systemd-cgtop

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) 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 245                                                   SYSTEMD-CGTOP(1)