[Perf] Linux/x64: 22 Regressions on 1/19/2023 7:53:02 PM

### Run Information

Architecture | x64
-- | --
OS | ubuntu 18.04
Baseline | [19fc478d67c2fc55e62b50676935f903a77f5a4d](https://github.com/dotnet/runtime/commit/19fc478d67c2fc55e62b50676935f903a77f5a4d)
Compare | [8300e381e41bdf013c5dc697e3e9c15f68e8f249](https://github.com/dotnet/runtime/commit/8300e381e41bdf013c5dc697e3e9c15f68e8f249)
Diff | [Diff](https://github.com/dotnet/runtime/compare/19fc478d67c2fc55e62b50676935f903a77f5a4d...8300e381e41bdf013c5dc697e3e9c15f68e8f249)


### Regressions in System.Buffers.Tests.ReadOnlySequenceTests&lt;Char&gt;

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio | Baseline ETL | Compare ETL
-- | -- | -- | -- | -- | -- | -- | -- | -- | -- | --
[IterateForEachArray - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04_AOT=true_CompliationMode=wasm_RunKind=micro/System.Buffers.Tests.ReadOnlySequenceTests(Char).IterateForEachArray.html>) | 122.34 ns | 168.58 ns | 1.38 | 0.48 | False | | |
[IterateGetPositionTenSegments - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04_AOT=true_CompliationMode=wasm_RunKind=micro/System.Buffers.Tests.ReadOnlySequenceTests(Char).IterateGetPositionTenSegments.html>) | 567.79 ns | 649.16 ns | 1.14 | 0.30 | False | | |
[SliceTenSegments - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04_AOT=true_CompliationMode=wasm_RunKind=micro/System.Buffers.Tests.ReadOnlySequenceTests(Char).SliceTenSegments.html>) | 116.74 ns | 123.93 ns | 1.06 | 0.34 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/01_24_2023/refs/heads/main_x64_ubuntu%2018.04_AOT=true_CompliationMode=wasm_RunKind=micro_Regression/System.Buffers.Tests.ReadOnlySequenceTests(Char)_1.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/01_24_2023/refs/heads/main_x64_ubuntu%2018.04_AOT=true_CompliationMode=wasm_RunKind=micro_Regression/System.Buffers.Tests.ReadOnlySequenceTests(Char)_2.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/01_24_2023/refs/heads/main_x64_ubuntu%2018.04_AOT=true_CompliationMode=wasm_RunKind=micro_Regression/System.Buffers.Tests.ReadOnlySequenceTests(Char)_3.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/01_24_2023/refs/heads/main_x64_ubuntu%2018.04_AOT=true_CompliationMode=wasm_RunKind=micro_Regression/System.Buffers.Tests.ReadOnlySequenceTests(Char).html>)

### Repro

```cmd
git clone https://github.com/dotnet/performance.git
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Buffers.Tests.ReadOnlySequenceTests&lt;Char&gt;*'
```
<details>

### Payloads

[Baseline](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-29f5f8e5-99ab-49a0-85a5-5b453f45f7be421729d4cc9490c91/2dd5f460-5146-47b8-ae5c-a30bb48719db.zip?sv=2021-08-06&se=2023-02-17T06%3A44%3A42Z&sr=c&sp=rl&sig=8ztcy7w94kfTkkM%2FYMdKZ9zDVA5hipguIbYOvLcMzyQ%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-aa12745e-c155-41b7-aa05-e62d8cdbac1ba53feb96501447d91/d1b17537-08fe-4709-b1e6-f8c1a472de52.zip?sv=2021-08-06&se=2023-02-19T00%3A07%3A50Z&sr=c&sp=rl&sig=GMq8ry25EHyu%2FCeO3KEwl8cnVhQHIgTIREX%2FEXUEJZ0%3D>)
### Histogram

#### System.Buffers.Tests.ReadOnlySequenceTests&lt;Char&gt;.IterateForEachArray

```log

```
### 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 168.57730147382318 > 129.4312299220948.
IsChangePoint: Marked as a change because one of 11/11/2022 3:15:52 PM, 12/9/2022 1:52:32 PM, 1/12/2023 3:42:01 AM, 1/18/2023 9:06:44 AM, 1/24/2023 6:33:57 AM falls between 1/15/2023 4:08:29 PM and 1/24/2023 6:33:57 AM.
IsRegressionStdDev: Marked as regression because -7.991065657844798 (T) = (0 -150.12832464926575) / Math.Sqrt((39.48952697299523 / (32)) + (125.02324060651331 / (22))) is less than -2.0066468050606243 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (32) + (22) - 2, .025) and -0.16277782883613565 = (129.11178810446907 - 150.12832464926575) / 129.11178810446907 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.

```#### System.Buffers.Tests.ReadOnlySequenceTests&lt;Char&gt;.IterateGetPositionTenSegments

```log

```
### 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 649.1550815292176 > 590.0567236408356.
IsChangePoint: Marked as a change because one of 1/18/2023 3:58:17 AM, 1/24/2023 6:33:57 AM falls between 1/15/2023 4:08:29 PM and 1/24/2023 6:33:57 AM.
IsRegressionStdDev: Marked as regression because -8.399963335329797 (T) = (0 -611.4948611668126) / Math.Sqrt((221.78149977044868 / (31)) + (367.3784059836182 / (23))) is less than -2.0066468050606243 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (31) + (23) - 2, .025) and -0.07073393605606147 = (571.0987954852642 - 611.4948611668126) / 571.0987954852642 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.

