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  Clip slower on 64-bit JRE's  (Read 2056 times)
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Offline BoBear2681

JGO Coder


Medals: 18



« Posted 2010-06-16 13:54:28 »

HI everybody,

I've been playing javax.sound.sampled.Clips like this:

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public void play(final String key) {
//new Thread() { @Override public void run() {
  Clip clip = clips.get(key);
   if (clip!=null) {
      clip.stop();
      clip.setFramePosition(0);
      clip.start();
   }
//}}.start();
}


I'm testing on a Core 2 Duo, 4GHz, so the machine is plenty fast.  My game is running at 30 fps, and I'm noticing a big performance difference when using a 32-bit JRE vs. a 64-bit one.

I'm currently playing a sound each time the user presses a key.  If the user holds down the key, that sound plays repeatedly, as quickly as possible.  When running on a 32-bit JRE, this works fine, and the game stays at a solid 30 fps.  When running on a 64-bit JRE, however, performance drops to 15 fps.  I tested with a 1.5 and 1.6 JRE for both levels of bitness, and the result is the same.

Any idea what's causing this?  Am I doing something wrong?  I notice that when I run the sound effect in a thread (using the commented out lines), I don't have this performance drop in 64-bit.  Is this a bad workaround - launching (possibly) 30 threads per second, albeit short-lived threads?
Offline sproket

Junior Member


Medals: 1



« Reply #1 - Posted 2010-06-22 00:01:51 »

Hmm. I see something similar as well. Your best bet would be to post on the java forums at sun/oracle. They have a javax.media section.

Offline BoBear2681

JGO Coder


Medals: 18



« Reply #2 - Posted 2010-06-23 18:54:48 »

Aye, I just thought I'd try here first since the folks here are pretty smart and responses often come pretty quickly.  I'll post over there and if I get a response I'll post the solution back here.
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