[Perf] Linux/arm64: 6 Regressions on 8/8/2023 7:20:25 PM

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 20.04
Queue | AmpereUbuntu
Baseline | [e857642fd03f8a6acdf42af7d9a814e320ec8432](https://github.com/dotnet/runtime/commit/e857642fd03f8a6acdf42af7d9a814e320ec8432)
Compare | [88633ae045e7741fffa17710dc48e9032e519258](https://github.com/dotnet/runtime/commit/88633ae045e7741fffa17710dc48e9032e519258)
Diff | [Diff](https://github.com/dotnet/runtime/compare/e857642fd03f8a6acdf42af7d9a814e320ec8432...88633ae045e7741fffa17710dc48e9032e519258)
Configs | CompilationMode:tiered, RunKind:micro


### Regressions in System.Memory.Span&lt;Char&gt;

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[IndexOfValue - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_ubuntu 20.04/System.Memory.Span(Char).IndexOfValue(Size%3a%20512).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Memory/Span.cs#L78-#L79>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=H4sIAAAAAAAACoRVbU/bMBD+3l/hb0m2NKTpC1AWJOg+ME0MRrtNGkLIba6tWWJHtrO20378znkjoWUoX5y759783J1j0ORxLilfrElIoh2nCVvY95aEpTpaA43UUUIZtx6cs06cYzMWRxcyh1vbk5FVyhciSa9FBEasGUiIKo3SVOoZS4wqoho0Hu3AD/pdf9jtHc/84/FgOB72vZNh0Pd7p+99f+z7VTzg0WHbQW47Gvf640H/ZwWnSWQy+MF4JDbK6/neRRKNBl7gXwXezSb2bkEuq8wY1xAfhPdOr3rejK1AtgxixrNtaH2bZ1xnXhD4gxK/D6UyGQ2eob6BGlELpDK5pAsIWwnUKG+aPUM3jJcuK+wU5G8Muu9VQipMVZHQHPSRxAzw2mptxj+jBwNAqqWo5BqUNsLpTmlIvGtIhNx505TyD5M1lefeJx7B9mb5ncYZ2FP2B8Zk2Aucyj5dFUGLFsK/ShHBkmZx7rsUTddC6i80AVXQit88Bvsu418zyGCstGR85ZL8z+BKiUPuO29R6xILr6q7HQ262AuW23mb3IZJ3hHG6BXeEIo90M2ZQP8p9nkTfbAhSpuW+//wXWZThCgbpGmyT3vLokyq83DWuQaK9pAA16rzl2zWqCAzpNlcKQnDgvNac2km+y7vnbBoolpVMZNriqkRsi3NR2NPmue0Jy2r2kfj8L6UVX3fTtMsIKZhobE+A7Pwdi1je1ibe7DaLi6Lpcc4scsF6DTrnQi+ZKtMUs0EV3fV0JibKc6vgye4Clmcn4uNGD6vxxYPE4FtA3Im0vJUa5mCJNU7e8/37UrMdik47VrMhpxqpJ6cN/YtYlSWJFTirBIqV48J3do53jSAS945ZL574cCtG8SteUA/qRRPeJ/kJfi1/FADCoc+lFhYZDeKLeQX2MJ0hbC+4xZOi5B18Cp2qS3IwkSeBBL2C68/ZJyDbK4SwZsZS3w4UG823wLXlyYbptfEJgokAxXWq8UlW810jDv4I74vOEu78jd/dWyuHJQVonxcnH8AAAD//w==>)</li></ul> | 27.67 ns | 34.10 ns | 1.23 | 0.02 | True | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/08_17_2023/refs/heads/main_arm64_ubuntu%2020.04_Regression/System.Memory.Span%28Char%29_1.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/08_17_2023/refs/heads/main_arm64_ubuntu%2020.04_Regression/System.Memory.Span%28Char%29.html>)

