alluxio.util

Interface ObjectSizeCalculator.MemoryLayoutSpecification

Enclosing class:

ObjectSizeCalculator

public static interface ObjectSizeCalculator.MemoryLayoutSpecification

Describes constant memory overheads for various constructs in a JVM implementation.

Method Summary

Modifier and Type	Method and Description
int	getArrayHeaderSize() Returns the fixed overhead of an array of any type or length in this JVM.
int	getObjectHeaderSize() Returns the fixed overhead of for any Object subclass in this JVM.
int	getObjectPadding() Returns the quantum field size for a field owned by an object in this JVM.
int	getReferenceSize() Returns the fixed size of an object reference in this JVM.
int	getSuperclassFieldPadding() Returns the quantum field size for a field owned by one of an object's ancestor superclasses in this JVM.

Method Detail

getArrayHeaderSize

int getArrayHeaderSize()

Returns the fixed overhead of an array of any type or length in this JVM.

Returns:

the fixed overhead of an array

getObjectHeaderSize

int getObjectHeaderSize()

Returns the fixed overhead of for any Object subclass in this JVM.

Returns:

the fixed overhead of any object

getObjectPadding

int getObjectPadding()

Returns the quantum field size for a field owned by an object in this JVM.

Returns:

the quantum field size for an object

getReferenceSize

int getReferenceSize()

Returns the fixed size of an object reference in this JVM.

Returns:

the size of all object references

getSuperclassFieldPadding

int getSuperclassFieldPadding()

Returns the quantum field size for a field owned by one of an object's ancestor superclasses in this JVM.

Returns:

the quantum field size for a superclass field