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Add more specialized frozen collection types. #79794

Merged
merged 2 commits into from
Jan 9, 2023
Merged

Add more specialized frozen collection types. #79794

merged 2 commits into from
Jan 9, 2023

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geeknoid
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  • Add SmallFrozenDictionary/Set which don't do any hashing and simply iterate through arrays, testing each element

  • Add ClosedRangeInt32FrozenDictionary/Set which are used when the keys are in a closed integer range.

  • Add SparseRangeInt32FrozenSet which uses a bit vector for storage.

FrozenDictionary/Set each have some constants defined to drive the heuristics that decide when to use the small and sparse collection types. I did some preliminary tuning of these, but this could use a detailed benchmark to pick the right values. I'll leave the fine-tuning to a separate PR.

@ghost ghost assigned geeknoid Dec 18, 2022
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ghost commented Dec 18, 2022

Tagging subscribers to this area: @dotnet/area-system-collections
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Issue Details

  • Add SmallFrozenDictionary/Set which don't do any hashing and simply iterate through arrays, testing each element

  • Add ClosedRangeInt32FrozenDictionary/Set which are used when the keys are in a closed integer range.

  • Add SparseRangeInt32FrozenSet which uses a bit vector for storage.

FrozenDictionary/Set each have some constants defined to drive the heuristics that decide when to use the small and sparse collection types. I did some preliminary tuning of these, but this could use a detailed benchmark to pick the right values. I'll leave the fine-tuning to a separate PR.

Author: geeknoid
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area-System.Collections
Milestone: -

gfoidl
gfoidl reviewed Dec 18, 2022
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...stem.Collections.Immutable/src/System/Collections/Frozen/ClosedRangeInt32FrozenDictionary.cs Outdated Show resolved Hide resolved
...stem.Collections.Immutable/src/System/Collections/Frozen/ClosedRangeInt32FrozenDictionary.cs Outdated Show resolved Hide resolved
...ries/System.Collections.Immutable/src/System/Collections/Frozen/ClosedRangeInt32FrozenSet.cs Outdated Show resolved Hide resolved
...ries/System.Collections.Immutable/src/System/Collections/Frozen/ClosedRangeInt32FrozenSet.cs Outdated Show resolved Hide resolved
src/libraries/System.Collections.Immutable/src/System/Collections/Frozen/FrozenDictionary.cs Outdated Show resolved Hide resolved
src/libraries/System.Collections.Immutable/src/System/Collections/Frozen/SmallInt32FrozenSet.cs Outdated Show resolved Hide resolved
...ries/System.Collections.Immutable/src/System/Collections/Frozen/SparseRangeInt32FrozenSet.cs Outdated Show resolved Hide resolved
...ries/System.Collections.Immutable/src/System/Collections/Frozen/SparseRangeInt32FrozenSet.cs Outdated Show resolved Hide resolved
...ries/System.Collections.Immutable/src/System/Collections/Frozen/SparseRangeInt32FrozenSet.cs Outdated Show resolved Hide resolved
...ries/System.Collections.Immutable/src/System/Collections/Frozen/SparseRangeInt32FrozenSet.cs Outdated Show resolved Hide resolved
@geeknoid geeknoid changed the title Add 5 more specialized frozen collection types. Add 7 more specialized frozen collection types. Dec 18, 2022
@danmoseley
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Is there an issue approving the API - or is this intended to start discussion...

@geeknoid
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@danmoseley There is no API change here, all these types are internal to the implementation of the existing frozen set and dictionary.

@build-analysis build-analysis bot mentioned this pull request Dec 22, 2022
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stephentoub
stephentoub reviewed Jan 3, 2023
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src/libraries/System.Collections.Immutable/src/System/Collections/Frozen/FrozenDictionary.cs Outdated Show resolved Hide resolved
src/libraries/System.Collections.Immutable/src/System/Collections/Frozen/FrozenDictionary.cs Outdated Show resolved Hide resolved
src/libraries/System.Collections.Immutable/src/System/Collections/Frozen/FrozenDictionary.cs Outdated Show resolved Hide resolved
src/libraries/System.Collections.Immutable/src/System/Collections/Frozen/FrozenDictionary.cs Outdated Show resolved Hide resolved
src/libraries/System.Collections.Immutable/src/System/Collections/Frozen/FrozenDictionary.cs Outdated Show resolved Hide resolved
....Collections.Immutable/src/System/Collections/Frozen/Integer/SmallIntegerFrozenDictionary.cs Outdated Show resolved Hide resolved
.../System.Collections.Immutable/src/System/Collections/Frozen/Integer/SmallIntegerFrozenSet.cs Outdated Show resolved Hide resolved
...ibraries/System.Collections.Immutable/src/System/Collections/Frozen/SmallFrozenDictionary.cs Outdated Show resolved Hide resolved
src/libraries/System.Collections.Immutable/src/System/Collections/Frozen/SmallFrozenSet.cs Outdated Show resolved Hide resolved
src/libraries/System.Collections.Immutable/tests/Frozen/FrozenSetTests.cs Show resolved Hide resolved
Add 7 more specialized frozen collection types.
a8cfa79 
- Add SmallFrozenDictionary/Set which don't do any hashing and simply iterate through arrays,
testing each element

