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/*
* Copyright (C) by Argonne National Laboratory
* See COPYRIGHT in top-level directory
*/
#include "mpi.h"
#include <stdio.h>
#include <stdlib.h>
#include "mpitest.h"
int AllocateGrid(int nx, int ny, int **srcArray, int **destArray);
int PackUnpack(MPI_Datatype, const int[], int[], int);
int main(int argc, char *argv[])
{
int errs = 0;
int wrank, wsize;
int gsizes[3], distribs[3], dargs[3], psizes[3];
int px, py, nx, ny, rx, ry, bx, by;
int *srcArray, *destArray;
int i, j, ii, jj, loc;
MPI_Datatype darraytype;
MTest_Init(0, 0);
MPI_Comm_rank(MPI_COMM_WORLD, &wrank);
MPI_Comm_size(MPI_COMM_WORLD, &wsize);
/* Test 1: Simple, 1-D cyclic decomposition */
if (AllocateGrid(1, 3 * wsize, &srcArray, &destArray)) {
MPI_Abort(MPI_COMM_WORLD, 1);
}
/* Simple cyclic with 1-dim global array */
gsizes[0] = 3 * wsize;
distribs[0] = MPI_DISTRIBUTE_CYCLIC;
dargs[0] = 1;
psizes[0] = wsize;
MPI_Type_create_darray(wsize, wrank, 1,
gsizes, distribs, dargs, psizes, MPI_ORDER_C, MPI_INT, &darraytype);
/* Check the created datatype. Because cyclic, should represent
* a strided type */
if (PackUnpack(darraytype, srcArray, destArray, 3)) {
fprintf(stderr, "Error in pack/unpack check\n");
MPI_Abort(MPI_COMM_WORLD, 1);
}
/* Now, check for correct data */
for (i = 0; i < 3; i++) {
if (destArray[i] != wrank + i * wsize) {
fprintf(stderr, "1D: %d: Expected %d but saw %d\n", i, wrank + i * wsize, destArray[i]);
errs++;
}
}
free(destArray);
free(srcArray);
MPI_Type_free(&darraytype);
/* Test 2: Simple, 1-D cyclic decomposition, with block size=2 */
if (AllocateGrid(1, 4 * wsize, &srcArray, &destArray)) {
MPI_Abort(MPI_COMM_WORLD, 1);
}
/* Simple cyclic with 1-dim global array */
gsizes[0] = 4 * wsize;
distribs[0] = MPI_DISTRIBUTE_CYCLIC;
dargs[0] = 2;
psizes[0] = wsize;
MPI_Type_create_darray(wsize, wrank, 1,
gsizes, distribs, dargs, psizes, MPI_ORDER_C, MPI_INT, &darraytype);
/* Check the created datatype. Because cyclic, should represent
* a strided type */
if (PackUnpack(darraytype, srcArray, destArray, 4)) {
fprintf(stderr, "Error in pack/unpack check\n");
MPI_Abort(MPI_COMM_WORLD, 1);
}
loc = 0;
/* for each cyclic element */
for (i = 0; i < 2; i++) {
/* For each element in block */
for (j = 0; j < 2; j++) {
if (destArray[loc] != 2 * wrank + i * 2 * wsize + j) {
fprintf(stderr, "1D(2): %d: Expected %d but saw %d\n",
i, 2 * wrank + i * 2 * wsize + j, destArray[loc]);
errs++;
}
loc++;
}
}
free(destArray);
free(srcArray);
MPI_Type_free(&darraytype);
/* 2D: Create some 2-D decompositions */
px = wsize / 2;
py = 2;
rx = wrank % px;
ry = wrank / px;
if (px * py != wsize) {
fprintf(stderr, "An even number of processes is required\n");
MPI_Abort(MPI_COMM_WORLD, 1);
}
/* Cyclic/Cyclic */
if (AllocateGrid(5 * px, 7 * py, &srcArray, &destArray)) {
MPI_Abort(MPI_COMM_WORLD, 1);
}
/* Simple cyclic/cyclic. Note in C order, the [1] index varies most
* rapidly */
gsizes[0] = ny = 7 * py;
gsizes[1] = nx = 5 * px;
distribs[0] = MPI_DISTRIBUTE_CYCLIC;
distribs[1] = MPI_DISTRIBUTE_CYCLIC;
dargs[0] = 1;
dargs[1] = 1;
psizes[0] = py;