```#### System.Buffers.Tests.ReadOnlySequenceTests&lt;Char&gt;.SliceTenSegments

```log

```
### 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 123.93399282784121 > 123.78641176051869.
IsChangePoint: Marked as a change because one of 1/17/2023 2:19:41 PM, 1/24/2023 6:33:57 AM falls between 1/15/2023 4:08:29 PM and 1/24/2023 6:33:57 AM.
IsRegressionStdDev: Marked as regression because -5.511648651675112 (T) = (0 -131.6193788119163) / Math.Sqrt((34.47185217413856 / (27)) + (68.24448449170157 / (27))) is less than -2.0066468050606243 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (27) + (27) - 2, .025) and -0.08894142571645364 = (120.86910801957892 - 131.6193788119163) / 120.86910801957892 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.

```

### 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

Architecture | x64
-- | --
OS | ubuntu 18.04
Baseline | [19fc478d67c2fc55e62b50676935f903a77f5a4d](https://github.com/dotnet/runtime/commit/19fc478d67c2fc55e62b50676935f903a77f5a4d)
Compare | [8300e381e41bdf013c5dc697e3e9c15f68e8f249](https://github.com/dotnet/runtime/commit/8300e381e41bdf013c5dc697e3e9c15f68e8f249)
Diff | [Diff](https://github.com/dotnet/runtime/compare/19fc478d67c2fc55e62b50676935f903a77f5a4d...8300e381e41bdf013c5dc697e3e9c15f68e8f249)


### Regressions in PerfLabTests.LowLevelPerf

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio | Baseline ETL | Compare ETL
-- | -- | -- | -- | -- | -- | -- | -- | -- | -- | --
[EmptyStaticFunction - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04_AOT=true_CompliationMode=wasm_RunKind=micro/PerfLabTests.LowLevelPerf.EmptyStaticFunction.html>) | 1.86 ms | 2.08 ms | 1.12 | 0.20 | False | | |
[GenericClassGenericInstanceMethod - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04_AOT=true_CompliationMode=wasm_RunKind=micro/PerfLabTests.LowLevelPerf.GenericClassGenericInstanceMethod.html>) | 288.07 μs | 399.86 μs | 1.39 | 0.06 | False | | |
[IntegerFormatting - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04_AOT=true_CompliationMode=wasm_RunKind=micro/PerfLabTests.LowLevelPerf.IntegerFormatting.html>) | 6.43 ms | 16.00 ms | 2.49 | 0.22 | False | | |
[GenericClassGenericStaticMethod - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04_AOT=true_CompliationMode=wasm_RunKind=micro/PerfLabTests.LowLevelPerf.GenericClassGenericStaticMethod.html>) | 525.26 μs | 654.43 μs | 1.25 | 0.13 | False | | |
[GenericGenericMethod - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04_AOT=true_CompliationMode=wasm_RunKind=micro/PerfLabTests.LowLevelPerf.GenericGenericMethod.html>) | 282.59 μs | 407.45 μs | 1.44 | 0.11 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/01_24_2023/refs/heads/main_x64_ubuntu%2018.04_AOT=true_CompliationMode=wasm_RunKind=micro_Regression/PerfLabTests.LowLevelPerf_1.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/01_24_2023/refs/heads/main_x64_ubuntu%2018.04_AOT=true_CompliationMode=wasm_RunKind=micro_Regression/PerfLabTests.LowLevelPerf_2.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/01_24_2023/refs/heads/main_x64_ubuntu%2018.04_AOT=true_CompliationMode=wasm_RunKind=micro_Regression/PerfLabTests.LowLevelPerf_3.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/01_24_2023/refs/heads/main_x64_ubuntu%2018.04_AOT=true_CompliationMode=wasm_RunKind=micro_Regression/PerfLabTests.LowLevelPerf_4.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/01_24_2023/refs/heads/main_x64_ubuntu%2018.04_AOT=true_CompliationMode=wasm_RunKind=micro_Regression/PerfLabTests.LowLevelPerf_5.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/01_24_2023/refs/heads/main_x64_ubuntu%2018.04_AOT=true_CompliationMode=wasm_RunKind=micro_Regression/PerfLabTests.LowLevelPerf.html>)

### Repro

```cmd
git clone https://github.com/dotnet/performance.git
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'PerfLabTests.LowLevelPerf*'
```
<details>

### Payloads

[Baseline](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-29f5f8e5-99ab-49a0-85a5-5b453f45f7be421729d4cc9490c91/2dd5f460-5146-47b8-ae5c-a30bb48719db.zip?sv=2021-08-06&se=2023-02-17T06%3A44%3A42Z&sr=c&sp=rl&sig=8ztcy7w94kfTkkM%2FYMdKZ9zDVA5hipguIbYOvLcMzyQ%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-aa12745e-c155-41b7-aa05-e62d8cdbac1ba53feb96501447d91/d1b17537-08fe-4709-b1e6-f8c1a472de52.zip?sv=2021-08-06&se=2023-02-19T00%3A07%3A50Z&sr=c&sp=rl&sig=GMq8ry25EHyu%2FCeO3KEwl8cnVhQHIgTIREX%2FEXUEJZ0%3D>)
### Histogram

#### PerfLabTests.LowLevelPerf.EmptyStaticFunction

```log

```
### 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 2.0777625026041666 > 1.9564735608333337.
IsChangePoint: Marked as a change because one of 1/18/2023 9:06:44 AM, 1/24/2023 6:33:57 AM falls between 1/15/2023 4:08:29 PM and 1/24/2023 6:33:57 AM.
IsRegressionStdDev: Marked as regression because -8.33904228229637 (T) = (0 -2092664.665958521) / Math.Sqrt((13224642035.058285 / (32)) + (4610432699.730079 / (22))) is less than -2.0066468050606243 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (32) + (22) - 2, .025) and -0.11043203818290226 = (1884549.9715434476 - 2092664.665958521) / 1884549.9715434476 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.

