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Check your DNS settings and /etc/hosts as well. You can also use
strace to see exactly what the Apache process is doing (probably
waiting for a DNS request to timeout).<br>
<br>
Ted<br>
<br>
On 1/5/2012 12:19 PM, John Pagakis wrote:
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<p class="MsoNormal"><span lang="EN">Posted by <a
moz-do-not-send="true"
href="http://drupal.org/user/1746988" title="View user
profile.">toolsmythe</a> on <em><span
style="font-family:"Calibri","sans-serif"">January
4, 2012 at 8:18pm</span></em><o:p></o:p></span></p>
<p><span lang="EN">I'm dealing with an odd performance issue on
a production Drupal 7.7 site.<o:p></o:p></span></p>
<p><span lang="EN">I have a machine that is configured thus:<o:p></o:p></span></p>
<p><span lang="EN">4gig<br>
Quad proc<br>
900GB disk<o:p></o:p></span></p>
<p><span lang="EN">OS: Debian 6 <o:p></o:p></span></p>
<p><span lang="EN">For apache we are using version<br>
ii apache2 2.2.16-6+squeeze1 Apache HTTP Server metapackage<br>
ii apache2-mpm-prefork 2.2.16-6+squeeze1 Apache HTTP Server
- traditional non-threaded model<o:p></o:p></span></p>
<p><span lang="EN">For PHP we are running version<br>
ii php5 5.3.3-7+squeeze3 server-side, HTML-embedded
scripting language (metapackage)<br>
ii libapache2-mod-php5 5.3.3-7+squeeze3 server-side,
HTML-embedded scripting language (Apache 2 module)<o:p></o:p></span></p>
<p><span lang="EN">ii mysql-client-5.1 5.1.49-3 MySQL database
client binaries<o:p></o:p></span></p>
<p><span lang="EN">Database is on a seperate server.<o:p></o:p></span></p>
<p><b><u><span lang="EN">The Problem</span></u></b><span
lang="EN"><br>
We are getting a pretty consistant 5+ second delay before
any page on the site renders. It renders quickly once it
starts to render, but there is a delay of 5 or more seconds
before that happens.<o:p></o:p></span></p>
<p><span lang="EN">Oddly enough, we have a copy of the site
running under cPanel that has no delay whatsoever. That box
is configured thus:<o:p></o:p></span></p>
<p><span lang="EN">Apache 2.2<br>
PHP 5.2.17<br>
Mod SuPHP<br>
CentOS release 5.7 (Final)<o:p></o:p></span></p>
<p><span lang="EN">Not sure if this is worthy of note, but the
production server has Suhosin (PHP hardening) and the copy
does not.<o:p></o:p></span></p>
<p><span lang="EN">We made a second copy on the prod server and
it is experiencing the same delay.<o:p></o:p></span></p>
<p><span lang="EN">All the database instances are practically
empty.<o:p></o:p></span></p>
<p><b><u><span lang="EN">What we've tried so far</span></u></b><span
lang="EN"><br>
We've tried optimizing the tables in MySQL.<o:p></o:p></span></p>
<p><span lang="EN">We've tried applying various optimizations to
Apache and MySQL recommended on Drupal pages (for example: <a
moz-do-not-send="true"
href="http://drupal.org/node/215516"
title="http://drupal.org/node/215516">http://drupal.org/node/215516</a>
and <a moz-do-not-send="true"
href="http://drupal.org/node/2601"
title="http://drupal.org/node/2601">http://drupal.org/node/2601</a>).<o:p></o:p></span></p>
<p><span lang="EN">No joy.<o:p></o:p></span></p>
<p><span lang="EN">We did an ab benchmark on both servers. as
follows:<o:p></o:p></span></p>
<p><span lang="EN">ab -n 500 -c 50 <o:p></o:p></span></p>
<p><span lang="EN">The test server showed this:<o:p></o:p></span></p>
<p><span lang="EN">Benchmarking .com (be patient)<br>
Completed 100 requests<br>
Completed 200 requests<br>
Completed 300 requests<br>
Completed 400 requests<br>
Finished 500 requests<o:p></o:p></span></p>
<p><span lang="EN">Server Software: Apache<br>
Server Hostname: .com<br>
Server Port: 80<o:p></o:p></span></p>
<p><span lang="EN">Document Path: /clients///<br>
Document Length: 18543 bytes<o:p></o:p></span></p>
<p><span lang="EN">Concurrency Level: 50<br>
Time taken for tests: 50.229747 seconds<br>
Complete requests: 500<br>
Failed requests: 0<br>
Write errors: 0<br>
Total transferred: 9663634 bytes<br>
HTML transferred: 9327129 bytes<br>
Requests per second: 9.95 [#/sec] (mean)<br>
Time per request: 5022.975 [ms] (mean)<br>
Time per request: 100.459 [ms] (mean, across all concurrent
requests)<br>
Transfer rate: 187.88 [Kbytes/sec] received<o:p></o:p></span></p>
<p><span lang="EN">Connection Times (ms)<br>
min mean[+/-sd] median max<br>
Connect: 0 0 1.0 0 9<br>
Processing: 703 4901 5312.1 3312 38328<br>
Waiting: 657 4653 4788.4 3134 33105<br>
Total: 703 4902 5312.4 3312 38330<o:p></o:p></span></p>
<p><span lang="EN">Percentage of the requests served within a
certain time (ms)<br>
50% 3312<br>
66% 4721<br>
75% 5718<br>
80% 6374<br>
90% 10416<br>
95% 14444<br>
98% 24669<br>
99% 33351<br>
100% 38330 (longest request)<o:p></o:p></span></p>
<p><span lang="EN">Meanwhile, here's the same test for our prod
server:<o:p></o:p></span></p>
<p><span lang="EN">Server Software: Apache/2.2.16<br>
Server Hostname: .com<br>
Server Port: 80<br>
Document Path: /clients//<br>
Document Length: 18760 bytes<br>
Concurrency Level: 50<br>
Time taken for tests: 314.671 seconds<br>
Complete requests: 500<br>
Failed requests: 0<br>
Write errors: 0<br>
Total transferred: 9757000 bytes<br>
HTML transferred: 9380000 bytes<br>
Requests per second: 1.59 [#/sec] (mean)<br>
Time per request: 31467.146 [ms] (mean)<br>
Time per request: 629.343 [ms] (mean, across all concurrent
requests)<br>
Transfer rate: 30.28 [Kbytes/sec] received<br>
Connection Times (ms)<br>
min mean[+/-sd] median max<br>
Connect: 0 0 0.3 0 1<br>
Processing: 11813 29570 12525.7 27341 126615<br>
Waiting: 11745 29509 12525.6 27281 126535<br>
Total: 11813 29570 12525.7 27341 126615<br>
Percentage of the requests served within a certain time (ms)<br>
50% 27341<br>
66% 31105<br>
75% 33440<br>
80% 35335<br>
90% 40918<br>
95% 47849<br>
98% 66717<br>
99% 84633<br>
100% 126615 (longest request)<o:p></o:p></span></p>
<p><span lang="EN">We tried turnning on Long Running Queries in
MySQL; it logged nothing.<o:p></o:p></span></p>
<p><span lang="EN">top showed nothing of interest.<o:p></o:p></span></p>
<p><span lang="EN">We're stumped over here (though to be quite
honest, stumping us is no great feat <grin>, at least
when it comes to Drupal). Any thoughts would be much
appreciated.<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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