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A few super-minor compiler perf improvements #17130

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merged 8 commits into from
May 13, 2024

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brianrourkeboll
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@brianrourkeboll brianrourkeboll commented May 9, 2024

Description

I saw some of these show up when I did a quick profile of FSharp.Compiler.ComponentTests, which take the longest to run of all the tests.

  • Override ToString on BuildPhase; the automatic printf-based implementation does a lot more work than it needs to for a fieldless DU.

    Example DiagnosticsLogger_BuildPhase_ToString_Screenshot 2024-05-09 110559_2

    let ParseInput
    (
    lexer,
    diagnosticOptions: FSharpDiagnosticOptions,
    diagnosticsLogger: DiagnosticsLogger,
    lexbuf: UnicodeLexing.Lexbuf,
    defaultNamespace,
    fileName,
    isLastCompiland,
    identCapture,
    userOpName
    ) =
    use _ =
    Activity.start
    "ParseAndCheckFile.parseFile"
    [|
    Activity.Tags.fileName, fileName
    Activity.Tags.buildPhase, BuildPhase.Parse.ToString()

    I guess I could have just changed the above to this instead:

    -Activity.Tags.buildPhase, BuildPhase.Parse.ToString()
    +Activity.Tags.buildPhase, nameof BuildPhase.Parse

    But maybe it's best to speed up any potential future stringifications anyway, just in case.

  • Cache the delegate passed into ConcurrentDictionary.GetOrAdd where possible. See Cache delegates #14582, Emit direct delegates when possible fsharp/fslang-suggestions#1083, etc.

  • Remove a redundant StringBuilder in one place.

Checklist

  • Release notes entry updated.

* Override `ToString` on `BuildPhase`.

* Cache the delegate passed into `ConcurrentDictionary.GetOrAdd` where
  possible. See dotnet#14582, fsharp/fslang-suggestions#1083, etc.
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github-actions bot commented May 9, 2024

❗ Release notes required


✅ Found changes and release notes in following paths:

Change path Release notes path Description
src/FSharp.Core docs/release-notes/.FSharp.Core/8.0.400.md
src/Compiler docs/release-notes/.FSharp.Compiler.Service/8.0.400.md

@brianrourkeboll brianrourkeboll marked this pull request as ready for review May 9, 2024 23:48
@brianrourkeboll brianrourkeboll requested a review from a team as a code owner May 9, 2024 23:48
* I don't think I fully understand why, but I did some rough
  microbenchmarking, and for some reason the `GetOrAdd` and
  `Interlocked.Increment` on a ref cell technique is actually something
  like twice as fast as `AddOrUpdate`.
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@psfinaki psfinaki left a comment

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Thanks!

@psfinaki psfinaki enabled auto-merge (squash) May 13, 2024 11:05
@psfinaki psfinaki merged commit 75c3558 into dotnet:main May 13, 2024
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@brianrourkeboll brianrourkeboll deleted the minor-perf-improvements branch May 13, 2024 13:16
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4 participants