```#### PerfLabTests.LowLevelPerf.GenericClassGenericInstanceMethod

```log

```
### 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 399.85781274038453 > 302.60327825.
IsChangePoint: Marked as a change because one of 1/18/2023 9:06:44 AM, 1/24/2023 6:33:57 AM falls between 1/15/2023 4:08:29 PM and 1/24/2023 6:33:57 AM.
IsRegressionStdDev: Marked as regression because -32.49655378639152 (T) = (0 -385545.59940948687) / Math.Sqrt((3722473.27127428 / (32)) + (193594183.73892084 / (22))) is less than -2.0066468050606243 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (32) + (22) - 2, .025) and -0.33632609820108267 = (288511.61399039906 - 385545.59940948687) / 288511.61399039906 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.

```#### PerfLabTests.LowLevelPerf.IntegerFormatting

```log

```
### 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 15.999866671428572 > 6.750741233177083.
IsChangePoint: Marked as a change because one of 1/15/2023 4:08:29 PM, 1/24/2023 6:33:57 AM falls between 1/15/2023 4:08:29 PM and 1/24/2023 6:33:57 AM.
IsRegressionStdDev: Marked as regression because -85.51900747711608 (T) = (0 -15665665.741158683) / Math.Sqrt((88809789056.23221 / (14)) + (190736111824.69205 / (40))) is less than -2.0066468050606243 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (14) + (40) - 2, .025) and -1.3554463402301093 = (6650826.840584391 - 15665665.741158683) / 6650826.840584391 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.

```#### PerfLabTests.LowLevelPerf.GenericClassGenericStaticMethod

```log

```
### 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 654.4288209635417 > 551.8575060757212.
IsChangePoint: Marked as a change because one of 1/18/2023 9:06:44 AM, 1/24/2023 6:33:57 AM falls between 1/15/2023 4:08:29 PM and 1/24/2023 6:33:57 AM.
IsRegressionStdDev: Marked as regression because -12.904246876630882 (T) = (0 -678746.1346516752) / Math.Sqrt((14108803.420922305 / (32)) + (3050603211.164123 / (22))) is less than -2.0066468050606243 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (32) + (22) - 2, .025) and -0.28904395828650026 = (526550.0298018685 - 678746.1346516752) / 526550.0298018685 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.

```#### PerfLabTests.LowLevelPerf.GenericGenericMethod

```log

```
### 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 407.4453983516483 > 296.680255409727.
IsChangePoint: Marked as a change because one of 1/18/2023 9:06:44 AM, 1/24/2023 6:33:57 AM falls between 1/15/2023 4:08:29 PM and 1/24/2023 6:33:57 AM.
IsRegressionStdDev: Marked as regression because -27.281880825488344 (T) = (0 -421779.54325366556) / Math.Sqrt((26778.137048615015 / (32)) + (572677012.4046113 / (22))) is less than -2.0066468050606243 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (32) + (22) - 2, .025) and -0.49258026122844734 = (282584.1626141604 - 421779.54325366556) / 282584.1626141604 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.

```

### 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

Architecture | x64
-- | --
OS | ubuntu 18.04
Baseline | [19fc478d67c2fc55e62b50676935f903a77f5a4d](https://github.com/dotnet/runtime/commit/19fc478d67c2fc55e62b50676935f903a77f5a4d)
Compare | [8300e381e41bdf013c5dc697e3e9c15f68e8f249](https://github.com/dotnet/runtime/commit/8300e381e41bdf013c5dc697e3e9c15f68e8f249)
Diff | [Diff](https://github.com/dotnet/runtime/compare/19fc478d67c2fc55e62b50676935f903a77f5a4d...8300e381e41bdf013c5dc697e3e9c15f68e8f249)


### Regressions in System.Memory.Span&lt;Byte&gt;

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio | Baseline ETL | Compare ETL
-- | -- | -- | -- | -- | -- | -- | -- | -- | -- | --
[Reverse - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04_AOT=true_CompliationMode=wasm_RunKind=micro/System.Memory.Span(Byte).Reverse(Size%3a%2033).html>) | 24.07 ns | 29.50 ns | 1.23 | 0.33 | False | | |
[Reverse - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04_AOT=true_CompliationMode=wasm_RunKind=micro/System.Memory.Span(Byte).Reverse(Size%3a%204).html>) | 13.92 ns | 16.34 ns | 1.17 | 0.49 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/01_24_2023/refs/heads/main_x64_ubuntu%2018.04_AOT=true_CompliationMode=wasm_RunKind=micro_Regression/System.Memory.Span(Byte)_1.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/01_24_2023/refs/heads/main_x64_ubuntu%2018.04_AOT=true_CompliationMode=wasm_RunKind=micro_Regression/System.Memory.Span(Byte)_2.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/01_24_2023/refs/heads/main_x64_ubuntu%2018.04_AOT=true_CompliationMode=wasm_RunKind=micro_Regression/System.Memory.Span(Byte).html>)

### Repro

```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-29f5f8e5-99ab-49a0-85a5-5b453f45f7be421729d4cc9490c91/2dd5f460-5146-47b8-ae5c-a30bb48719db.zip?sv=2021-08-06&se=2023-02-17T06%3A44%3A42Z&sr=c&sp=rl&sig=8ztcy7w94kfTkkM%2FYMdKZ9zDVA5hipguIbYOvLcMzyQ%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-aa12745e-c155-41b7-aa05-e62d8cdbac1ba53feb96501447d91/d1b17537-08fe-4709-b1e6-f8c1a472de52.zip?sv=2021-08-06&se=2023-02-19T00%3A07%3A50Z&sr=c&sp=rl&sig=GMq8ry25EHyu%2FCeO3KEwl8cnVhQHIgTIREX%2FEXUEJZ0%3D>)
### Histogram

#### System.Memory.Span&lt;Byte&gt;.Reverse(Size: 33)

```log

```
### 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 29.496475509301526 > 25.27195062677713.
IsChangePoint: Marked as a change because one of 1/18/2023 9:06:44 AM, 1/24/2023 6:33:57 AM falls between 1/15/2023 4:08:29 PM and 1/24/2023 6:33:57 AM.
IsRegressionStdDev: Marked as regression because -6.369546646014871 (T) = (0 -27.27771003379253) / Math.Sqrt((2.5862794141959067 / (32)) + (2.5748570077647295 / (22))) is less than -2.0066468050606243 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (32) + (22) - 2, .025) and -0.11590645135749313 = (24.44444155745257 - 27.27771003379253) / 24.44444155745257 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.

