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SYSTEMD-ANALYZE(1) | systemd-analyze | SYSTEMD-ANALYZE(1) |
NAME¶
systemd-analyze - Analyze system boot-up performanceSYNOPSIS¶
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, --helpPrints 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
systemd-analyze dot --to-pattern='*.target' --from-patter='*.target' | dot -Tsvg > targets.svg $ eog targets.svg
SEE ALSO¶
systemd 204 |