dotnet / dotnet/perf-autofiling-issues

[Perf] Linux/arm64: 24 Regressions on 8/8/2026 4:13:10 AM +00:00

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arch-arm64 branch-refs/heads/main compilationmode-tiered kind-micro Look Again os-linux perf-regression PGO r2rtype-r2r_interpreter runkind-micro runtime-coreclr untriaged
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Description

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | azurelinux 3.0
Queue | CobaltAzureLinux
Baseline | [7da460b99b9c7e76b3060ef6da6687a008263ab9](https://github.com/dotnet/runtime/commit/7da460b99b9c7e76b3060ef6da6687a008263ab9)
Compare | [f5f5f83dd8676416636eda75d8c091c6c4f8d506](https://github.com/dotnet/runtime/commit/f5f5f83dd8676416636eda75d8c091c6c4f8d506)
Diff | [Diff](https://github.com/dotnet/runtime/compare/7da460b99b9c7e76b3060ef6da6687a008263ab9...f5f5f83dd8676416636eda75d8c091c6c4f8d506)
Configs | CompilationMode:tiered, R2RType:r2r_interpreter, RunKind:micro

### Regressions in Exceptions.Handling

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|

  • [ThrowAndCatchDeepRecursive - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 29.03 μs | 36.37 μs | 1.25 | 0.47 | False | | |
|
  • [ThrowAndCatchDeepRecursive - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 12.67 μs | 15.73 μs | 1.24 | 0.08 | False | | |
|
  • [ThrowAndCatchDeep - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 12.05 μs | 14.94 μs | 1.24 | 0.11 | False | | |
|
  • [ThrowAndCatchWhenFinally - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 3.84 μs | 4.68 μs | 1.22 | 0.09 | False | | |
|
  • [ThrowAndCatchDeepRecursive - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 24.18 μs | 29.36 μs | 1.21 | 0.08 | False | | |
|
  • [ThrowAndCatchWhen - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 3.88 μs | 4.60 μs | 1.19 | 0.10 | False | | |
|
  • [TryAndCatchDeep_CaugtAtTheTop - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 14.57 μs | 17.21 μs | 1.18 | 0.12 | False | | |
|
  • [CatchAndRethrowDeep - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 42.61 μs | 49.98 μs | 1.17 | 0.10 | False | | |
|
  • [MultipleNestedTryCatch_FirstCatches - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 3.05 μs | 3.58 μs | 1.17 | 0.07 | False | | |
|
  • [ThrowAndCatchDeepRecursive - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 17.35 μs | 20.08 μs | 1.16 | 0.12 | False | | |
|
  • [ThrowAndCatchFinally - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 3.06 μs | 3.54 μs | 1.16 | 0.05 | False | | |
|
  • [ThrowAndCatch - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 3.05 μs | 3.51 μs | 1.15 | 0.07 | False | | |
|
  • [CatchAndThrowOtherDeep - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 47.20 μs | 54.18 μs | 1.15 | 0.11 | False | | |
|
  • [MultipleNestedTryFinally - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 3.54 μs | 4.05 μs | 1.15 | 0.10 | False | | |
|
  • [MultipleNestedTryCatch_LastCatches - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 3.46 μs | 3.96 μs | 1.14 | 0.10 | False | | |
|
  • [ThrowAndCatchDeep - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 16.61 μs | 18.87 μs | 1.14 | 0.13 | False | | |
|
  • [CatchAndThrowOtherDeep - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 55.16 μs | 61.79 μs | 1.12 | 0.14 | False | | |
|
  • [ThrowAndCatch_ManyCatchBlocks - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 15.21 μs | 17.02 μs | 1.12 | 0.08 | False | | |
|
  • [CatchAndRethrowDeep - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 49.88 μs | 55.28 μs | 1.11 | 0.14 | False | | |
|
  • [ThrowAndCatch - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 14.91 μs | 16.46 μs | 1.10 | 0.07 | False | | |
|
  • [ThrowAndCatch_ManyCatchBlocks - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 3.63 μs | 4.00 μs | 1.10 | 0.07 | False | | |
|
  • [ThrowAndCatchDeep - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 30.89 μs | 33.52 μs | 1.09 | 0.44 | False | | |
|
  • [ThrowAndCatchWhenFinally - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 8.43 μs | 8.92 μs | 1.06 | 0.21 | False | | |

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[Test Report]()

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

```cmd
git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'Exceptions.Handling*'
```

