Apache Mysql MaxClients

Question

I have running system on centos + apache + mysql with "Bitrix" CMS (Russian local CMS).

Some times system goes CPU overload and apache log message "Max Client reached". After restartig httpd daemon CPU utilisation becomes OK. ab 20-30%. At first i think it was memory leaks. But then i reduce mysql memory and now i have ab. 2GB free RAM min.

My apache settings:

<IfModule mpm_prefork_module>
  StartServers        32
  MinSpareServers     32
  MaxSpareServers     32
  MaxClients          64
  MaxRequestsPerChild 5000
</IfModule>

<IfModule worker.c>
        StartServers         2
        MaxClients         300
        MinSpareThreads     25
        MaxSpareThreads     75
        ThreadsPerChild     25
        MaxRequestsPerChild  2500
</IfModule>

on my shame i did not realize difference between this modules. My system config: 16 GB RAM, 1 HTTPD procces eats 50-150MB, max users online 200-250 at one moment.

Why CPU goes overload when connections reaches maxclients value? What am i doing wrong? Thx!

htop when CPU overloads and MaxClients reaches some value CPU overloading looks like this

after this post i found out that im using prefork httpd -V | grep MPM Server MPM: Prefork -D APACHE_MPM_DIR="server/mpm/prefork" — Николай Булашев, Jul 21 '15 at 05:41
I'm voting to migrate the question to [se], it's off topic for SO. — Gerald Schneider, Jul 21 '15 at 06:08
Find my answer and script for maxclient calculator: https://stackoverflow.com/questions/18761239/apache-server-reached-maxclients-setting-consider-raising-the-maxclients-settin — Mohammad Azam, Oct 03 '17 at 21:25

Apache Mysql MaxClients

0 Answers0