Strange load issue with 2.4.17

[Michael Menge]

Hi,

Quoting Sebastian Hagedorn <Hagedorn at uni-koeln.de>:

> --On 13. Oktober 2014 17:39:23 +0200 Simon Matter  
> <simon.matter at invoca.ch> wrote:
>
>>> --On 13. Oktober 2014 17:35:25 +0200 Simon Matter
>>> <simon.matter at invoca.ch> 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?


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