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/*
* Copyright (C) 2011 Thorsten Liebig (Thorsten.Liebig@gmx.de)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY{} without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "engine_mpi.h"
Engine_MPI* Engine_MPI::New(const Operator_MPI* op)
{
cout << "Create FDTD engine (compressed SSE + MPI)" << endl;
Engine_MPI* e = new Engine_MPI(op);
e->Init();
return e;
}
Engine_MPI::Engine_MPI(const Operator_MPI* op) : Engine_SSE_Compressed(op)
{
m_Op_MPI = op;
}
Engine_MPI::~Engine_MPI()
{
Reset();
}
void Engine_MPI::Init()
{
Engine_SSE_Compressed::Init();
for (int i=0;i<3;++i)
{
m_BufferUp[i]=NULL;
m_BufferDown[i]=NULL;
m_BufferSize[i]=0;
}
if (m_Op_MPI->GetMPIEnabled())
{
// init buffers, nx*ny*2 for the tangential electric or magnetic fields at the interface
for (int n=0;n<3;++n)
{
int nP = (n+1)%3;
int nPP = (n+2)%3;
m_BufferSize[n] = m_Op_MPI->numLines[nP]*m_Op_MPI->numLines[nPP];
if (m_Op_MPI->m_NeighborDown[n]>=0)
{
m_BufferDown[n] = new float[m_BufferSize[n]*2];
}
if (m_Op_MPI->m_NeighborUp[n]>=0)
{
m_BufferUp[n] = new float[m_BufferSize[n]*2];
}
}
}
}
void Engine_MPI::Reset()
{
for (int i=0;i<3;++i)
{
delete[] m_BufferUp[i];
delete[] m_BufferDown[i];
m_BufferUp[i]=NULL;
m_BufferDown[i]=NULL;
m_BufferSize[i]=0;
}
Engine_SSE_Compressed::Reset();
}
void Engine_MPI::SendReceiveVoltages()
{
unsigned int pos[3];
//non-blocking prepare for receive...
for (int n=0;n<3;++n)
if (m_Op_MPI->m_NeighborDown[n]>=0)
MPI_Irecv( m_BufferDown[n] , m_BufferSize[n]*2, MPI_FLOAT, m_Op_MPI->m_NeighborDown[n], m_Op_MPI->m_MyTag, MPI_COMM_WORLD, &Recv_Request[n]);
for (int n=0;n<3;++n)
{
int nP = (n+1)%3;
int nPP = (n+2)%3;
//send voltages
unsigned int iPos=0;
pos[n]=numLines[n]-2;
if (m_Op_MPI->m_NeighborUp[n]>=0)
{
for (pos[nP]=0; pos[nP]<numLines[nP]; ++pos[nP])
{
for (pos[nPP]=0; pos[nPP]<numLines[nPP]; ++pos[nPP])
{
m_BufferUp[n][iPos++] = Engine_SSE_Compressed::GetVolt(nP ,pos);
m_BufferUp[n][iPos++] = Engine_SSE_Compressed::GetVolt(nPP,pos);
}
}
MPI_Isend( m_BufferUp[n] , m_BufferSize[n]*2, MPI_FLOAT, m_Op_MPI->m_NeighborUp[n], m_Op_MPI->m_MyTag, MPI_COMM_WORLD, &Send_Request[n]);
}
//receive voltages
pos[n]=0;
iPos=0;
if (m_Op_MPI->m_NeighborDown[n]>=0)
{
//wait for receive to finish...
MPI_Wait(&Recv_Request[n],&stat);
for (pos[nP]=0; pos[nP]<numLines[nP]; ++pos[nP])
{
for (pos[nPP]=0; pos[nPP]<numLines[nPP]; ++pos[nPP])
{
Engine_SSE_Compressed::SetVolt(nP ,pos,m_BufferDown[n][iPos++]);
Engine_SSE_Compressed::SetVolt(nPP,pos,m_BufferDown[n][iPos++]);
}
}
}
}
}
void Engine_MPI::SendReceiveCurrents()
{
unsigned int pos[3];
//non-blocking prepare for receive...
for (int n=0;n<3;++n)
if (m_Op_MPI->m_NeighborUp[n]>=0)
MPI_Irecv( m_BufferUp[n] , m_BufferSize[n]*2, MPI_FLOAT, m_Op_MPI->m_NeighborUp[n], m_Op_MPI->m_MyTag, MPI_COMM_WORLD, &Recv_Request[n]);
for (int n=0;n<3;++n)
{
int nP = (n+1)%3;
int nPP = (n+2)%3;
//send currents
unsigned int iPos=0;
pos[n]=0;
if (m_Op_MPI->m_NeighborDown[n]>=0)
{
for (pos[nP]=0; pos[nP]<numLines[nP]; ++pos[nP])
{
for (pos[nPP]=0; pos[nPP]<numLines[nPP]; ++pos[nPP])
{
m_BufferDown[n][iPos++] = Engine_SSE_Compressed::GetCurr(nP ,pos);
m_BufferDown[n][iPos++] = Engine_SSE_Compressed::GetCurr(nPP,pos);
}
}
MPI_Isend( m_BufferDown[n] , m_BufferSize[n]*2, MPI_FLOAT, m_Op_MPI->m_NeighborDown[n], m_Op_MPI->m_MyTag, MPI_COMM_WORLD, &Send_Request[n]);
}
//receive currents
pos[n]=numLines[n]-2;
iPos=0;
if (m_Op_MPI->m_NeighborUp[n]>=0)
{
//wait for receive to finish...
MPI_Wait(&Recv_Request[n],&stat);
for (pos[nP]=0; pos[nP]<numLines[nP]; ++pos[nP])
{
for (pos[nPP]=0; pos[nPP]<numLines[nPP]; ++pos[nPP])
{
Engine_SSE_Compressed::SetCurr(nP ,pos,m_BufferUp[n][iPos++]);
Engine_SSE_Compressed::SetCurr(nPP,pos,m_BufferUp[n][iPos++]);
}
}
}
}
}
bool Engine_MPI::IterateTS(unsigned int iterTS)
{
if (!m_Op_MPI->GetMPIEnabled())
{
return Engine_SSE_Compressed::IterateTS(iterTS);
}
for (unsigned int iter=0; iter<iterTS; ++iter)
{
//voltage updates with extensions
DoPreVoltageUpdates();
UpdateVoltages(0,numLines[0]);
DoPostVoltageUpdates();
Apply2Voltages();
SendReceiveVoltages();
//current updates with extensions
DoPreCurrentUpdates();
UpdateCurrents(0,numLines[0]-1);
DoPostCurrentUpdates();
Apply2Current();
SendReceiveCurrents();
++numTS;
}
return true;
}
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