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SYSTEMD-CGTOP(1)		 systemd-cgtop		      SYSTEMD-CGTOP(1)

NAME
       systemd-cgtop - Show top control groups by their resource usage

SYNOPSIS
       systemd-cgtop [OPTIONS...]

DESCRIPTION
       systemd-cgtop shows the top control groups of the local Linux control
       group hierarchy, ordered by their CPU, memory and disk I/O load. The
       display is refreshed in regular intervals (by default every 1s),
       similar in style to top(1).

       Resource usage is only accounted for control groups in the relevant
       hierarchy, i.e. CPU usage is only accounted for control groups in the
       cpuacct hierarchy, memory usage only for those in memory and disk I/O
       usage for those in blkio.  systemd(1) by default places all services in
       their own control group in the cpuacct hierarchy, but not in memory nor
       blkio. If resource monitoring for these resources is required it is
       recommended to add blkio and memory to the DefaultControllers= setting
       in /etc/systemd/system.conf (see systemd.conf(5) for details).
       Alternatively, it is possible to enable resource accounting
       individually for services, by making use of the ControlGroup= option in
       the unit files (See systemd.exec(5) for details).

       To emphasize this: unless blkio and memory are enabled for the services
       in question with either of the options suggested above no resource
       accounting will be available for system services and the data shown by
       systemd-cgtop will be incomplete.

OPTIONS
       The following options are understood:

       -h, --help
	   Prints a short help text and exits.

       -p
	   Order by control group path name.

       -t
	   Order by number of tasks in control group (i.e. threads and
	   processes).

       -c
	   Order by CPU load.

       -m
	   Order by memory usage.

       -i
	   Order by disk I/O load.

       -d, --delay=
	   Specify refresh delay in seconds (or if one of ms, us, min is
	   specified as unit in this time unit).

       --depth=
	   Maximum control group tree traversal depth. Specifies how deep
	   systemd-cgtop shall traverse the control group hierarchies. If 0 is
	   specified only the root group is monitored, for 1 only the first
	   level of control groups is monitored, and so on. Defaults to 3.

KEYS
       systemd-cgtop is an interactive tool and may be controlled via user
       input using the following keys:

       h
	   Shows a short help text.

       SPACE
	   Immediately refresh output.

       q
	   Terminate the program.

       p, t, c, m, i
	   Change ordering of control groups by path, number of tasks, CPU
	   load, memory usage resp. IO load.

       +, -
	   Increase, resp. decrease refresh delay.

EXIT STATUS
       On success 0 is returned, a non-zero failure code otherwise.

SEE ALSO
       systemd(1), systemctl(1), systemd-cgls(1), top(1)

AUTHOR
       Lennart Poettering <lennart@poettering.net>
	   Developer

systemd				  02/15/2013		      SYSTEMD-CGTOP(1)

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