### 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
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Memory.Span&lt;Char&gt;*'
```

<details>


### Payloads

[Baseline](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-7a7a4933-d3ce-4f2f-8f6f-d631da41fe64eff8992751f4a41a0/37bf2c49-ae59-4691-a899-d2deee7221b3.zip?sv=2021-08-06&se=2023-09-06T23%3A22%3A43Z&sr=c&sp=rl&sig=XOX2WI8BejKLjZTHXuRhUXUiTDtzvRZ5nLF8NhGEthk%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-e3207520-1da7-435e-9dcb-771fe0be6834dadf513f74e4fe098/58f1fcf7-88c9-44b7-8974-95dc335aa9d5.zip?sv=2021-08-06&se=2023-09-08T06%3A26%3A04Z&sr=c&sp=rl&sig=raLBFzKVxFrAGFsGgpDvL9ZQt8dEjGe%2BX8SyQX%2BOT%2Fo%3D>)
### System.Memory.Span&lt;Char&gt;.IndexOfValue(Size: 512)

#### ETL Files

#### Histogram

#### Description of detection logic
```
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsRegressionWindowed: Marked as regression because 34.09713285178929 > 29.216196220310195.
IsChangePoint: Marked as a change because one of 4/6/2023 11:23:56 PM, 8/8/2023 8:10:39 AM, 8/16/2023 6:53:02 PM falls between 8/7/2023 10:39:59 PM and 8/16/2023 6:53:02 PM.
IsRegressionStdDev: Marked as regression because -18.19892466119765 (T) = (0 -33.671609148303006) / Math.Sqrt((0.49036175073419497 / (6)) + (0.25602489480162904 / (14))) is less than -2.100922040224263 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (6) + (14) - 2, .025) and -0.20616787259466696 = (27.916188047580636 - 33.671609148303006) / 27.916188047580636 is less than -0.05.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsChangeEdgeDetector: Marked as regression because Edge Detector said so.

```
#### 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)

</details>


---


### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 20.04
Queue | AmpereUbuntu
Baseline | [e857642fd03f8a6acdf42af7d9a814e320ec8432](https://github.com/dotnet/runtime/commit/e857642fd03f8a6acdf42af7d9a814e320ec8432)
Compare | [88633ae045e7741fffa17710dc48e9032e519258](https://github.com/dotnet/runtime/commit/88633ae045e7741fffa17710dc48e9032e519258)
Diff | [Diff](https://github.com/dotnet/runtime/compare/e857642fd03f8a6acdf42af7d9a814e320ec8432...88633ae045e7741fffa17710dc48e9032e519258)
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
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[ToStringHex - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_ubuntu 20.04/System.Tests.Perf_Int32.ToStringHex(value%3a%20-2147483648).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Runtime/Perf.Int32.cs#L33-#L35>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 21.18 ns | 23.84 ns | 1.13 | 0.25 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/08_17_2023/refs/heads/main_arm64_ubuntu%2020.04_Regression/System.Tests.Perf_Int32_1.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/08_17_2023/refs/heads/main_arm64_ubuntu%2020.04_Regression/System.Tests.Perf_Int32.html>)

### 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
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Tests.Perf_Int32*'
```

<details>


### Payloads

[Baseline](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-7a7a4933-d3ce-4f2f-8f6f-d631da41fe64eff8992751f4a41a0/37bf2c49-ae59-4691-a899-d2deee7221b3.zip?sv=2021-08-06&se=2023-09-06T23%3A22%3A43Z&sr=c&sp=rl&sig=XOX2WI8BejKLjZTHXuRhUXUiTDtzvRZ5nLF8NhGEthk%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-e3207520-1da7-435e-9dcb-771fe0be6834dadf513f74e4fe098/58f1fcf7-88c9-44b7-8974-95dc335aa9d5.zip?sv=2021-08-06&se=2023-09-08T06%3A26%3A04Z&sr=c&sp=rl&sig=raLBFzKVxFrAGFsGgpDvL9ZQt8dEjGe%2BX8SyQX%2BOT%2Fo%3D>)
### System.Tests.Perf_Int32.ToStringHex(value: -2147483648)

