kvikio::RemoteHandle Class Reference

Handle of remote file. More...

#include <remote_handle.hpp>

Public Member Functions
	RemoteHandle (std::unique_ptr< RemoteEndpoint > endpoint, std::size_t nbytes)
	Create a new remote handle from an endpoint and a file size. More...
	RemoteHandle (std::unique_ptr< RemoteEndpoint > endpoint)
	Create a new remote handle from an endpoint (infers the file size). More...
	RemoteHandle (RemoteHandle &&o)=default
RemoteHandle &	operator= (RemoteHandle &&o)=default
	RemoteHandle (RemoteHandle const &)=delete
RemoteHandle &	operator= (RemoteHandle const &)=delete
std::size_t	nbytes () const noexcept
	Get the file size. More...
RemoteEndpoint const &	endpoint () const noexcept
	Get a const reference to the underlying remote endpoint. More...
std::size_t	read (void *buf, std::size_t size, std::size_t file_offset=0)
	Read from remote source into buffer (host or device memory). More...
std::future< std::size_t >	pread (void *buf, std::size_t size, std::size_t file_offset=0, std::size_t task_size=defaults::task_size())
	Read from remote source into buffer (host or device memory) in parallel. More...

Detailed Description

Handle of remote file.

Definition at line 200 of file remote_handle.hpp.

Constructor & Destructor Documentation

RemoteHandle() [1/2]

kvikio::RemoteHandle::RemoteHandle	(	std::unique_ptr< RemoteEndpoint >	endpoint,
		std::size_t	nbytes
	)

Create a new remote handle from an endpoint and a file size.

Parameters

endpoint	Remote endpoint used for subsequent IO.
nbytes	The size of the remote file (in bytes).

RemoteHandle() [2/2]

kvikio::RemoteHandle::RemoteHandle

(

std::unique_ptr< RemoteEndpoint >

endpoint

)

Create a new remote handle from an endpoint (infers the file size).

The file size is received from the remote server using endpoint.

Parameters

endpoint

Remote endpoint used for subsequently IO.

Member Function Documentation

endpoint()

RemoteEndpoint const& kvikio::RemoteHandle::endpoint ( ) const

noexcept

Get a const reference to the underlying remote endpoint.

Returns

The remote endpoint.

nbytes()

std::size_t kvikio::RemoteHandle::nbytes ( ) const

noexcept

Get the file size.

Note, this is very fast, no communication needed.

Returns

The number of bytes.

pread()

std::future<std::size_t> kvikio::RemoteHandle::pread	(	void *	buf,
		std::size_t	size,
		std::size_t	file_offset = 0,
		std::size_t	task_size = defaults::task_size()
	)

Read from remote source into buffer (host or device memory) in parallel.

This API is a parallel async version of .read() that partitions the operation into tasks of size task_size for execution in the default thread pool.

Parameters

buf	Pointer to host or device memory.
size	Number of bytes to read.
file_offset	File offset in bytes.
task_size	Size of each task in bytes.

Returns

Future that on completion returns the size of bytes read, which is always size.

read()

std::size_t kvikio::RemoteHandle::read	(	void *	buf,
		std::size_t	size,
		std::size_t	file_offset = 0
	)

Read from remote source into buffer (host or device memory).

When reading into device memory, a bounce buffer is used to avoid many small memory copies to device. Use kvikio::default::bounce_buffer_size_reset() to set the size of this bounce buffer (default 16 MiB).

Parameters

buf	Pointer to host or device memory.
size	Number of bytes to read.
file_offset	File offset in bytes.

Returns

Number of bytes read, which is always size.

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

• remote_handle.hpp