From: bangerth Date: Wed, 2 Jan 2013 16:59:56 +0000 (+0000) Subject: Patch by Fahad Alrashed: Overload PETScWrappers::MPI::Vector::print to make sure... X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e0d0d5af2dac608b51e2ceb24eb6ae096de16738;p=dealii-svn.git Patch by Fahad Alrashed: Overload PETScWrappers::MPI::Vector::print to make sure the right thing happens in parallel. git-svn-id: https://svn.dealii.org/trunk@27897 0785d39b-7218-0410-832d-ea1e28bc413d --- diff --git a/deal.II/doc/news/changes.h b/deal.II/doc/news/changes.h index 486e97a696..2c4dd85bec 100644 --- a/deal.II/doc/news/changes.h +++ b/deal.II/doc/news/changes.h @@ -127,6 +127,12 @@ DoFHandler, in particular removal of specializations.

Specific improvements

    +
  1. New: The PETScWrappers::MPI::Vector::print function overloads the +function of same name in the base class to ensure that the output +generated by a parallel vector makes sense. +
    +(Fahad Alrashed, 2013/1/2) +
  2. New: The PETScWrappers::VectorBase class now has a function PETScWrappers::VectorBase::write_ascii() that allows writing the vector's data to the default output stream. diff --git a/deal.II/include/deal.II/lac/petsc_parallel_vector.h b/deal.II/include/deal.II/lac/petsc_parallel_vector.h index 00246610f3..bea148060f 100644 --- a/deal.II/include/deal.II/lac/petsc_parallel_vector.h +++ b/deal.II/include/deal.II/lac/petsc_parallel_vector.h @@ -1,7 +1,7 @@ //--------------------------------------------------------------------------- // $Id$ // -// Copyright (C) 2004, 2005, 2006, 2007, 2009, 2010, 2012 by the deal.II authors +// Copyright (C) 2004, 2005, 2006, 2007, 2009, 2010, 2012, 2013 by the deal.II authors // // This file is subject to QPL and may not be distributed // without copyright and license information. Please refer @@ -391,6 +391,30 @@ namespace PETScWrappers */ const MPI_Comm &get_mpi_communicator () const; + /** + * Print to a + * stream. @p precision denotes + * the desired precision with + * which values shall be printed, + * @p scientific whether + * scientific notation shall be + * used. If @p across is + * @p true then the vector is + * printed in a line, while if + * @p false then the elements + * are printed on a separate line + * each. + * + * @note This function overloads the one in the + * base class to ensure that the right thing happens + * for parallel vectors that are distributed across + * processors. + */ + void print (std::ostream &out, + const unsigned int precision = 3, + const bool scientific = true, + const bool across = true) const; + protected: /** * Create a vector of length diff --git a/deal.II/source/lac/petsc_parallel_vector.cc b/deal.II/source/lac/petsc_parallel_vector.cc index 225c1ebda1..612be27193 100644 --- a/deal.II/source/lac/petsc_parallel_vector.cc +++ b/deal.II/source/lac/petsc_parallel_vector.cc @@ -2,7 +2,7 @@ // $Id$ // Version: $Name$ // -// Copyright (C) 2004, 2006, 2008, 2009, 2010, 2011, 2012 by the deal.II authors +// Copyright (C) 2004, 2006, 2008, 2009, 2010, 2011, 2012, 2013 by the deal.II authors // // This file is subject to QPL and may not be distributed // without copyright and license information. Please refer @@ -286,6 +286,76 @@ namespace PETScWrappers + void + Vector::print (std::ostream &out, + const unsigned int precision, + const bool scientific, + const bool across) const + { + AssertThrow (out, ExcIO()); + + // get a representation of the vector and + // loop over all the elements + PetscScalar *val; + PetscInt nlocal, istart, iend; + + int ierr = VecGetArray (vector, &val); + + AssertThrow (ierr == 0, ExcPETScError(ierr)); + + ierr = VecGetLocalSize (vector, &nlocal); + + AssertThrow (ierr == 0, ExcPETScError(ierr)); + + ierr = VecGetOwnershipRange (vector, &istart, &iend); + + AssertThrow (ierr == 0, ExcPETScError(ierr)); + + // save the state of out stream + std::ios::fmtflags old_flags = out.flags(); + unsigned int old_precision = out.precision (precision); + + out.precision (precision); + if (scientific) + out.setf (std::ios::scientific, std::ios::floatfield); + else + out.setf (std::ios::fixed, std::ios::floatfield); + + for ( unsigned int i = 0; + i < Utilities::MPI::n_mpi_processes(communicator); + i++) + { + // This is slow, but most likely only used to debug. + MPI_Barrier(communicator); + if (i == Utilities::MPI::this_mpi_process(communicator)) + { + if (across) + { + out << "[Proc" << i << " " << istart << "-" << iend-1 << "]" << ' '; + for (PetscInt i=0; i