/usr/include/trilinos/Tpetra_Details_getEntryOnHost.hpp is in libtrilinos-tpetra-dev 12.12.1-5.
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// ***********************************************************************
//
// 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.
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// 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.
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// 2. Redistributions in binary form must reproduce the above copyright
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// 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.
//
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// ************************************************************************
// @HEADER
#ifndef TPETRA_DETAILS_GETENTRYONHOST_HPP
#define TPETRA_DETAILS_GETENTRYONHOST_HPP
/// \file Tpetra_Details_getEntryOnHost.hpp
/// \brief Declaration and definition of
/// Tpetra::Details::getEntryOnHost.
/// \warning The contents of this file are implementation details of
/// Tpetra. We make no promises of backwards compatibility.
#include "TpetraCore_config.h"
#include "Kokkos_Core.hpp"
namespace Tpetra {
namespace Details {
namespace Impl {
template<class ViewType,
class IndexType = typename ViewType::size_type,
const bool isHostSpace =
std::is_same<typename ViewType::memory_space,
Kokkos::HostSpace>::value>
struct GetEntryOnHost {
static typename ViewType::non_const_value_type
getEntryOnHost (const ViewType& x,
const IndexType ind);
};
template<class ViewType,
class IndexType>
struct GetEntryOnHost<ViewType, IndexType, true> {
static typename ViewType::non_const_value_type
getEntryOnHost (const ViewType& x,
const IndexType ind)
{
static_assert (ViewType::Rank == 1, "x must be a rank-1 Kokkos::View.");
return x(ind);
}
};
template<class ViewType,
class IndexType>
struct GetEntryOnHost<ViewType, IndexType, false> {
static typename ViewType::non_const_value_type
getEntryOnHost (const ViewType& x,
const IndexType ind)
{
// Don't assume UVM. Carefully get a 0-D subview of the entry of
// the array, and copy to device. Do not use host mirror, because
// that could just be a UVM View if using UVM.
static_assert (ViewType::Rank == 1, "x must be a rank-1 Kokkos::View.");
#ifdef KOKKOS_HAVE_CUDA
// Do not use Kokkos::create_mirror_view, because that could just
// be a UVM View if using UVM.
typedef typename ViewType::device_type device_type;
// Hide this in ifdef, to avoid unused typedef warning.
typedef typename device_type::execution_space dev_exec_space;
#endif // KOKKOS_HAVE_CUDA
typedef typename ViewType::HostMirror::execution_space host_exec_space;
typedef Kokkos::Device<host_exec_space, Kokkos::HostSpace> host_device_type;
typedef typename ViewType::non_const_value_type value_type;
value_type val;
Kokkos::View<value_type, host_device_type> view_h (&val);
auto view_d = Kokkos::subview (x, ind); // 0-D View
#ifdef KOKKOS_HAVE_CUDA
typedef typename device_type::memory_space dev_memory_space;
if (std::is_same<dev_memory_space, Kokkos::CudaUVMSpace>::value) {
dev_exec_space::fence (); // for UVM's sake.
}
#endif // KOKKOS_HAVE_CUDA
Kokkos::deep_copy (view_h, view_d);
#ifdef KOKKOS_HAVE_CUDA
if (std::is_same<dev_memory_space, Kokkos::CudaUVMSpace>::value) {
dev_exec_space::fence (); // for UVM's sake.
}
#endif // KOKKOS_HAVE_CUDA
return val;
}
};
} // namespace Impl
template<class ViewType,
class IndexType>
typename ViewType::non_const_value_type
getEntryOnHost (const ViewType& x,
const IndexType ind)
{
return Impl::GetEntryOnHost<ViewType, IndexType>::getEntryOnHost (x, ind);
}
} // namespace Details
} // namespace Tpetra
#endif // TPETRA_DETAILS_GETENTRYONHOST_HPP
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