pmdamemcache

Langue: en

Version: Performance Co-Pilot (debian - 07/07/09)

Section: 1 (Commandes utilisateur)

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).