Razor TagHelperDescriptor Hashing #24551
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1/2 PRs for https://github.com/dotnet/aspnetcore/issues/23170 The other PR will be in aspnetcore-tooling to utilize these changes.
TanayParikh
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Aug 4, 2020
| using System.Collections.Generic; | ||
| using Microsoft.AspNetCore.Razor.Language; | ||
| using Newtonsoft.Json; | ||
| using Newtonsoft.Json.Linq; |
TanayParikh
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2/2 PRs for https://github.com/dotnet/aspnetcore/issues/23170 Other PR: dotnet/aspnetcore#24551 - Used the project for a short period of time - Created a file, navigated between files, made some edits. - I ran into 238 cache misses (unique taghelper allocations) and 4612 cache hits - 95%+ cache hit - Scales up incredibly well. Number of TagHelperDescriptors unlikely to change unless - New files added - New assemblies / packages added ### Benchmarks | Method | Mean | Error | StdDev | Op/s | Allocated | |------------------------- |---------:|---------:|---------:|--------:|----------:| | 'TagHelpers GetHashCode' | 0.137 ms | 1.279 us | 1.196 us | 7,306.8 | 17.93 KB | | Method | Mean | Error | StdDev | Op/s | Gen 0 | Gen 1 | Gen 2 | Allocated | |----------------------------------------------------|---------:|----------:|----------:|------:|--------:|--------:|--------:|----------:| | 'Cached Razor TagHelper Roundtrip Serialization' | 3.243 ms | 0.0634 ms | 0.0593 ms | 308.4 | 42.9688 | 39.0625 | 35.1563 | 1.95 MB | | 'Uncached Razor TagHelper Roundtrip Serialization' | 4.891 ms | 0.1082 ms | 0.0959 ms | 204.4 | 78.1250 | 54.6875 | 39.0625 | 3.85 MB | Note `GetHashCode` has minimal perf overhead in comparison to the underlying serialization/deserialization cost. As a result we get 33% faster roundtrip serialization and half the memory utilization. | Method | Mean | Error | StdDev | Op/s | Gen 0 | Gen 1 | Gen 2 | Allocated | |------------------------------------------ |---------:|----------:|----------:|------:|--------:|--------:|--------:|----------:| | 'Before Razor TagHelper Serialization' | 1.782 ms | 0.0353 ms | 0.0378 ms | 561.3 | 35.1563 | 35.1563 | 35.1563 | 1.11 MB | | 'After Razor TagHelper Serialization' | 1.932 ms | 0.0385 ms | 0.0632 ms | 517.6 | 35.1563 | 35.1563 | 35.1563 | 1.13 MB | | 'Before Razor TagHelper Deserialization' | 4.198 ms | 0.0173 ms | 0.0161 ms | 238.2 | 39.0625 | 15.6250 | - | 3.28 MB | | 'After Razor TagHelper Deserialization' | 4.279 ms | 0.0215 ms | 0.0201 ms | 233.7 | 39.0625 | 15.6250 | - | 3.29 MB | Note, marginally higher CPU/Memory for unidirectional serialization/deserialization due to cost of hashing. Note this benchmark would not benefit for caching.
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src/Razor/Microsoft.AspNetCore.Razor.Language/src/TagHelperDescriptorCache.cs
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https://dev.azure.com/dnceng/public/_build/results?buildId=756677&view=ms.vss-test-web.build-test-results-tab&runId=23487428&resultId=102773&paneView=debug > Manifest resource: Microsoft.AspNetCore.Razor.Language.Test.TestFiles.taghelpers.json not found\nExpected: True\nActual: False
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src/Razor/Microsoft.AspNetCore.Razor.Language/src/TagHelperDescriptorComparer.cs
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* TagHelperDescriptor Hashing and Caching 2/2 PRs for https://github.com/dotnet/aspnetcore/issues/23170 Other PR: dotnet/aspnetcore#24551 - Used the project for a short period of time - Created a file, navigated between files, made some edits. - I ran into 238 cache misses (unique taghelper allocations) and 4612 cache hits - 95%+ cache hit - Scales up incredibly well. Number of TagHelperDescriptors unlikely to change unless - New files added - New assemblies / packages added ### Benchmarks | Method | Mean | Error | StdDev | Op/s | Allocated | |------------------------- |---------:|---------:|---------:|--------:|----------:| | 'TagHelpers GetHashCode' | 0.137 ms | 1.279 us | 1.196 us | 7,306.8 | 17.93 KB | | Method | Mean | Error | StdDev | Op/s | Gen 0 | Gen 1 | Gen 2 | Allocated | |----------------------------------------------------|---------:|----------:|----------:|------:|--------:|--------:|--------:|----------:| | 'Cached Razor TagHelper Roundtrip Serialization' | 3.243 ms | 0.0634 ms | 0.0593 ms | 308.4 | 42.9688 | 39.0625 | 35.1563 | 1.95 MB | | 'Uncached Razor TagHelper Roundtrip Serialization' | 4.891 ms | 0.1082 ms | 0.0959 ms | 204.4 | 78.1250 | 54.6875 | 39.0625 | 3.85 MB | Note `GetHashCode` has minimal perf overhead in comparison to the underlying serialization/deserialization cost. As a result we get 33% faster roundtrip serialization and half the memory utilization. | Method | Mean | Error | StdDev | Op/s | Gen 0 | Gen 1 | Gen 2 | Allocated | |------------------------------------------ |---------:|----------:|----------:|------:|--------:|--------:|--------:|----------:| | 'Before Razor TagHelper Serialization' | 1.782 ms | 0.0353 ms | 0.0378 ms | 561.3 | 35.1563 | 35.1563 | 35.1563 | 1.11 MB | | 'After Razor TagHelper Serialization' | 1.932 ms | 0.0385 ms | 0.0632 ms | 517.6 | 35.1563 | 35.1563 | 35.1563 | 1.13 MB | | 'Before Razor TagHelper Deserialization' | 4.198 ms | 0.0173 ms | 0.0161 ms | 238.2 | 39.0625 | 15.6250 | - | 3.28 MB | | 'After Razor TagHelper Deserialization' | 4.279 ms | 0.0215 ms | 0.0201 ms | 233.7 | 39.0625 | 15.6250 | - | 3.29 MB | Note, marginally higher CPU/Memory for unidirectional serialization/deserialization due to cost of hashing. Note this benchmark would not benefit for caching. * Add duplicate key safeguard in memory cache https://dev.azure.com/dnceng/public/_build/results?buildId=757405&view=ms.vss-test-web.build-test-results-tab&runId=23507082&resultId=100079&paneView=debug > System.ArgumentException : The key already existed in the dictionary.
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1/2 PRs for https://github.com/dotnet/aspnetcore/issues/23170
TagHelperDescriptorto minimize collisions.TagHelperDescriptormemory cache.The other PR utilizes these changes: dotnet/razor#2307