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Kokkos_MPISpace.hpp
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Kokkos_MPISpace.hpp
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//@HEADER
// ************************************************************************
//
// Kokkos v. 4.0
// Copyright (2022) National Technology & Engineering
// Solutions of Sandia, LLC (NTESS).
//
// Under the terms of Contract DE-NA0003525 with NTESS,
// the U.S. Government retains certain rights in this software.
//
// Part of Kokkos, under the Apache License v2.0 with LLVM Exceptions.
// See https://kokkos.org/LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// Contact: Jan Ciesko (jciesko@sandia.gov)
//
//@HEADER
#ifndef KOKKOS_MPISPACE_HPP
#define KOKKOS_MPISPACE_HPP
#include <cstring>
#include <iosfwd>
#include <string>
#include <typeinfo>
#include <Kokkos_Core.hpp>
#include <Kokkos_RemoteSpaces.hpp>
#include <mpi.h>
#include <vector>
namespace Kokkos {
namespace Experimental {
class MPISpace {
public:
#if defined(KOKKOS_ENABLE_DEFAULT_DEVICE_TYPE_OPENMP)
using execution_space = Kokkos::OpenMP;
#elif defined(KOKKOS_ENABLE_DEFAULT_DEVICE_TYPE_THREADS)
using execution_space = Kokkos::Threads;
#elif defined(KOKKOS_ENABLE_OPENMP)
using execution_space = Kokkos::OpenMP;
#elif defined(KOKKOS_ENABLE_THREADS)
using execution_space = Kokkos::Threads;
#elif defined(KOKKOS_ENABLE_SERIAL)
using execution_space = Kokkos::Serial;
#else
#error \
"At least one of the following host execution spaces must be defined: Kokkos::OpenMP, Kokkos::Threads, Kokkos::Qthreads, or Kokkos::Serial. You might be seeing this message if you disabled the Kokkos::Serial device explicitly using the Kokkos_ENABLE_Serial:BOOL=OFF CMake option, but did not enable any of the other host execution space devices."
#endif
using memory_space = MPISpace;
using device_type = Kokkos::Device<execution_space, memory_space>;
using size_type = size_t;
MPISpace();
MPISpace(MPISpace &&rhs) = default;
MPISpace(const MPISpace &rhs) = default;
MPISpace &operator=(MPISpace &&) = default;
MPISpace &operator=(const MPISpace &) = default;
~MPISpace() = default;
explicit MPISpace(const MPI_Comm &);
/**\brief Allocate untracked memory in the space */
void *allocate(const size_t arg_alloc_size) const;
void *allocate(const char *arg_label, const size_t arg_alloc_size,
const size_t arg_logical_size = 0) const;
/**\brief Deallocate untracked memory in the space */
void deallocate(void *const arg_alloc_ptr, const size_t arg_alloc_size) const;
void deallocate(const char *arg_label, void *const arg_alloc_ptr,
const size_t arg_alloc_size,
const size_t arg_logical_size = 0) const;
private:
#if (KOKKOS_VERSION < 40300)
template <class, class, class, class>
friend class Kokkos::Experimental::LogicalMemorySpace;
#endif
void *impl_allocate(const char *arg_label, const size_t arg_alloc_size,
const size_t arg_logical_size = 0,
const Kokkos::Tools::SpaceHandle =
Kokkos::Tools::make_space_handle(name())) const;
void impl_deallocate(const char *arg_label, void *const arg_alloc_ptr,
const size_t arg_alloc_size,
const size_t arg_logical_size = 0,
const Kokkos::Tools::SpaceHandle =
Kokkos::Tools::make_space_handle(name())) const;
public:
/**\brief Return Name of the MemorySpace */
static constexpr const char *name() { return m_name; }
void fence() const;
int allocation_mode;
int64_t extent;
static std::vector<MPI_Win> mpi_windows;
static MPI_Win current_win;
void impl_set_allocation_mode(const int);
void impl_set_extent(int64_t N);
private:
static constexpr const char *m_name = "MPI";
friend class Kokkos::Impl::SharedAllocationRecord<
Kokkos::Experimental::MPISpace, void>;
};
size_t get_num_pes();
size_t get_my_pe();
} // namespace Experimental
} // namespace Kokkos
namespace Kokkos {
namespace Impl {
template <>
struct DeepCopy<HostSpace, Kokkos::Experimental::MPISpace> {
DeepCopy(void *dst, const void *src, size_t);
};
template <>
struct DeepCopy<Kokkos::Experimental::MPISpace, HostSpace> {
DeepCopy(void *dst, const void *src, size_t);
};
template <>
struct DeepCopy<Kokkos::Experimental::MPISpace,
Kokkos::Experimental::MPISpace> {
DeepCopy(void *dst, const void *src, size_t);
};
template <class ExecutionSpace>
struct DeepCopy<Kokkos::Experimental::MPISpace, Kokkos::Experimental::MPISpace,
ExecutionSpace> {
DeepCopy(void *dst, const void *src, size_t n);
DeepCopy(const ExecutionSpace &exec, void *dst, const void *src, size_t n);
};
template <>
struct MemorySpaceAccess<Kokkos::Experimental::MPISpace,
Kokkos::Experimental::MPISpace> {
enum { assignable = true };
enum { accessible = true };
enum { deepcopy = false };
};
template <>
struct MemorySpaceAccess<Kokkos::HostSpace, Kokkos::Experimental::MPISpace> {
enum { assignable = false };
enum { accessible = true };
enum { deepcopy = true };
};
template <>
struct MemorySpaceAccess<Kokkos::Experimental::MPISpace, Kokkos::HostSpace> {
enum { assignable = false };
enum { accessible = true };
enum { deepcopy = true };
};
// MPI locality based on an MPI window and offset
typedef struct MPIAccessLocation {
mutable MPI_Win win;
size_t offset;
KOKKOS_INLINE_FUNCTION
MPIAccessLocation() {
win = MPI_WIN_NULL;
offset = 0;
}
KOKKOS_INLINE_FUNCTION
MPIAccessLocation(MPI_Win win_, size_t offset_) {
win = win_;
offset = offset_;
}
KOKKOS_INLINE_FUNCTION
void operator=(const MPIAccessLocation &val) {
win = val.win;
offset = val.offset;
}
} MPIAccessLocation;
} // namespace Impl
} // namespace Kokkos
#include <Kokkos_RemoteSpaces_Error.hpp>
#include <Kokkos_RemoteSpaces_Options.hpp>
#include <Kokkos_MPISpace_ViewTraits.hpp>
#include <Kokkos_RemoteSpaces_ViewLayout.hpp>
#include <Kokkos_RemoteSpaces_Helpers.hpp>
#include <Kokkos_RemoteSpaces_DeepCopy.hpp>
#include <Kokkos_RemoteSpaces_ViewOffset.hpp>
#include <Kokkos_MPISpace_Ops.hpp>
#include <Kokkos_MPISpace_BlockOps.hpp>
#include <Kokkos_RemoteSpaces_ViewMapping.hpp>
#include <Kokkos_MPISpace_AllocationRecord.hpp>
#include <Kokkos_MPISpace_DataHandle.hpp>
#include <Kokkos_RemoteSpaces_LocalDeepCopy.hpp>
#endif // #define KOKKOS_MPISPACE_HPP