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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"
/*
static char MTEST_Descrip[] = "Test MPI_Reduce with non-commutative user-define operations";
*/
/*
* This tests that the reduce operation respects the noncommutative flag.
* See red4.c for a version that can distinguish between P_{root} P_{root+1}
* ... P_{root-1} and P_0 ... P_{size-1} . The MPI standard clearly
* specifies that the result is P_0 ... P_{size-1}, independent of the root
* (see 4.9.4 in MPI-1)
*/
/* This implements a simple matrix-matrix multiply. This is an associative
but not commutative operation. The matrix size is set in matSize;
the number of matrices is the count argument. The matrix is stored
in C order, so that
c(i,j) is cin[j+i*matSize]
*/
#define MAXCOL 256
static int matSize = 0; /* Must be < MAXCOL */
void uop(void *cinPtr, void *coutPtr, int *count, MPI_Datatype * dtype);
void uop(void *cinPtr, void *coutPtr, int *count, MPI_Datatype * dtype)
{
const int *cin = (const int *) cinPtr;
int *cout = (int *) coutPtr;
int i, j, k, nmat;
int tempCol[MAXCOL];
for (nmat = 0; nmat < *count; nmat++) {
for (j = 0; j < matSize; j++) {
for (i = 0; i < matSize; i++) {
tempCol[i] = 0;
for (k = 0; k < matSize; k++) {
/* col[i] += cin(i,k) * cout(k,j) */
tempCol[i] += cin[k + i * matSize] * cout[j + k * matSize];
}
}
for (i = 0; i < matSize; i++) {
cout[j + i * matSize] = tempCol[i];
}
}
}
}
/* Initialize the integer matrix as a permutation of rank with rank+1.
If we call this matrix P_r, we know that product of P_0 P_1 ... P_{size-2}
is a left shift by 1.
*/
static void initMat(MPI_Comm comm, int mat[])
{
int i, size, rank;
MPI_Comm_rank(comm, &rank);
MPI_Comm_size(comm, &size);
for (i = 0; i < size * size; i++)
mat[i] = 0;
/* For each row */
for (i = 0; i < size; i++) {
if (rank != size - 1) {
if (i == rank)
mat[((i + 1) % size) + i * size] = 1;
else if (i == ((rank + 1) % size))
mat[((i + size - 1) % size) + i * size] = 1;
else
mat[i + i * size] = 1;
} else {
mat[i + i * size] = 1;
}
}
}
#ifdef FOO
/* Compare a matrix with the identity matrix */
static int isIdentity(MPI_Comm comm, int mat[])
{
int i, j, size, rank, errs = 0;
MPI_Comm_rank(comm, &rank);
MPI_Comm_size(comm, &size);
for (i = 0; i < size; i++) {
for (j = 0; j < size; j++) {
if (i == j) {
if (mat[j + i * size] != 1) {
errs++;
}
} else {
if (mat[j + i * size] != 0) {
errs++;
}
}
}
}
return errs;
}
#endif
/* Compare a matrix with the identity matrix */
static int isShiftLeft(MPI_Comm comm, int mat[])
{
int i, j, size, rank, errs = 0;
MPI_Comm_rank(comm, &rank);
MPI_Comm_size(comm, &size);
for (i = 0; i < size; i++) {
for (j = 0; j < size; j++) {
if (i == ((j + 1) % size)) {
if (mat[j + i * size] != 1) {
errs++;
}
} else {
if (mat[j + i * size] != 0) {
errs++;
}
}
}
}
return errs;
}
int main(int argc, char *argv[])
{
int errs = 0;
int rank, size, root;
int minsize = 2, count;
MPI_Comm comm;
int *buf, *bufout;
MPI_Op op;
MPI_Datatype mattype;
MTest_Init(&argc, &argv);
MPI_Op_create(uop, 0, &op);
while (MTestGetIntracommGeneral(&comm, minsize, 1)) {
if (comm == MPI_COMM_NULL)
continue;
MPI_Comm_size(comm, &size);
MPI_Comm_rank(comm, &rank);
matSize = size; /* used by the user-defined operation */
/* Only one matrix for now */
count = 1;
/* A single matrix, the size of the communicator */
MPI_Type_contiguous(size * size, MPI_INT, &mattype);
MPI_Type_commit(&mattype);
buf = (int *) malloc(count * size * size * sizeof(int));
if (!buf)
MPI_Abort(MPI_COMM_WORLD, 1);
bufout = (int *) malloc(count * size * size * sizeof(int));
if (!bufout)
MPI_Abort(MPI_COMM_WORLD, 1);
for (root = 0; root < size; root++) {
initMat(comm, buf);
MPI_Reduce(buf, bufout, count, mattype, op, root, comm);
if (rank == root) {
errs += isShiftLeft(comm, bufout);
}
/* Try the same test, but using MPI_IN_PLACE */
initMat(comm, bufout);
if (rank == root) {
MPI_Reduce(MPI_IN_PLACE, bufout, count, mattype, op, root, comm);
} else {
MPI_Reduce(bufout, NULL, count, mattype, op, root, comm);
}
if (rank == root) {
errs += isShiftLeft(comm, bufout);
}
}
free(buf);
free(bufout);
MPI_Type_free(&mattype);
MTestFreeComm(&comm);
}
MPI_Op_free(&op);
MTest_Finalize(errs);
return MTestReturnValue(errs);
}
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