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.TH "SYSTEMD\-CGTOP" "1" "" "systemd 204" "systemd-cgtop"
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.SH "NAME"
systemd-cgtop \- Show top control groups by their resource usage
.SH "SYNOPSIS"
.HP \w'\fBsystemd\-cgtop\fR\ 'u
\fBsystemd\-cgtop\fR [OPTIONS...]
.SH "DESCRIPTION"
.PP
\fBsystemd\-cgtop\fR
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
\fBtop\fR(1)\&. If
\fBsystemd\-cgtop\fR
is not connected to a tty, only one iteration is performed and no columns headers are printed\&. This mode is suitable for scripting\&.
.PP
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\&.
\fBsystemd\fR(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
\fIDefaultControllers=\fR
setting in
/etc/systemd/system\&.conf
(see
\fBsystemd-system.conf\fR(5)
for details)\&. Alternatively, it is possible to enable resource accounting individually for services, by making use of the
\fIControlGroup=\fR
option in the unit files (See
\fBsystemd.exec\fR(5)
for details)\&.
.PP
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
\fBsystemd\-cgtop\fR
will be incomplete\&.
.SH "OPTIONS"
.PP
The following options are understood:
.PP
\fB\-h\fR, \fB\-\-help\fR
.RS 4
Prints a short help text and exits\&.
.RE
.PP
\fB\-\-version\fR
.RS 4
Prints a version string and exits\&.
.RE
.PP
\fB\-p\fR
.RS 4
Order by control group path name\&.
.RE
.PP
\fB\-t\fR
.RS 4
Order by number of tasks in control group (i\&.e\&. threads and processes)\&.
.RE
.PP
\fB\-c\fR
.RS 4
Order by CPU load\&.
.RE
.PP
\fB\-m\fR
.RS 4
Order by memory usage\&.
.RE
.PP
\fB\-i\fR
.RS 4
Order by disk I/O load\&.
.RE
.PP
\fB\-b\fR, \fB\-\-batch\fR
.RS 4
Run in "batch" mode: do not accept input and run until the iteration limit set with
\fB\-\-iterations\fR
is exhausted or until killed\&. This mode could be useful for sending output from
\fBsystemd\-cgtop\fR
to other programs or to a file\&.
.RE
.PP
\fB\-n\fR, \fB\-\-iterations=\fR
.RS 4
Perform only this many iterations\&.
.RE
.PP
\fB\-d\fR, \fB\-\-delay=\fR
.RS 4
Specify refresh delay in seconds (or if one of
ms,
us,
min
is specified as unit in this time unit)\&.
.RE
.PP
\fB\-\-depth=\fR
.RS 4
Maximum control group tree traversal depth\&. Specifies how deep
\fBsystemd\-cgtop\fR
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\&.
.RE
.SH "KEYS"
.PP
\fBsystemd\-cgtop\fR
is an interactive tool and may be controlled via user input using the following keys:
.PP
h
.RS 4
Shows a short help text\&.
.RE
.PP
SPACE
.RS 4
Immediately refresh output\&.
.RE
.PP
q
.RS 4
Terminate the program\&.
.RE
.PP
p, t, c, m, i
.RS 4
Sort the control groups by path, number of tasks, CPU load, memory usage, or IO load, respectively\&.
.RE
.PP
%
.RS 4
Toggle between showing CPU time as time or percentage\&.
.RE
.PP
+, \-
.RS 4
Increase or decrease refresh delay, respectively\&.
.RE
.SH "EXIT STATUS"
.PP
On success 0 is returned, a non\-zero failure code otherwise\&.
.SH "SEE ALSO"
.PP

\fBsystemd\fR(1),
\fBsystemctl\fR(1),
\fBsystemd-cgls\fR(1),
\fBtop\fR(1)