Re: Strange load issue with 2.4.17

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Hi,

Quoting Sebastian Hagedorn <Hagedorn@xxxxxxxxxxxx>:

--On 13. Oktober 2014 17:39:23 +0200 Simon Matter <simon.matter@xxxxxxxxx> wrote:

--On 13. Oktober 2014 17:35:25 +0200 Simon Matter
<simon.matter@xxxxxxxxx> wrote:

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?

Is this a physical host or running virtualized?

It's virtualized, but it's been that way for more than a year.

Is this by any chance running on KVM, maybe on an AMD cpu?

No, it's VMware ESX on Intel CPUs.

How is the memory usage? Is the system swaping?


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M.Menge                                Tel.: (49) 7071/29-70316
Universität Tübingen                   Fax.: (49) 7071/29-5912
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