- Add ClosedRangeInt32FrozenDictionary/Set which are used when the keys are in a
closed integer range.

- Add SparseRangeInt32FrozenSet which uses a bit vector for storage.

FrozenDictionary/Set each have some constants defined to drive the heuristics that
decide when to use the small and sparse collection types. I did some preliminary tuning
of these, but this could use a detailed benchmark to pick the right values. I'll leave
the fine-tuning to a separate PR.
@geeknoid geeknoid changed the title Add 7 more specialized frozen collection types. Add more specialized frozen collection types. Jan 4, 2023
This was referenced Jan 5, 2023
Closed
Closed
stephentoub
stephentoub approved these changes Jan 8, 2023
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src/libraries/System.Collections.Immutable/src/System/Collections/Frozen/Constants.cs Outdated Show resolved Hide resolved
src/libraries/System.Collections.Immutable/src/System/Collections/Frozen/FrozenDictionary.cs Show resolved Hide resolved
src/libraries/System.Collections.Immutable/src/System/Collections/Frozen/FrozenDictionary.cs Outdated Show resolved Hide resolved
src/libraries/System.Collections.Immutable/src/System/Collections/Frozen/FrozenSet.cs Outdated Show resolved Hide resolved
...ollections.Immutable/src/System/Collections/Frozen/Int32/ClosedRangeInt32FrozenDictionary.cs Outdated Show resolved Hide resolved
...ollections.Immutable/src/System/Collections/Frozen/Int32/ClosedRangeInt32FrozenDictionary.cs Outdated Show resolved Hide resolved
...es/System.Collections.Immutable/src/System/Collections/Frozen/Int32/Int32FrozenDictionary.cs Show resolved Hide resolved
...libraries/System.Collections.Immutable/src/System/Collections/Frozen/Int32/Int32FrozenSet.cs Show resolved Hide resolved
...ystem.Collections.Immutable/src/System/Collections/Frozen/Int32/SparseRangeInt32FrozenSet.cs Outdated Show resolved Hide resolved
...m.Collections.Immutable/src/System/Collections/Frozen/Integer/SparseRangeIntegerFrozenSet.cs Outdated Show resolved Hide resolved
@geeknoid geeknoid merged commit dcda1e0 into dotnet:main Jan 9, 2023
ViktorHofer
ViktorHofer reviewed Jan 10, 2023
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src/libraries/System.Collections.Immutable/src/System.Collections.Immutable.csproj
Comment on lines +47 to +49
<Compile Include="System\Collections\Frozen\Int32\SmallInt32FrozenDictionary.cs" Condition="!$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net7.0'))" />
<Compile Include="System\Collections\Frozen\Int32\SmallInt32FrozenSet.cs" Condition="!$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net7.0'))" />
<Compile Include="System\Collections\Frozen\Int32\SparseRangeInt32FrozenSet.cs" Condition="!$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net7.0'))" />
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These msbuild functions aren't cost-free and we usually try to not have them per compile item. Can you please move them into a separate ItemGroup? Same for the ones above (L39-43).

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WIll do.

@lewing lewing mentioned this pull request Jan 29, 2023
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@ghost ghost locked as resolved and limited conversation to collaborators Feb 9, 2023
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@teo-tsirpanis teo-tsirpanis teo-tsirpanis left review comments

@ViktorHofer ViktorHofer ViktorHofer left review comments

@gfoidl gfoidl gfoidl left review comments

@stephentoub stephentoub stephentoub approved these changes

@grbell-ms grbell-ms grbell-ms approved these changes

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