psizes[1] = px;
MPI_Type_create_darray(wsize, wrank, 2,
gsizes, distribs, dargs, psizes, MPI_ORDER_C, MPI_INT, &darraytype);
/* Check the created datatype. Because cyclic, should represent
* a strided type */
if (PackUnpack(darraytype, srcArray, destArray, 5 * 7)) {
fprintf(stderr, "Error in pack/unpack check\n");
MPI_Abort(MPI_COMM_WORLD, 1);
}
loc = 0;
for (j = 0; j < 7; j++) {
for (i = 0; i < 5; i++) {
int expected = rx + ry * nx + i * px + j * nx * py;
if (destArray[loc] != expected) {
errs++;
fprintf(stderr, "2D(cc): [%d,%d] = %d, expected %d\n",
i, j, destArray[loc], expected);
}
loc++;
}
}
free(srcArray);
free(destArray);
MPI_Type_free(&darraytype);
/* Cyclic(2)/Cyclic(3) */
if (AllocateGrid(6 * px, 4 * py, &srcArray, &destArray)) {
MPI_Abort(MPI_COMM_WORLD, 1);
}
/* Block cyclic/cyclic. Note in C order, the [1] index varies most
* rapidly */
gsizes[0] = ny = 4 * py;
gsizes[1] = nx = 6 * px;
distribs[0] = MPI_DISTRIBUTE_CYCLIC;
distribs[1] = MPI_DISTRIBUTE_CYCLIC;
dargs[0] = by = 2;
dargs[1] = bx = 3;
psizes[0] = py;
psizes[1] = px;
MPI_Type_create_darray(wsize, wrank, 2,
gsizes, distribs, dargs, psizes, MPI_ORDER_C, MPI_INT, &darraytype);
/* Check the created datatype. Because cyclic, should represent
* a strided type */
if (PackUnpack(darraytype, srcArray, destArray, 4 * 6)) {
fprintf(stderr, "Error in pack/unpack check\n");
MPI_Abort(MPI_COMM_WORLD, 1);
}
loc = 0;
for (j = 0; j < 4 / by; j++) {
for (jj = 0; jj < by; jj++) {
for (i = 0; i < 6 / bx; i++) {
for (ii = 0; ii < bx; ii++) {
int expected = rx * bx + ry * by * nx + i * bx * px + ii +
(j * by * py + jj) * nx;
if (destArray[loc] != expected) {
errs++;
fprintf(stderr, "2D(c(2)c(3)): [%d,%d] = %d, expected %d\n",
i * bx + ii, j * by + jj, destArray[loc], expected);
}
loc++;
}
}
}
}
free(srcArray);
free(destArray);
MPI_Type_free(&darraytype);
MTest_Finalize(errs);
return MTestReturnValue(errs);
}
int AllocateGrid(int nx, int ny, int **srcArray, int **destArray)
{
int *src, *dest;
int i;
src = (int *) malloc(nx * ny * sizeof(int));
dest = (int *) malloc(nx * ny * sizeof(int));
if (!src || !dest) {
fprintf(stderr, "Unable to allocate test arrays of size (%d x %d)\n", nx, ny);
return 1;
}
for (i = 0; i < nx * ny; i++) {
src[i] = i;
dest[i] = -i - 1;
}
*srcArray = src;
*destArray = dest;
return 0;
}
/* Extract the source array into the dest array using the DARRAY datatype.
"count" integers are returned in destArray */
int PackUnpack(MPI_Datatype darraytype, const int srcArray[], int destArray[], int count)
{
int packsize, position;
int *packArray;
MPI_Type_commit(&darraytype);
MPI_Pack_size(1, darraytype, MPI_COMM_SELF, &packsize);
packArray = (int *) malloc(packsize);
if (!packArray) {
fprintf(stderr, "Unable to allocate pack array of size %d\n", packsize);
MPI_Abort(MPI_COMM_WORLD, 1);
}
position = 0;
MPI_Pack((int *) srcArray, 1, darraytype, packArray, packsize, &position, MPI_COMM_SELF);
packsize = position;
position = 0;
MPI_Unpack(packArray, packsize, &position, destArray, count, MPI_INT, MPI_COMM_SELF);
free(packArray);
return 0;
}
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