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[Perf] Linux/arm64: 35 Improvements on 4/12/2026 2:20:28 AM +00:00 #71497

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[Perf] Linux/arm64: 35 Improvements on 4/12/2026 2:20:28 AM +00:00#71497
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arch-arm64branch-refs/heads/maincompilationmode-tieredkind-microos-linuxperf-improvementrunkind-microruntime-coreclruntriaged

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@performanceautofiler
performanceautofiler
bot
opened on Apr 16, 2026

Run Information

Name Value
Architecture arm64
OS azurelinux 3.0
Queue CobaltAzureLinux
Baseline 280fb749167d6b0a42c9e5f90dc9b29730a09dac
Compare 6df558c6c4b6b13d3f40c21ac7d61cf7bc13b96e
Diff Diff
Configs CompilationMode:tiered, RunKind:micro

Improvements in System.Text.Json.Tests.Perf_Segment

Benchmark Baseline Test Test/Base Test Quality Edge Detector Baseline IR Compare IR IR Ratio
9.19 μs 8.41 μs 0.92 0.19 False
89.91 μs 82.47 μs 0.92 0.20 False
905.51 μs 831.05 μs 0.92 0.18 False
9.18 μs 8.44 μs 0.92 0.10 False
903.18 μs 831.07 μs 0.92 0.16 False
9.01 μs 8.29 μs 0.92 0.15 False
894.96 μs 823.83 μs 0.92 0.13 False
89.51 μs 82.40 μs 0.92 0.18 False
9.00 μs 8.30 μs 0.92 0.18 False
942.39 μs 869.76 μs 0.92 0.12 False
991.15 μs 919.93 μs 0.93 0.08 False
98.66 μs 91.62 μs 0.93 0.09 False
10.19 μs 9.56 μs 0.94 0.14 False

Test Report

Repro

General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Text.Json.Tests.Perf_Segment*'
Details

System.Text.Json.Tests.Perf_Segment.ReadMultiSegmentSequenceUsingSpan(segmentSize: 4096, TestCase: Json4KB)

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System.Text.Json.Tests.Perf_Segment.ReadSingleSegmentSequenceByN(numberOfBytes: 4096, TestCase: Json40KB)

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System.Text.Json.Tests.Perf_Segment.ReadSingleSegmentSequenceByN(numberOfBytes: 8192, TestCase: Json400KB)

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System.Text.Json.Tests.Perf_Segment.ReadMultiSegmentSequenceUsingSpan(segmentSize: 8192, TestCase: Json4KB)

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System.Text.Json.Tests.Perf_Segment.ReadSingleSegmentSequenceByN(numberOfBytes: 4096, TestCase: Json400KB)

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System.Text.Json.Tests.Perf_Segment.ReadSingleSegmentSequenceByN(numberOfBytes: 4096, TestCase: Json4KB)

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System.Text.Json.Tests.Perf_Segment.ReadSingleSegmentSequence(TestCase: Json400KB)

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System.Text.Json.Tests.Perf_Segment.ReadSingleSegmentSequence(TestCase: Json40KB)

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System.Text.Json.Tests.Perf_Segment.ReadSingleSegmentSequence(TestCase: Json4KB)

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System.Text.Json.Tests.Perf_Segment.ReadMultiSegmentSequenceUsingSpan(segmentSize: 4096, TestCase: Json400KB)

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JIT Disasms

System.Text.Json.Tests.Perf_Segment.ReadMultiSegmentSequence(segmentSize: 8192, TestCase: Json400KB)

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JIT Disasms

System.Text.Json.Tests.Perf_Segment.ReadMultiSegmentSequence(segmentSize: 4096, TestCase: Json40KB)

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System.Text.Json.Tests.Perf_Segment.ReadMultiSegmentSequence(segmentSize: 4096, TestCase: Json4KB)

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JIT Disasms

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

Run Information

Name Value
Architecture arm64
OS azurelinux 3.0
Queue CobaltAzureLinux
Baseline 280fb749167d6b0a42c9e5f90dc9b29730a09dac
Compare 6df558c6c4b6b13d3f40c21ac7d61cf7bc13b96e
Diff Diff
Configs CompilationMode:tiered, RunKind:micro

Improvements in System.Text.RegularExpressions.Tests.Perf_Regex_Industry_RustLang_Sherlock

