272 lines
7.4 KiB
C
272 lines
7.4 KiB
C
/*
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* Copyright (C) NHR@FAU, University Erlangen-Nuremberg.
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* All rights reserved. This file is part of nusif-solver.
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* Use of this source code is governed by a MIT style
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* license that can be found in the LICENSE file.
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*/
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "comm.h"
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#ifdef _MPI
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// subroutines local to this module
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static int sum(int* sizes, int position)
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{
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int sum = 0;
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for (int i = 0; i < position; i++) {
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sum += sizes[i];
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}
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return sum;
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}
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static void assembleResult(Comm* c, double* src, double* dst, int imax, int jmax)
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{
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MPI_Request* requests;
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int numRequests = 1;
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if (c->rank == 0) {
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numRequests = c->size + 1;
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} else {
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numRequests = 1;
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}
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requests = (MPI_Request*)malloc(numRequests * sizeof(MPI_Request));
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/* all ranks send their bulk array, including the external boundary layer */
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MPI_Datatype bulkType;
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int oldSizes[NDIMS] = { c->jmaxLocal + 2, c->imaxLocal + 2 };
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int newSizes[NDIMS] = { c->jmaxLocal, c->imaxLocal };
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int starts[NDIMS] = { 1, 1 };
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if (commIsBoundary(c, LEFT)) {
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newSizes[IDIM] += 1;
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starts[IDIM] = 0;
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}
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if (commIsBoundary(c, RIGHT)) {
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newSizes[IDIM] += 1;
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}
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if (commIsBoundary(c, BOTTOM)) {
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newSizes[JDIM] += 1;
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starts[JDIM] = 0;
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}
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if (commIsBoundary(c, TOP)) {
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newSizes[JDIM] += 1;
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}
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MPI_Type_create_subarray(NDIMS,
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oldSizes,
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newSizes,
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starts,
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MPI_ORDER_C,
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MPI_DOUBLE,
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&bulkType);
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MPI_Type_commit(&bulkType);
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MPI_Isend(src, 1, bulkType, 0, 0, c->comm, &requests[0]);
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int newSizesI[c->size];
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int newSizesJ[c->size];
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MPI_Gather(&newSizes[IDIM], 1, MPI_INT, newSizesI, 1, MPI_INT, 0, MPI_COMM_WORLD);
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MPI_Gather(&newSizes[JDIM], 1, MPI_INT, newSizesJ, 1, MPI_INT, 0, MPI_COMM_WORLD);
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/* rank 0 assembles the subdomains */
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if (c->rank == 0) {
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for (int i = 0; i < c->size; i++) {
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MPI_Datatype domainType;
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int oldSizes[NDIMS] = { jmax + 2, imax + 2 };
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int newSizes[NDIMS] = { newSizesJ[i], newSizesI[i] };
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int coords[NDIMS];
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MPI_Cart_coords(c->comm, i, NDIMS, coords);
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int starts[NDIMS] = { sum(newSizesJ, coords[JDIM]),
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sum(newSizesI, coords[IDIM]) };
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printf(
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"Rank: %d, Coords(i,j): %d %d, Size(i,j): %d %d, Target Size(i,j): %d %d "
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"Starts(i,j): %d %d\n",
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i,
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coords[IDIM],
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coords[JDIM],
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oldSizes[IDIM],
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oldSizes[JDIM],
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newSizes[IDIM],
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newSizes[JDIM],
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starts[IDIM],
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starts[JDIM]);
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MPI_Type_create_subarray(NDIMS,
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oldSizes,
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newSizes,
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starts,
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MPI_ORDER_C,
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MPI_DOUBLE,
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&domainType);
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MPI_Type_commit(&domainType);
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MPI_Irecv(dst, 1, domainType, i, 0, c->comm, &requests[i + 1]);
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MPI_Type_free(&domainType);
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}
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}
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MPI_Waitall(numRequests, requests, MPI_STATUSES_IGNORE);
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}
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#endif // defined _MPI
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// exported subroutines
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int commIsBoundary(Comm* c, int direction)
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{
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#ifdef _MPI
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switch (direction) {
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case LEFT:
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return c->coords[IDIM] == 0;
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break;
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case RIGHT:
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return c->coords[IDIM] == (c->dims[IDIM] - 1);
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break;
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case BOTTOM:
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return c->coords[JDIM] == 0;
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break;
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case TOP:
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return c->coords[JDIM] == (c->dims[JDIM] - 1);
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break;
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}
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#endif
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return 1;
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}
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void commExchange(Comm* c, double* grid)
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{
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#ifdef _MPI
