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

       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 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.

       -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

       -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 pcp.conf(5).

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
       2020-11-01.  (At that time, the date of the most recent commit that
       was found in the repository was 2020-10-30.)  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)