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[Perf] Linux/x64: 80 Regressions on 6/24/2026 7:31:32 AM +00:00 #75007

Description

@performanceautofiler

Run Information

Name Value
Architecture x64
OS ubuntu 22.04
Queue ViperUbuntu
Baseline 0d1a20fb14109f277df06ebee3f83c964f9dcc61
Compare e3cbc00cd3e0b511ad36dc240010eb2b9eefc3b7
Diff Diff
Configs AOT:true, CompilationMode:wasm, RunKind:micro

Regressions in System.Text.Json.Tests.Perf_Reader

Benchmark Baseline Test Test/Base Test Quality Edge Detector Baseline IR Compare IR IR Ratio
1.89 μs 3.34 μs 1.77 0.10 False
73.41 μs 128.28 μs 1.75 0.10 False
7.53 μs 12.96 μs 1.72 0.06 False
74.67 μs 128.04 μs 1.71 0.09 False
1.97 μs 3.38 μs 1.71 0.09 False
11.75 μs 20.11 μs 1.71 0.07 False
11.72 μs 19.95 μs 1.70 0.05 False
974.34 ns 1658.09 ns 1.70 0.07 False
7.53 μs 12.80 μs 1.70 0.10 False
939.55 ns 1575.68 ns 1.68 0.08 False
2.99 μs 5.00 μs 1.67 0.07 False
13.60 μs 22.72 μs 1.67 0.07 False
86.34 μs 143.81 μs 1.67 0.12 False
8.98 μs 14.90 μs 1.66 0.11 False
3.03 μs 5.00 μs 1.65 0.06 False
14.18 μs 23.18 μs 1.63 0.06 False
94.62 μs 151.19 μs 1.60 0.08 False
8.98 μs 14.34 μs 1.60 0.07 False
2.46 μs 3.85 μs 1.57 0.09 False
4.17 μs 6.51 μs 1.56 0.14 False
1.13 μs 1.76 μs 1.56 0.10 False
3.55 μs 5.46 μs 1.54 0.11 False
1.32 μs 1.98 μs 1.50 0.07 False
7.78 μs 11.66 μs 1.50 0.08 False
2.45 μs 3.66 μs 1.49 0.09 False
131.34 ns 194.35 ns 1.48 0.16 False
6.91 μs 10.19 μs 1.47 0.08 False
6.84 μs 9.93 μs 1.45 0.06 False
157.45 ns 218.95 ns 1.39 0.17 False
8.31 μs 11.53 μs 1.39 0.04 False
169.36 ns 231.67 ns 1.37 0.14 False
337.44 ns 411.93 ns 1.22 0.14 False

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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
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Text.Json.Tests.Perf_Reader*'
Details

System.Text.Json.Tests.Perf_Reader.ReadSpanEmptyLoop(IsDataCompact: False, TestCase: LotsOfStrings)

ETL Files

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JIT Disasms

System.Text.Json.Tests.Perf_Reader.ReadSpanEmptyLoop(IsDataCompact: False, TestCase: Json40KB)

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JIT Disasms

System.Text.Json.Tests.Perf_Reader.ReadSingleSpanSequenceEmptyLoop(IsDataCompact: False, TestCase: Json4KB)

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System.Text.Json.Tests.Perf_Reader.ReadSingleSpanSequenceEmptyLoop(IsDataCompact: False, TestCase: Json40KB)

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JIT Disasms

System.Text.Json.Tests.Perf_Reader.ReadSingleSpanSequenceEmptyLoop(IsDataCompact: False, TestCase: LotsOfStrings)

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JIT Disasms

System.Text.Json.Tests.Perf_Reader.ReadSpanEmptyLoop(IsDataCompact: False, TestCase: BroadTree)

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JIT Disasms

System.Text.Json.Tests.Perf_Reader.ReadSingleSpanSequenceEmptyLoop(IsDataCompact: False, TestCase: BroadTree)

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System.Text.Json.Tests.Perf_Reader.ReadSingleSpanSequenceEmptyLoop(IsDataCompact: False, TestCase: Json400B)

