NAME

       systemd-analyze - Analyze system boot-up performance

SYNOPSIS

       systemd-analyze [OPTIONS...] time

       systemd-analyze [OPTIONS...] blame

       systemd-analyze [OPTIONS...] critical-chain

       systemd-analyze [OPTIONS...] plot [> file.svg]

       systemd-analyze [OPTIONS...] dot [pattern...]

DESCRIPTION

       systemd-analyze may be used to determine system boot-up performance of the current boot.

       systemd-analyze time prints the time spent in the kernel before userspace has been reached, the time
       spent in the initial RAM disk (initrd) before normal system userspace has been reached and the time
       normal system userspace took to initialize. Note that these measurements simply measure the time passed
       up to the point where all system services have been spawned, but not necessarily until they fully
       finished initialization or the disk is idle.

       systemd-analyze blame prints a list of all running units, ordered by the time they took to initialize.
       This information may be used to optimize boot-up times. Note that the output might be misleading as the
       initialization of one service might be slow simply because it waits for the initialization of another
       service to complete.

       systemd-analyze critical-chain prints a tree of the time critical chain of units. The time after the unit
       is active or started is printed after the "@" character. The time the unit takes to start is printed
       after the "+" character. Note that the output might be misleading as the initialization of one service
       might depend on socket activation and because of the parallel execution of units.

       systemd-analyze plot prints an SVG graphic detailing which system services have been started at what
       time, highlighting the time they spent on initialization.

       systemd-analyze dot Generate textual dependency graph description in dot format for further processing
       with the GraphViz dot(1) tool. Use a command line like systemd-analyze dot | dot -Tsvg > systemd.svg to
       generate a graphical dependency tree. Unless --order or --require is passed the generated graph will show
       both ordering and requirement dependencies. Optional pattern globbing style specifications (e.g.
       *.target) may be given at the end. A unit dependency is included in the graph if any of these patterns
       match either the origin or destination node.

       If no command is passed systemd-analyze time is implied.

OPTIONS

       The following options are understood:

       -h, --help
           Prints a short help text and exits.

       --user
           Shows performance data of user sessions instead of the system manager.

       --order, --require
           When used in conjunction with the dot command (see above), selects which dependencies are shown in
           the dependency graph. If --order is passed only dependencies of type After= or Before= are shown. If
           --require is passed only dependencies of type Requires=, RequiresOverridable=, Requisite=,
           RequisiteOverridable=, Wants= and Conflicts= are shown. If neither is passed, shows dependencies of
           all these types.

       --from-pattern=, --to-pattern=
           When used in conjunction with the dot command (see above), selects which relationships are shown in
           the dependency graph. They both require glob(7) patterns as arguments, which are matched against
           lefthand and righthand, respectively, nodes of a relationship. Each of these can be used more than
           once which means a unit name must match one of given values.

       --fuzz=timespan
           When used in conjunction with the critical-chain command (see above), also show units, which finished
           timespan earlier, than the latest unit in the same level. The unit of timespan is seconds unless
           specified with a different unit, i.e. "50ms".

EXIT STATUS

       On success 0 is returned, a non-zero failure code otherwise.

EXAMPLES

       This plots all dependencies of any unit whose name starts with "avahi-daemon.":

           $ systemd-analyze dot 'avahi-daemon.*' | dot -Tsvg > avahi.svg
           $ eog avahi.svg

       This plots the dependencies between all known target units:

           systemd-analyze dot --to-pattern='*.target' --from-patter='*.target' | dot -Tsvg > targets.svg
           $ eog targets.svg

SEE ALSO

       systemd(1), systemctl(1)