pmdamemcache(1) — Linux manual page

PMDAMEMCACHE(1)          General Commands Manual          PMDAMEMCACHE(1)

NAME         top

       pmdamemcache - memcached performance metrics domain agent (PMDA)

DESCRIPTION         top

       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         top

       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         top

       $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         top

       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         top

       PCPIntro(1) and pmcd(1).

COLOPHON         top

       This page is part of the PCP (Performance Co-Pilot) project.
       Information about the project can be found at 
       ⟨http://www.pcp.io/⟩.  If you have a bug report for this manual
       page, send it to pcp@groups.io.  This page was obtained from the
       project's upstream Git repository
       ⟨https://github.com/performancecopilot/pcp.git⟩ on 2025-08-11.
       (At that time, the date of the most recent commit that was found
       in the repository was 2025-08-11.)  If you discover any rendering
       problems in this HTML version of the page, or you believe there is
       a better or more up-to-date source for the page, or you have
       corrections or improvements to the information in this COLOPHON
       (which is not part of the original manual page), send a mail to
       man-pages@man7.org

Performance Co-Pilot               PCP                    PMDAMEMCACHE(1)

Pages that refer to this page: pmdanutcracker(1)

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