server loads up and is VERY slow

A few hours I restart ispconfig_server my server slows to a crawl. It take a long time for web pages to come up and even to log into the server via ssh.

Here is one of the sites on the server
http://www.kchotspots.com/

You can see how slow it is.

I just upgraded to 2.2.21 and that did not resolve the problem.

Intel(R) Celeron(R) CPU 2.53GHz
Mem: total= 506380 used= 499848 free= 6532

I lowered a lot of the following and it seemed to help... but over a few hours the system degrades

<IfModule prefork.c>
StartServers 2
MinSpareServers 4
MaxSpareServers 8
ServerLimit 20
MaxClients 16
MaxRequestsPerChild 512
</IfModule>
<IfModule worker.c>
StartServers 2
MaxClients 150
MinSpareThreads 25
MaxSpareThreads 75
ThreadsPerChild 25
MaxRequestsPerChild 0
</IfModule>




Anyone know what might be going on and how to fix it?

 

8611 apache 25 0 66928 42m 4424 R 92.1 8.7 0:36.12 httpd

... and there isn't even any traffic ...

I opened up two terminals and looked at top with one and tail -f the access_logs ... no traffic comming in

 

Any errors in Apache's error log?
Which distribution are you using? How did you install Apache?

 

This is the tail of error_log

[Tue Apr 01 11:02:10 2008] [error] an unknown filter was not added: PHP
[Tue Apr 01 11:02:10 2008] [error] an unknown filter was not added: PHP
[Tue Apr 01 11:02:14 2008] [error] an unknown filter was not added: PHP
[Tue Apr 01 11:02:14 2008] [error] an unknown filter was not added: PHP
[Tue Apr 01 11:03:34 2008] [error] an unknown filter was not added: PHP
[Tue Apr 01 11:03:34 2008] [error] an unknown filter was not added: PHP
[Tue Apr 01 11:03:35 2008] [error] an unknown filter was not added: PHP
[Tue Apr 01 11:03:35 2008] [error] an unknown filter was not added: PHP
[Tue Apr 01 11:04:52 2008] [error] an unknown filter was not added: PHP
[Tue Apr 01 11:04:52 2008] [error] an unknown filter was not added: PHP
[Tue Apr 01 11:06:36 2008] [error] an unknown filter was not added: PHP
[Tue Apr 01 11:06:36 2008] [error] an unknown filter was not added: PHP
Allowed memory size of 33554432 bytes exhausted (tried to allocate 0 bytes)


I am using Centos 4
I installed Apache using the ISPConfig install process.

from my php.ini http://the-greenes.net/info.php
max_execution_time = 300
max_input_time = 600
memory_limit = 64M

 

http://www.howtoforge.com/forums/showpost.php?p=60042&postcount=5

Please increase the memory limit in your php.ini and restart Apache.

 

I figured out that PHP filter thing... I doubt that is causing the slowness

As far as the memory... you want me to increase it from 64M? Default php.ini is only 8M. How much does it need? I only have 512 in the system
33554432 bytes is 32mb and I had it set to 64M

 

top - 09:02:15 up 9 days, 17:05, 1 user, load average: 1.53, 1.44, 1.47
Tasks: 86 total, 2 running, 83 sleeping, 0 stopped, 1 zombie
Cpu(s): 97.7% us, 1.0% sy, 0.0% ni, 0.0% id, 1.3% wa, 0.0% hi, 0.0% si
Mem: 506380k total, 393308k used, 113072k free, 8156k buffers
Swap: 1052248k total, 81664k used, 970584k free, 255912k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
13240 apache 25 0 67796 46m 4148 R 89.4 9.3 1:25.97 httpd


I'm working on getting two more gig in it. The thing is, I don't have a lot of traffic and yet it still slows to a crawl.... after a restart of apache, it clears up for a while.

 

Do you use any .htaccess files where you set another value for the memory limit than the one in your php.ini?

 

Not that I am aware of.... Unless ISPConfig adds them.

 

which modules did your apache2 load?

I had some problems with load some days ago because of mod_security!

 

http://www.the-greenes.net/info.php

I don't see that.

Doesn't ISPConfig compile and install apache? If so, I have what ISPConfig uses.

 

Your Loaded Modules:
core prefork http_core mod_so mod_access mod_auth mod_auth_anon mod_auth_dbm mod_auth_digest util_ldap mod_auth_ldap mod_include mod_log_config mod_env mod_mime_magic mod_cern_meta mod_expires mod_deflate mod_headers mod_usertrack mod_setenvif mod_mime mod_dav mod_status mod_autoindex mod_asis mod_info mod_dav_fs mod_vhost_alias mod_negotiation mod_dir mod_imap mod_actions mod_speling mod_userdir mod_alias mod_rewrite mod_proxy proxy_ftp proxy_http proxy_connect mod_cache mod_suexec mod_disk_cache mod_file_cache mod_mem_cache mod_cgi mod_perl sapi_apache2 mod_python mod_ssl

my loaded modules:
core mod_log_config mod_logio prefork http_core mod_so mod_actions mod_alias mod_auth_basic mod_authn_file mod_authz_default mod_authz_groupfile mod_authz_host mod_authz_user mod_autoindex mod_cgi mod_dir mod_env mod_fcgid mod_include mod_mime mod_negotiation mod_php5 mod_rewrite mod_setenvif mod_ssl mod_status mod_suexec mod_unique_id

---
so i think you could a2dismod some of your modules that you (your customers) do not need! Every module takes some memory.

 

Strange... I don't seem to have a2dismod on my server... and yum can't find it to install. Where do I get this?

 

Never mind... I'll just edit the httpd.conf

 

a2dismod is a Debian/Ubuntu tool. It doesn't exist on Fedora/CentOS.