systemd-cgtop — Show top control groups by their resource usage
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
by default places all services in their own control
group in the
cpuacct hierarchy, but
blkio. If resource monitoring for
these resources is required it is recommended to add
for details). Alternatively, it is possible to enable
resource accounting individually for services, by
making use of the
option in the unit files (See
To emphasize this: unless
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
The following options are understood:
Prints a short help text and exits.
Prints a version string and exits.
Order by control group path name.
Order by number of tasks in control group (i.e. threads and processes).
Order by CPU load.
Order by memory usage.
Order by disk I/O load.
Run in "batch" mode:
do not accept input and run until the
iteration limit set with
exhausted or until killed. This mode
could be useful for sending output
to other programs or to a
Perform only this many iterations.
Specify refresh delay
in seconds (or if one of
min is specified as
unit in this time
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.
systemd-cgtop is an interactive tool and may be controlled via user input using the following keys:
Shows a short help text.
Immediately refresh output.
Terminate the program.
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.
On success 0 is returned, a non-zero failure code otherwise.