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Parallel parsing - fsc.exe #11140

Merged
merged 13 commits into from
Mar 3, 2021
Merged

Parallel parsing - fsc.exe #11140

merged 13 commits into from
Mar 3, 2021

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TIHan
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@TIHan TIHan commented Feb 23, 2021

Enables parallel parsing by default when compiling via fsc.exe. Is a continuation of #10208 and is ready.

This adds a new test compiler option:

  • -test:ParallelOff - turns off concurrent build

Early results

CPU: Core i7-10700K @ 3.8GHz (8 cores, 16 logical cores)
Using command line msbuild FSharp.Compiler.Service.fsproj with only compiling netstandard2.0 target - this is also without generating the parser

  • Parallel Off: Time Elapsed 00:00:38.65
  • Parallel On: Time Elapsed 00:00:34.90

That's a ~9% decrease in compile time when re-building the compiler service.

src/fsharp/fsc.fs Outdated Show resolved Hide resolved
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Looks great subject to tests passing!

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Looks great subject to tests passing!

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TIHan commented Feb 26, 2021

Almost passing, one test is failing as the order of errors have changed. Will need to investigate.

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TIHan commented Feb 26, 2021

It passes!

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TIHan commented Feb 26, 2021

@dsyme, this look ok to you?

@cartermp cartermp merged commit d18da33 into dotnet:main Mar 3, 2021
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4 participants