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https://issues.apache.org/jira/browse/FELIX-5665?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16101973#comment-16101973
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AnilKumar Attuluri commented on FELIX-5665:
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[~karlpauls]
I have created a gradle project here:
https://github.com/anilutcs/osgi-reflection-test
It has the instructions to build, run (on karaf) and test.
Here are the findings that might be helpful:
Its the apache log4j library that tries to load the class
*_sun.reflect.GeneratedMethodAccessor<number>_* which ends up in the method
*BundleWiringImpl.findClassOrResourceByDelegation* which in turn ends up
looking up for that class everywhere (boot delegation, current class loader,
search imports and including the dynamic imports) and then throws a
*ClassNotFoundException*.
So obviously its CPU expensive since this happens several times for every app
call. Let me know if there is a hack to delegate this to some other class
loader without impacting the current class loading. Apparently boot delegation
didn't work.
> High CPU usage on
> org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation
> ---------------------------------------------------------------------------------------------
>
> Key: FELIX-5665
> URL: https://issues.apache.org/jira/browse/FELIX-5665
> Project: Felix
> Issue Type: Bug
> Affects Versions: framework-5.6.4
> Reporter: AnilKumar Attuluri
> Attachments: IMG_1.jpg, IMG_2.jpg
>
>
> We have been running some performance tests to prepare our OSGi bundle
> (*running in Apache Karaf*) for production.
> Just to give some background about our OSGi bundle, we converted an existing
> Spring application into an OSGi bundle with all the current dependencies
> packaged into the bundle as an uber artifact.
> When we run >= 500 TPS (each of these calls results in a http call made via a
> library) we run into this high CPU usage spikes reaching up to 100% CPU.
> Please see the image attached, the spikes in the image are 100% CPU usage
> while the average is about 40%. Also see the CPU sampler image which points
> to
> *org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation*
> Is there an existing bug/documentation that already captures this?
> We don't see this behavior when we run the same app in standalone JVM.
>
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