[Perf] Linux/x64: 8 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 | 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_CompilationMode=wasm_RunKind=micro/System.Memory.Span(Int32).LastIndexOfValue(Size%3a%204).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> | 48.80 ns | 62.21 ns | 1.27 | 0.51 | False | | |
|<ul><li>[LastIndexOfValue - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04_CompilationMode=wasm_RunKind=micro/System.Memory.Span(Int32).LastIndexOfValue(Size%3a%20512).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> | 324.74 ns | 834.60 ns | 2.57 | 0.18 | True | | |
|<ul><li>[LastIndexOfValue - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04_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> | 62.66 ns | 116.96 ns | 1.87 | 0.41 | True | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_12_2023/refs/heads/main_x64_ubuntu%2022.04_CompilationMode%3Dwasm_RunKind%3Dmicro_Regression/System.Memory.Span%28Int32%29_1.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_12_2023/refs/heads/main_x64_ubuntu%2022.04_CompilationMode%3Dwasm_RunKind%3Dmicro_Regression/System.Memory.Span%28Int32%29_2.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_12_2023/refs/heads/main_x64_ubuntu%2022.04_CompilationMode%3Dwasm_RunKind%3Dmicro_Regression/System.Memory.Span%28Int32%29_3.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_12_2023/refs/heads/main_x64_ubuntu%2022.04_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-ec522713-8f5c-4305-9d30-d51a71c0bc00317387569b8408a8a/9a20541b-00e8-4724-9195-63d6c3bc7dcc.zip?sv=2021-08-06&se=2023-11-02T11%3A43%3A37Z&sr=c&sp=rl&sig=3QV0UeLjztjBqSPcZc7V6DRaJhniGenovohT5AYfwTc%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-cc64930d-578e-428e-83dd-66cd4eb645220ede7bbbc9e4fd693/ec01ce23-65f3-48d6-acd1-624579282824.zip?sv=2021-08-06&se=2023-11-03T10%3A09%3A28Z&sr=c&sp=rl&sig=qQYXgR4oe%2FdtgtScZ4AYaWlIC8LKynkH7X4w%2BV56vDM%3D>)
### System.Memory.Span&lt;Int32&gt;.LastIndexOfValue(Size: 4)

