166 lines
3.9 KiB
C++
166 lines
3.9 KiB
C++
/*
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* Copyright (C) 2011 Thorsten Liebig (Thorsten.Liebig@gmx.de)
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY{} without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "operator_mpi.h"
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#include "operator_sse_compressed.h"
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#include "engine_sse_compressed.h"
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#include "engine_mpi.h"
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#include "tools/array_ops.h"
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#include "tools/useful.h"
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#include "mpi.h"
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Operator_MPI* Operator_MPI::New()
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{
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cout << "Create FDTD operator (compressed SSE + MPI)" << endl;
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Operator_MPI* op = new Operator_MPI();
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op->Init();
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return op;
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}
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Operator_MPI::Operator_MPI() : Operator_SSE_Compressed()
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{
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m_NumProc = MPI::COMM_WORLD.Get_size();
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//enabled only if more than one process is active
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m_MPI_Enabled = m_NumProc>0;
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}
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Operator_MPI::~Operator_MPI()
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{
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Delete();
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}
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bool Operator_MPI::SetGeometryCSX(ContinuousStructure* geo)
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{
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//manipulate geometry for this part...
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if (m_MPI_Enabled)
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{
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CSRectGrid* grid = geo->GetGrid();
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int nz = grid->GetQtyLines(2);
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std::vector<unsigned int> jobs = AssignJobs2Threads(nz, m_NumProc);
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double z_lines[jobs.at(m_MyID)];
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unsigned int z_start=0;
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for (int n=0;n<m_MyID;++n)
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z_start+=jobs.at(n);
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for (unsigned int n=0;n<jobs.at(m_MyID);++n)
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z_lines[n] = grid->GetLine(2,z_start+n);
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grid->ClearLines(2);
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grid->AddDiscLines(2,jobs.at(m_MyID),z_lines);
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//lower neighbor is ID-1
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if (m_MyID>0)
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m_NeighborDown[2]=m_MyID-1;
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//upper neighbor is ID+1
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if (m_MyID<m_NumProc-1)
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m_NeighborUp[2]=m_MyID+1;
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}
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else
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cerr << "Operator_MPI::SetGeometryCSX: Warning: Number of MPI processes is 1, skipping MPI engine... " << endl;
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return Operator_SSE_Compressed::SetGeometryCSX(geo);
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}
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double Operator_MPI::CalcTimestep()
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{
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double ret = Operator::CalcTimestep();
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if (!m_MPI_Enabled)
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return ret;
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double local_dT = dT;
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//find the smallest time-step requestes by all processings
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MPI_Reduce(&local_dT, &dT, 1, MPI_DOUBLE, MPI_MIN, 0, MPI_COMM_WORLD);
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//send the smallest time-step to all
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MPI_Bcast(&dT, 1, MPI_DOUBLE, 0, MPI_COMM_WORLD);
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return ret;
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}
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void Operator_MPI::SetBoundaryCondition(int* BCs)
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{
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if (!m_MPI_Enabled)
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return Operator_SSE_Compressed::SetBoundaryCondition(BCs);
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//set boundary conditions on MPI interfaces to PEC, ApplyElectricBC will handle proper interface handling...
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for (int n=0;n<3;++n)
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{
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if (m_NeighborUp[n]>=0)
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BCs[2*n+1] = 0;
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if (m_NeighborDown[n]>=0)
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BCs[2*n] = 0;
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}
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Operator_SSE_Compressed::SetBoundaryCondition(BCs);
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}
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void Operator_MPI::ApplyElectricBC(bool* dirs)
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{
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if (!m_MPI_Enabled)
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return Operator_SSE_Compressed::ApplyElectricBC(dirs);
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for (int n=0;n<3;++n)
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{
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//do not delete operator at upper inteface
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if (m_NeighborUp[n]>=0)
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dirs[2*n+1] = false;
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}
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Operator_SSE_Compressed::ApplyElectricBC(dirs);
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}
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Engine* Operator_MPI::CreateEngine() const
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{
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if (m_MPI_Enabled)
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return Engine_MPI::New(this);
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else
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return Engine_SSE_Compressed::New(this);
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}
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void Operator_MPI::Init()
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{
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Operator_SSE_Compressed::Init();
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m_MyTag = 0;
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for (int i=0;i<3;++i)
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{
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m_NeighborUp[i]=-1;
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m_NeighborDown[i]=-1;
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}
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int namelen;
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m_NumProc = MPI::COMM_WORLD.Get_size();
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m_MyID = MPI::COMM_WORLD.Get_rank();
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m_Processor_Name = new char[MPI_MAX_PROCESSOR_NAME];
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MPI::Get_processor_name(m_Processor_Name,namelen);
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if (m_MPI_Enabled)
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cerr << "Operator_MPI::Init(): Running on " << m_Processor_Name << endl;
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}
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void Operator_MPI::Delete()
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{
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delete[] m_Processor_Name;
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}
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void Operator_MPI::Reset()
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{
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Delete();
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Operator_SSE_Compressed::Reset();
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}
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