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 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.

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.

       -r, --raw
           Format byte counts (as in memory usage and I/O metrics) with raw numeric values rather than
           human-readable numbers.

       --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.

       -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 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.

       -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.

       --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 not effect if all tasks are counted, in which case the counting is always
           recursive.

       -n, --iterations=
           Perform only this many iterations. A value of 0 indicates that the program should run indefinitely.

       -1
           A shortcut for --iterations=1.

       -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.

       -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 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.

       +, -
           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).

       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).

       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.

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)