Tpetra_Details_initializeKokkos.cpp

// @HEADER
// ***********************************************************************
//
//          Tpetra: Templated Linear Algebra Services Package
//                 Copyright (2008) Sandia Corporation
//
// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
// the U.S. Government retains certain rights in this software.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// 3. Neither the name of the Corporation nor the names of the
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SANDIA CORPORATION OR THE
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Questions? Contact Michael A. Heroux (maherou@sandia.gov)
//
// ************************************************************************
// @HEADER
 
#include "Tpetra_Details_initializeKokkos.hpp"
#include "Teuchos_GlobalMPISession.hpp"
#include "Kokkos_Core.hpp"
#include <cstdlib> // std::atexit
#include <string>
#include <vector>
 
namespace Tpetra {
namespace Details {
 
void
initializeKokkos ()
{
  if (! Kokkos::is_initialized ()) {
    std::vector<std::string> args = Teuchos::GlobalMPISession::getArgv ();
    int narg = static_cast<int> (args.size ()); // must be nonconst
 
    std::vector<char*> args_c (narg);
    for (int k = 0; k < narg; ++k) {
      // mfh 25 Oct 2017: I feel a bit uncomfortable about this
      // const_cast, but there is no other way to pass
      // command-line arguments to Kokkos::initialize.
      args_c[k] = const_cast<char*> (args[k].c_str ());
    }
    Kokkos::initialize (narg, narg == 0 ? nullptr : args_c.data ());
    std::atexit (Kokkos::finalize_all);
  }
}
 
} // namespace Details
} // namespace Tpetra