```#### System.Memory.Span&lt;Byte&gt;.Reverse(Size: 4)

```log

```
### 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 16.335283971111732 > 14.595210687065808.
IsChangePoint: Marked as a change because one of 12/9/2022 1:52:32 PM, 1/11/2023 4:46:06 PM, 1/18/2023 9:06:44 AM, 1/24/2023 6:33:57 AM falls between 1/15/2023 4:08:29 PM and 1/24/2023 6:33:57 AM.
IsRegressionStdDev: Marked as regression because -7.246150159413201 (T) = (0 -16.257344985231487) / Math.Sqrt((0.6651465984984736 / (32)) + (1.7153993588341885 / (22))) is less than -2.0066468050606243 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (32) + (22) - 2, .025) and -0.16288530149559166 = (13.98017926989261 - 16.257344985231487) / 13.98017926989261 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.

```

### 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

Architecture | x64
-- | --
OS | ubuntu 18.04
Baseline | [19fc478d67c2fc55e62b50676935f903a77f5a4d](https://github.com/dotnet/runtime/commit/19fc478d67c2fc55e62b50676935f903a77f5a4d)
Compare | [8300e381e41bdf013c5dc697e3e9c15f68e8f249](https://github.com/dotnet/runtime/commit/8300e381e41bdf013c5dc697e3e9c15f68e8f249)
Diff | [Diff](https://github.com/dotnet/runtime/compare/19fc478d67c2fc55e62b50676935f903a77f5a4d...8300e381e41bdf013c5dc697e3e9c15f68e8f249)


### Regressions in System.Collections.CtorDefaultSizeNonGeneric

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio | Baseline ETL | Compare ETL
-- | -- | -- | -- | -- | -- | -- | -- | -- | -- | --
[Hashtable - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04_AOT=true_CompliationMode=wasm_RunKind=micro/System.Collections.CtorDefaultSizeNonGeneric.Hashtable.html>) | 33.20 ns | 35.76 ns | 1.08 | 0.55 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/01_24_2023/refs/heads/main_x64_ubuntu%2018.04_AOT=true_CompliationMode=wasm_RunKind=micro_Regression/System.Collections.CtorDefaultSizeNonGeneric_1.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/01_24_2023/refs/heads/main_x64_ubuntu%2018.04_AOT=true_CompliationMode=wasm_RunKind=micro_Regression/System.Collections.CtorDefaultSizeNonGeneric.html>)

### Repro

```cmd
git clone https://github.com/dotnet/performance.git
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Collections.CtorDefaultSizeNonGeneric*'
```
<details>

### Payloads

[Baseline](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-29f5f8e5-99ab-49a0-85a5-5b453f45f7be421729d4cc9490c91/2dd5f460-5146-47b8-ae5c-a30bb48719db.zip?sv=2021-08-06&se=2023-02-17T06%3A44%3A42Z&sr=c&sp=rl&sig=8ztcy7w94kfTkkM%2FYMdKZ9zDVA5hipguIbYOvLcMzyQ%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-aa12745e-c155-41b7-aa05-e62d8cdbac1ba53feb96501447d91/d1b17537-08fe-4709-b1e6-f8c1a472de52.zip?sv=2021-08-06&se=2023-02-19T00%3A07%3A50Z&sr=c&sp=rl&sig=GMq8ry25EHyu%2FCeO3KEwl8cnVhQHIgTIREX%2FEXUEJZ0%3D>)
### Histogram

#### System.Collections.CtorDefaultSizeNonGeneric.Hashtable

```log

```
### 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 35.75823674828893 > 34.60016184970855.
IsChangePoint: Marked as a change because one of 12/5/2022 8:20:45 AM, 1/18/2023 9:06:44 AM, 1/24/2023 6:33:57 AM falls between 1/15/2023 4:08:29 PM and 1/24/2023 6:33:57 AM.
IsRegressionStdDev: Marked as regression because -7.092898541732629 (T) = (0 -37.7738977748661) / Math.Sqrt((2.704561306230093 / (32)) + (5.5736301002327835 / (22))) is less than -2.0066468050606243 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (32) + (22) - 2, .025) and -0.1225169092093533 = (33.65107239361963 - 37.7738977748661) / 33.65107239361963 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.

```

### 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

Architecture | x64
-- | --
OS | ubuntu 18.04
Baseline | [19fc478d67c2fc55e62b50676935f903a77f5a4d](https://github.com/dotnet/runtime/commit/19fc478d67c2fc55e62b50676935f903a77f5a4d)
Compare | [8300e381e41bdf013c5dc697e3e9c15f68e8f249](https://github.com/dotnet/runtime/commit/8300e381e41bdf013c5dc697e3e9c15f68e8f249)
Diff | [Diff](https://github.com/dotnet/runtime/compare/19fc478d67c2fc55e62b50676935f903a77f5a4d...8300e381e41bdf013c5dc697e3e9c15f68e8f249)


