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Thyra_SpmdVectorSpaceUtilities.cpp
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00001 // @HEADER
00002 // ***********************************************************************
00003 // 
00004 //    Thyra: Interfaces and Support for Abstract Numerical Algorithms
00005 //                 Copyright (2004) Sandia Corporation
00006 // 
00007 // Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
00008 // license for use of this work by or on behalf of the U.S. Government.
00009 // 
00010 // This library is free software; you can redistribute it and/or modify
00011 // it under the terms of the GNU Lesser General Public License as
00012 // published by the Free Software Foundation; either version 2.1 of the
00013 // License, or (at your option) any later version.
00014 //  
00015 // This library is distributed in the hope that it will be useful, but
00016 // WITHOUT ANY WARRANTY; without even the implied warranty of
00017 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00018 // Lesser General Public License for more details.
00019 //  
00020 // You should have received a copy of the GNU Lesser General Public
00021 // License along with this library; if not, write to the Free Software
00022 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
00023 // USA
00024 // Questions? Contact Michael A. Heroux (maherou@sandia.gov) 
00025 // 
00026 // ***********************************************************************
00027 // @HEADER
00028 
00029 #include "Thyra_SpmdVectorSpaceUtilities.hpp"
00030 #include "Teuchos_CommHelpers.hpp"
00031 
00032 
00033 namespace Thyra {
00034 
00035 
00036 Ordinal SpmdVectorSpaceUtilities::computeMapCode(
00037   const Teuchos::Comm<Ordinal> &comm, const Ordinal localSubDim
00038   )
00039 {
00040   //
00041   // Here we will make a map code out of just the local sub-dimension on each
00042   // processor.  If each processor has the same number of local elements, then
00043   // the map codes will be the same and this is all you need for RTOp
00044   // compatibility.
00045   //
00046   const int procRank = size(comm);
00047   Ordinal mapCode = -1;
00048   Ordinal localCode = localSubDim % (procRank+1) + localSubDim;
00049   reduceAll(comm, Teuchos::REDUCE_SUM, localCode,
00050     Teuchos::outArg(mapCode));
00051   return mapCode;
00052 }
00053 
00054 
00055 Ordinal SpmdVectorSpaceUtilities::computeLocalOffset(
00056   const Teuchos::Comm<Ordinal> &comm, const Ordinal localSubDim
00057   )
00058 {
00059   Ordinal localOffset;
00060   const Ordinal _localOffset = localSubDim;
00061   scan(comm, Teuchos::REDUCE_SUM, _localOffset, 
00062     Teuchos::outArg(localOffset));
00063   localOffset -= localSubDim;
00064   return localOffset;
00065 }
00066 
00067 
00068 Ordinal SpmdVectorSpaceUtilities::computeGlobalDim(
00069   const Teuchos::Comm<Ordinal> &comm, const Ordinal localSubDim
00070   )
00071 {
00072   Ordinal globalDim = -1;
00073   reduceAll(comm, Teuchos::REDUCE_SUM, localSubDim,
00074     Teuchos::outArg(globalDim));
00075   return globalDim;
00076 }
00077 
00078 
00079 } // namespace Thyra
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