[Perf] Linux/x64: 6 Regressions on 10/3/2023 8:04:03 PM

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | TigerUbuntu
Baseline | [7abea9ea6ac3cde23fe1a890338e22a5a58a51b6](https://github.com/dotnet/runtime/commit/7abea9ea6ac3cde23fe1a890338e22a5a58a51b6)
Compare | [213833ea99b79a4b494b2935e1ccb10b93cd4cbc](https://github.com/dotnet/runtime/commit/213833ea99b79a4b494b2935e1ccb10b93cd4cbc)
Diff | [Diff](https://github.com/dotnet/runtime/compare/7abea9ea6ac3cde23fe1a890338e22a5a58a51b6...213833ea99b79a4b494b2935e1ccb10b93cd4cbc)
Configs | AOT:true, CompilationMode:wasm, 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>[LastIndexOfValue - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04_AOT=true_CompilationMode=wasm_RunKind=micro/System.Memory.Span(Char).LastIndexOfValue(Size%3a%2033).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Memory/Span.cs#L93-#L94>)</li><li>[📈 - ADX Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 12.65 ns | 16.91 ns | 1.34 | 0.69 | False | | |
|<ul><li>[Clear - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04_AOT=true_CompilationMode=wasm_RunKind=micro/System.Memory.Span(Char).Clear(Size%3a%20512).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Memory/Span.cs#L40-#L41>)</li><li>[📈 - ADX Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 45.92 ns | 61.98 ns | 1.35 | 0.47 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_10_2023/refs/heads/main_x64_ubuntu%2022.04_AOT%3Dtrue_CompilationMode%3Dwasm_RunKind%3Dmicro_Regression/System.Memory.Span%28Char%29_1.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_10_2023/refs/heads/main_x64_ubuntu%2022.04_AOT%3Dtrue_CompilationMode%3Dwasm_RunKind%3Dmicro_Regression/System.Memory.Span%28Char%29_2.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_10_2023/refs/heads/main_x64_ubuntu%2022.04_AOT%3Dtrue_CompilationMode%3Dwasm_RunKind%3Dmicro_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-88b4eded-efae-4ee3-be2f-496d69ef3c3ab462820caf2490186/c24eba1b-c758-451a-8885-1c053d608669.zip?sv=2021-08-06&se=2023-11-02T11%3A44%3A01Z&sr=c&sp=rl&sig=xjhap2b9T7bE9mGV1XeMgvB%2FzdPp8L65Gf1G1m6Edu4%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-227a566a-4b88-4b5a-b076-2306822f314ee534e3e41354feeac/6708a2d3-0269-4d47-b240-75b91d76fb7b.zip?sv=2021-08-06&se=2023-11-03T10%3A09%3A56Z&sr=c&sp=rl&sig=iyzZodTqZidLydOnkNaThlQT7kIAw7v2Ml%2FVDxcOxHs%3D>)
### System.Memory.Span&lt;Char&gt;.LastIndexOfValue(Size: 33)

#### 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 16.906139420888977 > 13.12798722052175.
IsChangePoint: Marked as a change because one of 10/3/2023 2:46:17 PM, 10/9/2023 8:09:24 PM falls between 10/1/2023 7:44:15 AM and 10/9/2023 8:09:24 PM.
IsRegressionStdDev: Marked as regression because -8.780844653204175 (T) = (0 -17.397390669041894) / Math.Sqrt((2.20242215468659 / (26)) + (3.853579294059306 / (22))) is less than -2.0128955989180297 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (26) + (22) - 2, .025) and -0.34642954117040464 = (12.921129652220007 - 17.397390669041894) / 12.921129652220007 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

