AW: Random latency in reentrant calls (Bug 57916) [wd-vc]

["Bremser, Kurt (AMOS Austria GmbH)" <Kurt.Bremser@xxxxxxxxxx>]

Maybe it's a storage problem when paging space is allocated?

 

Kurt Bremser

AMOS Austria

 

Newton was wrong. There is no gravity. The Earth sucks.

---

Von: Luc Andre [landre3567@xxxxxxxxx]
Gesendet: Dienstag, 12. Mai 2015 12:28
An: users@xxxxxxxxxxxxxxxx
Betreff: Re: Random latency in reentrant calls (Bug 57916) [wd-vc]

Yes, but I'm still very surprised that spinning a new process can take up to 2 seconds on a powerful server :-( 

On Tue, May 12, 2015 at 12:26 PM, Yann Ylavic <ylavic.dev@xxxxxxxxx> wrote:

So is it working as expected now?

On Tue, May 12, 2015 at 12:07 PM, Luc Andre <landre3567@xxxxxxxxx> wrote:
> My mistake, apache2.conf is overridden by  /mods-enabled/mpm_prefork.conf
>
> sorry about that...
>
>
>
>
> On Tue, May 12, 2015 at 12:03 PM, Luc Andre <landre3567@xxxxxxxxx> wrote:
>>
>> php_sapi_name: apache2handler
>>
>>
>> Server MPM:     prefork
>>
>> I tried
>>
>>     StartServers          20
>>     MinSpareServers       20
>>     MaxSpareServers      20
>>
>> And after restarting apache still have the issue but only after waiting
>> about a minute between 2 tries.
>>
>> Then I did a "ps -ef | grep apache" and I discovered that I have only 11
>> apache processes running !
>>
>> So it seems that MinSpareServers and StartServers  are ignored and the
>> problem is really a child spin up issue.
>>
>> Regards,
>>
>> Luc
>>
>>
>>
>>
>>
>>
>> On Tue, May 12, 2015 at 11:16 AM, Rainer Canavan
>> <rainer.canavan@xxxxxxxxxxxx> wrote:
>>>
>>>
>>>
>>> 2015-05-12 10:03 GMT+02:00 Luc Andre <landre3567@xxxxxxxxx>:
>>>>
>>>> Thanks for your reply.
>>>>
>>>> We did a test on a powerful server with
>>>>
>>>>     StartServers          20
>>>>     MinSpareServers       5
>>>>     MaxSpareServers      20
>>>>
>>>> And we still have the issue...
>>>
>>>
>>> To ensure that you don't hit the child spin up issue, you'll have to set
>>> MinSpareServers to a value equal to or greater than the number of processes
>>> you need for your test, I'd recommend 20 in this case, just to be sure. Are
>>> you sure that you're using the prefork mpm, and therefore those settings are
>>> actually relevant? If you don't have a good reason to use prefork, you may
>>> get better performance with worker or event (but be sure to tune the
>>> associated settings, such as ThreadsPerChild appropriately)
>>>
>>> Additionally, you don't specify how your PHP is configured. If you're
>>> using PHP-FPM, you need to ensure that pm.start_servers and
>>> pm.min_spare_servers are large enough as well.
>>>
>>> rainer
>>
>>
>

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