#### 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 62.21245951490272 > 47.056187355942384.
IsChangePoint: Marked as a change because one of 10/3/2023 2:46:17 PM, 10/11/2023 8:44:35 PM falls between 10/3/2023 8:20:31 AM and 10/11/2023 8:44:35 PM.
IsRegressionStdDev: Marked as regression because -11.517203943512378 (T) = (0 -67.06888049787791) / Math.Sqrt((15.685222885597295 / (16)) + (80.9144934251401 / (32))) is less than -2.0128955989180297 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (16) + (32) - 2, .025) and -0.4742106596022531 = (45.49477380388317 - 67.06888049787791) / 45.49477380388317 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;Int32&gt;.LastIndexOfValue(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 834.5961217595146 > 340.60399418386396.
IsChangePoint: Marked as a change because one of 10/3/2023 2:46:17 PM, 10/11/2023 8:44:35 PM falls between 10/3/2023 8:20:31 AM and 10/11/2023 8:44:35 PM.
IsRegressionStdDev: Marked as regression because -383.18156729121677 (T) = (0 -834.7963058554359) / Math.Sqrt((21.039955655014598 / (16)) + (14.343417527725343 / (32))) is less than -2.0128955989180297 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (16) + (32) - 2, .025) and -1.5608631260369852 = (325.9823992027676 - 834.7963058554359) / 325.9823992027676 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.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 116.96123960580458 > 65.96097703408634.
IsChangePoint: Marked as a change because one of 10/3/2023 2:46:17 PM, 10/11/2023 8:44:35 PM falls between 10/3/2023 8:20:31 AM and 10/11/2023 8:44:35 PM.
IsRegressionStdDev: Marked as regression because -37.70223913220826 (T) = (0 -117.46471030834309) / Math.Sqrt((17.826307038038593 / (16)) + (26.90703525793048 / (32))) is less than -2.0128955989180297 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (16) + (32) - 2, .025) and -0.8141522490944836 = (64.74909168564791 - 117.46471030834309) / 64.74909168564791 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 | 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 | 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_CompilationMode=wasm_RunKind=micro/System.Memory.Span(Char).LastIndexOfValue(Size%3a%20512).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> | 171.35 ns | 755.45 ns | 4.41 | 0.24 | True | | |
|<ul><li>[LastIndexOfValue - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04_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> | 53.44 ns | 146.88 ns | 2.75 | 0.46 | True | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_12_2023/refs/heads/main_x64_ubuntu%2022.04_CompilationMode%3Dwasm_RunKind%3Dmicro_Regression/System.Memory.Span%28Char%29_1.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_12_2023/refs/heads/main_x64_ubuntu%2022.04_CompilationMode%3Dwasm_RunKind%3Dmicro_Regression/System.Memory.Span%28Char%29_2.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_12_2023/refs/heads/main_x64_ubuntu%2022.04_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-ec522713-8f5c-4305-9d30-d51a71c0bc00317387569b8408a8a/9a20541b-00e8-4724-9195-63d6c3bc7dcc.zip?sv=2021-08-06&se=2023-11-02T11%3A43%3A37Z&sr=c&sp=rl&sig=3QV0UeLjztjBqSPcZc7V6DRaJhniGenovohT5AYfwTc%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-cc64930d-578e-428e-83dd-66cd4eb645220ede7bbbc9e4fd693/ec01ce23-65f3-48d6-acd1-624579282824.zip?sv=2021-08-06&se=2023-11-03T10%3A09%3A28Z&sr=c&sp=rl&sig=qQYXgR4oe%2FdtgtScZ4AYaWlIC8LKynkH7X4w%2BV56vDM%3D>)
### System.Memory.Span&lt;Char&gt;.LastIndexOfValue(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 755.4493166241348 > 180.9260219075908.
IsChangePoint: Marked as a change because one of 10/3/2023 2:46:17 PM, 10/11/2023 8:44:35 PM falls between 10/3/2023 8:20:31 AM and 10/11/2023 8:44:35 PM.
IsRegressionStdDev: Marked as regression because -407.41023938593173 (T) = (0 -750.892251767135) / Math.Sqrt((13.960469529005765 / (16)) + (36.23773677660978 / (32))) is less than -2.0128955989180297 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (16) + (32) - 2, .025) and -3.315141337374475 = (174.0133620337014 - 750.892251767135) / 174.0133620337014 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.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 146.87737439915173 > 59.902611614972415.
IsChangePoint: Marked as a change because one of 10/3/2023 2:46:17 PM, 10/11/2023 8:44:35 PM falls between 10/3/2023 8:20:31 AM and 10/11/2023 8:44:35 PM.
IsRegressionStdDev: Marked as regression because -37.35632003877844 (T) = (0 -123.73763311274897) / Math.Sqrt((7.908648475854435 / (16)) + (87.08843414096359 / (32))) is less than -2.0128955989180297 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (16) + (32) - 2, .025) and -1.1804832540942571 = (56.747802525155315 - 123.73763311274897) / 56.747802525155315 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 | 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 | 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_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> | 54.77 ns | 76.00 ns | 1.39 | 0.57 | True | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_12_2023/refs/heads/main_x64_ubuntu%2022.04_CompilationMode%3Dwasm_RunKind%3Dmicro_Regression/Microsoft.Extensions.Primitives.StringSegmentBenchmark_1.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_12_2023/refs/heads/main_x64_ubuntu%2022.04_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-ec522713-8f5c-4305-9d30-d51a71c0bc00317387569b8408a8a/9a20541b-00e8-4724-9195-63d6c3bc7dcc.zip?sv=2021-08-06&se=2023-11-02T11%3A43%3A37Z&sr=c&sp=rl&sig=3QV0UeLjztjBqSPcZc7V6DRaJhniGenovohT5AYfwTc%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-cc64930d-578e-428e-83dd-66cd4eb645220ede7bbbc9e4fd693/ec01ce23-65f3-48d6-acd1-624579282824.zip?sv=2021-08-06&se=2023-11-03T10%3A09%3A28Z&sr=c&sp=rl&sig=qQYXgR4oe%2FdtgtScZ4AYaWlIC8LKynkH7X4w%2BV56vDM%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 76.00273375991067 > 53.0270642362473.
IsChangePoint: Marked as a change because one of 10/3/2023 2:46:17 PM, 10/11/2023 8:44:35 PM falls between 10/3/2023 8:20:31 AM and 10/11/2023 8:44:35 PM.
IsRegressionStdDev: Marked as regression because -31.00260259086538 (T) = (0 -78.06162000890457) / Math.Sqrt((6.219118713185449 / (16)) + (10.832915994575718 / (32))) is less than -2.0128955989180297 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (16) + (32) - 2, .025) and -0.5121361902592106 = (51.623405690411545 - 78.06162000890457) / 51.623405690411545 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 | 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 | CompilationMode:wasm, RunKind:micro