### Regressions in System.Linq.Tests.Perf_Enumerable

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio | Baseline ETL | Compare ETL
-- | -- | -- | -- | -- | -- | -- | -- | -- | -- | --
[Max - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04_AOT=true_CompliationMode=wasm_RunKind=micro/System.Linq.Tests.Perf_Enumerable.Max(input%3a%20IEnumerable).html>) | 2.20 μs | 2.55 μs | 1.16 | 0.24 | False | | |
[Min - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04_AOT=true_CompliationMode=wasm_RunKind=micro/System.Linq.Tests.Perf_Enumerable.Min(input%3a%20IEnumerable).html>) | 2.16 μs | 2.53 μs | 1.17 | 0.22 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/01_24_2023/refs/heads/main_x64_ubuntu%2018.04_AOT=true_CompliationMode=wasm_RunKind=micro_Regression/System.Linq.Tests.Perf_Enumerable_1.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/01_24_2023/refs/heads/main_x64_ubuntu%2018.04_AOT=true_CompliationMode=wasm_RunKind=micro_Regression/System.Linq.Tests.Perf_Enumerable_2.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/01_24_2023/refs/heads/main_x64_ubuntu%2018.04_AOT=true_CompliationMode=wasm_RunKind=micro_Regression/System.Linq.Tests.Perf_Enumerable.html>)

### Repro

```cmd
git clone https://github.com/dotnet/performance.git
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Linq.Tests.Perf_Enumerable*'
```
<details>

### Payloads

[Baseline](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-29f5f8e5-99ab-49a0-85a5-5b453f45f7be421729d4cc9490c91/2dd5f460-5146-47b8-ae5c-a30bb48719db.zip?sv=2021-08-06&se=2023-02-17T06%3A44%3A42Z&sr=c&sp=rl&sig=8ztcy7w94kfTkkM%2FYMdKZ9zDVA5hipguIbYOvLcMzyQ%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-aa12745e-c155-41b7-aa05-e62d8cdbac1ba53feb96501447d91/d1b17537-08fe-4709-b1e6-f8c1a472de52.zip?sv=2021-08-06&se=2023-02-19T00%3A07%3A50Z&sr=c&sp=rl&sig=GMq8ry25EHyu%2FCeO3KEwl8cnVhQHIgTIREX%2FEXUEJZ0%3D>)
### Histogram

#### System.Linq.Tests.Perf_Enumerable.Max(input: IEnumerable)

```log

```
### 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 2.5542139839806897 > 2.2965649845619986.
IsChangePoint: Marked as a change because one of 12/9/2022 1:52:32 PM, 1/12/2023 3:42:01 AM, 1/18/2023 9:06:44 AM, 1/24/2023 6:33:57 AM falls between 1/15/2023 4:08:29 PM and 1/24/2023 6:33:57 AM.
IsRegressionStdDev: Marked as regression because -15.545053296030265 (T) = (0 -2599.3393038626728) / Math.Sqrt((5964.80182199081 / (32)) + (8670.259667415621 / (22))) is less than -2.0066468050606243 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (32) + (22) - 2, .025) and -0.1683460289006842 = (2224.802618029552 - 2599.3393038626728) / 2224.802618029552 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.

```#### System.Linq.Tests.Perf_Enumerable.Min(input: IEnumerable)

```log

```
### 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 2.52573214617615 > 2.2845308787465597.
IsChangePoint: Marked as a change because one of 12/9/2022 1:52:32 PM, 1/12/2023 3:42:01 AM, 1/18/2023 9:06:44 AM, 1/24/2023 6:33:57 AM falls between 1/15/2023 4:08:29 PM and 1/24/2023 6:33:57 AM.
IsRegressionStdDev: Marked as regression because -13.94699586344723 (T) = (0 -2592.7625435435334) / Math.Sqrt((4919.536191229149 / (32)) + (14450.998808596494 / (22))) is less than -2.0066468050606243 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (32) + (22) - 2, .025) and -0.18084862529589368 = (2195.6773188382604 - 2592.7625435435334) / 2195.6773188382604 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.

```

### 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

Architecture | x64
-- | --
OS | ubuntu 18.04
Baseline | [19fc478d67c2fc55e62b50676935f903a77f5a4d](https://github.com/dotnet/runtime/commit/19fc478d67c2fc55e62b50676935f903a77f5a4d)
Compare | [8300e381e41bdf013c5dc697e3e9c15f68e8f249](https://github.com/dotnet/runtime/commit/8300e381e41bdf013c5dc697e3e9c15f68e8f249)
Diff | [Diff](https://github.com/dotnet/runtime/compare/19fc478d67c2fc55e62b50676935f903a77f5a4d...8300e381e41bdf013c5dc697e3e9c15f68e8f249)


### Regressions in System.Collections.Concurrent.IsEmpty&lt;Int32&gt;

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio | Baseline ETL | Compare ETL
-- | -- | -- | -- | -- | -- | -- | -- | -- | -- | --
[Bag - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04_AOT=true_CompliationMode=wasm_RunKind=micro/System.Collections.Concurrent.IsEmpty(Int32).Bag(Size%3a%20512).html>) | 46.02 ns | 55.31 ns | 1.20 | 0.65 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/01_24_2023/refs/heads/main_x64_ubuntu%2018.04_AOT=true_CompliationMode=wasm_RunKind=micro_Regression/System.Collections.Concurrent.IsEmpty(Int32)_1.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/01_24_2023/refs/heads/main_x64_ubuntu%2018.04_AOT=true_CompliationMode=wasm_RunKind=micro_Regression/System.Collections.Concurrent.IsEmpty(Int32).html>)

### Repro

```cmd
git clone https://github.com/dotnet/performance.git
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Collections.Concurrent.IsEmpty&lt;Int32&gt;*'
```
<details>

