Hi guys,

At XWiki (http://xwiki.org) we've been using Jenkins for a long time but 
we've had performance issues for a while. I've disabled the Dashboard 
plugin that we were using in order to track down the performance issues. 
But even after disabling we still have issues.

It happens that regularly and often when we navigate to a job in the UI, 
our jenkins server takes over 10 minutes to answer.

It happened to me just a few minutes ago 
at http://ci.xwiki.org/job/xwiki-platform-6.1.x/ and I was able to get 2 
thread dumps, spaced by a few minutes:
* Thread dump 1: https://gist.github.com/vmassol/361225e90113c49100b5
* Thread dump 2: https://gist.github.com/vmassol/e495d48b0dc0b14c52a0

Unfortunately I don't know Jenkin's code and it's hard for me to understand 
the problem. What I see is that a lot of threads seems to be doing 
hudson.remoting.FlightRecorderInputStream.read().

Any idea of what could be going on?

Anything I could do to help debug the issue?

Thanks a lot for any help
-Vincent Massol
XWiki Committer

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