### Regressions in System.Collections.ContainsTrue&lt;Int32&gt;

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[Stack - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04_CompilationMode=wasm_RunKind=micro/System.Collections.ContainsTrue(Int32).Stack(Size%3a%20512).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Collections/Contains/ContainsTrue.cs#L164-#L173>)</li><li>[📈 - ADX Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 233.46 μs | 477.82 μs | 2.05 | 0.28 | True | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_12_2023/refs/heads/main_x64_ubuntu%2022.04_CompilationMode%3Dwasm_RunKind%3Dmicro_Regression/System.Collections.ContainsTrue%28Int32%29_1.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_12_2023/refs/heads/main_x64_ubuntu%2022.04_CompilationMode%3Dwasm_RunKind%3Dmicro_Regression/System.Collections.ContainsTrue%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.Collections.ContainsTrue&lt;Int32&gt;*'
```

<details>


### Payloads

[Baseline](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-ec522713-8f5c-4305-9d30-d51a71c0bc00317387569b8408a8a/9a20541b-00e8-4724-9195-63d6c3bc7dcc.zip?sv=2021-08-06&se=2023-11-02T11%3A43%3A37Z&sr=c&sp=rl&sig=3QV0UeLjztjBqSPcZc7V6DRaJhniGenovohT5AYfwTc%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-cc64930d-578e-428e-83dd-66cd4eb645220ede7bbbc9e4fd693/ec01ce23-65f3-48d6-acd1-624579282824.zip?sv=2021-08-06&se=2023-11-03T10%3A09%3A28Z&sr=c&sp=rl&sig=qQYXgR4oe%2FdtgtScZ4AYaWlIC8LKynkH7X4w%2BV56vDM%3D>)
### System.Collections.ContainsTrue&lt;Int32&gt;.Stack(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 477.81588271103897 > 222.47363675999634.
IsChangePoint: Marked as a change because one of 10/3/2023 2:46:17 PM, 10/11/2023 8:44:35 PM falls between 10/3/2023 8:20:31 AM and 10/11/2023 8:44:35 PM.
IsRegressionStdDev: Marked as regression because -35.128449078094015 (T) = (0 -492998.91439779353) / Math.Sqrt((112911988.69375414 / (16)) + (1760002391.1540992 / (32))) is less than -2.0128955989180297 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (16) + (32) - 2, .025) and -1.27955350540565 = (216269.94638586632 - 492998.91439779353) / 216269.94638586632 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 | 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 | CompilationMode:wasm, RunKind:micro


### Regressions in System.Collections.ContainsFalse&lt;Int32&gt;

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[Stack - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04_CompilationMode=wasm_RunKind=micro/System.Collections.ContainsFalse(Int32).Stack(Size%3a%20512).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Collections/Contains/ContainsFalse.cs#L139-#L148>)</li><li>[📈 - ADX Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 343.85 μs | 871.43 μs | 2.53 | 0.19 | True | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_12_2023/refs/heads/main_x64_ubuntu%2022.04_CompilationMode%3Dwasm_RunKind%3Dmicro_Regression/System.Collections.ContainsFalse%28Int32%29_1.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_12_2023/refs/heads/main_x64_ubuntu%2022.04_CompilationMode%3Dwasm_RunKind%3Dmicro_Regression/System.Collections.ContainsFalse%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.Collections.ContainsFalse&lt;Int32&gt;*'
```

