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// Gmsh - Copyright (C) 1997-2021 C. Geuzaine, J.-F. Remacle
//
// See the LICENSE.txt file for license information. Please report all
// issues on https://gitlab.onelab.info/gmsh/gmsh/issues.
#include "GmshConfig.h"
#ifdef HAVE_MPI
#include "mpi.h"
#endif
#include <dofManager.h>
template <> void dofManager<double>::scatterSolution()
{
#ifdef HAVE_MPI
if(!_parallelFinalized) {
_parallelFinalize();
}
MPI_Status status;
std::vector<std::vector<double> > sendBuf(Msg::GetCommSize()),
recvBuf(Msg::GetCommSize());
std::vector<MPI_Request> reqRecv(Msg::GetCommSize()),
reqSend(Msg::GetCommSize());
for(int i = 0; i < Msg::GetCommSize(); i++) {
reqRecv[i] = reqSend[i] = MPI_REQUEST_NULL;
if(!ghostByProc[i].empty()) {
recvBuf[i].resize(ghostByProc[i].size());
MPI_Irecv(&recvBuf[i][0], recvBuf[i].size(), MPI_DOUBLE, i, 0,
MPI_COMM_WORLD, &reqRecv[i]);
}
if(!parentByProc[i].empty()) {
getDofValue(parentByProc[i], sendBuf[i]);
MPI_Isend(&sendBuf[i][0], sendBuf[i].size(), MPI_DOUBLE, i, 0,
MPI_COMM_WORLD, &reqSend[i]);
}
}
int index;
while(MPI_Waitany(Msg::GetCommSize(), &reqRecv[0], &index, &status) == 0 &&
index != MPI_UNDEFINED) {
if(status.MPI_TAG == 0)
for(std::size_t j = 0; j < recvBuf[index].size(); j++) {
ghostValue[ghostByProc[index][j]] = recvBuf[index][j];
// const Dof &dof = ghostByProc[index][j];
}
}
MPI_Waitall(Msg::GetCommSize(), &reqSend[0], MPI_STATUS_IGNORE);
#endif
}
void dofManagerBase::_parallelFinalize()
{
_localSize = unknown.size();
#ifdef HAVE_MPI
int numStart;
int numTotal;
MPI_Status status;
parentByProc.resize(Msg::GetCommSize());
ghostByProc.resize(Msg::GetCommSize());
if(Msg::GetCommRank() == 0) {
numStart = 0;
}
else
MPI_Recv(&numStart, 1, MPI_INT, Msg::GetCommRank() - 1, 0, MPI_COMM_WORLD,
&status);
numTotal = numStart + _localSize;
if(Msg::GetCommRank() != Msg::GetCommSize() - 1)
MPI_Send(&numTotal, 1, MPI_INT, Msg::GetCommRank() + 1, 0, MPI_COMM_WORLD);
MPI_Bcast(&numTotal, 1, MPI_INT, Msg::GetCommSize() - 1, MPI_COMM_WORLD);
for(auto it = unknown.begin(); it != unknown.end(); it++)
it->second += numStart;
std::vector<std::list<Dof> > ghostedByProc;
int *nRequest = new int[Msg::GetCommSize()];
int *nRequested = new int[Msg::GetCommSize()];
for(int i = 0; i < Msg::GetCommSize(); i++) nRequest[i] = 0;
for(auto it = ghostByDof.begin(); it != ghostByDof.end(); it++) {
int procId = it->second.first;
it->second.second = nRequest[procId]++;
}
MPI_Alltoall(nRequest, 1, MPI_INT, nRequested, 1, MPI_INT, MPI_COMM_WORLD);
long int **recv0 = new long int *[Msg::GetCommSize()];
int **recv1 = new int *[Msg::GetCommSize()];
long int **send0 = new long int *[Msg::GetCommSize()];
int **send1 = new int *[Msg::GetCommSize()];
MPI_Request *reqRecv0 = new MPI_Request[2 * Msg::GetCommSize()];
MPI_Request *reqRecv1 = reqRecv0 + Msg::GetCommSize();
MPI_Request *reqSend0 = new MPI_Request[Msg::GetCommSize()];
MPI_Request *reqSend1 = new MPI_Request[Msg::GetCommSize()];
for(int i = 0; i < Msg::GetCommSize(); i++) {
send0[i] = new long int[nRequest[i] * 2];
recv0[i] = new long int[nRequested[i] * 2];
send1[i] = new int[nRequested[i]];
recv1[i] = new int[nRequest[i]];
reqSend0[i] = reqSend1[i] = reqRecv0[i] = reqRecv1[i] = MPI_REQUEST_NULL;
parentByProc[i].resize(nRequested[i], Dof(0, 0));
ghostByProc[i].resize(nRequest[i], Dof(0, 0));
}
for(int i = 0; i < Msg::GetCommSize(); i++) nRequest[i] = 0;
for(auto it = ghostByDof.begin(); it != ghostByDof.end(); it++) {
int proc = it->second.first;
send0[proc][nRequest[proc] * 2] = it->first.getEntity();
send0[proc][nRequest[proc] * 2 + 1] = it->first.getType();
ghostByProc[proc][nRequest[proc]] = it->first;
nRequest[proc]++;
}
for(int i = 0; i < Msg::GetCommSize(); i++) {
if(nRequested[i] > 0) {
MPI_Irecv(recv0[i], 2 * nRequested[i], MPI_LONG, i, 0, MPI_COMM_WORLD,
&reqRecv0[i]);
}
if(nRequest[i] > 0) {
MPI_Irecv(recv1[i], 2 * nRequest[i], MPI_INT, i, 1, MPI_COMM_WORLD,
&reqRecv1[i]);
MPI_Isend(send0[i], 2 * nRequest[i], MPI_LONG, i, 0, MPI_COMM_WORLD,
&reqSend0[i]);
}
}
int index;
while(MPI_Waitany(2 * Msg::GetCommSize(), reqRecv0, &index, &status) == 0 &&
index != MPI_UNDEFINED) {
if(status.MPI_TAG == 0) {
for(int j = 0; j < nRequested[index]; j++) {
Dof d(recv0[index][j * 2], recv0[index][j * 2 + 1]);
auto it = unknown.find(d);
if(it == unknown.end())
Msg::Error("ghost Dof does not exist on parent process");
send1[index][j] = it->second;
parentByProc[index][j] = d;
}
MPI_Isend(send1[index], nRequested[index], MPI_INT, index, 1,
MPI_COMM_WORLD, &reqSend1[index]);
}
}
for(int i = 0; i < Msg::GetCommSize(); i++)
for(int i = 0; i < Msg::GetCommSize(); i++) nRequest[i] = 0;
for(auto it = ghostByDof.begin(); it != ghostByDof.end(); it++) {
int proc = it->second.first;
unknown[it->first] = recv1[proc][nRequest[proc]++];
}
MPI_Waitall(Msg::GetCommSize(), reqSend0, MPI_STATUS_IGNORE);
MPI_Waitall(Msg::GetCommSize(), reqSend1, MPI_STATUS_IGNORE);
for(int i = 0; i < Msg::GetCommSize(); i++) {
delete[] send0[i];
delete[] send1[i];
delete[] recv0[i];
delete[] recv1[i];
}
delete[] send0;
delete[] send1;
delete[] recv0;
delete[] recv1;
delete[] reqSend0;
delete[] reqSend1;
delete[] reqRecv0;
#endif
_parallelFinalized = true;
}
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