pmdasample(1) — Linux manual page


PMDASAMPLE(1)            General Commands Manual           PMDASAMPLE(1)

NAME         top

       pmdasample - sample performance metrics domain agent (PMDA)

SYNOPSIS         top

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

DESCRIPTION         top

       pmdasample is a sample Performance Metrics Domain Agent (PMDA)
       which exports a variety of synthetic performance metrics.

       This PMDA was developed as part of the quality assurance testing
       for the PCP product, but has other uses, most notably in the
       development of new PCP clients.

       The metrics exported by the sample PMDA cover the full range of
       data types, data semantics, value cardinality, instance domain
       stability and error conditions found in real PMDAs.

       A brief description of the pmdasample 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 pmdasample 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
            sample.log is written in the current directory of pmcd(1)
            when pmdasample 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
            pmdasample is via standard input and standard output.  This
            is the default connection mode.

       -u   Expect PMCD to connect to pmdasample 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 to the names, help text and values for the
       sample performance metrics, do the following as root:

            # cd $PCP_PMDAS_DIR/sample
            # ./Install

       Note that the installation script also installs the DSO version
       of the sample PMDA, so there are in fact two PMDAs installed, and
       two sets of performance metrics, namely sample.*  and

       If you want to undo the installation (and remove both PMDAs), do
       the following as root:

            # cd $PCP_PMDAS_DIR/sample
            # ./Remove

       pmdasample 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 pmdasample
              default help text file for the sample metrics
              installation script for the pmdasample agent
              undo installation script for the pmdasample agent
              default log file for error messages and other information
              from pmdasample


       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), pmdasimple(1), pmdatrivial(1),
       pmdatxmon(1), 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                     PMDASAMPLE(1)

Pages that refer to this page: pmdasimple(1)pmdatrivial(1)pmdatxmon(1)pmlookuplabels(3)