HW Raid poor io performance Post: 302461304

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LEARN ABOUT CENTOS

pmdamemcache

PMDAMEMCACHE(1) 					       Performance Co-Pilot						   PMDAMEMCACHE(1)

NAME

       pmdamemcache - memcache performance metrics domain agent (PMDA)

DESCRIPTION

       This PMDA extracts performance data from memcached, a distributed memory caching daemon commonly used to improve web serving performance.
       A farm of memcached processes over multiple servers can be utilised by a single web application, increasing the total available object
       cache size, and decreasing the database load associated with smaller cache sizes.  This system is described in detail at
       http://www.danga.com/memcached.

INSTALLATION

       Configure pmdamemcache to extract the values from set of hosts used in the memcache farm.  These hosts can be listed in the
       $PCP_PMDAS_DIR/memcache/memcache.conf file, in the format (i.e.	Perl array) described at the top of pmdamemcache.pl.  A custom refresh
       rate can also be configured using this mechanism.

	       # cd $PCP_PMDAS_DIR/memcache
	       # [ edit memcache.conf ]

       Once this is setup, you can access the names and values for the memcache performance metrics by doing the following as root:

	       # cd $PCP_PMDAS_DIR/memcache
	       # ./Install

       If you want to undo the installation, do the following as root:

	       # cd $PCP_PMDAS_DIR/memcache
	       # ./Remove

       pmdamemcache is launched by pmcd(1) and should never be executed directly.  The Install and Remove scripts notify pmcd(1) when the agent is
       installed or removed.

FILES

       $PCP_PMDAS_DIR/memcache/memcache.conf
	   configuration file listing monitored memcache instances

       $PCP_PMDAS_DIR/memcache/Install
	   installation script for the pmdamemcache agent

       $PCP_PMDAS_DIR/memcache/Remove
	   undo installation script for the pmdamemcache agent

       $PCP_LOG_DIR/pmcd/memcache.log
	   default log file for error messages from pmdamemcache

SEE ALSO

       pmcd(1) and memcached(1).

3.8.10							       Performance Co-Pilot						   PMDAMEMCACHE(1)