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.
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
If you want to undo the installation, do the following as root:
# cd $PCP_PMDAS_DIR/systemd
pmdasystemd is launched by pmcd(1) and should never be executed
directly. The Install and Remove scripts notify pmcd(1) when the
agent is installed or removed.
command line options used to launch pmdasystemd$PCP_PMDAS_DIR/systemd/help
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
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).
This page is part of the PCP (Performance Co-Pilot) project.
Information about the project can be found at ⟨http://www.pcp.io/⟩.
If you have a bug report for this manual page, send it to
email@example.com. This page was obtained from the project's upstream
Git repository ⟨https://github.com/performancecopilot/pcp.git⟩ 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 PMDASYSTEMD(1)