### Exceptions.Handling.ThrowAndCatchDeepRecursive(kind: ReflectionHardware)

#### ETL Files

#### Histogram

#### JIT Disasms

### Exceptions.Handling.ThrowAndCatchDeepRecursive(kind: Software)

#### ETL Files

#### Histogram

#### JIT Disasms

### Exceptions.Handling.ThrowAndCatchDeep(kind: Software)

#### ETL Files

#### Histogram

#### JIT Disasms

### Exceptions.Handling.ThrowAndCatchWhenFinally(kind: Software)

#### ETL Files

#### Histogram

#### JIT Disasms

### Exceptions.Handling.ThrowAndCatchDeepRecursive(kind: ReflectionSoftware)

#### ETL Files

#### Histogram

#### JIT Disasms

### Exceptions.Handling.ThrowAndCatchWhen(kind: Software)

#### ETL Files

#### Histogram

#### JIT Disasms

### Exceptions.Handling.TryAndCatchDeep_CaugtAtTheTop(kind: Software)

#### ETL Files

#### Histogram

#### JIT Disasms

### Exceptions.Handling.CatchAndRethrowDeep(kind: Software)

#### ETL Files

#### Histogram

#### JIT Disasms

### Exceptions.Handling.MultipleNestedTryCatch_FirstCatches(kind: Software)

#### ETL Files

#### Histogram

#### JIT Disasms

### Exceptions.Handling.ThrowAndCatchDeepRecursive(kind: Hardware)

#### ETL Files

#### Histogram

#### JIT Disasms

### Exceptions.Handling.ThrowAndCatchFinally(kind: Software)

#### ETL Files

#### Histogram

#### JIT Disasms

### Exceptions.Handling.ThrowAndCatch(kind: Software)

#### ETL Files

#### Histogram

#### JIT Disasms

### Exceptions.Handling.CatchAndThrowOtherDeep(kind: Software)

#### ETL Files

#### Histogram

#### JIT Disasms

### Exceptions.Handling.MultipleNestedTryFinally(kind: Software)

#### ETL Files

#### Histogram

#### JIT Disasms

### Exceptions.Handling.MultipleNestedTryCatch_LastCatches(kind: Software)

#### ETL Files

#### Histogram

#### JIT Disasms

### Exceptions.Handling.ThrowAndCatchDeep(kind: Hardware)

#### ETL Files

#### Histogram

#### JIT Disasms

### Exceptions.Handling.CatchAndThrowOtherDeep(kind: Hardware)

#### ETL Files

#### Histogram

#### JIT Disasms

### Exceptions.Handling.ThrowAndCatch_ManyCatchBlocks(kind: ReflectionSoftware)

#### ETL Files

#### Histogram

#### JIT Disasms

### Exceptions.Handling.CatchAndRethrowDeep(kind: Hardware)

#### ETL Files

#### Histogram

#### JIT Disasms

### Exceptions.Handling.ThrowAndCatch(kind: ReflectionSoftware)

#### ETL Files

#### Histogram

#### JIT Disasms

### Exceptions.Handling.ThrowAndCatch_ManyCatchBlocks(kind: Software)

#### ETL Files

#### Histogram

#### JIT Disasms

### Exceptions.Handling.ThrowAndCatchDeep(kind: ReflectionHardware)

#### ETL Files

#### Histogram

#### JIT Disasms

### Exceptions.Handling.ThrowAndCatchWhenFinally(kind: Hardware)

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

[Profiling workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/profiling-workflow-dotnet-runtime.md)
[Benchmarking workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/benchmarking-workflow-dotnet-runtime.md)

---

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | azurelinux 3.0
Queue | CobaltAzureLinux
Baseline | [7da460b99b9c7e76b3060ef6da6687a008263ab9](https://github.com/dotnet/runtime/commit/7da460b99b9c7e76b3060ef6da6687a008263ab9)
Compare | [f5f5f83dd8676416636eda75d8c091c6c4f8d506](https://github.com/dotnet/runtime/commit/f5f5f83dd8676416636eda75d8c091c6c4f8d506)
Diff | [Diff](https://github.com/dotnet/runtime/compare/7da460b99b9c7e76b3060ef6da6687a008263ab9...f5f5f83dd8676416636eda75d8c091c6c4f8d506)
Configs | CompilationMode:tiered, R2RType:r2r_interpreter, RunKind:micro

### Regressions in System.Tests.Perf_Environment

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|

  • [SetEnvironmentVariable - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 754.48 ns | 856.91 ns | 1.14 | 0.08 | False | | |

![graph]()
[Test Report]()

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

```cmd
git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Tests.Perf_Environment*'
```

### System.Tests.Perf_Environment.SetEnvironmentVariable

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

[Profiling workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/profiling-workflow-dotnet-runtime.md)
[Benchmarking workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/benchmarking-workflow-dotnet-runtime.md)

Contributor guide

No contributing guide indexed for this repository

Research direction

Start with the benchmark source at src/benchmarks/micro/runtime/Exceptions/Handling.cs, especially lines 135-171, 194-243, and 380-395, then compare the baseline and compare commits in the run information. Reproduce the affected Exceptions.Handling benchmarks on arm64 AzureLinux with the listed tiered and r2r_interpreter configuration; done means the regression's cause is identified and the affected measurements no longer regress.

Written by the indexing model from the issue text.

Assessment

Tech stack
azure, csharp, linux
Domain
performance
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Quiet
Clarity
Needs clarification
Newbie friendliness
35/100

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