Thyra_SpmdVectorSpaceUtilities.cpp

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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
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00011 // it under the terms of the GNU Lesser General Public License as
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00028 
00029 #include "Thyra_SpmdVectorSpaceUtilities.hpp"
00030 #include "Teuchos_CommHelpers.hpp"
00031 
00032 namespace Thyra {
00033 
00034 Index SpmdVectorSpaceUtilities::computeMapCode(
00035   const Teuchos::Comm<Index> &comm, const Index localSubDim
00036   )
00037 {
00038   //
00039   // Here we will make a map code out of just the local
00040   // sub-dimension on each processor.  If each processor
00041   // has the same number of local elements, then the maps
00042   // will be the same and this is all you need for
00043   // RTOp compatibility unless the operations are not
00044   // coordinate invariant.  I will work on this issue
00045   // if it becomes a problem.
00046   //
00047   const int procRank = size(comm);
00048   Index mapCode = -1;
00049   Index localCode = localSubDim % (procRank+1) + localSubDim;
00050   reduceAll(comm,Teuchos::REDUCE_SUM,localCode,&mapCode);
00051   return mapCode;
00052 }
00053 
00054 Index SpmdVectorSpaceUtilities::computeLocalOffset(
00055   const Teuchos::Comm<Index> &comm, const Index localSubDim
00056   )
00057 {
00058   Index localOffset;
00059   Index _localOffset = localSubDim;
00060   scan(comm,Teuchos::REDUCE_SUM,_localOffset,&localOffset);
00061   localOffset -= localSubDim;
00062   return localOffset;
00063 }
00064 
00065 Index SpmdVectorSpaceUtilities::computeGlobalDim(
00066   const Teuchos::Comm<Index> &comm, const Index localSubDim
00067   )
00068 {
00069   Index globalDim = -1;
00070   reduceAll(comm,Teuchos::REDUCE_SUM,localSubDim,&globalDim);
00071   return globalDim;
00072 }
00073 
00074 } // namespace Thyra

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