#### ETL Files

#### Histogram

#### Description of detection logic
```
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsRegressionWindowed: Marked as regression because 23.843453200002333 > 22.486947409526284.
IsChangePoint: Marked as a change because one of 4/12/2023 8:39:35 PM, 4/25/2023 6:46:56 PM, 5/19/2023 9:46:56 PM, 8/8/2023 8:10:39 AM, 8/16/2023 6:53:02 PM falls between 8/7/2023 10:39:59 PM and 8/16/2023 6:53:02 PM.
IsRegressionStdDev: Marked as regression because -8.802195343931237 (T) = (0 -24.360574077034883) / Math.Sqrt((0.48783129688978255 / (6)) + (0.21101071458223963 / (12))) is less than -2.1199052992212764 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (6) + (12) - 2, .025) and -0.12819217995540996 = (21.592574837735267 - 24.360574077034883) / 21.592574837735267 is less than -0.05.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```
#### 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)

</details>


---


### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 20.04
Queue | AmpereUbuntu
Baseline | [e857642fd03f8a6acdf42af7d9a814e320ec8432](https://github.com/dotnet/runtime/commit/e857642fd03f8a6acdf42af7d9a814e320ec8432)
Compare | [88633ae045e7741fffa17710dc48e9032e519258](https://github.com/dotnet/runtime/commit/88633ae045e7741fffa17710dc48e9032e519258)
Diff | [Diff](https://github.com/dotnet/runtime/compare/e857642fd03f8a6acdf42af7d9a814e320ec8432...88633ae045e7741fffa17710dc48e9032e519258)
Configs | CompilationMode:tiered, RunKind:micro


### Regressions in System.Tests.Perf_DateTimeOffset

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[ToString - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_ubuntu 20.04/System.Tests.Perf_DateTimeOffset.ToString(format%3a%20%22r%22).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Runtime/Perf.DateTimeOffset.cs#L47-#L49>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 44.38 ns | 47.44 ns | 1.07 | 0.05 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/08_17_2023/refs/heads/main_arm64_ubuntu%2020.04_Regression/System.Tests.Perf_DateTimeOffset_1.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/08_17_2023/refs/heads/main_arm64_ubuntu%2020.04_Regression/System.Tests.Perf_DateTimeOffset.html>)

### 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
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Tests.Perf_DateTimeOffset*'
```

<details>


### Payloads

[Baseline](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-7a7a4933-d3ce-4f2f-8f6f-d631da41fe64eff8992751f4a41a0/37bf2c49-ae59-4691-a899-d2deee7221b3.zip?sv=2021-08-06&se=2023-09-06T23%3A22%3A43Z&sr=c&sp=rl&sig=XOX2WI8BejKLjZTHXuRhUXUiTDtzvRZ5nLF8NhGEthk%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-e3207520-1da7-435e-9dcb-771fe0be6834dadf513f74e4fe098/58f1fcf7-88c9-44b7-8974-95dc335aa9d5.zip?sv=2021-08-06&se=2023-09-08T06%3A26%3A04Z&sr=c&sp=rl&sig=raLBFzKVxFrAGFsGgpDvL9ZQt8dEjGe%2BX8SyQX%2BOT%2Fo%3D>)
### System.Tests.Perf_DateTimeOffset.ToString(format: "r")

