2dcd42f395
Reusing the best profiling UI out there Usage: ``` lean -Dtrace.profiler=true -Dtrace.profiler.output=profile.json foo.lean ... ``` then open `profile.json` in https://profiler.firefox.com/. See also `script/collideProfiles.lean` for minimizing and merging profiles.
28 lines
983 B
Text
28 lines
983 B
Text
import Lean.Util.Profiler
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/-!
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Usage:
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```sh
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lean --run ./script/collideProfiles.lean **/*.lean.json ... > merged.json
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```
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Merges multiple `trace.profiler.output` profiles into a single one while deduplicating samples with
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the same stack. This is useful for building cumulative profiles of medium-to-large projects because
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Firefox Profiler cannot handle hundreds of tracks and the deduplication will also ensure that the
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profile is small enough for uploading.
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As ordering of samples is not meaningful after this transformation, only "Call Tree" and "Flame
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Graph" are useful for such profiles.
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-/
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open Lean
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def main (args : List String) : IO Unit := do
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let profiles ← args.toArray.mapM fun path => do
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let json ← IO.FS.readFile ⟨path⟩
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let profile ← IO.ofExcept $ Json.parse json
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IO.ofExcept <| fromJson? profile
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-- NOTE: `collide` should not be interpreted
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let profile := Firefox.Profile.collide profiles
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IO.println <| Json.compress <| toJson profile
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