### System.Memory.Span&lt;Char&gt;.Clear(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 61.98329918065356 > 48.053681354965164.
IsChangePoint: Marked as a change because one of 10/4/2023 6:17:44 PM, 10/9/2023 8:09:24 PM falls between 10/1/2023 7:44:15 AM and 10/9/2023 8:09:24 PM.
IsRegressionStdDev: Marked as regression because -4.259880481521262 (T) = (0 -51.44915435241042) / Math.Sqrt((5.213297678564638 / (30)) + (10.091504925580088 / (18))) is less than -2.0128955989180297 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (30) + (18) - 2, .025) and -0.07637548156945861 = (47.79851941386905 - 51.44915435241042) / 47.79851941386905 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 | x64
OS | ubuntu 22.04
Queue | TigerUbuntu
Baseline | [7abea9ea6ac3cde23fe1a890338e22a5a58a51b6](https://github.com/dotnet/runtime/commit/7abea9ea6ac3cde23fe1a890338e22a5a58a51b6)
Compare | [213833ea99b79a4b494b2935e1ccb10b93cd4cbc](https://github.com/dotnet/runtime/commit/213833ea99b79a4b494b2935e1ccb10b93cd4cbc)
Diff | [Diff](https://github.com/dotnet/runtime/compare/7abea9ea6ac3cde23fe1a890338e22a5a58a51b6...213833ea99b79a4b494b2935e1ccb10b93cd4cbc)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro


### Regressions in Microsoft.Extensions.Primitives.StringSegmentBenchmark

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[LastIndexOf - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04_AOT=true_CompilationMode=wasm_RunKind=micro/Microsoft.Extensions.Primitives.StringSegmentBenchmark.LastIndexOf.html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/Microsoft.Extensions.Primitives/StringSegmentBenchmark.cs#L78-#L79>)</li><li>[📈 - ADX Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 20.40 ns | 24.68 ns | 1.21 | 0.63 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_10_2023/refs/heads/main_x64_ubuntu%2022.04_AOT%3Dtrue_CompilationMode%3Dwasm_RunKind%3Dmicro_Regression/Microsoft.Extensions.Primitives.StringSegmentBenchmark_1.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_10_2023/refs/heads/main_x64_ubuntu%2022.04_AOT%3Dtrue_CompilationMode%3Dwasm_RunKind%3Dmicro_Regression/Microsoft.Extensions.Primitives.StringSegmentBenchmark.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 'Microsoft.Extensions.Primitives.StringSegmentBenchmark*'
```

<details>


### Payloads

[Baseline](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-88b4eded-efae-4ee3-be2f-496d69ef3c3ab462820caf2490186/c24eba1b-c758-451a-8885-1c053d608669.zip?sv=2021-08-06&se=2023-11-02T11%3A44%3A01Z&sr=c&sp=rl&sig=xjhap2b9T7bE9mGV1XeMgvB%2FzdPp8L65Gf1G1m6Edu4%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-227a566a-4b88-4b5a-b076-2306822f314ee534e3e41354feeac/6708a2d3-0269-4d47-b240-75b91d76fb7b.zip?sv=2021-08-06&se=2023-11-03T10%3A09%3A56Z&sr=c&sp=rl&sig=iyzZodTqZidLydOnkNaThlQT7kIAw7v2Ml%2FVDxcOxHs%3D>)
### Microsoft.Extensions.Primitives.StringSegmentBenchmark.LastIndexOf

#### 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 24.67640847667444 > 22.246607567011473.
IsChangePoint: Marked as a change because one of 10/3/2023 2:46:17 PM, 10/9/2023 8:09:24 PM falls between 10/1/2023 7:44:15 AM and 10/9/2023 8:09:24 PM.
IsRegressionStdDev: Marked as regression because -7.326180430486016 (T) = (0 -26.00003329075111) / Math.Sqrt((7.078649060354597 / (26)) + (6.354426420382148 / (22))) is less than -2.0128955989180297 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (26) + (22) - 2, .025) and -0.26753546910768927 = (20.51227277218083 - 26.00003329075111) / 20.51227277218083 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 | x64
OS | ubuntu 22.04
Queue | TigerUbuntu
Baseline | [7abea9ea6ac3cde23fe1a890338e22a5a58a51b6](https://github.com/dotnet/runtime/commit/7abea9ea6ac3cde23fe1a890338e22a5a58a51b6)
Compare | [213833ea99b79a4b494b2935e1ccb10b93cd4cbc](https://github.com/dotnet/runtime/commit/213833ea99b79a4b494b2935e1ccb10b93cd4cbc)
Diff | [Diff](https://github.com/dotnet/runtime/compare/7abea9ea6ac3cde23fe1a890338e22a5a58a51b6...213833ea99b79a4b494b2935e1ccb10b93cd4cbc)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro


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

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[LastIndexOfValue - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04_AOT=true_CompilationMode=wasm_RunKind=micro/System.Memory.Span(Byte).LastIndexOfValue(Size%3a%2033).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Memory/Span.cs#L93-#L94>)</li><li>[📈 - ADX Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 10.48 ns | 18.48 ns | 1.76 | 0.62 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_10_2023/refs/heads/main_x64_ubuntu%2022.04_AOT%3Dtrue_CompilationMode%3Dwasm_RunKind%3Dmicro_Regression/System.Memory.Span%28Byte%29_1.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_10_2023/refs/heads/main_x64_ubuntu%2022.04_AOT%3Dtrue_CompilationMode%3Dwasm_RunKind%3Dmicro_Regression/System.Memory.Span%28Byte%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;Byte&gt;*'
```