#### ETL Files

#### Histogram

#### Description of detection logic
```
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsRegressionWindowed: Marked as regression because 47.44281585068164 > 45.75146968913372.
IsChangePoint: Marked as a change because one of 5/19/2023 4:22:12 AM, 8/8/2023 8:10:39 AM, 8/16/2023 6:53:02 PM falls between 8/7/2023 10:39:59 PM and 8/16/2023 6:53:02 PM.
IsRegressionStdDev: Marked as regression because -8.105692202865033 (T) = (0 -47.081586582009436) / Math.Sqrt((0.42581390567289124 / (6)) + (1.4052599605062253 / (14))) is less than -2.100922040224263 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (6) + (14) - 2, .025) and -0.07673303742918847 = (43.726332289776856 - 47.081586582009436) / 43.726332289776856 is less than -0.05.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```
#### 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)

</details>


---


### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 20.04
Queue | AmpereUbuntu
Baseline | [e857642fd03f8a6acdf42af7d9a814e320ec8432](https://github.com/dotnet/runtime/commit/e857642fd03f8a6acdf42af7d9a814e320ec8432)
Compare | [88633ae045e7741fffa17710dc48e9032e519258](https://github.com/dotnet/runtime/commit/88633ae045e7741fffa17710dc48e9032e519258)
Diff | [Diff](https://github.com/dotnet/runtime/compare/e857642fd03f8a6acdf42af7d9a814e320ec8432...88633ae045e7741fffa17710dc48e9032e519258)
Configs | CompilationMode:tiered, RunKind:micro


### Regressions in System.Memory.ReadOnlySpan

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[IndexOfString - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_ubuntu 20.04/System.Memory.ReadOnlySpan.IndexOfString(input%3a%20%22%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0%e3%81%a0.html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Memory/ReadOnlySpan.cs#L45-#L64>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 57.42 ns | 69.50 ns | 1.21 | 0.00 | True | | |
|<ul><li>[IndexOfString - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_ubuntu 20.04/System.Memory.ReadOnlySpan.IndexOfString(input%3a%20%22AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA.html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Memory/ReadOnlySpan.cs#L45-#L64>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=H4sIAAAAAAAACuxWTU/bQBC951eserHdOsYJIUCQKwV6oKoolKQqKkJoE0+SpfautbsmSdUf39n1BzGBcmsPxblsZt7Mzn69NwlocjuRlE8XJCLxmtOUTd1rR8JM7SyAxmonpYw7N95RK7HYnCXxUFq4szroO6V9KtLsTMRgzJqBhLjyKE2lHrPUuGKqQePQ7Ybd3Xa41+7sj8P9Qa8/CLvB4V7nINzfexeGgzCs5gMePx3bs7H9QWd30Nv9XsFpGpsKvjEei6UKOmEwTON+L+iGp93gfJkEFyBnVWWMa0iehHcOTzvBmM1BNgISxvNV5Hyd5FznQbcb9kr8NpTKtN97gIYGakwNkMrljE4hahRQo4JR/gBdMl6mrLAjkPc46XZWCZkwq4qF5qB3JFaA21Z7c/4JMxgAHrUUlV2D0sY4WisNaXAGqZDr4BKvwDlP1qOM8uAjj2F1PhtpyfjcZTzL9YC8Gb5+/9139a8LeP3++vfGJ/c0yQGf/BWODeFTyZTg43WGxnMZI0UlXsUn2bwgoUJS8F/liGFG88RyTWkaLYTUn2kKqqB5/E0ScC9z/iUHnFBZwvGJ/WdwpcUj162XqN4nDlJne9XvtVEbHL/1MtlvhFiFMEHP8DhCURPalpkxf4a6t4l+UiDKmEb6P/B/WU0xRSkYmyHbMtCIKItq3Ry1zoBiPKTAtWr9IssFOsgYad9sKYmiQgNqz7FR+kurJVEhKrWrOhnrKVRUyKbVSuWW1da0ZS1XtY1GMX9sq3SwWaZpSJiGqcb1GZiDu+uY2Ke9NoPTTHFcNEGME7dsiLzN9Z4IPmPzXFLNBFeXlYianSnGz4NP8KWwxI6LDil6aJca53Ai8NqAHIusHNVepiDN9Nrdyn0xF+b5ec21mI5ppPHoyfuN/gsxKk9TfLQ/gVA5v03pyrV4cwF88tYjk/WjBH59Qfz6HDBPJsUd7id5DH6uPvSAwkcfSVxY7G4strAP8QrTOcJ2Pb9IWkxZT17NXXqLw8JC7gQe2A/c/ohxDnKTSgTfrFhiI4l+0wlNF7ghZMn0grhEgWSgoppafLLSTCfYk33AfhPf0rr8a7tQlysPbYXJPhfvNwAAAP//>)</li></ul> | 58.25 ns | 69.51 ns | 1.19 | 0.01 | True | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/08_17_2023/refs/heads/main_arm64_ubuntu%2020.04_Regression/System.Memory.ReadOnlySpan_2.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/08_17_2023/refs/heads/main_arm64_ubuntu%2020.04_Regression/System.Memory.ReadOnlySpan.html>)

### 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
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Memory.ReadOnlySpan*'
```

