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[Perf] Linux/arm64: 559 Regressions on 2/20/2026 10:36:07 PM +00:00 #125085

@performanceautofiler

Description

@performanceautofiler

Run Information

Name Value
Architecture arm64
OS ubuntu 22.04
Queue AmpereUbuntu
Baseline ab11a456596ec096aa644c603f4a9121dd6bc3c9
Compare 213a41d3d95b44fc903a6f2783c58aca6d774ad5
Diff Diff
Configs CompilationMode:tiered, RunKind:micro

Regressions in System.Tests.Perf_Int32

Benchmark Baseline Test Test/Base Test Quality Edge Detector Baseline IR Compare IR IR Ratio
6.71 ns 14.52 ns 2.17 0.20 False
7.04 ns 15.36 ns 2.18 0.20 False
5.91 ns 13.73 ns 2.32 0.18 False
10.98 ns 18.86 ns 1.72 0.16 False
16.78 ns 19.38 ns 1.15 0.27 False
17.61 ns 25.76 ns 1.46 0.09 False
17.85 ns 25.99 ns 1.46 0.10 False
20.84 ns 31.86 ns 1.53 0.14 False
15.02 ns 23.89 ns 1.59 0.14 False
15.03 ns 17.77 ns 1.18 0.33 False
21.81 ns 25.04 ns 1.15 0.27 False
12.66 ns 15.81 ns 1.25 0.38 False
7.08 ns 14.48 ns 2.04 0.18 False
10.26 ns 13.29 ns 1.30 0.45 False
6.75 ns 14.47 ns 2.14 0.16 False
17.85 ns 25.68 ns 1.44 0.09 False
36.45 ns 46.40 ns 1.27 0.06 False
11.15 ns 18.87 ns 1.69 0.17 False
17.71 ns 26.00 ns 1.47 0.08 False
37.77 ns 45.66 ns 1.21 0.04 False
18.87 ns 27.75 ns 1.47 0.05 False
21.80 ns 25.06 ns 1.15 0.11 False
17.71 ns 25.72 ns 1.45 0.07 False
11.03 ns 18.97 ns 1.72 0.17 False
17.78 ns 25.75 ns 1.45 0.10 False
17.76 ns 25.92 ns 1.46 0.07 False
17.90 ns 26.06 ns 1.46 0.10 False
11.12 ns 18.87 ns 1.70 0.16 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.Tests.Perf_Int32*'
Details

System.Tests.Perf_Int32.TryParse(value: "4")

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JIT Disasms

System.Tests.Perf_Int32.TryParseSpan(value: "4")

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System.Tests.Perf_Int32.ParseHex(value: "4")

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System.Tests.Perf_Int32.Parse(value: "12345")

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System.Tests.Perf_Int32.ToStringHex(value: 12345)

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System.Tests.Perf_Int32.Parse(value: "2147483647")

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System.Tests.Perf_Int32.TryParse(value: "-2147483648")

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System.Tests.Perf_Int32.ToString(value: -2147483648)

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System.Tests.Perf_Int32.TryFormat(value: -2147483648)

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System.Tests.Perf_Int32.ToString(value: 2147483647)

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System.Tests.Perf_Int32.ToStringHex(value: -2147483648)

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System.Tests.Perf_Int32.ToStringHex(value: 4)

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System.Tests.Perf_Int32.ParseSpan(value: "4")

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System.Tests.Perf_Int32.ToString(value: 12345)

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System.Tests.Perf_Int32.Parse(value: "4")

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System.Tests.Perf_Int32.TryParseSpan(value: "2147483647")

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System.Tests.Perf_Int32.ParseHex(value: "7FFFFFFF")

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System.Tests.Perf_Int32.TryParseSpan(value: "12345")

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System.Tests.Perf_Int32.Parse(value: "-2147483648")

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System.Tests.Perf_Int32.ParseHex(value: "80000000")

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System.Tests.Perf_Int32.ParseHex(value: "3039")

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System.Tests.Perf_Int32.ToStringHex(value: 2147483647)

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JIT Disasms

System.Tests.Perf_Int32.ParseSpan(value: "2147483647")

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JIT Disasms

System.Tests.Perf_Int32.TryParse(value: "12345")

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Histogram

JIT Disasms

System.Tests.Perf_Int32.TryParse(value: "2147483647")

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Histogram

JIT Disasms

System.Tests.Perf_Int32.ParseSpan(value: "-2147483648")

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JIT Disasms

System.Tests.Perf_Int32.TryParseSpan(value: "-2147483648")

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Histogram

JIT Disasms

System.Tests.Perf_Int32.ParseSpan(value: "12345")

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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 ubuntu 22.04
Queue AmpereUbuntu
Baseline ab11a456596ec096aa644c603f4a9121dd6bc3c9
Compare 213a41d3d95b44fc903a6f2783c58aca6d774ad5
Diff Diff
Configs CompilationMode:tiered, RunKind:micro

Regressions in System.Text.Json.Serialization.Tests.WriteJson<Nullable<DateTimeOffset>>

Benchmark Baseline Test Test/Base Test Quality Edge Detector Baseline IR Compare IR IR Ratio
204.66 ns 258.38 ns 1.26 0.21 False
147.95 ns 187.93 ns 1.27 0.00 False
225.67 ns 269.77 ns 1.20 0.05 False
204.45 ns 258.38 ns 1.26 0.17 False
128.53 ns 167.50 ns 1.30 0.00 False
221.56 ns 254.17 ns 1.15 0.04 False
129.08 ns 167.73 ns 1.30 0.01 False
148.45 ns 188.09 ns 1.27 0.00 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.Serialization.Tests.WriteJson<Nullable<DateTimeOffset>>*'
Details

System.Text.Json.Serialization.Tests.WriteJson<Nullable<DateTimeOffset>>.SerializeToStream(Mode: SourceGen)

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JIT Disasms

System.Text.Json.Serialization.Tests.WriteJson<Nullable<DateTimeOffset>>.SerializeToString(Mode: SourceGen)

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JIT Disasms

System.Text.Json.Serialization.Tests.WriteJson<Nullable<DateTimeOffset>>.SerializeObjectProperty(Mode: Reflection)

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JIT Disasms

System.Text.Json.Serialization.Tests.WriteJson<Nullable<DateTimeOffset>>.SerializeToStream(Mode: Reflection)

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JIT Disasms

System.Text.Json.Serialization.Tests.WriteJson<Nullable<DateTimeOffset>>.SerializeToUtf8Bytes(Mode: Reflection)

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JIT Disasms

System.Text.Json.Serialization.Tests.WriteJson<Nullable<DateTimeOffset>>.SerializeObjectProperty(Mode: SourceGen)

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JIT Disasms

System.Text.Json.Serialization.Tests.WriteJson<Nullable<DateTimeOffset>>.SerializeToUtf8Bytes(Mode: SourceGen)

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JIT Disasms

System.Text.Json.Serialization.Tests.WriteJson<Nullable<DateTimeOffset>>.SerializeToString(Mode: Reflection)

ETL Files

Histogram

JIT Disasms

Docs

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

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    arch-arm64area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMIos-linuxLinux OS (any supported distro)runtime-coreclrspecific to the CoreCLR runtimetenet-performancePerformance related issuetenet-performance-benchmarksIssue from performance benchmarkuntriagedNew issue has not been triaged by the area owner

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