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System.Text.Json.Tests.Perf_Reader.ReadSpanEmptyLoop(IsDataCompact: False, TestCase: Json4KB)

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JIT Disasms

System.Text.Json.Tests.Perf_Reader.ReadSpanEmptyLoop(IsDataCompact: False, TestCase: Json400B)

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JIT Disasms

System.Text.Json.Tests.Perf_Reader.ReadSpanEmptyLoop(IsDataCompact: False, TestCase: LotsOfNumbers)

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System.Text.Json.Tests.Perf_Reader.ReadReturnBytes(IsDataCompact: False, TestCase: BroadTree)

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System.Text.Json.Tests.Perf_Reader.ReadMultiSpanSequenceEmptyLoop(IsDataCompact: False, TestCase: Json40KB)

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System.Text.Json.Tests.Perf_Reader.ReadReturnBytes(IsDataCompact: False, TestCase: Json4KB)

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JIT Disasms

System.Text.Json.Tests.Perf_Reader.ReadSingleSpanSequenceEmptyLoop(IsDataCompact: False, TestCase: LotsOfNumbers)

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JIT Disasms

System.Text.Json.Tests.Perf_Reader.ReadMultiSpanSequenceEmptyLoop(IsDataCompact: False, TestCase: BroadTree)

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JIT Disasms

System.Text.Json.Tests.Perf_Reader.ReadReturnBytes(IsDataCompact: False, TestCase: Json40KB)

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JIT Disasms

System.Text.Json.Tests.Perf_Reader.ReadMultiSpanSequenceEmptyLoop(IsDataCompact: False, TestCase: Json4KB)

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JIT Disasms

System.Text.Json.Tests.Perf_Reader.ReadMultiSpanSequenceEmptyLoop(IsDataCompact: False, TestCase: LotsOfStrings)

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JIT Disasms

System.Text.Json.Tests.Perf_Reader.ReadMultiSpanSequenceEmptyLoop(IsDataCompact: False, TestCase: LotsOfNumbers)

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JIT Disasms

System.Text.Json.Tests.Perf_Reader.ReadReturnBytes(IsDataCompact: False, TestCase: Json400B)

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System.Text.Json.Tests.Perf_Reader.ReadReturnBytes(IsDataCompact: False, TestCase: LotsOfNumbers)

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JIT Disasms

System.Text.Json.Tests.Perf_Reader.ReadMultiSpanSequenceEmptyLoop(IsDataCompact: False, TestCase: Json400B)

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JIT Disasms

System.Text.Json.Tests.Perf_Reader.ReadReturnBytes(IsDataCompact: False, TestCase: DeepTree)

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System.Text.Json.Tests.Perf_Reader.ReadReturnBytes(IsDataCompact: False, TestCase: LotsOfStrings)

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JIT Disasms

System.Text.Json.Tests.Perf_Reader.ReadSpanEmptyLoop(IsDataCompact: False, TestCase: HelloWorld)

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System.Text.Json.Tests.Perf_Reader.ReadSingleSpanSequenceEmptyLoop(IsDataCompact: False, TestCase: DeepTree)

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JIT Disasms

System.Text.Json.Tests.Perf_Reader.ReadSpanEmptyLoop(IsDataCompact: False, TestCase: DeepTree)

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JIT Disasms

System.Text.Json.Tests.Perf_Reader.ReadReturnBytes(IsDataCompact: False, TestCase: HelloWorld)

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JIT Disasms

System.Text.Json.Tests.Perf_Reader.ReadMultiSpanSequenceEmptyLoop(IsDataCompact: False, TestCase: DeepTree)

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JIT Disasms

System.Text.Json.Tests.Perf_Reader.ReadSingleSpanSequenceEmptyLoop(IsDataCompact: False, TestCase: HelloWorld)

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System.Text.Json.Tests.Perf_Reader.ReadMultiSpanSequenceEmptyLoop(IsDataCompact: False, TestCase: HelloWorld)

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JIT Disasms

Docs

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

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