<details>


### Payloads

[Baseline](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-7a7a4933-d3ce-4f2f-8f6f-d631da41fe64eff8992751f4a41a0/37bf2c49-ae59-4691-a899-d2deee7221b3.zip?sv=2021-08-06&se=2023-09-06T23%3A22%3A43Z&sr=c&sp=rl&sig=XOX2WI8BejKLjZTHXuRhUXUiTDtzvRZ5nLF8NhGEthk%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-e3207520-1da7-435e-9dcb-771fe0be6834dadf513f74e4fe098/58f1fcf7-88c9-44b7-8974-95dc335aa9d5.zip?sv=2021-08-06&se=2023-09-08T06%3A26%3A04Z&sr=c&sp=rl&sig=raLBFzKVxFrAGFsGgpDvL9ZQt8dEjGe%2BX8SyQX%2BOT%2Fo%3D>)
### System.Memory.ReadOnlySpan.IndexOfString(input: "だだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだxだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだ", value: "x", comparisonType: Ordinal)

#### ETL Files

#### Histogram

#### Description of detection logic
```
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsRegressionWindowed: Marked as regression because 69.50080772107812 > 60.331577144002786.
IsChangePoint: Marked as a change because one of 8/8/2023 8:10:39 AM, 8/16/2023 6:53:02 PM falls between 8/7/2023 10:39:59 PM and 8/16/2023 6:53:02 PM.
IsRegressionStdDev: Marked as regression because -145.34814893982872 (T) = (0 -69.51865422249324) / Math.Sqrt((0.010184047218936938 / (6)) + (0.06763045882450479 / (13))) is less than -2.109815577813699 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (6) + (13) - 2, .025) and -0.21016907105246393 = (57.44540650178245 - 69.51865422249324) / 57.44540650178245 is less than -0.05.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsChangeEdgeDetector: Marked as regression because Edge Detector said so.

```
#### JIT Disasms

### System.Memory.ReadOnlySpan.IndexOfString(input: "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAXAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA", value: "X", comparisonType: Ordinal)

#### ETL Files

#### Histogram

#### Description of detection logic
```
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsRegressionWindowed: Marked as regression because 69.50551808948008 > 60.42229249814034.
IsChangePoint: Marked as a change because one of 8/8/2023 8:10:39 AM, 8/16/2023 6:53:02 PM falls between 8/7/2023 10:39:59 PM and 8/16/2023 6:53:02 PM.
IsRegressionStdDev: Marked as regression because -75.57129858597224 (T) = (0 -69.47615295846397) / Math.Sqrt((0.14900991017497361 / (6)) + (0.0027130841379520753 / (14))) is less than -2.100922040224263 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (6) + (14) - 2, .025) and -0.20785225995584988 = (57.520406478358126 - 69.47615295846397) / 57.520406478358126 is less than -0.05.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsChangeEdgeDetector: Marked as regression because Edge Detector said so.

```
#### 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)

</details>


---


### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 20.04
Queue | AmpereUbuntu
Baseline | [e857642fd03f8a6acdf42af7d9a814e320ec8432](https://github.com/dotnet/runtime/commit/e857642fd03f8a6acdf42af7d9a814e320ec8432)
Compare | [88633ae045e7741fffa17710dc48e9032e519258](https://github.com/dotnet/runtime/commit/88633ae045e7741fffa17710dc48e9032e519258)
Diff | [Diff](https://github.com/dotnet/runtime/compare/e857642fd03f8a6acdf42af7d9a814e320ec8432...88633ae045e7741fffa17710dc48e9032e519258)
Configs | CompilationMode:tiered, RunKind:micro


### Regressions 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
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[Count - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_ubuntu 20.04/System.Text.RegularExpressions.Tests.Perf_Regex_Industry_RustLang_Sherlock.Count(Pattern%3a%20%22%5c%5cb%5c%5cw%2bn%5c%5cb%22%2c%20Options%3a%20NonBacktracking).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Text.RegularExpressions/Perf.Regex.Industry.cs#L191-#L192>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 8.22 ms | 10.92 ms | 1.33 | 0.07 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/08_17_2023/refs/heads/main_arm64_ubuntu%2020.04_Regression/System.Text.RegularExpressions.Tests.Perf_Regex_Industry_RustLang_Sherlock_1.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/08_17_2023/refs/heads/main_arm64_ubuntu%2020.04_Regression/System.Text.RegularExpressions.Tests.Perf_Regex_Industry_RustLang_Sherlock.html>)

