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/*****************************************************************************
** FILE IDENTIFICATION
**
** Name: mpiworld.cpp
** Purpose: MPI Support class
** Programmer: Kevin Rosenberg
** Date Started: June 2000
**
** This is part of the CTSim program
** Copyright (C) 1983-2009 Kevin Rosenberg
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License (version 2) as
** published by the Free Software Foundation.
**
** 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, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
******************************************************************************/
#include <mpi++.h>
#include <mpiworld.h>
MPIWorld::MPIWorld (int& argc, char* const *& argv)
{
MPI::Init (argc, const_cast<char**&>(argv));
m_comm = MPI::COMM_WORLD.Dup();
m_nProcessors = m_comm.Get_size();
m_myRank = m_comm.Get_rank();
m_vLocalWorkUnits.reserve (m_nProcessors);
m_vStartWorkUnit.reserve (m_nProcessors);
m_vEndWorkUnit.reserve (m_nProcessors);
}
void
MPIWorld::setTotalWorkUnits(int totalWorkUnits)
{
if (m_nProcessors < 1)
return;
int baseLocalWorkUnits = totalWorkUnits / m_nProcessors;
int remainderWorkUnits = totalWorkUnits % m_nProcessors;
int currWorkUnits = 0;
for (int iProc = 0; iProc < m_nProcessors; iProc++) {
m_vLocalWorkUnits[iProc] = baseLocalWorkUnits;
if (iProc < remainderWorkUnits)
m_vLocalWorkUnits[iProc]++;
m_vStartWorkUnit[iProc] = currWorkUnits;
m_vEndWorkUnit[iProc] = m_vStartWorkUnit[iProc] + m_vLocalWorkUnits[iProc] - 1;
currWorkUnits += m_vLocalWorkUnits[iProc];
}
}
void
MPIWorld::BcastString (string& str)
{
int len;
if (m_myRank == 0)
len = str.length();
m_comm.Bcast (&len, 1, MPI::INT, 0);
char buf [ len + 1];
if (m_myRank == 0)
strcpy (buf, str.c_str());
m_comm.Bcast (buf, len + 1, MPI::CHAR, 0);
if (m_myRank > 0)
str = buf;
}
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