Name: gm110360 Date: 04/08/2003


FULL PRODUCT VERSION :
JDK 1.3.1_07, JDK 1.4.1 JDK 1.4.2Beta

FULL OS VERSION :
Linux agentdev 2.4.18-27.8.0 #1 Fri Mar 14 06:45:49 EST 2003 i686 i686 i386 GNU/Linux
Also in win32 platforms

EXTRA RELEVANT SYSTEM CONFIGURATION :
PIII 933MHz, 384MB RAM

A DESCRIPTION OF THE PROBLEM :
There is a poor performance on:

HashMap, StringBuffer, System.arraycopy

JDK 1.4.1 (1.4.2 is even worse) is 2 times slower on those types of operations
than 1.3.1

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Just write a program that inserts/looks up stuff from HashMap or does operations
(.append()) with StringBuffer or performs System.arraycopy().

EXPECTED VERSUS ACTUAL BEHAVIOR :
System.arraycopy: 72ms
System.arraycopy: 249ms

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.lang.reflect.*;

public class test
{

/**
* The source array
*/

static final char[] a = {'H', 'e', 'l', 'l', 'o', ' ', 'W', 'o', 'r', 'l', 'd', '!'};

/**
* The target array
*/

static final char[] b = new char[a.length];

/**
* The simple method invoked using reflection
*/

public static int f()
{
return 5;
}

/**
* The StringBuffer test method
*/

public static String fSB()
{
StringBuffer buff = new StringBuffer(12);
buff.append("Hello");
buff.append(' ');
buff.append("World");
buff.append('!');

return buff.toString();
}

/**
* Invokes this method
*
* @param param The first parameter
* @param param2 The second parameter
*
* @return int - Number
*
* @exception NullPointerException Never thrown
*/

public static int fSB0(int param, int param2) throws NullPointerException
{
System.arraycopy(a, 0, b, 0, a.length);
return 0;
}

/**
* The main
*
* @param args The arguments
*/

public static void main(String[] args)
{
System.out.println("Tests performed on " + System.getProperty("java.version"));
System.out.println(" " + System.getProperty("java.vm.vendor"));
System.out.println(" " + System.getProperty("java.vm.name"));

try
{
Class aClass = Class.forName("test");
Method m = aClass.getMethod("f", null);

long start = System.currentTimeMillis();

for(int i = 0; i < 1000000; i++)
{
m.invoke(null, null);
}

long end = System.currentTimeMillis();

System.out.println("Reflection: " + (end - start));

start = System.currentTimeMillis();

for(int i = 0; i < 1000000; i++)
{
String s = fSB();
}

end = System.currentTimeMillis();

System.out.println("String Buffer: " + (end - start));

start = System.currentTimeMillis();

for(int i = 0; i < 1000000; i++)
{
fSB0(0, 1);
}

end = System.currentTimeMillis();

System.out.println("System.arraycopy: " + (end - start));
}
catch(Exception e)
{
e.printStackTrace();
}
}
}


---------- END SOURCE ----------

Release Regression From : 1.3.1
The above release value was the last known release where this
bug was known to work. Since then there has been a regression.

(Review ID: 183695)
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