### Payloads

[Baseline](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-29f5f8e5-99ab-49a0-85a5-5b453f45f7be421729d4cc9490c91/2dd5f460-5146-47b8-ae5c-a30bb48719db.zip?sv=2021-08-06&se=2023-02-17T06%3A44%3A42Z&sr=c&sp=rl&sig=8ztcy7w94kfTkkM%2FYMdKZ9zDVA5hipguIbYOvLcMzyQ%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-aa12745e-c155-41b7-aa05-e62d8cdbac1ba53feb96501447d91/d1b17537-08fe-4709-b1e6-f8c1a472de52.zip?sv=2021-08-06&se=2023-02-19T00%3A07%3A50Z&sr=c&sp=rl&sig=GMq8ry25EHyu%2FCeO3KEwl8cnVhQHIgTIREX%2FEXUEJZ0%3D>)
### Histogram

#### System.Collections.Concurrent.IsEmpty&lt;Int32&gt;.Bag(Size: 512)

```log

```
### 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 55.31339062338936 > 50.430543768541376.
IsChangePoint: Marked as a change because one of 1/18/2023 9:06:44 AM, 1/24/2023 6:33:57 AM falls between 1/15/2023 4:08:29 PM and 1/24/2023 6:33:57 AM.
IsRegressionStdDev: Marked as regression because -4.010250998350441 (T) = (0 -56.00902489524304) / Math.Sqrt((20.5846307653969 / (32)) + (29.086145886795244 / (22))) is less than -2.0066468050606243 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (32) + (22) - 2, .025) and -0.1115770780520157 = (50.38699160061496 - 56.00902489524304) / 50.38699160061496 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.

```

### 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

Architecture | x64
-- | --
OS | ubuntu 18.04
Baseline | [19fc478d67c2fc55e62b50676935f903a77f5a4d](https://github.com/dotnet/runtime/commit/19fc478d67c2fc55e62b50676935f903a77f5a4d)
Compare | [8300e381e41bdf013c5dc697e3e9c15f68e8f249](https://github.com/dotnet/runtime/commit/8300e381e41bdf013c5dc697e3e9c15f68e8f249)
Diff | [Diff](https://github.com/dotnet/runtime/compare/19fc478d67c2fc55e62b50676935f903a77f5a4d...8300e381e41bdf013c5dc697e3e9c15f68e8f249)


### Regressions in System.Tests.Perf_Random

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio | Baseline ETL | Compare ETL
-- | -- | -- | -- | -- | -- | -- | -- | -- | -- | --
[Next_int_unseeded - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04_AOT=true_CompliationMode=wasm_RunKind=micro/System.Tests.Perf_Random.Next_int_unseeded.html>) | 31.54 ns | 36.32 ns | 1.15 | 0.68 | False | | |
[Next_int - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04_AOT=true_CompliationMode=wasm_RunKind=micro/System.Tests.Perf_Random.Next_int.html>) | 31.08 ns | 39.53 ns | 1.27 | 0.67 | False | | |
[Next_long - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04_AOT=true_CompliationMode=wasm_RunKind=micro/System.Tests.Perf_Random.Next_long.html>) | 92.72 ns | 101.65 ns | 1.10 | 0.34 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/01_24_2023/refs/heads/main_x64_ubuntu%2018.04_AOT=true_CompliationMode=wasm_RunKind=micro_Regression/System.Tests.Perf_Random_1.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/01_24_2023/refs/heads/main_x64_ubuntu%2018.04_AOT=true_CompliationMode=wasm_RunKind=micro_Regression/System.Tests.Perf_Random_2.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/01_24_2023/refs/heads/main_x64_ubuntu%2018.04_AOT=true_CompliationMode=wasm_RunKind=micro_Regression/System.Tests.Perf_Random_3.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/01_24_2023/refs/heads/main_x64_ubuntu%2018.04_AOT=true_CompliationMode=wasm_RunKind=micro_Regression/System.Tests.Perf_Random.html>)

### Repro

```cmd
git clone https://github.com/dotnet/performance.git
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Tests.Perf_Random*'
```
<details>

### Payloads

[Baseline](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-29f5f8e5-99ab-49a0-85a5-5b453f45f7be421729d4cc9490c91/2dd5f460-5146-47b8-ae5c-a30bb48719db.zip?sv=2021-08-06&se=2023-02-17T06%3A44%3A42Z&sr=c&sp=rl&sig=8ztcy7w94kfTkkM%2FYMdKZ9zDVA5hipguIbYOvLcMzyQ%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-aa12745e-c155-41b7-aa05-e62d8cdbac1ba53feb96501447d91/d1b17537-08fe-4709-b1e6-f8c1a472de52.zip?sv=2021-08-06&se=2023-02-19T00%3A07%3A50Z&sr=c&sp=rl&sig=GMq8ry25EHyu%2FCeO3KEwl8cnVhQHIgTIREX%2FEXUEJZ0%3D>)
### Histogram

#### System.Tests.Perf_Random.Next_int_unseeded

```log

```
### 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 36.31676164278097 > 32.450065407653106.
IsChangePoint: Marked as a change because one of 12/7/2022 5:17:51 AM, 1/18/2023 9:06:44 AM, 1/24/2023 6:33:57 AM falls between 1/15/2023 4:08:29 PM and 1/24/2023 6:33:57 AM.
IsRegressionStdDev: Marked as regression because -7.761320066892196 (T) = (0 -36.77698501590825) / Math.Sqrt((4.1244260360284954 / (32)) + (8.120823073221315 / (22))) is less than -2.0066468050606243 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (32) + (22) - 2, .025) and -0.17499110542221658 = (31.299798650554855 - 36.77698501590825) / 31.299798650554855 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.