<details>


### Payloads

[Baseline](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-ec522713-8f5c-4305-9d30-d51a71c0bc00317387569b8408a8a/9a20541b-00e8-4724-9195-63d6c3bc7dcc.zip?sv=2021-08-06&se=2023-11-02T11%3A43%3A37Z&sr=c&sp=rl&sig=3QV0UeLjztjBqSPcZc7V6DRaJhniGenovohT5AYfwTc%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-cc64930d-578e-428e-83dd-66cd4eb645220ede7bbbc9e4fd693/ec01ce23-65f3-48d6-acd1-624579282824.zip?sv=2021-08-06&se=2023-11-03T10%3A09%3A28Z&sr=c&sp=rl&sig=qQYXgR4oe%2FdtgtScZ4AYaWlIC8LKynkH7X4w%2BV56vDM%3D>)
### System.Collections.ContainsFalse&lt;Int32&gt;.Stack(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 871.4300208333335 > 359.62652188179356.
IsChangePoint: Marked as a change because one of 10/3/2023 2:46:17 PM, 10/11/2023 8:44:35 PM falls between 10/3/2023 8:20:31 AM and 10/11/2023 8:44:35 PM.
IsRegressionStdDev: Marked as regression because -23.41781998345187 (T) = (0 -870645.908893578) / Math.Sqrt((7060978865.391527 / (16)) + (11370279.890512314 / (32))) is less than -2.0128955989180297 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (16) + (32) - 2, .025) and -1.3002521106064553 = (378500.210859076 - 870645.908893578) / 378500.210859076 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>

Name	Value
Architecture	x64
OS	ubuntu 22.04
Queue	TigerUbuntu
Baseline	7abea9ea6ac3cde23fe1a890338e22a5a58a51b6
Compare	213833ea99b79a4b494b2935e1ccb10b93cd4cbc
Diff	Diff
Configs	CompilationMode:wasm, RunKind:micro

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector
LastIndexOfValue - Duration of single invocation 📝 - Benchmark Source 📈 - ADX Test Multi Config Graph	48.80 ns	62.21 ns	1.27	0.51	False
LastIndexOfValue - Duration of single invocation 📝 - Benchmark Source 📈 - ADX Test Multi Config Graph	324.74 ns	834.60 ns	2.57	0.18	True
LastIndexOfValue - Duration of single invocation 📝 - Benchmark Source 📈 - ADX Test Multi Config Graph	62.66 ns	116.96 ns	1.87	0.41	True

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	171.35 ns	755.45 ns	4.41	0.24	True
LastIndexOfValue - Duration of single invocation 📝 - Benchmark Source 📈 - ADX Test Multi Config Graph	53.44 ns	146.88 ns	2.75	0.46	True

[Perf] Linux/x64: 8 Regressions on 10/3/2023 8:04:03 PM #23013

Description

Run Information

Regressions in System.Memory.Span<Int32>

Repro

Payloads

System.Memory.Span<Int32>.LastIndexOfValue(Size: 4)

ETL Files

Histogram

Description of detection logic

JIT Disasms

System.Memory.Span<Int32>.LastIndexOfValue(Size: 512)

ETL Files

Histogram

Description of detection logic

JIT Disasms

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

ETL Files

Histogram

Description of detection logic

JIT Disasms

Docs

Run Information

Regressions in System.Memory.Span<Char>

Repro

Payloads

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

ETL Files

Histogram

Description of detection logic

JIT Disasms

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

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.Collections.ContainsTrue<Int32>

Repro

Payloads

System.Collections.ContainsTrue<Int32>.Stack(Size: 512)

ETL Files

Histogram

Description of detection logic

JIT Disasms

Docs

Run Information

Regressions in System.Collections.ContainsFalse<Int32>

Repro

Payloads

System.Collections.ContainsFalse<Int32>.Stack(Size: 512)

ETL Files

Histogram

Description of detection logic

JIT Disasms

Docs

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