Kokkos_HostSpace.hpp

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//                        Kokkos v. 3.0
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#ifndef KOKKOS_HOSTSPACE_HPP
#define KOKKOS_HOSTSPACE_HPP
 
#include <cstring>
#include <string>
#include <iosfwd>
#include <typeinfo>
 
#include <Kokkos_Core_fwd.hpp>
#include <Kokkos_Concepts.hpp>
#include <Kokkos_MemoryTraits.hpp>
 
#include <impl/Kokkos_Traits.hpp>
#include <impl/Kokkos_Error.hpp>
#include <impl/Kokkos_SharedAlloc.hpp>
#include <impl/Kokkos_Tools.hpp>
 
#include "impl/Kokkos_HostSpace_deepcopy.hpp"
 
/*--------------------------------------------------------------------------*/
 
namespace Kokkos {
 
namespace Impl {
 
void init_lock_array_host_space();
 
bool lock_address_host_space(void* ptr);
 
void unlock_address_host_space(void* ptr);
 
}  // namespace Impl
 
}  // namespace Kokkos
 
namespace Kokkos {
class HostSpace {
 public:
  using memory_space = HostSpace;
  using size_type    = size_t;
 
#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_DEFAULT_DEVICE_TYPE_HPX)
  using execution_space = Kokkos::Experimental::HPX;
#elif defined(KOKKOS_ENABLE_OPENMP)
  using execution_space = Kokkos::OpenMP;
#elif defined(KOKKOS_ENABLE_THREADS)
  using execution_space = Kokkos::Threads;
#elif defined(KOKKOS_ENABLE_HPX)
  using execution_space = Kokkos::Experimental::HPX;
#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, 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 device_type = Kokkos::Device<execution_space, memory_space>;
 
  HostSpace();
  HostSpace(HostSpace&& rhs)      = default;
  HostSpace(const HostSpace& rhs) = default;
  HostSpace& operator=(HostSpace&&) = default;
  HostSpace& operator=(const HostSpace&) = default;
  ~HostSpace()                           = default;
 
  enum AllocationMechanism {
    STD_MALLOC,
    POSIX_MEMALIGN,
    POSIX_MMAP,
    INTEL_MM_ALLOC
  };
 
  explicit HostSpace(const AllocationMechanism&);
 
  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;
 
  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:
  template <class, class, class, class>
  friend class Kokkos::Experimental::LogicalMemorySpace;
 
  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:
  static constexpr const char* name() { return m_name; }
 
 private:
  AllocationMechanism m_alloc_mech;
  static constexpr const char* m_name = "Host";
  friend class Kokkos::Impl::SharedAllocationRecord<Kokkos::HostSpace, void>;
};
 
}  // namespace Kokkos
 
//----------------------------------------------------------------------------
 
namespace Kokkos {
 
namespace Impl {
 
static_assert(Kokkos::Impl::MemorySpaceAccess<Kokkos::HostSpace,
                                              Kokkos::HostSpace>::assignable,
              "");
 
template <typename S>
struct HostMirror {
 private:
  // If input execution space can access HostSpace then keep it.
  // Example: Kokkos::OpenMP can access, Kokkos::Cuda cannot
  enum {
    keep_exe = Kokkos::Impl::MemorySpaceAccess<
        typename S::execution_space::memory_space,
        Kokkos::HostSpace>::accessible
  };
 
  // If HostSpace can access memory space then keep it.
  // Example:  Cannot access Kokkos::CudaSpace, can access Kokkos::CudaUVMSpace
  enum {
    keep_mem =
        Kokkos::Impl::MemorySpaceAccess<Kokkos::HostSpace,
                                        typename S::memory_space>::accessible
  };
 
 public:
  using Space = typename std::conditional<
      keep_exe && keep_mem, S,
      typename std::conditional<
          keep_mem,
          Kokkos::Device<Kokkos::HostSpace::execution_space,
                         typename S::memory_space>,
          Kokkos::HostSpace>::type>::type;
};
 
}  // namespace Impl
 
}  // namespace Kokkos
 
//----------------------------------------------------------------------------
 
namespace Kokkos {
 
namespace Impl {
 
template <>
class SharedAllocationRecord<Kokkos::HostSpace, void>
    : public SharedAllocationRecordCommon<Kokkos::HostSpace> {
 private:
  friend Kokkos::HostSpace;
  friend class SharedAllocationRecordCommon<Kokkos::HostSpace>;
 
  using base_t     = SharedAllocationRecordCommon<Kokkos::HostSpace>;
  using RecordBase = SharedAllocationRecord<void, void>;
 
  SharedAllocationRecord(const SharedAllocationRecord&) = delete;
  SharedAllocationRecord& operator=(const SharedAllocationRecord&) = delete;
 
#ifdef KOKKOS_ENABLE_DEBUG
  static RecordBase s_root_record;
#endif
 
  const Kokkos::HostSpace m_space;
 
 protected:
  ~SharedAllocationRecord()
#if defined( \
    KOKKOS_IMPL_INTEL_WORKAROUND_NOEXCEPT_SPECIFICATION_VIRTUAL_FUNCTION)
      noexcept
#endif
      ;
  SharedAllocationRecord() = default;
 
  SharedAllocationRecord(
      const Kokkos::HostSpace& arg_space, const std::string& arg_label,
      const size_t arg_alloc_size,
      const RecordBase::function_type arg_dealloc = &deallocate);
 
 public:
  KOKKOS_INLINE_FUNCTION static SharedAllocationRecord* allocate(
      const Kokkos::HostSpace& arg_space, const std::string& arg_label,
      const size_t arg_alloc_size) {
#if defined(KOKKOS_ACTIVE_EXECUTION_MEMORY_SPACE_HOST)
    return new SharedAllocationRecord(arg_space, arg_label, arg_alloc_size);
#else
    (void)arg_space;
    (void)arg_label;
    (void)arg_alloc_size;
    return (SharedAllocationRecord*)0;
#endif
  }
};
 
}  // namespace Impl
 
}  // namespace Kokkos
 
//----------------------------------------------------------------------------
 
namespace Kokkos {
 
namespace Impl {
 
template <class ExecutionSpace>
struct DeepCopy<HostSpace, HostSpace, ExecutionSpace> {
  DeepCopy(void* dst, const void* src, size_t n) {
    hostspace_parallel_deepcopy(dst, src, n);
  }
 
  DeepCopy(const ExecutionSpace& exec, void* dst, const void* src, size_t n) {
    exec.fence();
    hostspace_parallel_deepcopy(dst, src, n);
    exec.fence();
  }
};
 
}  // namespace Impl
 
}  // namespace Kokkos
 
#endif  // #define KOKKOS_HOSTSPACE_HPP