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 a control group path is specified,
shows only the services of the specified control group.
If systemd-cgtop is not connected to a tty, no column headers are
printed and the default is to only run one iteration. The
--iterations= argument, if given, is honored. This mode is suitable
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". If resource monitoring for these
resources is required, it is recommended to add the CPUAccounting=1,
MemoryAccounting=1 and BlockIOAccounting=1 settings in the unit files
in question. See systemd.resource-control(5) for details.
The CPU load value can be between 0 and 100 times the number of
processors the system has. For example, if the system has 8
processors, the CPU load value is going to be between 0% and 800%.
The number of processors can be found in "/proc/cpuinfo".
To emphasize this: unless "CPUAccounting=1", "MemoryAccounting=1" and
"BlockIOAccounting=1" are enabled for the services in question, no
resource accounting will be available for system services and the
data shown by systemd-cgtop will be incomplete.
The following options are understood:
Order by control group path name.
Order by number of tasks/processes in the control group.
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 --iterations= is exhausted or until
killed. This mode could be useful for sending output from
systemd-cgtop to other programs or to a file.
Format byte counts (as in memory usage and I/O metrics) with raw
numeric values rather than human-readable numbers.
Controls whether the CPU usage is shown as percentage or time. By
default, the CPU usage is shown as percentage. This setting may
also be toggled at runtime by pressing the % key.
Count only userspace processes instead of all tasks. By default,
all tasks are counted: each kernel thread and each userspace
thread individually. With this setting, kernel threads are
excluded from the counting and each userspace process only counts
as one, regardless how many threads it consists of. This setting
may also be toggled at runtime by pressing the P key. This option
may not be combined with -k.
Count only userspace processes and kernel threads instead of all
tasks. By default, all tasks are counted: each kernel thread and
each userspace thread individually. With this setting, kernel
threads are included in the counting and each userspace process
only counts as on one, regardless how many threads it consists
of. This setting may also be toggled at runtime by pressing the k
key. This option may not be combined with -P.
Controls whether the number of processes shown for a control
group shall include all processes that are contained in any of
the child control groups as well. Takes a boolean argument, which
defaults to "yes". If enabled, the processes in child control
groups are included, if disabled, only the processes in the
control group itself are counted. This setting may also be
toggled at runtime by pressing the r key. Note that this setting
only applies to process counting, i.e. when the -P or -k options
are used. It has not effect if all tasks are counted, in which
case the counting is always recursive.
Perform only this many iterations. A value of 0 indicates that
the program should run indefinitely.
Specify refresh delay in seconds (or if one of "ms", "us", "min"
is specified as unit in this time unit). This setting may also be
increased and decreased at runtime by pressing the + and - keys.
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
-M MACHINE, --machine=MACHINE
Limit control groups shown to the part corresponding to the
container MACHINE. This option may not be used when a control
group path is specified.
Print a short help text and exit.
Print a short version string and exit.
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.
p, t, c, m, i
Sort the control groups by path, number of tasks, CPU load,
memory usage, or I/O load, respectively. This setting may also be
controlled using the --order= command line switch.
Toggle between showing CPU time as time or percentage. This
setting may also be controlled using the --cpu= command line
Increase or decrease refresh delay, respectively. This setting
may also be controlled using the --delay= command line switch.
Toggle between counting all tasks, or only userspace processes.
This setting may also be controlled using the -P command line
switch (see above).
Toggle between counting all tasks, or only userspace processes
and kernel threads. This setting may also be controlled using the
-k command line switch (see above).
Toggle between recursively including or excluding processes in
child control groups in control group process counts. This
setting may also be controlled using the --recursive= command
line switch. This key is not available if all tasks are counted,
it is only available if processes are counted, as enabled with
the P or k keys.
This page is part of the systemd (systemd system and service manager)
project. Information about the project can be found at
⟨http://www.freedesktop.org/wiki/Software/systemd⟩. If you have a bug
report for this manual page, see
page was obtained from the project's upstream Git repository
⟨https://github.com/systemd/systemd.git⟩ on 2016-10-04. If you dis‐
cover 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
systemd 231 SYSTEMD-CGTOP(1)