Re: Performance / AB issue?

On Fri, May 11, 2012 at 9:53 AM, Camilo Sperberg <unreal4u@gmail.com> wrote: > > > Sent from my iPhone 5 Beta [Confidential use only] > > On 11 mei 2012, at 07:09, "Lars Nielsen" <lars@lfweb.dk> wrote: > >> >>> >>> On 10 mei 2012, at 23:26, Lars Nielsen wrote: >>> >>>> >>>>> >>>>> >>>>> Sent from my iPhone 5 Beta [Confidential use only] >>>>> >>>>> On 10 mei 2012, at 17:40, Matijn Woudt <tijnema@gmail.com> wrote: >>>>> >>>>>> On Thu, May 10, 2012 at 9:04 AM, Lars Nielsen <lars@lfweb.dk> 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 >>>>>> >>>>>> -- >>>>>> PHP General Mailing List (http://www.php.net/) >>>>>> To unsubscribe, visit: >>>>>> http://www.php.net/unsub.php >>>>>> >>>>> >>>>> 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. >>>> >>>> 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? >>>> >>>> But if I restart apache then it works again... So I guess it is a >>>> apache/php configuration issue? >>>> >>>> -- >>>> Med venlig hilsen / Best Regards >>>> >>>> LFWeb >>>> Lars Nielsen >>>> Thorsensvej 30 >>>> 4800 Nykøbing Falster >>>> Tlf: +45 20 64 85 76 >>>> email : lars@lfweb.dk >>>> www : http://www.lfweb.dk >>>> >>>> >>>> -- >>>> PHP General Mailing List (http://www.php.net/) >>>> To unsubscribe, visit: http://www.php.net/unsub.php >>>> >>> >>> Have you tried benchmarking a really simple php page, such as >>> >>> <?php echo 'hello world'; ?> >>> >>> ? >>> >>> It that works, than it is definitely an issue in Drupal's configuration >>> and not in PHP/Apache. Additionally, you could check what happens when you >>> try to establish a session or make a database call to rule out those as >>> well, just make really simple tests that you know wouldn't fail and run ab >>> on them. >>> >>> Greetings. >>> >>> >>> -- >>> PHP General Mailing List (http://www.php.net/) >>> To unsubscribe, visit: http://www.php.net/unsub.php >>> >>> >> Thanks! >> >> Now I have made >> <?php >>  echo "Hey from PHP!"; >> ?> >> >> It runs fine from a little concurrency. But with "-c 5 -n 500" it fails >> after 308 requests! >> >> >> >> Best Regards / Med venlig hilsen >> >> LFWeb >> Lars Nielsen >> >> >> -- >> PHP General Mailing List (http://www.php.net/) >> To unsubscribe, visit: http://www.php.net/unsub.php >> > > Have you tried benchmarking from localhost? Do you have any active firewall? Selinux? > Shorewall? Anything that could block a ddos attack? > A firewall is not the case here. He's testing with -c 2 and is getting errors, with -c 50 on a static file not. Also, blocking a DDOS attack at only 50 connections is way too low, so I don't think that would happen. - Matijn