Help pinpointing high HTTPD CPU usage in TOP Post: 302265284

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Operating Systems Linux Help pinpointing high HTTPD CPU usage in TOP Post 302265284 by reborg on Saturday 6th of December 2008 11:37:47 AM

12-06-2008

Administrator Emeritus

In addition the advice from csorhand and looking at your processes it appears that you are using a LAMP configuration, so there are several things to take into account here (I am assuming the php part).

1. Examine your content, if you are serving pages that contain mixed content such as images and javascript along with dynamic php content, you might benefit from adding expiry to the static content, if client need to download less that will reduce some of your load.

Code:

        <IfModule mod_expires.c>
                ExpiresActive On
                <FilesMatch "\.(css|js|gif|jpg|jpeg|png|swf)$">
                        ExpiresDefault A2592000
                        Header Append Cache-Control "public"
                </FilesMatch>
        </IfModule>

2. Install a php cache such as xcache, eAccelerator or APC.

3. Look at this thread https://www.unix.com/web-programming-...primer-sh.html and use the tools linked to check your mysql configuration. I believe it is actually your communication with MySQL which is causing you the most problems.

4. Ensure that you have dns lookups turned off in apache:

Code:

HostnameLookups Off

Also check for "bad" pages that have nasty queries. We has on module on this site that put millions of rows in one db table, and tried to query that table every time specific pages were loaded. The server was running flat out for a few days until I managed to spot the strange behavior and truncated the table. The load went down instantly to a normal level.

reborg

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mrtg-webserver

MRTG-WEBSERVER(1)						       mrtg							 MRTG-WEBSERVER(1)

NAME

       mrtg-webserver - hints for web server configuration

SYNOPSIS

       If you want people to actually see the results of your network monitoring efforts you will need a webserver.

       This document lists some configuration hints for webservers. Contributions welcome.

APACHE

   Configuring mod_expire
       A big issue with mrtg monitoring data is the expiry time.  All these nice graphs you can create are only valid for a short time.  If you do
       not take special action some webbrowsers will not notice this and you may end up with people seeing old data because of caching issues.

       The apache module mod_expire allows you to setup special expiry properties for individual file.

       Here is an example for how this may look for an mrtg web directory.  The configuration directives can be stored into a .htaccess file.

	############################################################
	# Example .htaccess for use with apache-1.2 and mod_expire.
	# (mod_expire come with apache-1.2 but you have to explicitly
	# activate it when compiling the httpd ...)
	#############################################################
	#
	<Files "*-day.png">
	ExpiresActive On		  # enable expirations
	# five minutes
	ExpiresDefault M300
	</Files>

	<Files "*-week.png">
	ExpiresActive On
	ExpiresDefault M1800
	</Files>

	<Files "*-month.png">
	ExpiresActive On
	ExpiresDefault M7200
	</Files>

	<Files "*-year.png">
	ExpiresActive On
	ExpiresDefault M86400
	</Files>

	<Files "*.html">
	ExpiresActive On
	ExpiresDefault M300
	</Files>

	# index.html is not automatically generated
	<Files "index.html">
	ExpiresActive Off
	</Files>

AUTHOR

       Unknown

2.17.4								    2012-01-12							 MRTG-WEBSERVER(1)