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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)
