Topic: Apache Tuning

[r00t4u]

Hi Friends, This regarding tuning apache. I am running 100+ LAMP on VPS. But few of them are crashing becoz it reaches to the MaxClient Limit. I thought of Tuning. Here are the specs:

OS: OpenSuse 10
Apache: Apche/2.2.8
PHP: PHP 5.x
RAM: 1GB
Assuming 80% of it has been occupied by webserver (apache)


Apache Settings: These are pretty old settings. I have doubt that these needs to be recompile.

# prefork MPM
StartServers 50
MinSpareServers 5
MaxSpareServers 100
ServerLimit 50
MaxClients 50
# worker MPM
StartServers 50
MinSpareThreads 5
MaxSpareThreads 100
ThreadLimit 128
MaxClients 50
ThreadsPerChild 75
MaxRequestsPerChild 10000

whenever i run
ps -eLf|grep httpd |wc -l
It alwasys give me = 52 and in the peak hours something apache crashes saying reached the Maximun Client size.

No as per the thumb rule.

MaxClients ≈ (RAM - size_all_other_processes)/(size_apache_process)
which is like
MaxClients ≈ (RAM dedicated to Apache)/(Average of apache process)
Numbers:

MaxClients ≈ Total Ram 1GB - 20% for other process/ Average of RSS (1226304) in KB offcource.

(Note: For RSS i an doing ps -ulC httpd --sort:rss, and calculating the average of all 52 process)

Now, Here is the problem when i do all this calculation, i end up with a result that i am using less RAM, which is quite a numb because these servers are running for last few years with no problem.

So, i was wondering if you guys can give me some direction for the tunning..thasn that would be help.

[James Blond]

It depends if you use prefork or worker or event mpm