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https://issues.apache.org/jira/browse/FELIX-5665?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16086230#comment-16086230
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Karl Pauls commented on FELIX-5665:
-----------------------------------
[~aattuluri], yes, more details would be nice.
In general, this looks like for whatever reasons your bundle causes a lot of
either classloads or resource look-ups via the classloader. Without more
information it is hard to say whether that is what always happens but it just
so happens that this is more costly inside OSGi/Felix (which might very well be
the case as we have to do more work to figure out where something is coming
from) or whether there is something your bundle triggers inside Felix that
causes the class/resource loads. As you mention http class it might be that the
URLHandlers are involved...
Can you maybe try to boil it down to something you can share with me or at a
minimum give more information about what happens exactly?
Furthermore (just to rule out the simple case), does your bundle have a
Dynamic-ImportPackage: * (and if so, can you take it out and see if that helps)?
> 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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