dotnet / dotnet/perf-autofiling-issues

[Perf] Windows/x86: 340 Regressions on 2/28/2026 3:14:25 AM +00:00

Open
#69,519 9 comments 0 reactions 0 assignees View on GitHub
arch-x86 branch-refs/heads/main kind-micro os-windows perf-regression runtime-coreclr untriaged
Dominant language
No language data
Stars
10
Forks
8
PR metrics pending

Description

### Run Information

Name | Value
-- | --
Architecture | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [371aca3a6c78a203aa32a0bd4da84e6b8da5ba63](https://github.com/dotnet/runtime/commit/371aca3a6c78a203aa32a0bd4da84e6b8da5ba63)
Compare | [1c94b86de4d8dd06420902131844566d0aa84342](https://github.com/dotnet/runtime/commit/1c94b86de4d8dd06420902131844566d0aa84342)
Diff | [Diff](https://github.com/dotnet/runtime/compare/371aca3a6c78a203aa32a0bd4da84e6b8da5ba63...1c94b86de4d8dd06420902131844566d0aa84342)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Numerics.Tests.Perf_BigInteger

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

  • [Multiply - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 4.84 ns | 5.99 ns | 1.24 | 0.02 | False | | |
|
  • [ToStringX - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 222.60 ns | 238.40 ns | 1.07 | 0.02 | False | | |
|
  • [Ctor_ByteArray - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 7.12 ns | 8.27 ns | 1.16 | 0.05 | False | | |
|
  • [ToByteArray - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 7.64 ns | 8.73 ns | 1.14 | 0.20 | False | | |
|
  • [Add - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 2.30 ΞΌs | 2.46 ΞΌs | 1.07 | 0.00 | False | | |
|
  • [Equals - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 3.74 ns | 4.96 ns | 1.32 | 0.11 | False | | |
|
  • [Equals - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 2.46 ns | 3.98 ns | 1.61 | 0.35 | False | | |
|
  • [Multiply - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 4.83 ns | 5.99 ns | 1.24 | 0.02 | False | | |
|
  • [GreatestCommonDivisor - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 19.98 ns | 21.13 ns | 1.06 | 0.02 | False | | |
|
  • [Divide - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 6.47 ns | 7.61 ns | 1.18 | 0.01 | False | | |
|
  • [Equals - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 2.66 ns | 3.95 ns | 1.49 | 0.11 | False | | |

[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.Numerics.Tests.Perf_BigInteger*'
```

### System.Numerics.Tests.Perf_BigInteger.Multiply(arguments: 16,8 bits)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_BigInteger.ToStringX(numberString: 12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_BigInteger.Ctor_ByteArray(numberString: -2147483648)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_BigInteger.ToByteArray(numberString: -2147483648)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_BigInteger.Add(arguments: 65536,65536 bits)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_BigInteger.Equals(arguments: 259 bytes, DiffMiddleByte)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_BigInteger.Equals(arguments: 67 bytes, Same)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_BigInteger.Multiply(arguments: 16,16 bits)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_BigInteger.GreatestCommonDivisor(arguments: 16,16 bits)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_BigInteger.Divide(arguments: 16,8 bits)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_BigInteger.Equals(arguments: 67 bytes, DiffLastByte)

#### 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 | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [371aca3a6c78a203aa32a0bd4da84e6b8da5ba63](https://github.com/dotnet/runtime/commit/371aca3a6c78a203aa32a0bd4da84e6b8da5ba63)
Compare | [1c94b86de4d8dd06420902131844566d0aa84342](https://github.com/dotnet/runtime/commit/1c94b86de4d8dd06420902131844566d0aa84342)
Diff | [Diff](https://github.com/dotnet/runtime/compare/371aca3a6c78a203aa32a0bd4da84e6b8da5ba63...1c94b86de4d8dd06420902131844566d0aa84342)
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
-- | -- | -- | -- | -- | -- | -- | -- | --
|

  • [TryParse - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 4.31 ns | 5.47 ns | 1.27 | 0.02 | False | | |
|
  • [ParseHex - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 4.03 ns | 5.18 ns | 1.29 | 0.04 | False | | |
|
  • [Parse - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 6.47 ns | 7.61 ns | 1.18 | 0.03 | False | | |
|
  • [Parse - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 9.99 ns | 11.14 ns | 1.12 | 0.29 | False | | |
|
  • [ToString - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 10.74 ns | 11.82 ns | 1.10 | 0.03 | False | | |
|
  • [TryFormat - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 4.59 ns | 5.68 ns | 1.24 | 0.13 | False | | |
|
  • [TryFormat - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 4.41 ns | 5.56 ns | 1.26 | 0.02 | False | | |
|
  • [ToStringHex - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 6.45 ns | 7.60 ns | 1.18 | 0.02 | False | | |
|
  • [ParseSpan - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 4.31 ns | 5.46 ns | 1.27 | 0.17 | False | | |
|
  • [Parse - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 4.32 ns | 5.45 ns | 1.26 | 0.06 | False | | |
|
  • [ToString - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 0.29 ns | 1.42 ns | 4.94 | 0.65 | False | | |
|
  • [CopySign - Duration of single invocation]()
  • [ADX - Test Multi Config Graph]()
| 0.22 ns | 1.37 ns | 6.22 | 0.09 | False | | |
|
  • [ParseSpan - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 9.93 ns | 11.07 ns | 1.12 | 0.30 | False | | |
|
  • [TryParse - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 6.47 ns | 7.62 ns | 1.18 | 0.02 | False | | |
|
  • [TryFormat - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 2.93 ns | 4.08 ns | 1.39 | 0.05 | False | | |
|
  • [TryParse - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 9.93 ns | 11.06 ns | 1.11 | 0.31 | False | | |
|
  • [ParseSpan - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 10.73 ns | 11.88 ns | 1.11 | 0.22 | False | | |
|
  • [TryParseSpan - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 10.79 ns | 11.83 ns | 1.10 | 0.30 | False | | |
|
  • [ParseSpan - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 6.46 ns | 7.62 ns | 1.18 | 0.03 | False | | |

[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_Int32*'
```

