[jboss-user] [Performance Tuning] - Re: Terrible performance with lot of concurrent ejb calls - SecurityActions.loadClass

[Maros Bajtos]

Maros Bajtos [http://community.jboss.org/people/maros.bajtos] created the discussion

"Re: Terrible performance with lot of concurrent ejb calls - SecurityActions.loadClass"

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We have security-domain in our jboss-app.xml, I guess that counts too. I just tried to turn off RoleBasedAuthorizationInterceptorv2 in jboss-ejb3-core.jar, but it didn't help much, I think there are more places where SecurityActions.loadClass is called. Btw I realized that the the number of ejb calls is even higher, so it's like thousands of calls - that would explain why the performance is so terrible - ClassLoader.loadClass is called so many times, that even small overhead of managing lock can degrade performance significantly (especially with many threads calling that method and blocking each other).

I think we will consider change of implementation a bit and don't use EJBs so often, but anyway, I think this extreme case is showing some performance problems very well.

I can't attach the application, since it is proprietary:( I will try to append profiler snapshots tomorrow.
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