<details>


### Payloads

[Baseline](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-88b4eded-efae-4ee3-be2f-496d69ef3c3ab462820caf2490186/c24eba1b-c758-451a-8885-1c053d608669.zip?sv=2021-08-06&se=2023-11-02T11%3A44%3A01Z&sr=c&sp=rl&sig=xjhap2b9T7bE9mGV1XeMgvB%2FzdPp8L65Gf1G1m6Edu4%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-227a566a-4b88-4b5a-b076-2306822f314ee534e3e41354feeac/6708a2d3-0269-4d47-b240-75b91d76fb7b.zip?sv=2021-08-06&se=2023-11-03T10%3A09%3A56Z&sr=c&sp=rl&sig=iyzZodTqZidLydOnkNaThlQT7kIAw7v2Ml%2FVDxcOxHs%3D>)
### System.Memory.Span&lt;Byte&gt;.LastIndexOfValue(Size: 33)

#### 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 18.476323091316207 > 12.091420373119755.
IsChangePoint: Marked as a change because one of 10/3/2023 2:46:17 PM, 10/9/2023 8:09:24 PM falls between 10/1/2023 7:44:15 AM and 10/9/2023 8:09:24 PM.
IsRegressionStdDev: Marked as regression because -11.276291958975198 (T) = (0 -16.833534437034196) / Math.Sqrt((1.654282956726461 / (26)) + (3.26918501164675 / (22))) is less than -2.0128955989180297 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (26) + (22) - 2, .025) and -0.4463317639354326 = (11.638778084518153 - 16.833534437034196) / 11.638778084518153 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 | x64
OS | ubuntu 22.04
Queue | TigerUbuntu
Baseline | [7abea9ea6ac3cde23fe1a890338e22a5a58a51b6](https://github.com/dotnet/runtime/commit/7abea9ea6ac3cde23fe1a890338e22a5a58a51b6)
Compare | [213833ea99b79a4b494b2935e1ccb10b93cd4cbc](https://github.com/dotnet/runtime/commit/213833ea99b79a4b494b2935e1ccb10b93cd4cbc)
Diff | [Diff](https://github.com/dotnet/runtime/compare/7abea9ea6ac3cde23fe1a890338e22a5a58a51b6...213833ea99b79a4b494b2935e1ccb10b93cd4cbc)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro


