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PMDASIMPLE(1)									    PMDASIMPLE(1)

NAME
       pmdasimple - simple performance metrics domain agent (PMDA)

SYNOPSIS
       $PCP_PMDAS_DIR/simple/pmdasimple  [-d  domain] [-i port] [-l logfile] [-p] [-u socket] [-U
       username]

DESCRIPTION
       pmdasimple is a simple Performance Metrics Domain Agent (PMDA) which exports a small  num-
       ber of synthetic performance metrics.

       The  simple  PMDA is shipped as source code and is designed to be an aid for PMDA develop-
       ers.  In terms of code size and features, it is more complex than the trivial PMDA,  about
       the same as the txmon PMDA and less complex than the sample PMDA.  The source for the sim-
       ple PMDA is a good template from which production, customized PMDAs can be developed.

       A brief description of the pmdasimple command line options follows:

       -d   It is absolutely crucial that the performance metrics domain number specified here is
	    unique and consistent.  That is, domain should be different for every PMDA on the one
	    host, and the same domain number should be used for the same PMDA on all hosts.

       -i   Expect PMCD to connect to pmdasimple on the specified TCP/IP port.	 port  may  be	a
	    port number or port name.

       -l   Location  of the log file.	By default, a log file named simple.log is written in the
	    current directory of pmcd(1) when pmdasimple is started, i.e.  $PCP_LOG_DIR/pmcd.  If
	    the  log file cannot be created or is not writable, output is written to the standard
	    error instead.

       -p   Expect PMCD to create a pipe and the connection to pmdasimple is via  standard  input
	    and standard output.  This is the default connection mode.

       -u   Expect PMCD to connect to pmdasimple on the Unix domain socket named socket.

       -U   User  account  under  which  to run the agent.  The default is the unprivileged "pcp"
	    account in current versions of PCP, but  in  older	versions  the  superuser  account
	    ("root") was used by default.

       At most one of the options -i, -p and -u may be specified.

INSTALLATION
       If  you want access the names, help text and values for the simple performance metrics, do
       the following as root:

	    # cd $PCP_PMDAS_DIR/simple
	    # ./Install

       If you want to undo the installation, do the following as root:

	    # cd $PCP_PMDAS_DIR/simple
	    # ./Remove

       pmdasimple 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_PMCDCONF_PATH
		 command line options used to launch pmdasimple
       $PCP_PMDAS_DIR/simple/help
		 default help text file for the simple metrics
       $PCP_PMDAS_DIR/simple/Install
		 installation script for the pmdasimple agent
       $PCP_PMDAS_DIR/simple/Remove
		 undo installation script for the pmdasimple agent
       $PCP_PMDAS_DIR/simple/simple.conf
		 configuration file for the dynamic instance domain that underlies the simple.now
		 performance metric.  For a description, refer to the help text file, or run  the
		 command
		 $ pminfo -T simple.now
       $PCP_PMDAS_DIR/simple/*.pmda_simple.so
		 The DSO version of the PMDA.  The same source is used to create both the DSO and
		 the daemon versions of the simple PMDA, and one or the other may be installed as
		 part of the dialog in the Install script.
       $PCP_LOG_DIR/pmcd/simple.log
		 default log file for error messages and other information from pmdasimple

PCP ENVIRONMENT
       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 config-
       uration file, as described in pcp.conf(5).

SEE ALSO
       PCPIntro(1), pmcd(1), pmdasample(1), pmdatrivial(1),  pmdatxmon(1),  PMDA(3),  pcp.conf(5)
       and pcp.env(5).

Performance Co-Pilot			       PCP				    PMDASIMPLE(1)
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