```#### System.Tests.Perf_Random.Next_int

```log

```
### 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 39.527610167892746 > 34.15863407003011.
IsChangePoint: Marked as a change because one of 1/18/2023 9:06:44 AM, 1/24/2023 6:33:57 AM falls between 1/15/2023 4:08:29 PM and 1/24/2023 6:33:57 AM.
IsRegressionStdDev: Marked as regression because -8.133106537691837 (T) = (0 -35.36393237750524) / Math.Sqrt((5.645423626696244 / (32)) + (6.777199158960745 / (22))) is less than -2.0066468050606243 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (32) + (22) - 2, .025) and -0.1905864814717677 = (29.702951383917444 - 35.36393237750524) / 29.702951383917444 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.

```#### System.Tests.Perf_Random.Next_long

```log

```
### 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 101.64717876401252 > 97.65172483793113.
IsChangePoint: Marked as a change because one of 1/18/2023 3:58:17 AM, 1/24/2023 6:33:57 AM falls between 1/15/2023 4:08:29 PM and 1/24/2023 6:33:57 AM.
IsRegressionStdDev: Marked as regression because -7.849730294836891 (T) = (0 -102.9104190573666) / Math.Sqrt((9.193992187457193 / (31)) + (15.929321628870577 / (23))) is less than -2.0066468050606243 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (31) + (23) - 2, .025) and -0.08209034779825782 = (95.10335182894816 - 102.9104190573666) / 95.10335182894816 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.

```

### 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

Architecture | x64
-- | --
OS | ubuntu 18.04
Baseline | [19fc478d67c2fc55e62b50676935f903a77f5a4d](https://github.com/dotnet/runtime/commit/19fc478d67c2fc55e62b50676935f903a77f5a4d)
Compare | [8300e381e41bdf013c5dc697e3e9c15f68e8f249](https://github.com/dotnet/runtime/commit/8300e381e41bdf013c5dc697e3e9c15f68e8f249)
Diff | [Diff](https://github.com/dotnet/runtime/compare/19fc478d67c2fc55e62b50676935f903a77f5a4d...8300e381e41bdf013c5dc697e3e9c15f68e8f249)


### Regressions in PerfLabTests.DictionaryExpansion

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio | Baseline ETL | Compare ETL
-- | -- | -- | -- | -- | -- | -- | -- | -- | -- | --
[ExpandDictionaries - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04_AOT=true_CompliationMode=wasm_RunKind=micro/PerfLabTests.DictionaryExpansion.ExpandDictionaries.html>) | 1.54 μs | 1.78 μs | 1.16 | 0.06 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/01_24_2023/refs/heads/main_x64_ubuntu%2018.04_AOT=true_CompliationMode=wasm_RunKind=micro_Regression/PerfLabTests.DictionaryExpansion_1.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/01_24_2023/refs/heads/main_x64_ubuntu%2018.04_AOT=true_CompliationMode=wasm_RunKind=micro_Regression/PerfLabTests.DictionaryExpansion.html>)

### Repro

```cmd
git clone https://github.com/dotnet/performance.git
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'PerfLabTests.DictionaryExpansion*'
```
<details>

### Payloads

[Baseline](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-29f5f8e5-99ab-49a0-85a5-5b453f45f7be421729d4cc9490c91/2dd5f460-5146-47b8-ae5c-a30bb48719db.zip?sv=2021-08-06&se=2023-02-17T06%3A44%3A42Z&sr=c&sp=rl&sig=8ztcy7w94kfTkkM%2FYMdKZ9zDVA5hipguIbYOvLcMzyQ%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-aa12745e-c155-41b7-aa05-e62d8cdbac1ba53feb96501447d91/d1b17537-08fe-4709-b1e6-f8c1a472de52.zip?sv=2021-08-06&se=2023-02-19T00%3A07%3A50Z&sr=c&sp=rl&sig=GMq8ry25EHyu%2FCeO3KEwl8cnVhQHIgTIREX%2FEXUEJZ0%3D>)
### Histogram

#### PerfLabTests.DictionaryExpansion.ExpandDictionaries

```log

```
### 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 1.7846032902529425 > 1.619365508920234.
IsChangePoint: Marked as a change because one of 1/18/2023 9:06:44 AM, 1/24/2023 6:33:57 AM falls between 1/15/2023 4:08:29 PM and 1/24/2023 6:33:57 AM.
IsRegressionStdDev: Marked as regression because -19.62660129151795 (T) = (0 -1764.8116436097232) / Math.Sqrt((671.913963459265 / (32)) + (2087.395903005932 / (22))) is less than -2.0066468050606243 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (32) + (22) - 2, .025) and -0.1359958826298745 = (1553.5370071272757 - 1764.8116436097232) / 1553.5370071272757 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.

```

### 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

Architecture | x64
-- | --
OS | ubuntu 18.04
Baseline | [19fc478d67c2fc55e62b50676935f903a77f5a4d](https://github.com/dotnet/runtime/commit/19fc478d67c2fc55e62b50676935f903a77f5a4d)
Compare | [8300e381e41bdf013c5dc697e3e9c15f68e8f249](https://github.com/dotnet/runtime/commit/8300e381e41bdf013c5dc697e3e9c15f68e8f249)
Diff | [Diff](https://github.com/dotnet/runtime/compare/19fc478d67c2fc55e62b50676935f903a77f5a4d...8300e381e41bdf013c5dc697e3e9c15f68e8f249)


### Regressions in System.Tests.Perf_HashCode

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio | Baseline ETL | Compare ETL
-- | -- | -- | -- | -- | -- | -- | -- | -- | -- | --
[Add - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04_AOT=true_CompliationMode=wasm_RunKind=micro/System.Tests.Perf_HashCode.Add.html>) | 7.47 μs | 10.35 μs | 1.38 | 0.20 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/01_24_2023/refs/heads/main_x64_ubuntu%2018.04_AOT=true_CompliationMode=wasm_RunKind=micro_Regression/System.Tests.Perf_HashCode_1.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/01_24_2023/refs/heads/main_x64_ubuntu%2018.04_AOT=true_CompliationMode=wasm_RunKind=micro_Regression/System.Tests.Perf_HashCode.html>)

### Repro