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int counts[NDIRS] = { 1, 1, 1, 1 };
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MPI_Neighbor_alltoallw(grid,
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counts,
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c->sdispls,
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c->bufferTypes,
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grid,
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counts,
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c->rdispls,
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c->bufferTypes,
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c->comm);
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#endif
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}
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void commShift(Comm* c, double* f, double* g)
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{
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#ifdef _MPI
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MPI_Request requests[4] = { MPI_REQUEST_NULL,
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MPI_REQUEST_NULL,
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MPI_REQUEST_NULL,
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MPI_REQUEST_NULL };
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/* shift G */
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/* receive ghost cells from bottom neighbor */
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double* buf = g + 1;
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MPI_Irecv(buf,
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1,
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c->bufferTypes[BOTTOM],
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c->neighbours[BOTTOM],
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0,
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c->comm,
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&requests[0]);
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/* send ghost cells to top neighbor */
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buf = g + (c->jmaxLocal) * (c->imaxLocal + 2) + 1;
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MPI_Isend(buf, 1, c->bufferTypes[TOP], c->neighbours[TOP], 0, c->comm, &requests[1]);
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/* shift F */
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/* receive ghost cells from left neighbor */
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buf = f + (c->imaxLocal + 2);
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MPI_Irecv(buf,
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1,
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c->bufferTypes[LEFT],
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c->neighbours[LEFT],
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1,
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c->comm,
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&requests[2]);
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/* send ghost cells to right neighbor */
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buf = f + (c->imaxLocal + 2) + (c->imaxLocal);
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MPI_Isend(buf,
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1,
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c->bufferTypes[RIGHT],
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c->neighbours[RIGHT],
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1,
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c->comm,
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&requests[3]);
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MPI_Waitall(4, requests, MPI_STATUSES_IGNORE);
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#endif
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}
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void commCollectResult(Comm* c,
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double* ug,
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double* vg,
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double* pg,
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double* u,
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double* v,
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double* p,
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int imax,
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int jmax)
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{
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#ifdef _MPI
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/* collect P */
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assembleResult(c, p, pg, imax, jmax);
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/* collect U */
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assembleResult(c, u, ug, imax, jmax);
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/* collect V */
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assembleResult(c, v, vg, imax, jmax);
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#endif
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}
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void commPartition(Comm* c, int jmax, int imax)
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{
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#ifdef _MPI
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int dims[NDIMS] = { 0, 0 };
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int periods[NDIMS] = { 0, 0 };
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MPI_Dims_create(c->size, NDIMS, dims);
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MPI_Cart_create(MPI_COMM_WORLD, NDIMS, dims, periods, 0, &c->comm);
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MPI_Cart_shift(c->comm, IDIM, 1, &c->neighbours[LEFT], &c->neighbours[RIGHT]);
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MPI_Cart_shift(c->comm, JDIM, 1, &c->neighbours[BOTTOM], &c->neighbours[TOP]);
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MPI_Cart_get(c->comm, NDIMS, c->dims, periods, c->coords);
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c->imaxLocal = sizeOfRank(c->rank, dims[IDIM], imax);
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c->jmaxLocal = sizeOfRank(c->rank, dims[JDIM], jmax);
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MPI_Datatype jBufferType;
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MPI_Type_contiguous(c->imaxLocal, MPI_DOUBLE, &jBufferType);
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MPI_Type_commit(&jBufferType);
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MPI_Datatype iBufferType;
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MPI_Type_vector(c->jmaxLocal, 1, c->imaxLocal + 2, MPI_DOUBLE, &iBufferType);
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MPI_Type_commit(&iBufferType);
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// in the order of the dimensions i->0, j->1
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// first negative direction, then positive direction
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size_t dblsize = sizeof(double);
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int imaxLocal = c->imaxLocal;
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int jmaxLocal = c->jmaxLocal;
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c->bufferTypes[LEFT] = iBufferType;
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c->bufferTypes[RIGHT] = iBufferType;
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c->bufferTypes[BOTTOM] = jBufferType;
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c->bufferTypes[TOP] = jBufferType;
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c->sdispls[LEFT] = ((imaxLocal + 2) + 1) * dblsize; // send left
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c->sdispls[RIGHT] = ((imaxLocal + 2) + imaxLocal) * dblsize; // send right
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c->sdispls[BOTTOM] = ((imaxLocal + 2) + 1) * dblsize; // send bottom
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c->sdispls[TOP] = (jmaxLocal * (imaxLocal + 2) + 1) * dblsize; // send top
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c->rdispls[LEFT] = (imaxLocal + 2) * dblsize; // recv left
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c->rdispls[RIGHT] = ((imaxLocal + 2) + (imaxLocal + 1)) * dblsize; // recv right
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c->rdispls[BOTTOM] = 1 * dblsize; // recv bottom
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c->rdispls[TOP] = ((jmaxLocal + 1) * (imaxLocal + 2) + 1) * dblsize; // recv top
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#else
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c->imaxLocal = imax;
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c->jmaxLocal = jmax;
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#endif
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}
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