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Operating Systems Linux Help pinpointing high HTTPD CPU usage in TOP Post 302265183 by csorhand on Friday 5th of December 2008 09:31:21 PM
Old 12-05-2008
pspace,

You can check your httpd service if your using prefork or worker by typing

httpd -V and look for "-D APACHE_MPM_DIR="server/mpm/prefork"
that means your using prefork. if your MPM is worker then adjust instead of the prefork

<IfModule prefork.c>
StartServers 16
MinSpareServers 16
MaxSpareServers 64
ServerLimit 512
MaxClients 512
MaxRequestsPerChild 4000
</IfModule>


Bigger settings doesnt mean good for server. Your settings is a bloated at prefork settings and also workers MPM.

Please take a look at this site. or research more in performance tuning.

(dv) HOWTO: Basic Apache performance tuning (httpd))

Just to give you idea, 1 httpd process sometimes consumes about 128 MB of your memory and based on your settings if you started 16 httpd process(startservers) multply by 128 MB plus additional 16 more (min spare) thats a lot of memory consumption. I never include the max clients that is allowed.

So bigger is not always good for settings in apache.conf. You can google for apache performance to look for more answer. Cheers
 

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HTTPD(8)							       httpd								  HTTPD(8)

NAME
httpd - Apache Hypertext Transfer Protocol Server SYNOPSIS
httpd [ -d serverroot ] [ -f config ] [ -C directive ] [ -c directive ] [ -D parameter ] [ -e level ] [ -E file ] [ -k start|restart|grace- ful|stop|graceful-stop ] [ -h ] [ -l ] [ -L ] [ -S ] [ -t ] [ -v ] [ -V ] [ -X ] [ -M ] [ -T ] On Windows systems, the following additional arguments are available: httpd [ -k install|config|uninstall ] [ -n name ] [ -w ] SUMMARY
httpd is the Apache HyperText Transfer Protocol (HTTP) server program. It is designed to be run as a standalone daemon process. When used like this it will create a pool of child processes or threads to handle requests. In general, httpd should not be invoked directly, but rather should be invoked via apachectl on Unix-based systems or as a service on Win- dows NT, 2000 and XP and as a console application on Windows 9x and ME. OPTIONS
-d serverroot Set the initial value for the ServerRoot directive to serverroot. This can be overridden by the ServerRoot directive in the configu- ration file. The default is /usr. -f config Uses the directives in the file config on startup. If config does not begin with a /, then it is taken to be a path relative to the ServerRoot. The default is /etc/apache2/httpd.conf. -k start|restart|graceful|stop|graceful-stop Signals httpd to start, restart, or stop. See Stopping Apache httpd for more information. -C directive Process the configuration directive before reading config files. -c directive Process the configuration directive after reading config files. -D parameter Sets a configuration parameter which can be used with <IfDefine> sections in the configuration files to conditionally skip or process commands at server startup and restart. Also can be used to set certain less-common startup parameters including -DNO_DETACH (prevent the parent from forking) and -DFOREGROUND (prevent the parent from calling setsid() et al). -e level Sets the LogLevel to level during server startup. This is useful for temporarily increasing the verbosity of the error messages to find problems during startup. -E file Send error messages during server startup to file. -h Output a short summary of available command line options. -l Output a list of modules compiled into the server. This will not list dynamically loaded modules included using the LoadModule directive. -L Output a list of directives provided by static modules, together with expected arguments and places where the directive is valid. Directives provided by shared modules are not listed. -M Dump a list of loaded Static and Shared Modules. -S Show the settings as parsed from the config file (currently only shows the virtualhost settings). -T (Available in 2.3.8 and later) Skip document root check at startup/restart. -t Run syntax tests for configuration files only. The program immediately exits after these syntax parsing tests with either a return code of 0 (Syntax OK) or return code not equal to 0 (Syntax Error). If -D DUMP_VHOSTS is also set, details of the virtual host con- figuration will be printed. If -D DUMP_MODULES is set, all loaded modules will be printed. -v Print the version of httpd, and then exit. -V Print the version and build parameters of httpd, and then exit. -X Run httpd in debug mode. Only one worker will be started and the server will not detach from the console. The following arguments are available only on the Windows platform: -k install|config|uninstall Install Apache httpd as a Windows NT service; change startup options for the Apache httpd service; and uninstall the Apache httpd service. -n name The name of the Apache httpd service to signal. -w Keep the console window open on error so that the error message can be read. Apache HTTP Server 2018-07-06 HTTPD(8)
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