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EpetraExt_RestrictedMultiVectorWrapper.cpp
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00001 /*
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00004 //
00005 //     EpetraExt: Epetra Extended - Linear Algebra Services Package
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00042 */
00043 
00044 #include "EpetraExt_ConfigDefs.h"
00045 
00046 
00047 #ifdef HAVE_MPI
00048 
00049 
00050 #include "EpetraExt_RestrictedMultiVectorWrapper.h"
00051 #include "Epetra_MpiComm.h"
00052 #include "Epetra_BlockMap.h"
00053 #include "Epetra_MultiVector.h"
00054 
00055 
00056 namespace EpetraExt {
00057 
00058 
00059 RestrictedMultiVectorWrapper::RestrictedMultiVectorWrapper()
00060   : proc_is_active(true),
00061     subcomm_is_set(false),
00062     RestrictedComm_(0),
00063     MPI_SubComm_(MPI_COMM_NULL),
00064     ResMap_(0),
00065     input_mv_(),
00066     restricted_mv_()  
00067     {}
00068 
00069 
00070 RestrictedMultiVectorWrapper::~RestrictedMultiVectorWrapper(){
00071   delete ResMap_;
00072   delete RestrictedComm_;
00073 }
00074 
00075 
00076 int RestrictedMultiVectorWrapper::SetMPISubComm(MPI_Comm MPI_SubComm){
00077   if(!subcomm_is_set){
00078     MPI_SubComm_=MPI_SubComm; delete RestrictedComm_; subcomm_is_set=true;
00079     return 0;
00080   }
00081   else return -1;
00082 }
00083 
00084 
00085 int RestrictedMultiVectorWrapper::restrict_comm(Teuchos::RCP<Epetra_MultiVector> input_mv){
00086  input_mv_=input_mv;
00087 
00088   /* Pull the Input Matrix Info */
00089   const Epetra_MpiComm *InComm = dynamic_cast<const Epetra_MpiComm*>(& input_mv_->Comm());
00090   const Epetra_BlockMap *InMap = dynamic_cast<const Epetra_BlockMap*>(& input_mv_->Map());
00091 
00092   if(!InComm || !InMap) return -1;
00093   
00094   if(!subcomm_is_set){
00095     /* Build the Split Communicators, If Needed */
00096     int color;
00097     if(InMap->NumMyElements()) color=1;
00098     else color=MPI_UNDEFINED;
00099     MPI_Comm_split(InComm->Comm(),color,InComm->MyPID(),&MPI_SubComm_);
00100   }
00101   else{
00102     /* Sanity check user-provided subcomm - drop an error if the MPISubComm
00103        does not include a processor with data. */
00104     if (input_mv->MyLength() && MPI_SubComm_ == MPI_COMM_NULL)
00105       return(-2);
00106   }
00107 
00108   /* Mark active processors */
00109   if(MPI_SubComm_ == MPI_COMM_NULL) proc_is_active=false;
00110   else proc_is_active=true;
00111 
00112   
00113   int Nrows=InMap->NumGlobalElements();
00114       
00115   if(proc_is_active){      
00116     RestrictedComm_=new Epetra_MpiComm(MPI_SubComm_);
00117     
00118     /* Build the Restricted Maps */
00119     ResMap_ = new Epetra_BlockMap(Nrows,InMap->NumMyElements(),InMap->MyGlobalElements(),
00120                                   InMap->ElementSizeList(),InMap->IndexBase(),*RestrictedComm_);
00121 
00122     /* Allocate the restricted matrix*/
00123     double *A; int LDA;
00124     input_mv_->ExtractView(&A,&LDA);
00125     restricted_mv_ = Teuchos::rcp(new Epetra_MultiVector(View,*ResMap_,A,LDA,input_mv_->NumVectors()));
00126   }
00127 
00128   return 0;
00129 }/*end restrict_comm*/
00130 
00131 }
00132   
00133 #endif
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