Tpetra Matrix/Vector Services Version of the Day
Tpetra_Util.cpp
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00004 //          Tpetra: Templated Linear Algebra Services Package
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00041 
00042 #include <Tpetra_Util.hpp>
00043 
00044 namespace Tpetra {
00045 namespace Details {
00046 
00064 bool
00065 congruent (const Teuchos::Comm<int>& comm1,
00066            const Teuchos::Comm<int>& comm2)
00067 {
00068 #ifdef HAVE_MPI
00069   using Teuchos::Comm;
00070   using Teuchos::RCP;
00071   using Teuchos::rcpFromRef;
00072   using Teuchos::MpiComm;
00073   using Teuchos::rcp_dynamic_cast;
00074 
00075   RCP<const MpiComm<int> > mpiComm1 =
00076     rcp_dynamic_cast<const MpiComm<int> > (rcpFromRef (comm1));
00077   RCP<const MpiComm<int> > mpiComm2 =
00078     rcp_dynamic_cast<const MpiComm<int> > (rcpFromRef (comm2));
00079 
00080   if (mpiComm1.is_null ()) { // comm1 is not an MpiComm
00081     return comm1.getSize () == comm2.getSize (); // hope for the best
00082   } else { // comm1 is an MpiComm
00083     if (mpiComm2.is_null ()) { // comm2 is not an MpiComm
00084       return comm1.getSize () == comm2.getSize (); // hope for the best
00085     } else { // both comm1 and comm2 are MpiComm
00086       MPI_Comm rawMpiComm1 = * (mpiComm1->getRawMpiComm ());
00087       MPI_Comm rawMpiComm2 = * (mpiComm2->getRawMpiComm ());
00088 
00089       int result = MPI_UNEQUAL;
00090       const int err = MPI_Comm_compare (rawMpiComm1, rawMpiComm2, &result);
00091       TEUCHOS_TEST_FOR_EXCEPTION(err != MPI_SUCCESS, std::runtime_error,
00092                                  "congruent: MPI_Comm_compare failed");
00093       return result == MPI_IDENT || result == MPI_CONGRUENT;
00094     }
00095   }
00096 #else // NOT HAVE_MPI
00097   return comm1.getSize () == comm2.getSize (); // hope for the best
00098 #endif // HAVE_MPI
00099 }
00100 
00101 } // namespace Details
00102 } // namespace Tpetra
00103 
00104 
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