SYSTEMD-CGTOP(1) systemd-cgtop SYSTEMD-CGTOP(1)
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 "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).
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:
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
--iterations is exhausted or until killed. This mode could be useful for sending
output from systemd-cgtop to other programs or to a file.
Perform only this many iterations.
Specify refresh delay in seconds (or if one of "ms", "us", "min" is specified as unit
in this time unit).
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
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 IO load,
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.
systemd(1), systemctl(1), systemd-cgls(1), systemd.resource-control(5), top(1)
systemd 208 SYSTEMD-CGTOP(1)