Tpetra_Details_initializeKokkos.cpp

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#include "Tpetra_Details_initializeKokkos.hpp"
#include "Teuchos_GlobalMPISession.hpp"
#include "Kokkos_Core.hpp"
#include "Tpetra_Details_checkLaunchBlocking.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 ());
    checkOldCudaLaunchBlocking();
    std::atexit (Kokkos::finalize_all);
  }
}

} // namespace Details
} // namespace Tpetra