Host memory resource using standard CPU allocation. More...

#include <host_memory_resource.hpp>

Public Member Functions
	HostMemoryResource (HostMemoryResource const &)=default
	Copyable.

	HostMemoryResource (HostMemoryResource &&)=default
	Movable.

HostMemoryResource &	operator= (HostMemoryResource const &)=default
	Copy assignment. More...

HostMemoryResource &	operator= (HostMemoryResource &&)=default
	Move assignment. More...

void *	allocate_sync (std::size_t, std::size_t)
	Synchronously allocates host memory is disabled. More...

void	deallocate_sync (void *, std::size_t, std::size_t)
	Synchronously deallocates host memory is disabled. More...

void *	allocate (rmm::cuda_stream_view stream, std::size_t size, std::size_t alignment=rmm::CUDA_ALLOCATION_ALIGNMENT)
	Allocates host memory associated with a CUDA stream. More...

void	deallocate (rmm::cuda_stream_view stream, void *ptr, std::size_t size, std::size_t alignment=rmm::CUDA_ALLOCATION_ALIGNMENT) noexcept
	Deallocates host memory associated with a CUDA stream. More...

bool	operator== ([[maybe_unused]] HostMemoryResource const &other) const noexcept
	Compares this resource to another resource. More...

bool	operator!= ([[maybe_unused]] HostMemoryResource const &other) const noexcept
	Compares this resource to another resource. More...

Friends
void	get_property (HostMemoryResource const &, cuda::mr::host_accessible) noexcept
	Enables the `cuda::mr::host_accessible` property. More...

Detailed Description

Host memory resource using standard CPU allocation.

This resource allocates pageable host memory using the new and delete operators. It is intended for use with cuda::mr::resource and related facilities, and advertises the cuda::mr::host_accessible property.

For sufficiently large allocations (>4 MiB), this resource also issues a best-effort request to enable Transparent Huge Pages (THP) on the allocated region. THP can improve device-host memory transfer performance for large buffers. The hint is applied via madvise(MADV_HUGEPAGE) and may be ignored by the kernel depending on system configuration or resource availability.

Definition at line 32 of file host_memory_resource.hpp.

Member Function Documentation

◆ allocate()

void* rapidsmpf::HostMemoryResource::allocate	(	rmm::cuda_stream_view	stream,
		std::size_t	size,
		std::size_t	alignment = `rmm::CUDA_ALLOCATION_ALIGNMENT`
	)

Allocates host memory associated with a CUDA stream.

Parameters

stream	CUDA stream associated with the allocation.
size	Number of bytes to at least allocate.
alignment	Required alignment.

Returns: Pointer to the allocated memory.

Exceptions

std::bad_alloc	If the allocation fails.
std::invalid_argument	If `alignment` is not a valid alignment.

◆ allocate_sync()

void* rapidsmpf::HostMemoryResource::allocate_sync	(	std::size_t	,
		std::size_t
	)

inline

Synchronously allocates host memory is disabled.

Always use stream-ordered allocators in RapidsMPF.

Returns: N/A.

Exceptions

std::invalid_argument Always.

Definition at line 57 of file host_memory_resource.hpp.

◆ deallocate()

void rapidsmpf::HostMemoryResource::deallocate	(	rmm::cuda_stream_view	stream,
		void *	ptr,
		std::size_t	size,
		std::size_t	alignment = `rmm::CUDA_ALLOCATION_ALIGNMENT`
	)

noexcept

Deallocates host memory associated with a CUDA stream.

Synchronizes stream before deallocating the memory with the delete operator.

Parameters

stream	CUDA stream associated with operations that used `ptr`.
ptr	Pointer to the memory to deallocate. May be nullptr.
size	Number of bytes previously allocated at `ptr`.
alignment	Alignment originally used for the allocation.

◆ deallocate_sync()

void rapidsmpf::HostMemoryResource::deallocate_sync	(	void *	,
		std::size_t	,
		std::size_t
	)

inline

Synchronously deallocates host memory is disabled.

Exceptions

std::invalid_argument Always.

Definition at line 69 of file host_memory_resource.hpp.

◆ operator!=()

bool rapidsmpf::HostMemoryResource::operator!= ( [[maybe_unused] ] HostMemoryResource const & other ) const

inlinenoexcept

Compares this resource to another resource.

All instances are stateless and interchangeable, so this always returns true.

Parameters

other The resource to compare with.

Returns: true

Definition at line 127 of file host_memory_resource.hpp.

◆ operator=() [1/2]

HostMemoryResource& rapidsmpf::HostMemoryResource::operator= ( HostMemoryResource && )

default

Move assignment.

Returns: Reference to this object after assignment.

◆ operator=() [2/2]

HostMemoryResource& rapidsmpf::HostMemoryResource::operator= ( HostMemoryResource const & )

default

Copy assignment.

Returns: Reference to this object after assignment.

◆ operator==()

bool rapidsmpf::HostMemoryResource::operator== ( [[maybe_unused] ] HostMemoryResource const & other ) const

inlinenoexcept

Compares this resource to another resource.

All instances are stateless and interchangeable, so this always returns true.

Parameters

other The resource to compare with.

Returns: true

Definition at line 120 of file host_memory_resource.hpp.

Friends And Related Function Documentation

◆ get_property

void get_property	(	HostMemoryResource const &	,
		cuda::mr::host_accessible
	)

friend

Enables the cuda::mr::host_accessible property.

This property declares that a HostMemoryResource provides host accessible memory

Definition at line 138 of file host_memory_resource.hpp.

The documentation for this class was generated from the following file:

/__w/rapidsmpf/rapidsmpf/cpp/include/rapidsmpf/memory/host_memory_resource.hpp

Public Member Functions

Friends

Detailed Description

Member Function Documentation

◆ allocate()

◆ allocate_sync()

◆ deallocate()

◆ deallocate_sync()

◆ operator!=()

◆ operator=() [1/2]

◆ operator=() [2/2]

◆ operator==()

Friends And Related Function Documentation

◆ get_property