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).