|
HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
|
|
NAME | SYNOPSIS | DESCRIPTION | INSTALLATION | FILES | PCP ENVIRONMENT | DEBUGGING OPTIONS | SEE ALSO | COLOPHON |
|
|
|
PMDAXFS(1) General Commands Manual PMDAXFS(1)
pmdaxfs - XFS filesystem performance metrics domain agent (PMDA)
$PCP_PMDAS_DIR/xfs/pmdaxfs [-D debug] [-d domain] [-l logfile]
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.
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.
$PCP_PMCDCONF_PATH
command line options used to launch pmdaxfs
$PCP_PMDAS_DIR/xfs/help
default help text file for the xfs metrics
$PCP_PMDAS_DIR/xfs/Install
installation script for the pmdaxfs agent
$PCP_PMDAS_DIR/xfs/Remove
undo installation script for the pmdaxfs agent
$PCP_LOG_DIR/pmcd/xfs.log
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 pcp.conf(5).
The -D or --debug option enables the output of additional
diagnostics on stderr to help triage problems, although the
information is sometimes cryptic and primarily intended to provide
guidance for developers rather end-users. debug is a comma
separated list of debugging options; use pmdbg(1) with the -l
option to obtain a list of the available debugging options and
their meaning.
PCPIntro(1), pmcd(1), pmstore(1), pcp.conf(5) and pcp.env(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 pcp@groups.io. This page was obtained from the
project's upstream Git repository
⟨https://github.com/performancecopilot/pcp.git⟩ on 2025-08-11.
(At that time, the date of the most recent commit that was found
in the repository was 2025-08-11.) 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
man-pages@man7.org
Performance Co-Pilot PCP PMDAXFS(1)
|
HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
|