Centos – Limiting the Size of Apache HTTPD Memory Footprint

apache-httpdcentosmemory

I have a web server running Cent OS 5 with Apache. I have over 1GB of Ram and the MaxSpareServers set to 15. This would be fine under most situations, but for some reason my httpd processes are ballooning to over 150 mb a piece. I was googling around and saw a program called GTop and tried that, but I couldn't find any good tutorials on how to install it. Are there any simple ways to accomplish this?

Am I headed in the right direction or is there a better way to solve this problem?

Best Answer

The 150MB is not apiece. It's almost certainly mostly shared. What you're saying doesn't suggest a problem.

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Here's what I've done to 'solve' it:

Set MaxClients 7 (based on (1740.8Mb Memory on server - 900Mb for MySQL + other stuff) / 111Mb average usage per httpd process = 7.5747747747747747747747747747748)

Therefore:

<IfModule prefork.c>
StartServers       8
MinSpareServers    5
MaxSpareServers   20
ServerLimit      256
MaxClients         7
MaxRequestsPerChild  4000
</IfModule>

Disable all Apache modules except for authz_host_module, log_config_module, expires_module, deflate_module, setenvif_module, mime_module, autoindex_module, negotiation_module, dir_module, alias_module, rewrite_module, php5_module
Remove the mod_ssl package since the client isn't using https:// whatsoever.

I'll report back once this new configuration has been running a while to see if this solves it.

Some inspiration here was borrowed from: http://www.activoinc.com/blog/2009/08/31/performance-optimized-httpd-conf-for-magento-ecommerce/ and http://www.activoinc.com/downloads/httpd.conf-magento

Best Answer

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