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1	Game Development / Performance Tuning / Re: Char array over String?	on: 2003-09-22 20:45:43
thanks for the help. Good thoughts

2	Game Development / Performance Tuning / Char array over String?	on: 2003-09-22 18:39:31
I've read on the java performance tuning section at java.sun.com that there's an increase in performance when char array's are used. Does anyone feel that you should substitute all your strings for char array's whenever possible? If so, how would you use them because they won't expand. I'm thinking maybe arrayCopy would be helpful there. Just wanted to see what everyone's opinion was. thanks

3	Game Development / Performance Tuning / Re: Java's Unsafe class	on: 2003-08-23 15:46:46
Good thinking. Thanks for the help

4	Game Development / Performance Tuning / Re: Java's Unsafe class	on: 2003-08-22 13:57:26
When I allocate memory with the Unsafe class what exactly is it doing? I'm really just experimenting with the class. And the other thing is that when i call unsafe.addressSize() it always returns 4 for some odd reason. Anyone know how this class works?

5	Game Development / Networking & Multiplayer / Re: java.nio cyclic buffer?	on: 2003-08-21 00:23:48
i say just make it public,recompile and stick the class back into your rt.jar.

6	Game Development / Performance Tuning / Re: Java's Unsafe class	on: 2003-08-14 13:39:16
yeah this is true. It was just something i was toying around with.

7	Game Development / Performance Tuning / Re: Java's Unsafe class	on: 2003-08-14 13:12:54
Thanks for your help. The only reason I was curious about that Unsafe class was my friend wanted to make a stringBuffer class using JNI and it turned out being alot slower than even your normal stringbuffer. I'm guessing the JNI calls are expensive. so we went hunting in the nio classes and found no native methods and that lead to the Unsafe class. Only problem is that security exception that i'm getting. Guess it's unusable at this point. :-/

Game Development / Performance Tuning / Java's Unsafe class

on: 2003-08-14 02:02:51

Anyone have experience using sun.misc.Unsafe ? I tried using it today and it's giving an error when i run it.

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import sun.misc.*;

public class UnsafeTester {
  private static final Unsafe unsafe = Unsafe.getUnsafe();
  public static void main(String[] args) {
    long ptr = unsafe.allocateMemory(512);
    try{
      unsafe.putChar(ptr,'a');
      unsafe.putChar(ptr,'b');
      System.out.println("Unsafe: " + unsafe.toString());
    }
    finally{
      unsafe.freeMemory(ptr);
    }
  }
}

java.lang.ExceptionInInitializerError
Caused by: java.lang.SecurityException: Unsafe
      at sun.misc.Unsafe.getUnsafe(Unsafe.java:68)
      at garbage.UnsafeTester.<clinit>(UnsafeTester.java:8)
Exception in thread "main"

I'm not sure exactly how I should go about tackling this one so any help would be great. Wink

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