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

#### ETL Files

#### Histogram

#### JIT Disasms

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

#### ETL Files

#### Histogram

#### JIT Disasms

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

#### ETL Files

#### Histogram

#### JIT Disasms

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

#### ETL Files

#### Histogram

#### JIT Disasms

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

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Int32.TryFormat(value: 4)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Int32.TryFormat(value: 2147483647)

#### ETL Files

#### Histogram

#### JIT Disasms

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

#### ETL Files

#### Histogram

#### JIT Disasms

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

#### ETL Files

#### Histogram

#### JIT Disasms

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

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Int32.ToString(value: 4)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Int32.CopySign(value: 1, sign: -1)

#### ETL Files

#### Histogram

#### JIT Disasms

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

#### ETL Files

#### Histogram

#### JIT Disasms

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

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Int32.TryFormat(value: 12345)

#### ETL Files

#### Histogram

#### JIT Disasms

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

#### ETL Files

#### Histogram

#### JIT Disasms

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

#### ETL Files

#### Histogram

#### JIT Disasms

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

#### ETL Files

#### Histogram

#### JIT Disasms

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

#### 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 | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [371aca3a6c78a203aa32a0bd4da84e6b8da5ba63](https://github.com/dotnet/runtime/commit/371aca3a6c78a203aa32a0bd4da84e6b8da5ba63)
Compare | [1c94b86de4d8dd06420902131844566d0aa84342](https://github.com/dotnet/runtime/commit/1c94b86de4d8dd06420902131844566d0aa84342)
Diff | [Diff](https://github.com/dotnet/runtime/compare/371aca3a6c78a203aa32a0bd4da84e6b8da5ba63...1c94b86de4d8dd06420902131844566d0aa84342)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Memory.Constructors_ValueTypesOnly<Byte>

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

  • [ReadOnlyFromPointerLength - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 0.02 ns | 1.13 ns | 66.59 | 0.72 | False | | |
|
  • [SpanFromPointerLength - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 0.02 ns | 1.15 ns | 68.02 | 0.73 | False | | |

[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.Memory.Constructors_ValueTypesOnly*'
```

### System.Memory.Constructors_ValueTypesOnly<Byte>.ReadOnlyFromPointerLength

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Constructors_ValueTypesOnly<Byte>.SpanFromPointerLength

#### 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 | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [371aca3a6c78a203aa32a0bd4da84e6b8da5ba63](https://github.com/dotnet/runtime/commit/371aca3a6c78a203aa32a0bd4da84e6b8da5ba63)
Compare | [1c94b86de4d8dd06420902131844566d0aa84342](https://github.com/dotnet/runtime/commit/1c94b86de4d8dd06420902131844566d0aa84342)
Diff | [Diff](https://github.com/dotnet/runtime/compare/371aca3a6c78a203aa32a0bd4da84e6b8da5ba63...1c94b86de4d8dd06420902131844566d0aa84342)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in PerfLabTests.CastingPerf

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

  • [CheckArrayIsNonvariantGenericInterfaceNo - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 0.00 ns | 1.40 ns | ∞ | 0.58 | False | | |
|
  • [CheckArrayIsVariantGenericInterfaceNo - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 0.01 ns | 1.42 ns | 113.54 | 0.61 | False | | |
|
  • [CheckArrayIsNonvariantGenericInterface - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 0.27 ns | 1.42 ns | 5.26 | 0.46 | False | | |
|
  • [CheckArrayIsArrayByVariance - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 0.01 ns | 1.41 ns | 96.92 | 0.58 | False | | |
|
  • [CheckArrayIsVariantGenericInterfaceReflection - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 0.00 ns | 1.15 ns | 19669.07 | 0.91 | False | | |
|
  • [CheckListIsVariantGenericInterface - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 0.01 ns | 1.42 ns | 96.63 | 0.54 | False | | |

[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 'PerfLabTests.CastingPerf*'
```

### PerfLabTests.CastingPerf.CheckArrayIsNonvariantGenericInterfaceNo

#### ETL Files

#### Histogram

#### JIT Disasms

### PerfLabTests.CastingPerf.CheckArrayIsVariantGenericInterfaceNo

#### ETL Files

#### Histogram

#### JIT Disasms

### PerfLabTests.CastingPerf.CheckArrayIsNonvariantGenericInterface

#### ETL Files

#### Histogram

#### JIT Disasms

### PerfLabTests.CastingPerf.CheckArrayIsArrayByVariance

#### ETL Files

#### Histogram

#### JIT Disasms

### PerfLabTests.CastingPerf.CheckArrayIsVariantGenericInterfaceReflection

#### ETL Files

#### Histogram

#### JIT Disasms

### PerfLabTests.CastingPerf.CheckListIsVariantGenericInterface

#### 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 linked performance reports and the benchmark source at src/benchmarks/micro/libraries/System.Runtime.Numerics/Perf.BigInteger.cs, especially the referenced lines. Compare the baseline and test commits for the Windows x86 tiered microbenchmark run, then determine which reported regressions are actionable. Done means identifying and addressing the regression cause with supporting benchmark results.

Written by the indexing model from the issue text.

Assessment

Tech stack
csharp
Domain
performance
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

Get new issues in your inbox

A short digest of beginner-friendly GitHub issues.