com.orientechnologies.common.util

Class OMemory

java.lang.Object

com.orientechnologies.common.util.OMemory

public class OMemory
extends Object

Provides various utilities related to memory management and configuration.

Author:

Sergey Sitnikov

Method Summary

Modifier and Type	Method and Description
static void	checkByteBufferPoolConfiguration() Checks the OByteBufferPool configuration and emits a warning if configuration is invalid.
static void	checkCacheMemoryConfiguration() Checks the OrientDB cache memory configuration and emits a warning if configuration is invalid.
static void	checkDirectMemoryConfiguration() Checks the direct memory configuration and emits a warning if configuration is invalid.
static void	fixCommonConfigurationProblems() Tries to fix some common cache/memory configuration problems: Cache size is larger than direct memory size. Memory chunk size is larger than cache size.
static long	getCappedRuntimeMaxMemory(long unlimitedCap)
static long	getConfiguredMaxDirectMemory() Obtains the configured value of the -XX:MaxDirectMemorySize JVM option in bytes.

Methods inherited from class java.lang.Object

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

Method Detail

getCappedRuntimeMaxMemory

public static long getCappedRuntimeMaxMemory(long unlimitedCap)

Parameters:

unlimitedCap - the upper limit on reported memory, if JVM reports unlimited memory.

Returns:

same as Runtime.maxMemory() except that unlimitedCap limit is applied if JVM reports unlimited memory.

getConfiguredMaxDirectMemory

public static long getConfiguredMaxDirectMemory()

Obtains the configured value of the -XX:MaxDirectMemorySize JVM option in bytes.

Returns:

the configured maximum direct memory size or -1 if no configuration provided.

checkDirectMemoryConfiguration

public static void checkDirectMemoryConfiguration()

Checks the direct memory configuration and emits a warning if configuration is invalid.

checkCacheMemoryConfiguration

public static void checkCacheMemoryConfiguration()

Checks the OrientDB cache memory configuration and emits a warning if configuration is invalid.

checkByteBufferPoolConfiguration

public static void checkByteBufferPoolConfiguration()

Checks the OByteBufferPool configuration and emits a warning if configuration is invalid.

fixCommonConfigurationProblems

public static void fixCommonConfigurationProblems()

Tries to fix some common cache/memory configuration problems:

• Cache size is larger than direct memory size.
• Memory chunk size is larger than cache size.