r90: Convert MPI structure to C++ class

[ctsim.git] / src / mpiworld.cpp

diff --git a/src/mpiworld.cpp b/src/mpiworld.cpp
new file mode 100644 (file)
index 0000000..f5631f1
--- /dev/null
+++ b/src/mpiworld.cpp
@@ -0,0 +1,66 @@
+/*****************************************************************************
+** 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) 1983-2000 Kevin Rosenberg
+**
+**  $Id: mpiworld.cpp,v 1.1 2000/06/09 01:35:33 kevin Exp $
+**
+**  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**& argv)
+{
+  MPI::Init (argc, 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];
+  }
+  
+}
+