Performance issue

[Reshma Reddy]

Hi all,
How to increse performance of a simple java program, i heard some parameters is there to increse performance, Please help me on this .

Regards,
vardhan

[Piet Verdriet]

You can provide some parameters at compile time to increase how much memory that JVM can consume, which (might) increase the performance of your application.

More details about it can be found here:
http://java.sun.com/javase/technologies/hotspot/vmoptions.jsp

[Peter Johnson]

Changing JVM command line options without knowing what you are doing is a recipe for disaster. I have a presentation that describes the heap and garbage collection and how to tune the heap sizes. Also, JBoss in Action has a chapter on performance, most of which applies to all Java apps, not just to JBossAS. I go into more detail on heap tuning in that chapter.

[Ulf Dittmer]

More fundamentally, performance is unlikely to be improved greatly by tuning a few parameters. The architecture and design of the system, as well as the algorithms used, have a much bigger impact.

[Manuel Leiria]

Originally posted by Peter Johnson:
Changing JVM command line options without knowing what you are doing is a recipe for disaster. I have a presentation that describes the heap and garbage collection and how to tune the heap sizes. Also, JBoss in Action has a chapter on performance, most of which applies to all Java apps, not just to JBossAS. I go into more detail on heap tuning in that chapter.

Very nice presentation Peter!!

Cheers,

[Anirudh Vyas]

Wow, Peter that presentation is awesome! I have read on garbage collector from Sun's link (cant seem to get it now), but this presentation makes it better, more illustrative and easy to follow.

Good deal! appreciate you sharing it!

Regards
Vyas, Anirudh