Benchmark Baseline Test Test/Base Test Quality Edge Detector Baseline IR Compare IR IR Ratio
4.12 ms 3.42 ms 0.83 0.10 False
16.04 ms 13.96 ms 0.87 0.17 False
7.74 ms 6.82 ms 0.88 0.13 False
369.20 μs 328.45 μs 0.89 0.10 False
5.71 ms 5.34 ms 0.94 0.09 False
5.83 ms 5.46 ms 0.94 0.17 False

Test Report

Repro

General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Text.RegularExpressions.Tests.Perf_Regex_Industry_RustLang_Sherlock*'
Details

System.Text.RegularExpressions.Tests.Perf_Regex_Industry_RustLang_Sherlock.Count(Pattern: "(?i)Sherlock|Holmes|Watson|Irene|Adler|John|Baker", Options: Compiled)

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System.Text.RegularExpressions.Tests.Perf_Regex_Industry_RustLang_Sherlock.Count(Pattern: "\b\w+n\b", Options: Compiled)

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System.Text.RegularExpressions.Tests.Perf_Regex_Industry_RustLang_Sherlock.Count(Pattern: "[a-zA-Z]+ing", Options: Compiled)

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System.Text.RegularExpressions.Tests.Perf_Regex_Industry_RustLang_Sherlock.Count(Pattern: "Sherlock|Holmes|Watson|Irene|Adler|John|Baker", Options: Compiled)

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JIT Disasms

System.Text.RegularExpressions.Tests.Perf_Regex_Industry_RustLang_Sherlock.Count(Pattern: "\w+\s+Holmes", Options: Compiled)

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JIT Disasms

System.Text.RegularExpressions.Tests.Perf_Regex_Industry_RustLang_Sherlock.Count(Pattern: "\w+\s+Holmes\s+\w+", Options: Compiled)

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Histogram

JIT Disasms

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

Run Information

Name Value
Architecture arm64
OS azurelinux 3.0
Queue CobaltAzureLinux
Baseline 280fb749167d6b0a42c9e5f90dc9b29730a09dac
Compare 6df558c6c4b6b13d3f40c21ac7d61cf7bc13b96e
Diff Diff
Configs CompilationMode:tiered, RunKind:micro

Improvements in System.Text.RegularExpressions.Tests.Perf_Regex_Common

Benchmark Baseline Test Test/Base Test Quality Edge Detector Baseline IR Compare IR IR Ratio
86.88 μs 75.43 μs 0.87 0.11 False
85.49 μs 76.52 μs 0.90 0.23 False
84.20 μs 75.81 μs 0.90 0.15 False
85.03 μs 76.56 μs 0.90 0.15 False

Test Report

Repro

General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Text.RegularExpressions.Tests.Perf_Regex_Common*'
Details

System.Text.RegularExpressions.Tests.Perf_Regex_Common.MatchesBoundary(Options: Compiled)

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System.Text.RegularExpressions.Tests.Perf_Regex_Common.MatchesSet(Options: IgnoreCase, Compiled)

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System.Text.RegularExpressions.Tests.Perf_Regex_Common.MatchesBoundary(Options: IgnoreCase, Compiled)

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JIT Disasms

System.Text.RegularExpressions.Tests.Perf_Regex_Common.MatchesSet(Options: Compiled)

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JIT Disasms

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

Run Information

Name Value
Architecture arm64
OS azurelinux 3.0
Queue CobaltAzureLinux
Baseline 280fb749167d6b0a42c9e5f90dc9b29730a09dac
Compare 6df558c6c4b6b13d3f40c21ac7d61cf7bc13b96e
Diff Diff
Configs CompilationMode:tiered, RunKind:micro

Improvements in System.Buffers.Tests.SearchValuesByteTests

Benchmark Baseline Test Test/Base Test Quality Edge Detector Baseline IR Compare IR IR Ratio
19.13 ns 16.98 ns 0.89 0.15 False
20.69 ns 19.06 ns 0.92 0.12 False

Test Report

Repro

General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Buffers.Tests.SearchValuesByteTests*'
Details

System.Buffers.Tests.SearchValuesByteTests.IndexOfAny(Values: "abcdefABCDEF0123456789")

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JIT Disasms

System.Buffers.Tests.SearchValuesByteTests.IndexOfAnyExcept(Values: "abcdefABCDEF0123456789")

