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 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 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

       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 sampledso.*.

       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 pcp.conf(5).

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
       2020-08-13.  (At that time, the date of the most recent commit that
       was found in the repository was 2020-08-11.)  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: genload(1)pmdasimple(1)pmdatrivial(1)pmdatxmon(1)txrecord(1)pmGetClusterLabels(3)pmGetContextLabels(3)pmGetDomainLabels(3)pmGetInDomLabels(3)pmGetInstancesLabels(3)pmGetItemLabels(3)pmlookuplabels(3)pmLookupLabels(3)