Re: Performance / AB issue?

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On Thu, May 10, 2012 at 11:26 PM, Lars Nielsen <lars@xxxxxxxx> wrote:
>
>>
>>
>> Sent from my iPhone 5 Beta [Confidential use only]
>>
>> On 10 mei 2012, at 17:40, Matijn Woudt <tijnema@xxxxxxxxx> wrote:
>>
>>> On Thu, May 10, 2012 at 9:04 AM, Lars Nielsen <lars@xxxxxxxx> wrote:
>>>> Hi there,
>>>>
>>>> I have apache-2.22/php 5.3.10 set up on a dedicated server but I have a
>>>> strange issue.
>>>>
>>>> I have made a Drupal 7 site with a mysql db.
>>>>
>>>> If I stress-test the site with : ab -c 1 -n 150 http://sitename/ it
>>>> works
>>>> fine.
>>>> If I stress-test the site with : ab -c 2 -n 20 http://sitename/ it
>>>> kills
>>>> apache.
>>>> If I stress-test the site with : ab -c 50 -n 1500
>>>> http://sitename/static.html it works fine.
>>>>
>>>> I have set apache's errorlog to debug. But it writes nothing, either in
>>>> the virtualhost or in the server-file.
>>>>
>>>> Can anyone give a hint about what can be wrong?
>>>>
>>>>
>>>
>>> What do you mean with 'kills apache', does it terminate apache or does
>>> apache hang (eg. 100% cpu), and respond normal after the stress test
>>> is over?
>>> And what is the index of your site? A php script, or..? Do you have
>>> ModRewrite redirects etc?
>>>
>>> - Matijn
>>>
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>>> PHP General Mailing List (http://www.php.net/)
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>>>
>>
>> Can you visit the site normally? Try less verbosing in apache, that is
>> pretty intensive, but as you can benchmark a static file well (with
>> moderate high settings), i assume it is some configuration problem in
>> drupal.
>>
>> Greeting.
>> --
>> PHP General Mailing List (http://www.php.net/)
>> To unsubscribe, visit: http://www.php.net/unsub.php
>>
>>
>
> Hi,
>
> I can visit the site normaly, but with 2-3 concurrent ab test it fails.
> seen from 'ps' and 'htop' it seems that both apache and mysql continues to
> run normaly but it doesnt respond.
>

That sounds like a deadlock or something.. It's also possible it is
waiting for MySQL to respond and some deadlock might happen there

> If i run netstat -an after the test it shows this :
> Active Internet connections (servers and established)
> Proto Recv-Q Send-Q Local Address           Foreign Address  State
> tcp        0      0 0.0.0.0:22              0.0.0.0:*        LISTEN
> tcp        0      0 127.0.0.1:25            0.0.0.0:*        LISTEN
> tcp        0      0 127.0.0.1:3306          0.0.0.0:*        LISTEN
> tcp        0      0 0.0.0.0:80              0.0.0.0:*        LISTEN
> tcp        1      0 x.x.x.x:80        x.x.x.x:39237   CLOSE_WAIT
> tcp        1      0 x.x.x.x:80        x.x.x.x:39236    CLOSE_WAIT
> tcp        0      0 x.x.x.x:22        x.x.x.x:47383    ESTABLISHED
> tcp        0      0 127.0.0.1:80            127.0.0.1:34775
> ESTABLISHED
> tcp        1      0 x.x.x.x:80        x.x.x.x:39300    CLOSE_WAIT
> ESTABLISHED
> tcp        0      0 127.0.0.1:34775         127.0.0.1:80
> ESTABLISHED
> tcp        0      0 x.x.x.x:80        x.x.x.x:39330    ESTABLISHED
> tcp6       0      0 :::22                   :::*                    LISTEN
> tcp6       0      0 ::1:25                  :::*                    LISTEN
>
> So it does seem like there should be room for new tcp connections?

even 10.000 connections at the same time should be fine

>
> But if I restart apache then it works again... So I guess it is a
> apache/php configuration issue?
>

Did you try to run ab from the same server (with http://localhost/) too?
Also, are you running any optimization stuff, like memcached?

- Matijn

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