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Histogram

JIT Disasms

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

Run Information

Name Value
Architecture arm64
OS azurelinux 3.0
Queue CobaltAzureLinux
Baseline 280fb749167d6b0a42c9e5f90dc9b29730a09dac
Compare 6df558c6c4b6b13d3f40c21ac7d61cf7bc13b96e
Diff Diff
Configs CompilationMode:tiered, RunKind:micro

Improvements in System.Text.Json.Document.Tests.Perf_EnumerateArray

Benchmark Baseline Test Test/Base Test Quality Edge Detector Baseline IR Compare IR IR Ratio
8.79 μs 7.58 μs 0.86 0.17 False
718.97 μs 665.86 μs 0.93 0.17 False

Test Report

Repro

General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Text.Json.Document.Tests.Perf_EnumerateArray*'
Details

System.Text.Json.Document.Tests.Perf_EnumerateArray.Parse(TestCase: ArrayOfStrings)

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JIT Disasms

System.Text.Json.Document.Tests.Perf_EnumerateArray.Parse(TestCase: Json400KB)

ETL Files

Histogram

JIT Disasms

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

Run Information

Name Value
Architecture arm64
OS azurelinux 3.0
Queue CobaltAzureLinux
Baseline 280fb749167d6b0a42c9e5f90dc9b29730a09dac
Compare 6df558c6c4b6b13d3f40c21ac7d61cf7bc13b96e
Diff Diff
Configs CompilationMode:tiered, RunKind:micro

Improvements in System.Text.Json.Tests.Perf_Depth

Benchmark Baseline Test Test/Base Test Quality Edge Detector Baseline IR Compare IR IR Ratio
2.70 μs 2.39 μs 0.88 0.14 False
2.50 μs 2.33 μs 0.93 0.22 False

Test Report

Repro

General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Text.Json.Tests.Perf_Depth*'
Details

System.Text.Json.Tests.Perf_Depth.ReadSpanEmptyLoop(Depth: 65)

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System.Text.Json.Tests.Perf_Depth.ReadSpanEmptyLoop(Depth: 64)

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Histogram

JIT Disasms

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

Run Information

Name Value
Architecture arm64
OS azurelinux 3.0
Queue CobaltAzureLinux
Baseline 280fb749167d6b0a42c9e5f90dc9b29730a09dac
Compare 6df558c6c4b6b13d3f40c21ac7d61cf7bc13b96e
Diff Diff
Configs CompilationMode:tiered, RunKind:micro

Improvements in System.Collections.ContainsTrue<Int32>

Benchmark Baseline Test Test/Base Test Quality Edge Detector Baseline IR Compare IR IR Ratio
37.31 μs 32.63 μs 0.87 0.17 False

Test Report

Repro

General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Collections.ContainsTrue<Int32>*'
Details

System.Collections.ContainsTrue<Int32>.Stack(Size: 512)

ETL Files

Histogram

JIT Disasms

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

Run Information

Name Value
Architecture arm64
OS azurelinux 3.0
Queue CobaltAzureLinux
Baseline 280fb749167d6b0a42c9e5f90dc9b29730a09dac
Compare 6df558c6c4b6b13d3f40c21ac7d61cf7bc13b96e
Diff Diff
Configs CompilationMode:tiered, RunKind:micro

Improvements in System.Text.Json.Document.Tests.Perf_DocumentParse

Benchmark Baseline Test Test/Base Test Quality Edge Detector Baseline IR Compare IR IR Ratio
726.03 μs 677.92 μs 0.93 0.14 False

Test Report

Repro

General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Text.Json.Document.Tests.Perf_DocumentParse*'
Details

System.Text.Json.Document.Tests.Perf_DocumentParse.Parse(IsDataIndented: False, TestRandomAccess: False, TestCase: Json400KB)

ETL Files

Histogram

JIT Disasms

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

Run Information

Name Value
Architecture arm64
OS azurelinux 3.0
Queue CobaltAzureLinux
Baseline 280fb749167d6b0a42c9e5f90dc9b29730a09dac
Compare 6df558c6c4b6b13d3f40c21ac7d61cf7bc13b96e
Diff Diff
Configs CompilationMode:tiered, RunKind:micro

