SUCCESS) {

        handle_error(errcode, "MPI_File_open");

    }

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

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

        buf[i] = SEEDER(mynod, i, SIZE);

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

    if (errcode != MPI_SUCCESS) {

        handle_error(errcode, "nc mem - nc file: MPI_File_iwrite_all");

    }

    MPI_Barrier(MPI_COMM_WORLD);

    MPI_Wait(&request, &status);

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

        buf[i] = -1;

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

    if (errcode != MPI_SUCCESS) {

        handle_error(errcode, "nc mem - nc file: MPI_File_iread_at_all");

    }

    MPI_Wait(&request, &status);

    /* the verification for N compute nodes is tricky. Say we have 3

     * processors.

     * process 0 sees: 0 -1 -1 3 -1 -1 ...

     * process 1 sees: -1 34 -1 -1 37 -1 ...

     * process 2 sees: -1 -1 68 -1 -1 71 ... */

    /* verify those leading -1s exist if they should */

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

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

            if (verbose)

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

            errors++;

        }

    }

    /* now the modulo games are hairy.  processor 0 sees real data in the 0th,

     * 3rd, 6th... elements of the buffer (assuming nprocs==3).  proc 1 sees

     * the data in 1st, 4th, 7th..., and proc 2 sees it in 2nd, 5th, 8th */

    for (/* 'i' set in above loop */ ; i < SIZE; i++) {

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

            if (verbose)

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

            errors++;

        }

        if (!((i - mynod) % nprocs) && buf[i] != SEEDER(mynod, i, SIZE)) {

            if (verbose)

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

                        mynod, i, buf[i], SEEDER(mynod, i, SIZE));

            errors++;

        }

    }

    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");

        MPI_File_delete(filename, info);

    }

    MPI_Barrier(MPI_COMM_WORLD);

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

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

        buf[i] = SEEDER(mynod, i, SIZE);

    errcode = MPI_File_iwrite_at_all(fh, mynod * (SIZE / nprocs) * sizeof(int),

                                     buf, 1, newtype, &request);

    if (errcode != MPI_SUCCESS)

        handle_error(errcode, "nc mem - c file: MPI_File_iwrite_at_all");

    MPI_Barrier(MPI_COMM_WORLD);

    MPI_Wait(&request, &status);

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

        buf[i] = -1;

    errcode = MPI_File_iread_at_all(fh, mynod * (SIZE / nprocs) * sizeof(int),

                                    buf, 1, newtype, &request);

    if (errcode != MPI_SUCCESS)

        handle_error(errcode, "nc mem - c file: MPI_File_iread_at_all");

    MPI_Wait(&request, &status);

    /* just like as above */

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

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

            if (verbose)

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

            errors++;

        }

    }

    for (/* i set in above loop */ ; i < SIZE; i++) {

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

            if (verbose)

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

            errors++;

        }

        if (!((i - mynod) % nprocs) && buf[i] != SEEDER(mynod, i, SIZE)) {

            if (verbose)

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

                        mynod, i, buf[i], SEEDER(mynod, i, SIZE));

            errors++;

        }

    }

    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");

        MPI_File_delete(filename, info);

    }

    MPI_Barrier(MPI_COMM_WORLD);

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

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

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

        buf[i] = SEEDER(mynod, i, SIZE);

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

    if (errcode != MPI_SUCCESS)

        handle_error(errcode, "c mem - nc file: MPI_File_iwrite_all");

    MPI_Barrier(MPI_COMM_WORLD);

    MPI_Wait(&request, &status);

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

        buf[i] = -1;

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

    if (errcode != MPI_SUCCESS)

        handle_error(errcode, "c mem - nc file: MPI_File_iread_at_all");

    MPI_Wait(&request, &status);

    /* same crazy checking */

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

        if (buf[i] != SEEDER(mynod, i, SIZE)) {

            if (verbose)

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

                        mynod, i, buf[i], SEEDER(mynod, i, SIZE));

            errors++;

        }

    }

    MPI_File_close(&fh;;

    MPI_Type_free(&newtype);

    free(buf);

    if (info != MPI_INFO_NULL)

        MPI_Info_free(&info;;

    return errors;

}