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HTML rendering created 2026-05-24 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. |
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NAME | SYNOPSIS | DESCRIPTION | TCP STATISTICS CONFIGURATION | INSTALLATION | FILES | PCP ENVIRONMENT | SEE ALSO | COLOPHON |
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PMDADARWIN(1) General Commands Manual PMDADARWIN(1)
pmdadarwin - Darwin (macOS) kernel PMDA
$PCP_PMDAS_DIR/darwin/pmdadarwin [-d domain] [-l logfile] [-U
username]
pmdadarwin is a Performance Metrics Domain Agent (PMDA) which
extracts performance metrics from the macOS (Darwin) kernel.
The darwin PMDA exports metrics that examine memory utilization,
virtual memory statistics, network interface statistics, disk I/O
statistics, TCP connection states, and various protocol statistics
including TCP, UDP, and ICMP.
On macOS, access to detailed TCP protocol statistics is controlled
by the kernel sysctl parameter
net.inet.tcp.disable_access_to_stats. By default, this is set to
1 (disabled) for privacy and security.
When disabled, all network.tcp.* metrics (except connection state
counts from network.tcpconn.*) will report zero values. The PMDA
will log a warning message on startup if TCP statistics access is
detected to be disabled.
Manual Configuration
To enable TCP statistics manually, run as root:
$ sudo sysctl -w net.inet.tcp.disable_access_to_stats=0
To make this permanent across reboots, add to /etc/sysctl.conf:
net.inet.tcp.disable_access_to_stats=0
Note: This setting is not protected by System Integrity Protection
(SIP) and can be modified as root.
The darwin PMDA is installed and available by default on macOS
systems. If you want to undo the installation, do the following
as root:
# cd $PCP_PMDAS_DIR/darwin
# ./Remove
If you want to enable the PMDA again, do the following as root:
# cd $PCP_PMDAS_DIR/darwin
# ./Install
pmdadarwin 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_PMDAS_DIR/darwin/help
default help text file for the darwin metrics
$PCP_PMDAS_DIR/darwin/Install
installation script for the darwin PMDA
$PCP_PMDAS_DIR/darwin/Remove
undo installation script for the darwin PMDA
$PCP_LOG_DIR/pmcd/darwin.log
default log file for error and diagnostic messages from the
darwin PMDA
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).
PCPIntro(1), pmcd(1), pminfo(1) and sysctl(8).
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 2026-05-24.
(At that time, the date of the most recent commit that was found
in the repository was 2026-05-24.) 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 PMDADARWIN(1)
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HTML rendering created 2026-05-24 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. |
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