pmdaxfs(1) — Linux manual page


PMDAXFS(1)               General Commands Manual              PMDAXFS(1)

NAME         top

       pmdaxfs - XFS filesystem performance metrics domain agent (PMDA)

SYNOPSIS         top

       $PCP_PMDAS_DIR/xfs/pmdaxfs [-d domain] [-l logfile]

DESCRIPTION         top

       pmdaxfs is a Performance Metrics Domain Agent (PMDA) which
       extracts performance metrics describing the state of the XFS
       filesystem from the Linux kernel.

       The xfs PMDA exports metrics that measure information about
       metadata buffer usage, the journal, btree operations, inode
       operations, extended attributes, directories, quotas, read and
       write operation counts and of course throughput.

       The PMDA provides a facility to reset the values of all counters
       to zero using pmstore(1) with the xfs.control.reset metric.

       A brief description of the pmdaxfs 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.

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

INSTALLATION         top

       The xfs PMDA is installed and available by default on Linux.  If
       you want to undo the installation, do the following as root:

            # cd $PCP_PMDAS_DIR/xfs
            # ./Remove

       If you want to establish access to the names, help text and
       values for the XFS performance metrics once more, after removal,
       do the following as root:

            # cd $PCP_PMDAS_DIR/xfs
            # ./Install

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


       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), pmstore(1), 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 
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       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
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Performance Co-Pilot               PCP                        PMDAXFS(1)