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
-u Expect PMCD to connect to pmdasample on the Unix domain 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.
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
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 $PCP_PMDAS_DIR/sample
pmdasample is launched by pmcd(1) and should never be executed
directly. The Install and Remove scripts notify pmcd(1) when the
agent is installed or removed.
command line options used to launch pmdasample$PCP_PMDAS_DIR/sample/help
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
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 ⟨git://git.pcp.io/pcp⟩ on 2017-03-13. 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
Performance Co-Pilot PCP PMDASAMPLE(1)