Tpetra_Details_initializeKokkos.cpp

// @HEADER
// *****************************************************************************
//          Tpetra: Templated Linear Algebra Services Package
//
// Copyright 2008 NTESS and the Tpetra contributors.
// SPDX-License-Identifier: BSD-3-Clause
// *****************************************************************************
// @HEADER

#include "Tpetra_Details_initializeKokkos.hpp"
#include "Teuchos_GlobalMPISession.hpp"
#include "Kokkos_Core.hpp"
#include "Tpetra_Details_checkLaunchBlocking.hpp"
#include "Tpetra_Details_KokkosTeuchosTimerInjection.hpp"
#include <cstdlib>  // std::atexit
#include <string>
#include <vector>

namespace Tpetra {
namespace Details {

void finalizeKokkosIfNeeded() {
  if (!Kokkos::is_finalized()) {
    Kokkos::finalize();
  }
}

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;
    std::vector<std::unique_ptr<char[]>> args_;
    for (auto const& x : args) {
      args_.emplace_back(new char[x.size() + 1]);
      char* ptr = args_.back().get();
      strcpy(ptr, x.c_str());
      args_c.push_back(ptr);
    }
    args_c.push_back(nullptr);

    Kokkos::initialize(narg, narg == 0 ? nullptr : args_c.data());
    checkOldCudaLaunchBlocking();

    std::atexit(finalizeKokkosIfNeeded);
  }
  // Add Kokkos calls to the TimeMonitor if the environment says so
  Tpetra::Details::AddKokkosDeepCopyToTimeMonitor();
  Tpetra::Details::AddKokkosFenceToTimeMonitor();
  Tpetra::Details::AddKokkosFunctionsToTimeMonitor();
}

}  // namespace Details
}  // namespace Tpetra