SYSTEMD-CGTOP
Section: systemd-cgtop (1)
Updated:
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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". 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.
OPTIONS
The following options are understood:
-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.
-h, --help
-
Print a short help text and exit.
--version
-
Print a short version string and exit.
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),
systemd.resource-control(5),
top(1)
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- OPTIONS
-
- KEYS
-
- EXIT STATUS
-
- SEE ALSO
-