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EpetraExt_RestrictedMultiVectorWrapper.cpp
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00001 /*
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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     MPI_SubComm_(MPI_COMM_NULL),
00063     RestrictedComm_(0),
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 
00086 RestrictedMultiVectorWrapper::
00087 restrict_comm (Teuchos::RCP<Epetra_MultiVector> input_mv)
00088 {
00089   using Teuchos::rcp;
00090   input_mv_ = input_mv;
00091 
00092   // Extract the input MV's communicator and Map.
00093   const Epetra_MpiComm *InComm = 
00094     dynamic_cast<const Epetra_MpiComm*> (& (input_mv_->Comm ()));
00095   const Epetra_BlockMap *InMap = 
00096     dynamic_cast<const Epetra_BlockMap*> (& (input_mv_->Map ()));
00097 
00098   if (! InComm || ! InMap) {
00099     return -1; // At least one dynamic cast failed.
00100   }
00101   
00102   if (! subcomm_is_set) {
00103     /* Build the Split Communicators, If Needed */
00104     int color;
00105     if (InMap->NumMyElements()) {
00106       color = 1;
00107     }
00108     else {
00109       color = MPI_UNDEFINED;
00110     }
00111     const int err = 
00112       MPI_Comm_split (InComm->Comm(), color, InComm->MyPID(), &MPI_SubComm_);
00113     if (err != MPI_SUCCESS) {
00114       return -2;
00115     }
00116   }
00117   else {
00118     /* Sanity check user-provided subcomm - drop an error if the MPISubComm
00119        does not include a processor with data. */
00120     if (input_mv->MyLength() && MPI_SubComm_ == MPI_COMM_NULL) {
00121       return -2;
00122     }
00123   }
00124 
00125   /* Mark active processors */
00126   if (MPI_SubComm_ == MPI_COMM_NULL) {
00127     proc_is_active = false;
00128   }
00129   else {
00130     proc_is_active = true;
00131   }
00132   
00133   int Nrows = InMap->NumGlobalElements ();
00134       
00135   if (proc_is_active) {      
00136     RestrictedComm_ = new Epetra_MpiComm (MPI_SubComm_);
00137     
00138     // Build the restricted Maps
00139     ResMap_ = new Epetra_BlockMap (Nrows, InMap->NumMyElements(), 
00140            InMap->MyGlobalElements(),
00141            InMap->ElementSizeList(),
00142            InMap->IndexBase(), *RestrictedComm_);
00143     // Allocate the restricted matrix
00144     double *A; 
00145     int LDA;
00146     input_mv_->ExtractView (&A,&LDA);
00147     restricted_mv_ = rcp (new Epetra_MultiVector (View, *ResMap_, A, LDA, 
00148               input_mv_->NumVectors ()));
00149   }
00150   return 0; // Success!
00151 }/*end restrict_comm*/
00152 
00153 }
00154   
00155 #endif
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