Strange load issue with 2.4.17

[Sebastian Hagedorn]

Hi,

for the last week we have seen strange load issues on our Cyrus server. All 
of a sudden the load increases to several thousands, user CPU goes down to 
basically zero, system CPU spikes. In the past we've had trouble with poor 
I/O performance, but that went along with an increase in Wait I/O. We don't 
see that now. vmstat shows a massive increase in context switches. When the 
system reaches this state, all we can do is restart Cyrus or reboot the 
machine if that doesn't work anymore.

I'm attaching a Ganglia screenshot that shows the problem clearly. When the 
problem exists, there's not much we can do to analyze it. A colleague 
suggested that what we see could be related to this bug:

https://bugzilla.cyrusimap.org/show_bug.cgi?id=3744

It was reported for 2.4.16, and it sounds as if it has been fixed, but is 
that fix really part of 2.4.17? Any other ideas?

Thanks
Sebastian
-- 
    .:.Sebastian Hagedorn - Weyertal 121 (Gebäude 133), Zimmer 2.02.:.
                 .:.Regionales Rechenzentrum (RRZK).:.
   .:.Universität zu Köln / Cologne University - ✆ +49-221-470-89578.:.
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