Charles Hu charleehu
charleehu
/ GCUtils.java
Created
November 21, 2011 08:46
— forked from rednaxelafx/GCUtils.java
HotSpot VM utils
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| public class GCUtils { | |
| private static final String DISABLE_EXPLICIT_GC = "DisableExplicitGC"; // need to be "manageable" in VM | |
| public static void forceGC() { | |
| String oldValue = HotSpotUtils.getVMOption(DISABLE_EXPLICIT_GC); | |
| if ("true".equals(oldValue)) { | |
| HotSpotUtils.setVMOption(DISABLE_EXPLICIT_GC, "false"); | |
| System.gc(); | |
| HotSpotUtils.setVMOption(DISABLE_EXPLICIT_GC, oldValue); | |
| } else { |
charleehu
/ DirectMemorySize.java
Created
January 30, 2012 09:05
— forked from rednaxelafx/DirectMemorySize.java
An Serviceability-Agent based tool to see stats of NIO direct memory, as an alternative on JDKs without JMX support for direct memory monitoring.
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| import java.io.*; | |
| import java.util.*; | |
| import sun.jvm.hotspot.memory.*; | |
| import sun.jvm.hotspot.oops.*; | |
| import sun.jvm.hotspot.debugger.*; | |
| import sun.jvm.hotspot.runtime.*; | |
| import sun.jvm.hotspot.tools.*; | |
| import sun.jvm.hotspot.utilities.*; | |
| public class DirectMemorySize extends Tool { |