Problem on multiple CPU Solaris 9 machine

[aschbacher]

Hello,

we try to run JBoss 4.0.3 on Solaris 9, on a 24 CPU Fujitsu/Siemens.
It works perfectly using Java 1.4, but with Java 1.5/1.6 the JBoss process consumes up to 35% CPU time (8 CPUs of the 24 available!) during startup.
(We then kill the process(after 2/3 minutes), it would finally make the machine totally unavailable)

We have no problems running the same installation on a 2-CPU Solaris 9 machine aswell as on the WinXP computers we use for development.

I guess Java 1.6 may not be supported by version 4.0.3 but 1.5 should work without any problems, right?

Any help/ideas greatly appreciated

thanks in advance

Karl

[peterj]

Two thoughts.

1) You should take several thread dumps, spaced a few seconds apart, to see what the app server is doing during startup.

2) You should ask about this in the Solaris forum (or ask Sun support). Most likely it is an issue pertaining to the Sun JVM and its interaction with Solaris. (Sounds like CPU cache trashing to me, I recommend also setting processor affinity so that the app server runs on at most 4 CPUs, but I don't know how to do that in Solaris.)

[aschbacher]

Hi Peter,
a little late but thanks for your suggestions.

It finally turned out that there is parameter called UseLargePages, that exists since jdk1.5.
This parameter is inactive on Windows/Linux etc. per default, but active on Solaris. Setting this parameter to inactive solved the problem.
see http://java.sun.com/javase/technologies/hotspot/largememory.jsp