Cyrus squatter using only a single core

[Michael Menge]

Hi,

nice does only have an influence if there are 2 or more processes
waiting for CPU-time. If the other processes are not using the cpu i
would guess that they are waiting for I/O, or are ideling.

See http://en.wikipedia.org/wiki/Nice_%28Unix%29 for more details.

Most Cyrus Processes are I/O bound and not CPU bound

Regards

    Michael Menge

Quoting "Fabio S. Schmidt" <fabio at improve.inf.br>:

> Hi Jose ! Thanks for answering !
>
> Your explanations are very appropriate and I couldn't agree more !
>
> In fact, I'm just concerned if squatter causing a high load on a core even
> when running with nice 19 is the normal behavior, but I realize that it is
> more a question about Linux than Cyrus.
>
> --
>
> My best regards,
> Fabio Soares Schmidt
>
>
>
> On 15 July 2014 16:19, Jose Luis Rodriguez Garcia <joseyluis at gmail.com>
> wrote:
>
>> I am not a cyrux expert, but why are you worried that a core is loaded?
>>
>> It means that the core is working on the task. Does the performance of the
>> server suffer because of this (response time to users, etc)?
>> I think that monitor for detect a high load in a core isn't appropriate
>> measure of performance. It can be useful for detected a hanged process that
>> takes all your cpu, or historical usages of the cores, but not for other
>> purposes.
>>
>> I think that it is more appropriate measure the total usage of cpu of the
>> server.
>>
>>
>> On Tue, Jul 15, 2014 at 6:58 PM, Fabio S. Schmidt <fabio at improve.inf.br>
>> wrote:
>>
>>> Thank you Bron ! Once I unfortunately do not have the knowledgement
>>> necessary to create this patch, I will adjust my configurations to run
>>> squatter at specific times and disable the CPU consumption trigger on my
>>> monitoring solution.
>>>
>>> Even if when running with nice 19 my squatter process causes a high load
>>> on the core which it's running, it this behavior normal?
>>>
>>> Thanks everyone for answering this thread, I know that my english is not
>>> so good but I'm trying to improve it !
>>>
>>> --
>>>
>>> My best regards,
>>> Fabio Soares Schmidt
>>>
>>>
>>>
>>> On 15 July 2014 03:03, Bron Gondwana <brong at fastmail.fm> wrote:
>>>
>>>>  Yes, all Cyrus processes are single threaded except mupdate.  I don't
>>>> think that running squatter on multiple cores would necessarily be an
>>>> improvement - and regardless, it's not a priority for me to implement.
>>>> We'd accept a patch if someone did it and it integrated with the other
>>>> stuff that's floating around on the fastmail branch.
>>>>
>>>> Bron.
>>>>
>>>>
>>>> On Tue, Jul 15, 2014, at 04:13 AM, Fabio S. Schmidt wrote:
>>>>
>>>> Hi !
>>>>
>>>> I'm running Cyrus 2.4.14 on Debian 6 64 Bits and I've noticed that when
>>>> squatter is running it only uses a single core. Has this behavior been
>>>> improved on newer versions?
>>>>
>>>> Here is my entry:
>>>>
>>>> squatter_1    cmd="/usr/bin/nice +n 19 /usr/lib/cyrus/bin/squatter -s
>>>> -i -r user" period=180
>>>>
>>>>
>>>> I do run it with "nice +19" but It causes a high load on the core it's
>>>> running and triggers an alert on my monitoring solution. I know that this
>>>> alert could be deactivated, but maybe I'm doing something wrong with
>>>> squatter.
>>>>
>>>> --
>>>>
>>>> My best regards,
>>>> Fabio Soares Schmidt
>>>>
>>>>
>>>> Linux Professional Institute - LPIC-3
>>>> Microsoft Certified Technology Specialist: Active Directory
>>>>
>>>>  ----
>>>> Cyrus Home Page: http://www.cyrusimap.org/
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>>>> To Unsubscribe:
>>>> https://lists.andrew.cmu.edu/mailman/listinfo/info-cyrus
>>>>
>>>>
>>>> --
>>>> Bron Gondwana
>>>> brong at fastmail.fm
>>>>
>>>>
>>>>
>>>> ----
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>>>
>>>
>>> ----
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>>
>>
>




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