```cmd
git clone https://github.com/dotnet/performance.git
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Tests.Perf_HashCode*'
```
<details>

### Payloads

[Baseline](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-29f5f8e5-99ab-49a0-85a5-5b453f45f7be421729d4cc9490c91/2dd5f460-5146-47b8-ae5c-a30bb48719db.zip?sv=2021-08-06&se=2023-02-17T06%3A44%3A42Z&sr=c&sp=rl&sig=8ztcy7w94kfTkkM%2FYMdKZ9zDVA5hipguIbYOvLcMzyQ%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-aa12745e-c155-41b7-aa05-e62d8cdbac1ba53feb96501447d91/d1b17537-08fe-4709-b1e6-f8c1a472de52.zip?sv=2021-08-06&se=2023-02-19T00%3A07%3A50Z&sr=c&sp=rl&sig=GMq8ry25EHyu%2FCeO3KEwl8cnVhQHIgTIREX%2FEXUEJZ0%3D>)
### Histogram

#### System.Tests.Perf_HashCode.Add

```log

```
### 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 10.349680475694125 > 7.89002947445516.
IsChangePoint: Marked as a change because one of 1/12/2023 3:42:01 AM, 1/18/2023 9:06:44 AM, 1/24/2023 6:33:57 AM falls between 1/15/2023 4:08:29 PM and 1/24/2023 6:33:57 AM.
IsRegressionStdDev: Marked as regression because -31.23939466955221 (T) = (0 -9753.146522303574) / Math.Sqrt((121458.9151308833 / (32)) + (33038.97876432847 / (22))) is less than -2.0066468050606243 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (32) + (22) - 2, .025) and -0.30399245155123705 = (7479.450138458374 - 9753.146522303574) / 7479.450138458374 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.

```

### 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>




Architecture	x64
OS	ubuntu 18.04
Baseline	19fc478d67c2fc55e62b50676935f903a77f5a4d
Compare	8300e381e41bdf013c5dc697e3e9c15f68e8f249
Diff	Diff

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector
IterateForEachArray - Duration of single invocation	122.34 ns	168.58 ns	1.38	0.48	False
IterateGetPositionTenSegments - Duration of single invocation	567.79 ns	649.16 ns	1.14	0.30	False
SliceTenSegments - Duration of single invocation	116.74 ns	123.93 ns	1.06	0.34	False

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector
EmptyStaticFunction - Duration of single invocation	1.86 ms	2.08 ms	1.12	0.20	False
GenericClassGenericInstanceMethod - Duration of single invocation	288.07 μs	399.86 μs	1.39	0.06	False
IntegerFormatting - Duration of single invocation	6.43 ms	16.00 ms	2.49	0.22	False
GenericClassGenericStaticMethod - Duration of single invocation	525.26 μs	654.43 μs	1.25	0.13	False
GenericGenericMethod - Duration of single invocation	282.59 μs	407.45 μs	1.44	0.11	False

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio	Baseline ETL	Compare ETL
Reverse - Duration of single invocation	24.07 ns	29.50 ns	1.23	0.33	False
Reverse - Duration of single invocation	13.92 ns	16.34 ns	1.17	0.49	False

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio	Baseline ETL	Compare ETL
Max - Duration of single invocation	2.20 μs	2.55 μs	1.16	0.24	False
Min - Duration of single invocation	2.16 μs	2.53 μs	1.17	0.22	False

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector
Next_int_unseeded - Duration of single invocation	31.54 ns	36.32 ns	1.15	0.68	False
Next_int - Duration of single invocation	31.08 ns	39.53 ns	1.27	0.67	False
Next_long - Duration of single invocation	92.72 ns	101.65 ns	1.10	0.34	False

[Perf] Linux/x64: 22 Regressions on 1/19/2023 7:53:02 PM #12123

Description

Run Information

Regressions in System.Buffers.Tests.ReadOnlySequenceTests<Char>

Repro

Payloads

Histogram

System.Buffers.Tests.ReadOnlySequenceTests<Char>.IterateForEachArray

Description of detection logic

Description of detection logic

Description of detection logic

Docs

Regressions in PerfLabTests.LowLevelPerf

Repro

Payloads

Histogram

PerfLabTests.LowLevelPerf.EmptyStaticFunction

Description of detection logic

Description of detection logic

Description of detection logic

Description of detection logic

Description of detection logic

Docs

Run Information

Regressions in System.Memory.Span<Byte>

Repro

Payloads

Histogram

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

Description of detection logic

Description of detection logic

Docs

Run Information

Regressions in System.Collections.CtorDefaultSizeNonGeneric

Repro

Payloads

Histogram

System.Collections.CtorDefaultSizeNonGeneric.Hashtable

Description of detection logic

Docs

Run Information

Regressions in System.Linq.Tests.Perf_Enumerable

Repro

Payloads

Histogram

System.Linq.Tests.Perf_Enumerable.Max(input: IEnumerable)

Description of detection logic

Description of detection logic

Docs

Run Information

Regressions in System.Collections.Concurrent.IsEmpty<Int32>

Repro

Payloads

Histogram

System.Collections.Concurrent.IsEmpty<Int32>.Bag(Size: 512)

Description of detection logic

Docs

Run Information

Regressions in System.Tests.Perf_Random

Repro

Payloads

Histogram

System.Tests.Perf_Random.Next_int_unseeded

Description of detection logic

Description of detection logic

Description of detection logic

Docs

Run Information

Regressions in PerfLabTests.DictionaryExpansion

Repro

Payloads

Histogram

PerfLabTests.DictionaryExpansion.ExpandDictionaries

Description of detection logic

Docs

Run Information

Regressions in System.Tests.Perf_HashCode

Repro

Payloads

Histogram