### Regressions in System.IO.Tests.Perf_Path

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[GetFileNameWithoutExtension - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04_AOT=true_CompilationMode=wasm_RunKind=micro/System.IO.Tests.Perf_Path.GetFileNameWithoutExtension.html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Runtime.Extensions/Perf.Path.cs#L55-#L56>)</li><li>[📈 - ADX Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 115.32 ns | 127.08 ns | 1.10 | 0.27 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_10_2023/refs/heads/main_x64_ubuntu%2022.04_AOT%3Dtrue_CompilationMode%3Dwasm_RunKind%3Dmicro_Regression/System.IO.Tests.Perf_Path_1.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_10_2023/refs/heads/main_x64_ubuntu%2022.04_AOT%3Dtrue_CompilationMode%3Dwasm_RunKind%3Dmicro_Regression/System.IO.Tests.Perf_Path.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.IO.Tests.Perf_Path*'
```

<details>


### Payloads

[Baseline](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-88b4eded-efae-4ee3-be2f-496d69ef3c3ab462820caf2490186/c24eba1b-c758-451a-8885-1c053d608669.zip?sv=2021-08-06&se=2023-11-02T11%3A44%3A01Z&sr=c&sp=rl&sig=xjhap2b9T7bE9mGV1XeMgvB%2FzdPp8L65Gf1G1m6Edu4%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-227a566a-4b88-4b5a-b076-2306822f314ee534e3e41354feeac/6708a2d3-0269-4d47-b240-75b91d76fb7b.zip?sv=2021-08-06&se=2023-11-03T10%3A09%3A56Z&sr=c&sp=rl&sig=iyzZodTqZidLydOnkNaThlQT7kIAw7v2Ml%2FVDxcOxHs%3D>)
### System.IO.Tests.Perf_Path.GetFileNameWithoutExtension

#### 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 127.08157131881542 > 120.62450239198.
IsChangePoint: Marked as a change because one of 10/3/2023 2:46:17 PM, 10/9/2023 8:09:24 PM falls between 10/1/2023 7:44:15 AM and 10/9/2023 8:09:24 PM.
IsRegressionStdDev: Marked as regression because -13.46742380883745 (T) = (0 -127.14894946224385) / Math.Sqrt((9.194031932611797 / (26)) + (8.076843592816402 / (22))) is less than -2.0128955989180297 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (26) + (22) - 2, .025) and -0.098806133884205 = (115.71554393565401 - 127.14894946224385) / 115.71554393565401 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 | x64
OS | ubuntu 22.04
Queue | TigerUbuntu
Baseline | [7abea9ea6ac3cde23fe1a890338e22a5a58a51b6](https://github.com/dotnet/runtime/commit/7abea9ea6ac3cde23fe1a890338e22a5a58a51b6)
Compare | [213833ea99b79a4b494b2935e1ccb10b93cd4cbc](https://github.com/dotnet/runtime/commit/213833ea99b79a4b494b2935e1ccb10b93cd4cbc)
Diff | [Diff](https://github.com/dotnet/runtime/compare/7abea9ea6ac3cde23fe1a890338e22a5a58a51b6...213833ea99b79a4b494b2935e1ccb10b93cd4cbc)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro


### Regressions in System.Memory.Span&lt;Int32&gt;

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[LastIndexOfValue - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04_AOT=true_CompilationMode=wasm_RunKind=micro/System.Memory.Span(Int32).LastIndexOfValue(Size%3a%2033).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Memory/Span.cs#L93-#L94>)</li><li>[📈 - ADX Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 13.99 ns | 18.47 ns | 1.32 | 0.77 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_10_2023/refs/heads/main_x64_ubuntu%2022.04_AOT%3Dtrue_CompilationMode%3Dwasm_RunKind%3Dmicro_Regression/System.Memory.Span%28Int32%29_1.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_10_2023/refs/heads/main_x64_ubuntu%2022.04_AOT%3Dtrue_CompilationMode%3Dwasm_RunKind%3Dmicro_Regression/System.Memory.Span%28Int32%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;Int32&gt;*'
```

