SYSTEMD-CGTOP(1) systemd-cgtop SYSTEMD-CGTOP(1)
NAME
systemd-cgtop - Show top control groups by their resource usage
SYNOPSIS
systemd-cgtop [OPTIONS...] [GROUP]
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 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 for scripting.
Resource usage is only accounted for control groups with the appropriate
controllers turned on: "cpu" controller for CPU usage, "memory"
controller for memory usage, and "io" controller for disk I/O
consumption. If resource monitoring for these resources is required, it
is recommended to add the CPUAccounting=1, MemoryAccounting=1 and
IOAccounting=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: unless "CPUAccounting=1", "MemoryAccounting=1", and
"IOAccounting=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=path
Order by control group path name.
-t, --order=tasks
Order by number of tasks/processes in the control group.
-c, --order=cpu
Order by CPU load.
-m, --order=memory
Order by memory usage.
-i, --order=io
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.
Added in version 188.
-r, --raw
Format byte counts (as in memory usage and I/O metrics) and CPU time
with raw numeric values rather than human-readable numbers.
Added in version 221.
--cpu=percentage, --cpu=time
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.
Added in version 226.
-P
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 count and each userspace process only counts as one task,
regardless of 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.
Added in version 227.
-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 count and each userspace process only
counts as one task, regardless of 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.
Added in version 226.
--recursive=
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 no effect
if all tasks are counted, in which case the counting is always
recursive.
Added in version 226.
-n, --iterations=
Perform only this many iterations. A value of 0 indicates that the
program should run indefinitely.
Added in version 188.
-1
A shortcut for --iterations=1.
Added in version 238.
-d, --delay=
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.
--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.
-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.
Added in version 227.
-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.
Added in version 226.
q
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 switch.
Added in version 201.
+, -
Increase or decrease refresh delay, respectively. This setting may
also be controlled using the --delay= command line switch.
P
Toggle between counting all tasks, or only userspace processes. This
setting may also be controlled using the -P command line switch (see
above).
Added in version 227.
k
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).
Added in version 226.
r
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.
Added in version 226.
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)
systemd 257.9 SYSTEMD-CGTOP(1)
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