pegasus.mapreduce.common.utils

Class MemoryUtils

java.lang.Object

pegasus.mapreduce.common.utils.MemoryUtils

public class MemoryUtils
extends java.lang.Object

Provides some memory utility methods to inspect current memory status.

Constructor Summary

Constructors

Constructor and Description
MemoryUtils()

Method Summary

Modifier and Type	Method and Description
static long	availableMemoryBytes() Returns the available heap size in bytes.
static long	bytesToMebibytes(long bytes) Converts the given memory size from bytes to mebibytes.
static void	callGCMultipleTimes() Call garbage collector 5 times explicitly.
static void	callGCMultipleTimes(int times) Call garbage collector explicitly.
static long	maxMemoryBytes() Returns the maximum heap size in bytes.

Methods inherited from class java.lang.Object

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

Constructor Detail

MemoryUtils

public MemoryUtils()

Method Detail

callGCMultipleTimes

public static void callGCMultipleTimes()

Call garbage collector 5 times explicitly.

callGCMultipleTimes

public static void callGCMultipleTimes(int times)

Call garbage collector explicitly.

Parameters:

times - The number of calling garbage collector

maxMemoryBytes

public static long maxMemoryBytes()

Returns the maximum heap size in bytes.

Returns:

The maximum heap size in bytes

availableMemoryBytes

public static long availableMemoryBytes()

Returns the available heap size in bytes.

Returns:

The available heap size in bytes.

See Also:

https://stackoverflow.com/a/12807848/2034780

bytesToMebibytes

public static long bytesToMebibytes(long bytes)

Converts the given memory size from bytes to mebibytes.

Parameters:

bytes - A size of memory in bytes

Returns:

The size of memory in mebibytes