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)