Package org.apache.lucene.tests.util

Class RamUsageTester

java.lang.Object

org.apache.lucene.tests.util.RamUsageTester

public final class RamUsageTester
extends Object

Crawls object graph to collect RAM usage for testing

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	RamUsageTester.Accumulator	An accumulator of object references.

Constructor Summary

Constructors

Constructor	Description
RamUsageTester()

Method Summary

Modifier and Type	Method	Description
static String	humanSizeOf(Object object)	Return a human-readable size of a given object.
static long	ramUsed(Object obj)	Same as calling sizeOf(obj, DEFAULT_FILTER).
static long	ramUsed(Object obj, RamUsageTester.Accumulator accumulator)	Estimates the RAM usage by the given object.

Methods inherited from class java.lang.Object

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

Constructor Details

RamUsageTester

public RamUsageTester()

Method Details

ramUsed

public static long ramUsed(Object obj,
 RamUsageTester.Accumulator accumulator)

Estimates the RAM usage by the given object. It will walk the object tree and sum up all referenced objects.

Resource Usage: This method internally uses a set of every object seen during traversals so it does allocate memory (it isn't side-effect free). After the method exits, this memory should be GCed.

ramUsed

public static long ramUsed(Object obj)

Same as calling sizeOf(obj, DEFAULT_FILTER).

humanSizeOf

public static String humanSizeOf(Object object)

Return a human-readable size of a given object.

See Also:

• ramUsed(Object)
• RamUsageEstimator.humanReadableUnits(long)