NAME

       pmdamemcache - memcached 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
           optional 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

PCP ENVIRONMENT

       Environment variables with the prefix PCP_ are used to parameterize the file and directory
       names  used by PCP. On each installation, the file /etc/pcp.conf contains the local values
       for these variables.  The $PCP_CONF  variable  may  be  used  to  specify  an  alternative
       configuration file, as described in pcp.conf(5).

SEE ALSO

       PCPIntro(1) and pmcd(1).