org.apache.flink.runtime.io.network.partition

类 PageSizeUtil

java.lang.Object

org.apache.flink.runtime.io.network.partition.PageSizeUtil

public final class PageSizeUtil
extends Object

Utility for accessing the system page size.

字段概要

字段

限定符和类型	字段和说明
static int	CONSERVATIVE_PAGE_SIZE_MULTIPLE A conservative fallback value (64 KiBytes) that should be a multiple of the page size even in some uncommon cases of servers installations with larger-than-usual page sizes.
static int	DEFAULT_PAGE_SIZE The default page size on most systems.
static int	PAGE_SIZE_UNKNOWN Value indicating an unknown page size.

方法概要

限定符和类型	方法和说明
static int	getSystemPageSize() Tries to get the system page size.
static int	getSystemPageSizeOrConservativeMultiple() Tries to get the system page size.
static int	getSystemPageSizeOrDefault() Tries to get the system page size.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

字段详细资料

PAGE_SIZE_UNKNOWN

public static final int PAGE_SIZE_UNKNOWN

Value indicating an unknown page size.

另请参阅:

常量字段值

DEFAULT_PAGE_SIZE

public static final int DEFAULT_PAGE_SIZE

The default page size on most systems.

另请参阅:

常量字段值

CONSERVATIVE_PAGE_SIZE_MULTIPLE

public static final int CONSERVATIVE_PAGE_SIZE_MULTIPLE

A conservative fallback value (64 KiBytes) that should be a multiple of the page size even in some uncommon cases of servers installations with larger-than-usual page sizes.

另请参阅:

常量字段值

方法详细资料

getSystemPageSize

public static int getSystemPageSize()

Tries to get the system page size. If the page size cannot be determined, this returns -1.

This internally relies on the presence of "unsafe" and the resolution via some Netty utilities.

getSystemPageSizeOrDefault

public static int getSystemPageSizeOrDefault()

Tries to get the system page size. If the page size cannot be determined, this returns the DEFAULT_PAGE_SIZE.

getSystemPageSizeOrConservativeMultiple

public static int getSystemPageSizeOrConservativeMultiple()

Tries to get the system page size. If the page size cannot be determined, this returns the CONSERVATIVE_PAGE_SIZE_MULTIPLE.