systemd-cgtop — Show top control groups by their resource usage
systemd-cgtop [OPTIONS...]
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.
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.
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.
Change ordering of control groups by path, number of tasks, CPU load, memory usage resp. IO load.
Increase, resp. decrease refresh delay.