[corefoundation] Cache kCFNull to avoid native calls
#15146
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Calling `Dlfcn.GetIntPtr` is quite slow and doing for each element of an native array slows them down. **Before** ``` BenchmarkDotNet=v0.12.1, OS=macOS 12.3.1 (21E258) [Darwin 21.4.0] Apple M1 2.40GHz, 1 CPU, 8 logical and 8 physical cores .NET Core SDK= 6.0.100 [/usr/local/share/dotnet/sdk] [Host] : .NET Core 6.0 (CoreCLR 6.0.522.21309, CoreFX 6.0.522.21309), X64 RyuJIT Job=InProcess Toolchain=InProcessEmitToolchain IterationCount=3 LaunchCount=1 WarmupCount=3 ``` | Method | Length | Mean | Error | StdDev | |-------------------- |------- |----------------:|--------------:|-------------:| | ArrayFromHandleFunc | 0 | 140.98 ns | 10.995 ns | 0.603 ns | | ArrayFromHandleFunc | 1 | 650.99 ns | 34.037 ns | 1.866 ns | | ArrayFromHandleFunc | 16 | 6,884.68 ns | 284.458 ns | 15.592 ns | | ArrayFromHandleFunc | 256 | 101,171.27 ns | 675.731 ns | 37.039 ns | | ArrayFromHandleFunc | 4096 | 1,634,001.93 ns | 55,113.362 ns | 3,020.949 ns | **After** ``` BenchmarkDotNet=v0.12.1, OS=macOS 12.3.1 (21E258) [Darwin 21.4.0] Apple M1 2.40GHz, 1 CPU, 8 logical and 8 physical cores .NET Core SDK= 6.0.100 [/usr/local/share/dotnet/sdk] [Host] : .NET Core 6.0 (CoreCLR 6.0.522.21309, CoreFX 6.0.522.21309), X64 RyuJIT Job=InProcess Toolchain=InProcessEmitToolchain IterationCount=3 LaunchCount=1 WarmupCount=3 ``` | Method | Length | Mean | Error | StdDev | |-------------------- |------- |--------------:|-------------:|-----------:| | ArrayFromHandleFunc | 0 | 141.48 ns | 3.905 ns | 0.214 ns | | ArrayFromHandleFunc | 1 | 307.06 ns | 9.457 ns | 0.518 ns | | ArrayFromHandleFunc | 16 | 1,227.28 ns | 13.334 ns | 0.731 ns | | ArrayFromHandleFunc | 256 | 14,076.72 ns | 418.940 ns | 22.963 ns | | ArrayFromHandleFunc | 4096 | 251,251.85 ns | 7,341.339 ns | 402.404 ns |
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dalexsoto
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Noticed the UPDATE: Original description updated with |
💻 [PR Build] Tests on macOS Mac Catalina (10.15) passed 💻✅ All tests on macOS Mac Catalina (10.15) passed. Pipeline on Agent |
📋 [PR Build] API Diff 📋API diff (for current PR)ℹ️ API Diff (from PR only) (please review changes) .NETXamarin vs .NETAPI diff (vs stable)✅ API Diff from stable .NETXamarin vs .NETGenerator diffℹ️ Generator Diff (please review changes) Pipeline on Agent XAMBOT-1023.Monterey |
❌ [PR Build] Tests on macOS M1 - Mac Big Sur (11.5) failed ❌Failed tests are:
Pipeline on Agent |
❌ [CI Build] Tests failed on VSTS: simulator tests iOS ❌Tests failed on VSTS: simulator tests iOS. Test results4 tests failed, 144 tests passed.Failed tests
Pipeline on Agent XAMBOT-1043.Monterey' |
rolfbjarne
approved these changes
May 30, 2022
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Test failures are unrelated (https://github.com/xamarin/maccore/issues/2558). |
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Calling
Dlfcn.GetIntPtris quite slow and doing for each element ofan native array slows them down.
Before
After