Improvements in System.Buffers.Tests.SearchValuesCharTests

Benchmark Baseline Test Test/Base Test Quality Edge Detector Baseline IR Compare IR IR Ratio
26.18 ns 23.36 ns 0.89 0.18 False

Test Report

Repro

General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Buffers.Tests.SearchValuesCharTests*'
Details

System.Buffers.Tests.SearchValuesCharTests.LastIndexOfAny(Values: "abcdefABCDEF0123456789")

ETL Files

Histogram

JIT Disasms

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

Activity

  1. performanceautofiler
    added
    arch-arm64
    branch-refs/heads/main
    compilationmode-tiered
    kind-micro
    os-linux
    perf-improvement
    runkind-micro
    runtime-coreclr
    untriaged
    on Apr 16, 2026

  2. performanceautofiler commented on Apr 16, 2026

    @performanceautofiler
    performanceautofilerBot
    on Apr 16, 2026 – with PerformanceAutoFiler
    Author

    Run Information

    Name Value
    Architecture arm64
    OS azurelinux 3.0
    Queue CobaltAzureLinux
    Baseline 280fb749167d6b0a42c9e5f90dc9b29730a09dac
    Compare 6df558c6c4b6b13d3f40c21ac7d61cf7bc13b96e
    Diff Diff
    Configs CompilationMode:tiered, RunKind:micro

    Improvements in System.Text.RegularExpressions.Tests.Perf_Regex_Industry_Leipzig

    Benchmark Baseline Test Test/Base Test Quality Edge Detector Baseline IR Compare IR IR Ratio
    54.43 ms 46.33 ms 0.85 0.10 False

    Test Report

    Repro

    General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

    git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Text.RegularExpressions.Tests.Perf_Regex_Industry_Leipzig*'
    Details

    System.Text.RegularExpressions.Tests.Perf_Regex_Industry_Leipzig.Count(Pattern: "(?i)Tom|Sawyer|Huckleberry|Finn", Options: Compiled)

    ETL Files

    Histogram

    JIT Disasms

    Docs

    Profiling workflow for dotnet/runtime repository
    Benchmarking workflow for dotnet/runtime repository

    Run Information

    Name Value
    Architecture arm64
    OS azurelinux 3.0
    Queue CobaltAzureLinux
    Baseline 280fb749167d6b0a42c9e5f90dc9b29730a09dac
    Compare 6df558c6c4b6b13d3f40c21ac7d61cf7bc13b96e
    Diff Diff
    Configs CompilationMode:tiered, RunKind:micro

    Improvements in System.Text.Json.Document.Tests.Perf_EnumerateObject

    Benchmark Baseline Test Test/Base Test Quality Edge Detector Baseline IR Compare IR IR Ratio
    16.79 μs 14.83 μs 0.88 0.15 False

    Test Report

    Repro

    General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

    git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Text.Json.Document.Tests.Perf_EnumerateObject*'
    Details

    System.Text.Json.Document.Tests.Perf_EnumerateObject.Parse(TestCase: StringProperties)

    ETL Files

    Histogram

    JIT Disasms

    Docs

    Profiling workflow for dotnet/runtime repository
    Benchmarking workflow for dotnet/runtime repository

    Run Information

    Name Value
    Architecture arm64
    OS azurelinux 3.0
    Queue CobaltAzureLinux
    Baseline 280fb749167d6b0a42c9e5f90dc9b29730a09dac
    Compare 6df558c6c4b6b13d3f40c21ac7d61cf7bc13b96e
    Diff Diff
    Configs CompilationMode:tiered, RunKind:micro

    Improvements in System.Memory.Span<Byte>

    Benchmark Baseline Test Test/Base Test Quality Edge Detector Baseline IR Compare IR IR Ratio
    19.58 ns 16.82 ns 0.86 0.20 False

    Test Report

    Repro

    General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

    git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Memory.Span<Byte>*'
    Details

    System.Memory.Span<Byte>.LastIndexOfValue(Size: 512)

    ETL Files

    Histogram

    JIT Disasms

    Docs

    Profiling workflow for dotnet/runtime repository
    Benchmarking workflow for dotnet/runtime repository

  3. performanceautofiler
    added
    branch-refs/heads/main
    arch-arm64
    runtime-coreclr
    kind-micro
    compilationmode-tiered
    runkind-micro
    on Apr 16, 2026
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