<details>


### Payloads

[Baseline](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-88b4eded-efae-4ee3-be2f-496d69ef3c3ab462820caf2490186/c24eba1b-c758-451a-8885-1c053d608669.zip?sv=2021-08-06&se=2023-11-02T11%3A44%3A01Z&sr=c&sp=rl&sig=xjhap2b9T7bE9mGV1XeMgvB%2FzdPp8L65Gf1G1m6Edu4%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-227a566a-4b88-4b5a-b076-2306822f314ee534e3e41354feeac/6708a2d3-0269-4d47-b240-75b91d76fb7b.zip?sv=2021-08-06&se=2023-11-03T10%3A09%3A56Z&sr=c&sp=rl&sig=iyzZodTqZidLydOnkNaThlQT7kIAw7v2Ml%2FVDxcOxHs%3D>)
### System.Memory.Span&lt;Int32&gt;.LastIndexOfValue(Size: 33)

#### 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 18.47256598045182 > 14.196659394603948.
IsChangePoint: Marked as a change because one of 10/3/2023 2:46:17 PM, 10/9/2023 8:09:24 PM falls between 10/1/2023 7:44:15 AM and 10/9/2023 8:09:24 PM.
IsRegressionStdDev: Marked as regression because -6.348743736825663 (T) = (0 -19.810480692092955) / Math.Sqrt((7.052434076108821 / (26)) + (6.637475531601061 / (22))) is less than -2.0128955989180297 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (26) + (22) - 2, .025) and -0.3202680344300552 = (15.00489307888524 - 19.810480692092955) / 15.00489307888524 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	x64
OS	ubuntu 22.04
Queue	TigerUbuntu
Baseline	7abea9ea6ac3cde23fe1a890338e22a5a58a51b6
Compare	213833ea99b79a4b494b2935e1ccb10b93cd4cbc
Diff	Diff
Configs	AOT:true, CompilationMode:wasm, RunKind:micro

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
LastIndexOfValue - Duration of single invocation 📝 - Benchmark Source 📈 - ADX Test Multi Config Graph	12.65 ns	16.91 ns	1.34	0.69	False
Clear - Duration of single invocation 📝 - Benchmark Source 📈 - ADX Test Multi Config Graph	45.92 ns	61.98 ns	1.35	0.47	False

[Perf] Linux/x64: 6 Regressions on 10/3/2023 8:04:03 PM #22942

Description

Run Information

Regressions in System.Memory.Span<Char>

Repro

Payloads

System.Memory.Span<Char>.LastIndexOfValue(Size: 33)

ETL Files

Histogram

Description of detection logic

JIT Disasms

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

ETL Files

Histogram

Description of detection logic

JIT Disasms

Docs

Run Information

Regressions in Microsoft.Extensions.Primitives.StringSegmentBenchmark

Repro

Payloads

Microsoft.Extensions.Primitives.StringSegmentBenchmark.LastIndexOf

ETL Files

Histogram

Description of detection logic

JIT Disasms

Docs

Run Information

Regressions in System.Memory.Span<Byte>

Repro

Payloads

System.Memory.Span<Byte>.LastIndexOfValue(Size: 33)

ETL Files

Histogram

Description of detection logic

JIT Disasms

Docs

Run Information

Regressions in System.IO.Tests.Perf_Path

Repro

Payloads

System.IO.Tests.Perf_Path.GetFileNameWithoutExtension

ETL Files

Histogram

Description of detection logic

JIT Disasms

Docs

Run Information

Regressions in System.Memory.Span<Int32>

Repro

Payloads

System.Memory.Span<Int32>.LastIndexOfValue(Size: 33)

ETL Files

Histogram

Description of detection logic

JIT Disasms

Docs

Metadata

Metadata

Assignees

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