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----
-breadcrumbs:
-- - /developers
- - For Developers
-- - /developers/telemetry
- - 'Telemetry: Introduction'
-page_name: telemetry-profile-generation
-title: 'Telemetry: Profile Generation'
----
-
-By default, Telemetry runs all benchmarks in a fresh, clean profile. This isn't
-always desirable for benchmarking. To run with other types of profiles, use
-either --profile-type or --profile-dir.
-
-**--profile-type=**
-
-* clean (default behavior) -- a clean, new profile. Note that
- benchmarks may include initialization routines that only happen on
- the first run.
-* default -- the default profile associated with the browser. As far
- as Telemetry is concerned, this is a non-deterministic state.
-* typical_user -- a pre-recorded profile that represents a typical
- user's profile. Note that benchmarks may include profile upgrade
- routines.
-* power_user -- a pre-recorded profile that represents a power user's
- profile. Note that benchmarks may include profile upgrade routines.
-
-**--profile-dir=**
-
-> A path to a profile to use. This is useful with generated profiles.
-
-### Generated profiles
-
-Because the canned profile-types may exhibit unrealistic behavior in benchmarks
-(due to profile initialization or update routines), it is useful to be able to
-generate a deterministic profile for benchmarking. To do so:
-
-> $ tools/perf/generate_profile --profile-type-to-generate=<PROFILE_TYPE>
-> --output-dir=/path/to/output/profile
-
-**<PROFILE_TYPE>** may be small_profile, theme_profile or
-many_extensions_profile.
-
-Generated profile output directories should then be passed to --profile-dir. For
-example, to run the session_restore benchmark:
-
-> $ tools/perf/generate_profile --profile-type-to-generate=small_profile
-> --output-dir=out/Release/generated_profile
-
-> $ tools/perf/run_benchmark
-> --profile-dir=out/Release/generated_profile/small_profile
-> session_restore.cold.typical_25
-
-Profile generation is in the process of being updated to generate more realistic
-profiles. This is still a work in progress. To try it out, run:
-
-$ tools/perf/generate_profile --profile-type-to-generate=large_profile
---browser=exact --browser-executable={path_to_executable} --use-live-sites
---output-dir=/path/to/output/profile \ No newline at end of file