### 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
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Text.RegularExpressions.Tests.Perf_Regex_Industry_RustLang_Sherlock*'
```

<details>


### Payloads

[Baseline](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-7a7a4933-d3ce-4f2f-8f6f-d631da41fe64eff8992751f4a41a0/37bf2c49-ae59-4691-a899-d2deee7221b3.zip?sv=2021-08-06&se=2023-09-06T23%3A22%3A43Z&sr=c&sp=rl&sig=XOX2WI8BejKLjZTHXuRhUXUiTDtzvRZ5nLF8NhGEthk%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-e3207520-1da7-435e-9dcb-771fe0be6834dadf513f74e4fe098/58f1fcf7-88c9-44b7-8974-95dc335aa9d5.zip?sv=2021-08-06&se=2023-09-08T06%3A26%3A04Z&sr=c&sp=rl&sig=raLBFzKVxFrAGFsGgpDvL9ZQt8dEjGe%2BX8SyQX%2BOT%2Fo%3D>)
### System.Text.RegularExpressions.Tests.Perf_Regex_Industry_RustLang_Sherlock.Count(Pattern: "\\b\\w+n\\b", Options: NonBacktracking)

#### ETL Files

#### Histogram

#### Description of detection logic
```
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsRegressionWindowed: Marked as regression because 10.9249862 > 8.481155414752688.
IsChangePoint: Marked as a change because one of 4/12/2023 8:39:35 PM, 4/25/2023 6:46:56 PM, 8/8/2023 8:10:39 AM, 8/16/2023 6:53:02 PM falls between 8/7/2023 10:39:59 PM and 8/16/2023 6:53:02 PM.
IsRegressionStdDev: Marked as regression because -53.62409757774009 (T) = (0 -10973422.664423078) / Math.Sqrt((16395116994.142904 / (6)) + (3350547550.2124906 / (13))) is less than -2.109815577813699 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (6) + (13) - 2, .025) and -0.3646694629921251 = (8041084.645041552 - 10973422.664423078) / 8041084.645041552 is less than -0.05.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```
#### 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)

</details>

Name	Value
Architecture	arm64
OS	ubuntu 20.04
Queue	AmpereUbuntu
Baseline	e857642fd03f8a6acdf42af7d9a814e320ec8432
Compare	88633ae045e7741fffa17710dc48e9032e519258
Diff	Diff
Configs	CompilationMode:tiered, RunKind:micro

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
IndexOfString - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	57.42 ns	69.50 ns	1.21	0.00	True
IndexOfString - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	58.25 ns	69.51 ns	1.19	0.01	True

[Perf] Linux/arm64: 6 Regressions on 8/8/2023 7:20:25 PM #20608

Description

Run Information

Regressions in System.Memory.Span<Char>

Repro

Payloads

System.Memory.Span<Char>.IndexOfValue(Size: 512)

ETL Files

Histogram

Description of detection logic

JIT Disasms

Docs

Run Information

Regressions in System.Tests.Perf_Int32

Repro

Payloads

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

ETL Files

Histogram

Description of detection logic

JIT Disasms

Docs

Run Information

Regressions in System.Tests.Perf_DateTimeOffset

Repro

Payloads

System.Tests.Perf_DateTimeOffset.ToString(format: "r")

ETL Files

Histogram

Description of detection logic

JIT Disasms

Docs

Run Information

Regressions in System.Memory.ReadOnlySpan

Repro

Payloads

ETL Files

Histogram

Description of detection logic

JIT Disasms

ETL Files

Histogram

Description of detection logic

JIT Disasms

Docs

Run Information

Regressions in System.Text.RegularExpressions.Tests.Perf_Regex_Industry_RustLang_Sherlock

Repro

Payloads

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

ETL Files

Histogram

Description of detection logic

JIT Disasms

Docs

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Issue actions