pmdasystemd(1) — Linux manual page


PMDASYSTEMD(1)           General Commands Manual          PMDASYSTEMD(1)

NAME         top

       pmdasystemd - systemd performance metrics domain agent (PMDA)

SYNOPSIS         top

       $PCP_PMDAS_DIR/systemd/pmdasystemd [-f] [-d domain] [-l logfile]
       [-m memory] [-s interval] [-U username]

DESCRIPTION         top

       pmdasystemd is a systemd log file monitoring Performance Metrics
       Domain Agent (PMDA).  It can be seen as analagous to the -f
       option to journalctl(1) and converts each new log line into a
       performance event, suitable for consumption by PMAPI(3) client
       tools like pmevent(1).

       The systemd PMDA exports both event-style metrics reflecting
       timestamped event records for messages logged to the system logs,
       as well as the more orthodox sample-style metrics such as message
       counts and throughput size values.

       A brief description of the pmdasystemd 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.

       -f   Disables per-uid/gid record filtering.  By default the user
            and group credentials will be used to filter log records
            returned to the client tool, preventing information exposure
            to arbitrary users.  This option disables that, so use only
            with extreme caution.

       -l   Location of the log file.  By default, a log file named
            systemd.log is written in the current directory of pmcd(1)
            when pmdasystemd 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.

       -m   Limit the physical memory used by the PMDA to buffer event
            records to maxsize bytes.  As log events arrive at the PMDA,
            they must be buffered until individual client tools request
            the next batch since their previous batch of events.  The
            default maximum is 2 megabytes.

       -s   Sets the polling interval for detecting newly arrived log
            lines.  Mirrors the same option from the tail(1) command.

       -U   User account under which to run the agent.  The default is
            the "adm" user account.

INSTALLATION         top

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

            # cd $PCP_PMDAS_DIR/systemd
            # ./Install

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

            # cd $PCP_PMDAS_DIR/systemd
            # ./Remove

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


       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), pmevent(1), journalctl(1), tail(1),
       PMAPI(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                    PMDASYSTEMD(1)