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From Paras pradhan <pradhanpa...@gmail.com>
Subject [users@httpd] High load apache
Date Wed, 08 Sep 2010 19:42:28 GMT
Hi,

Looking for recommendations.

I need to serve 100-200+ concurrent users to provide php based webmail
client (horde). I have setup memcached and php-fastcgid for this purpose.
The server has four 2.2G AMD optereon cores with 8GB of memory. I am doing
stress test using ab as: ab -t 36000 -c 100 https://url/h/imp/login.php.
What I have noticed if the number of concurrent users are more than around
25, I get the sluggish performance and I can see linux load rising high to
25 to 30 and all the cpu cores are approximately 75% used.

This is what I have in config files:

mpm worker:
--
<IfModule worker.c>
StartServers         15
MaxClients         960
MinSpareThreads     75
MaxSpareThreads     150
ThreadsPerChild     64
MaxRequestsPerChild  5000
--

memcached: 4GB

---

fcgid:

<IfModule !mod_fastcgi.c>
  AddHandler fcgid-script .fcgi
  MaxRequestsPerProcess 10000
  MaxProcessCount       100
  IPCCommTimeout        240
  IdleTimeout           240
  ProcessLifeTime 300
  BusyTimeout 300
  DefaultMaxClassProcessCount 100
  DefaultMinClassProcessCount 50

</IfModule>
---

php-fcgid:

# Number of PHP childs that will be launched. Leave undefined to let PHP
decide.
#    DefaultInitEnv PHP_FCGI_CHILDREN 4

# Maximum requests before a process is stopped and a new one is launched
    DefaultInitEnv PHP_FCGI_MAX_REQUESTS 10000
----
OS: RHEL 5.5
Apache: 2.2.3
PHP: 5.1
Mysql: 5.0


Will appreciate for any inputs.

Thanks!
Paras.

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