pmdatxmon(1) — Linux manual page


PMDATXMON(1)             General Commands Manual            PMDATXMON(1)

NAME         top

       pmdatxmon, txrecord, genload - txmon performance metrics domain
       agent (PMDA)

SYNOPSIS         top

       $PCP_PMDAS_DIR/txmon/pmdatxmon [-d domain] [-l logfile] [-U
       username] tx_type ...
       $PCP_PMDAS_DIR/txmon/txrecord [-l]
       $PCP_PMDAS_DIR/txmon/txrecord tx_type servtime [tx_type servtime
       ... ]

DESCRIPTION         top

       pmdatxmon is an example Performance Metrics Domain Agent (PMDA)
       which exports a small number of performance metrics from a
       simulated transaction monitor.

       The txmon PMDA is shipped as both binary and source code and is
       designed to be an aid for PMDA developers; the txmon PMDA
       demonstrates how performance data can be exported from an
       application (in this case txrecord) to the PCP infrastructure via
       a shared memory segment.  As a matter of convenience, pmdatxmon
       creates (and destroys on exit) the shared memory segment.

       The tx_type arguments are arbitrary unique tags used to identify
       different transaction types.

       The txrecord application simulates the processing of one or more
       transactions identified by tx_type and with an observed service
       time of servtime .

       With the -l option, txrecord displays the current summary of the
       transaction activity from the shared memory segment.

       genload is a shell and awk(1) script that acts as a front-end to
       txrecord to generate a constant load of simulated transaction

       A brief description of the pmdatxmon 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.

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

       -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 default.

INSTALLATION         top

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

            # cd $PCP_PMDAS_DIR/txmon
            # ./Install

       You will be prompted for the tx_type tags.

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

            # cd $PCP_PMDAS_DIR/txmon
            # ./Remove

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


       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), pmdasample(1), pmdatrivial(1), txmonvis(1)
       and PMDA(3).

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 2023-06-23.
       (At that time, the date of the most recent commit that was found
       in the repository was 2023-06-21.)  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                      PMDATXMON(1)

Pages that refer to this page: pmdasample(1)pmdasimple(1)pmdatrivial(1)