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, or disk I/O load. The display is refreshed in regular
       intervals (by default every 1s), similar in style to top(1). If systemd-cgtop is not
       connected to a tty, only one iteration is performed and no columns headers are printed.
       This mode is suitable for scripting.

       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-
       system.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.

       --version
           Prints a version string 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.

       -b, --batch
           Run in "batch" mode: do not accept input and run until the iteration limit set with
           --iterations is exhausted or until killed. This mode could be useful for sending
           output from systemd-cgtop to other programs or to a file.

       -n, --iterations=
           Perform only this many iterations.

       -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
           Sort the control groups by path, number of tasks, CPU load, memory usage, or IO load,
           respectively.

       %
           Toggle between showing CPU time as time or percentage.

       +, -
           Increase or decrease refresh delay, respectively.

EXIT STATUS

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

SEE ALSO

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