1PMDAMEMCACHE(1)             General Commands Manual            PMDAMEMCACHE(1)
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NAME

6       pmdamemcache - memcached performance metrics domain agent (PMDA)
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DESCRIPTION

9       This  PMDA extracts performance data from memcached, a distributed mem‐
10       ory caching daemon commonly used to improve web serving performance.  A
11       farm  of memcached processes over multiple servers can be utilised by a
12       single web application, increasing the  total  available  object  cache
13       size,  and  decreasing  the database load associated with smaller cache
14       sizes.  This system is described in detail at http://www.danga.com/mem‐
15       cached.
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INSTALLATION

18       Configure  pmdamemcache to extract the values from set of hosts used in
19       the  memcache  farm.   These  hosts  can  be  listed  in  the  $PCP_PM‐
20       DAS_DIR/memcache/memcache.conf  file,  in the format (i.e.  Perl array)
21       described at the top of pmdamemcache.pl.  A  custom  refresh  rate  can
22       also be configured using this mechanism.
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24            # cd $PCP_PMDAS_DIR/memcache
25            # [ edit memcache.conf ]
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27       Once  this  is  setup, you can access the names and values for the mem‐
28       cache performance metrics by doing the following as root:
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30            # cd $PCP_PMDAS_DIR/memcache
31            # ./Install
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33       If you want to undo the installation, do the following as root:
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35            # cd $PCP_PMDAS_DIR/memcache
36            # ./Remove
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38       pmdamemcache is launched by pmcd(1) and should never  be  executed  di‐
39       rectly. The Install and Remove scripts notify pmcd(1) when the agent is
40       installed or removed.
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FILES

43       $PCP_PMDAS_DIR/memcache/memcache.conf
44           optional configuration file listing monitored memcache instances
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46       $PCP_PMDAS_DIR/memcache/Install
47           installation script for the pmdamemcache agent
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49       $PCP_PMDAS_DIR/memcache/Remove
50           undo installation script for the pmdamemcache agent
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52       $PCP_LOG_DIR/pmcd/memcache.log
53           default log file for error messages from pmdamemcache
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PCP ENVIRONMENT

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

63       PCPIntro(1) and pmcd(1).
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67Performance Co-Pilot                  PCP                      PMDAMEMCACHE(1)
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