pmdasimple(1) — Linux manual page


PMDASIMPLE(1)            General Commands Manual           PMDASIMPLE(1)

NAME         top

       pmdasimple - simple performance metrics domain agent (PMDA)

SYNOPSIS         top

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

DESCRIPTION         top

       pmdasimple is a simple Performance Metrics Domain Agent (PMDA)
       which exports a small number of synthetic performance metrics.

       The simple PMDA is shipped as source code and is designed to be
       an aid for PMDA developers.  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 simple PMDA is a good template from which production,
       customized PMDAs can be developed.

       A brief description of the pmdasimple command line options

       -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         top

       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         top

              command line options used to launch pmdasimple
              default help text file for the simple metrics
              installation script for the pmdasimple agent
              undo installation script for the pmdasimple agent
              configuration file for the dynamic instance domain that
              underlies the performance metric.  For a
              description, refer to the help text file, or run the
              $ pminfo -T
              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.
              default log file for error messages and other information
              from pmdasimple


       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 configuration file, as described in

SEE ALSO         top

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

COLOPHON         top

       This page is part of the PCP (Performance Co-Pilot) project.
       Information about the project can be found at 
       ⟨⟩.  If you have a bug report for this manual
       page, send it to  This page was obtained from the
       project's upstream Git repository
       ⟨⟩ on 2023-12-22.
       (At that time, the date of the most recent commit that was found
       in the repository was 2023-12-16.)  If you discover any rendering
       problems in this HTML version of the page, or you believe there
       is a better or more up-to-date source for the page, or you have
       corrections or improvements to the information in this COLOPHON
       (which is not part of the original manual page), send a mail to

Performance Co-Pilot               PCP                     PMDASIMPLE(1)

Pages that refer to this page: pmdasample(1)pmdatrivial(1)