rednaxelafx

[Global flags]
uintx AdaptivePermSizeWeight               = 20               {product}
uintx AdaptiveSizeDecrementScaleFactor     = 4                {product}
uintx AdaptiveSizeMajorGCDecayTimeScale    = 10               {product}
uintx AdaptiveSizePausePolicy              = 0                {product}
uintx AdaptiveSizePolicyCollectionCostMargin  = 50               {product}
uintx AdaptiveSizePolicyInitializingSteps  = 20               {product}
uintx AdaptiveSizePolicyOutputInterval     = 0                {product}
uintx AdaptiveSizePolicyWeight             = 10               {product}
uintx AdaptiveSizeThroughPutPolicy         = 0                {product}

rednaxelafx

package fx.jvm.hotspot.tools;

import java.util.List;

import sun.jvm.hotspot.tools.Tool;

public class PrintThreadIds extends Tool {
    public static void main(String[] args) {
        PrintThreadIds tool = new PrintThreadIds();
        tool.start(args);

rednaxelafx

import java.io.*;
import java.net.*;

public class F {
  static F instance;
  
  public static void main(String[] args) throws Exception {
    ClassLoader l = new URLClassLoader(new URL[] { new File(".").toURI().toURL()}, null);
    Class<?> clazz = l.loadClass("F");
    F.class.getDeclaredField("instance").set(null, clazz.newInstance());

rednaxelafx

public class TestStackOpsMain {
  public static void main(String[] args) {
    // refer to earlier blog post, http://rednaxelafx.javaeye.com/blog/461787
    byte[] code = {
      // CODE SECTION
      // push ebp
      0x55,
      // mov  ebp,esp
      (byte) 0x8B, (byte) 0xEC,
      // push -0B                         ; /DevType = STD_OUTPUT_HANDLE

rednaxelafx

def getPropertiesFrom(obj) {
  obj.metaClass.properties.findAll { it.name != 'class' && it.name != 'metaClass' }.inject([:]) { acc, e -> acc[e.name] = e.getProperty(obj); acc }
}

class Foo {
  int getBar() { 42; }
  List getProperties() { [] }
}
def foo = new Foo();
foo.properties;         //=> []

rednaxelafx

----------------------------------------------------------------------
Interpreter

code size        =     65K bytes
total space      =    167K bytes
wasted space     =    102K bytes

# of codelets    =    258
avg codelet size =    258 bytes

rednaxelafx

----------------------------------------------------------------------
Interpreter

code size        =     56K bytes
total space      =    167K bytes
wasted space     =    111K bytes

# of codelets    =    258
avg codelet size =    224 bytes

rednaxelafx

[Global flags]
uintx AdaptivePermSizeWeight               = 20               {product}
uintx AdaptiveSizeDecrementScaleFactor     = 4                {product}
uintx AdaptiveSizeMajorGCDecayTimeScale    = 10               {product}
uintx AdaptiveSizePausePolicy              = 0                {product}
uintx AdaptiveSizePolicyCollectionCostMargin  = 50               {product}
uintx AdaptiveSizePolicyInitializingSteps  = 20               {product}
uintx AdaptiveSizePolicyOutputInterval     = 0                {product}
uintx AdaptiveSizePolicyWeight             = 10               {product}
uintx AdaptiveSizeThroughPutPolicy         = 0                {product}

rednaxelafx

[sajia@sajia ~]$ java
Usage: java [-options] class [args...]
           (to execute a class)
   or  java [-options] -jar jarfile [args...]
           (to execute a jar file)

where options include:
    -d32          use a 32-bit data model if available

    -d64          use a 64-bit data model if available

rednaxelafx

Correspondence between Sun/Oracle JDK, OpenJDK and HotSpot VM versions

build date	Sun/Oracle JDK Version	OpenJDK Version	HotSpot VM Version
2006-11-29	1.6.0-b105		1.6.0-b105
2007-03-14	1.6.0_01-b06		1.6.0_01-b06
2007-06-22	1.6.0_02-b05		1.6.0_02-b05
2007-09-24	1.6.0_03-b05		1.6.0_03-b05
2007-12-14	1.6.0_04-b12		10.0-b19