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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 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) and CPU time 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)



systemd 249                                                                         SYSTEMD-CGTOP(1)