Strange load issue with 2.4.17

[Geoff Winkless]

Apologies if I'm misreading, but that bug suggests many processes are
created over a period of time. In contrast your grab shows the number of
processes hasn't grown but the load has grown exponentially.

I'd say it's not the same bug.

The grab shows system CPU staying around the same, contrary to your
description - which of them is correct? If load has increased while the CPU
has dropped, I'd say you're still waiting on IO.

On 13 October 2014 15:35, Sebastian Hagedorn <Hagedorn at uni-koeln.de> 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?
>
> Thanks
> Sebastian
> --
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