Will jogl performance differ between jdk 1.6 on x64 or i586 linux

john.preston

Full Member

Posts: 164

Java games rock!

Will jogl performance differ between jdk 1.6 on x64 or i586 linux

« on: 2006-12-21 20:56:28 »

I'm presently running a jogl app in jdk 1.6 on top of 32 bit linux (Fedora Core 6) and want to know if I will see any difference in the jogl app if I run jdk 1.6 on top of x_64 linux.

Ken Russell

JGO Kernel

Posts: 3446
Medals: 3

Java games rock!

Re: Will jogl performance differ between jdk 1.6 on x64 or i586 linux

« Reply #1 on: 2006-12-21 21:42:00 »

I don't think so. There are various tradeoffs between x86 and x86_64; there are more machine registers available in 64-bit mode, but all pointers (including Java object references) become twice as large in the 64-bit Java HotSpot VM. In general for memory-intensive applications there is currently about a 10% performance reduction when running the 64-bit JVM compared to the 32-bit one.

Unless you really need more than 4 GB of addressable space in your application, you're probably better off sticking with the 32-bit JVM.

john.preston

Full Member

Posts: 164

Java games rock!

Re: Will jogl performance differ between jdk 1.6 on x64 or i586 linux

« Reply #2 on: 2006-12-21 21:51:18 »

So if I had an app that wanted to use a Java heap size of greater than 4GB I would need the 64 bit JVM's. The 32 bit JVM wouldn't work. Yes?

Games published by our own members! Go get 'em!

Try the Free Demo of Revenge of the Titans

Ken Russell

JGO Kernel

Posts: 3446
Medals: 3

Java games rock!

Re: Will jogl performance differ between jdk 1.6 on x64 or i586 linux

« Reply #3 on: 2006-12-22 01:55:11 »

That's correct. You'd get an error during initialization of the JVM because it wouldn't be able to support your -Xmx setting.

Pages: [1]

		Will jogl performance differ between jdk 1.6 on x64 or i586 linux (Read 793 times)
0 Members and 2 Guests are viewing this topic.