Regressions in System.Buffers.Text.Tests.Base64Tests

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 18.04
Queue | TigerUbuntu
Baseline | [0fc8978b8f056647a88f7b18de8840fead97d16e](https://github.com/dotnet/runtime/commit/0fc8978b8f056647a88f7b18de8840fead97d16e)
Compare | [2677eb26595966013d73d6d04e4350ecb09b71b3](https://github.com/dotnet/runtime/commit/2677eb26595966013d73d6d04e4350ecb09b71b3)
Diff | [Diff](https://github.com/dotnet/runtime/compare/0fc8978b8f056647a88f7b18de8840fead97d16e...2677eb26595966013d73d6d04e4350ecb09b71b3)
Configs | CompilationMode:tiered, RunKind:micro


### Regressions in System.Buffers.Text.Tests.Base64Tests

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio | Baseline ETL | Compare ETL
-- | -- | -- | -- | -- | -- | -- | -- | -- | -- | --
[ConvertToBase64CharArray - Duration of single invocation](<https://pvscmdupload.blob.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04/System.Buffers.Text.Tests.Base64Tests.ConvertToBase64CharArray(NumberOfBytes%3a%201000).html>) | 90.87 ns | 101.09 ns | 1.11 | 0.05 | False | | |
[ConvertTryFromBase64Chars - Duration of single invocation](<https://pvscmdupload.blob.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04/System.Buffers.Text.Tests.Base64Tests.ConvertTryFromBase64Chars(NumberOfBytes%3a%201000).html>) | 708.90 ns | 883.55 ns | 1.25 | 0.03 | True | | |

![graph](<https://pvscmdupload.blob.core.windows.net/autofilereport/autofilereports/05_02_2023/refs/heads/main_x64_ubuntu%2018.04_Regression/System.Buffers.Text.Tests.Base64Tests_2.png>)
[Test Report](<https://pvscmdupload.blob.core.windows.net/autofilereport/autofilereports/05_02_2023/refs/heads/main_x64_ubuntu%2018.04_Regression/System.Buffers.Text.Tests.Base64Tests.html>)

### Repro
General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

### Payloads

[Baseline](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-0f613ba5-02c7-4515-92c3-c4974da743b6b3e8d6f64404a3ab6/614912f1-3a5f-48ca-921b-c18362b0f36e.zip?sv=2021-08-06&se=2023-05-25T19%3A39%3A49Z&sr=c&sp=rl&sig=pRyxH8WMEQaqMaAjp2GELJwATKJJAXFnhX%2BRasYmrJM%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-8c091c9f-8272-4883-81ac-7a81ab633dc8a3263421e8d4acd8e/3764625f-b93c-44ae-9cdf-9eedf1cb61bf.zip?sv=2021-08-06&se=2023-05-26T07%3A27%3A56Z&sr=c&sp=rl&sig=n5Ed%2BOwRSv%2B2mv0FzGm6zHLxvTD5YxfncRhzykzBdbM%3D>)

```cmd
git clone https://github.com/dotnet/performance.git
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Buffers.Text.Tests.Base64Tests*'
```

<details>


### Payloads

[Baseline](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-0f613ba5-02c7-4515-92c3-c4974da743b6b3e8d6f64404a3ab6/614912f1-3a5f-48ca-921b-c18362b0f36e.zip?sv=2021-08-06&se=2023-05-25T19%3A39%3A49Z&sr=c&sp=rl&sig=pRyxH8WMEQaqMaAjp2GELJwATKJJAXFnhX%2BRasYmrJM%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-8c091c9f-8272-4883-81ac-7a81ab633dc8a3263421e8d4acd8e/3764625f-b93c-44ae-9cdf-9eedf1cb61bf.zip?sv=2021-08-06&se=2023-05-26T07%3A27%3A56Z&sr=c&sp=rl&sig=n5Ed%2BOwRSv%2B2mv0FzGm6zHLxvTD5YxfncRhzykzBdbM%3D>)
### Histogram

#### System.Buffers.Text.Tests.Base64Tests.ConvertToBase64CharArray(NumberOfBytes: 1000)

```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 101.0858478228857 > 96.28683349225703.
IsChangePoint: Marked as a change because one of 3/3/2023 11:43:56 AM, 4/6/2023 9:09:21 PM, 4/12/2023 4:44:56 PM, 4/25/2023 9:59:52 PM, 5/2/2023 10:35:24 AM falls between 4/23/2023 8:38:14 PM and 5/2/2023 10:35:24 AM.
IsRegressionStdDev: Marked as regression because -9.810501795301963 (T) = (0 -98.97715324049292) / Math.Sqrt((0.9023212323500576 / (24)) + (11.561718294618387 / (26))) is less than -2.010634757623041 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (24) + (26) - 2, .025) and -0.07392275044866876 = (92.1641274469153 - 98.97715324049292) / 92.1641274469153 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.Buffers.Text.Tests.Base64Tests.ConvertTryFromBase64Chars(NumberOfBytes: 1000)

```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 883.5495646695737 > 744.2182067645552.
IsChangePoint: Marked as a change because one of 4/25/2023 6:46:56 PM, 5/2/2023 10:35:24 AM falls between 4/23/2023 8:38:14 PM and 5/2/2023 10:35:24 AM.
IsRegressionStdDev: Marked as regression because -20.449742638469235 (T) = (0 -850.7807432545828) / Math.Sqrt((0.5076109236363467 / (23)) + (1287.4310849805913 / (27))) is less than -2.010634757623041 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (23) + (27) - 2, .025) and -0.1990642364873253 = (709.5372519381917 - 850.7807432545828) / 709.5372519381917 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 18.04
Queue | TigerUbuntu
Baseline | [0fc8978b8f056647a88f7b18de8840fead97d16e](https://github.com/dotnet/runtime/commit/0fc8978b8f056647a88f7b18de8840fead97d16e)
Compare | [2677eb26595966013d73d6d04e4350ecb09b71b3](https://github.com/dotnet/runtime/commit/2677eb26595966013d73d6d04e4350ecb09b71b3)
Diff | [Diff](https://github.com/dotnet/runtime/compare/0fc8978b8f056647a88f7b18de8840fead97d16e...2677eb26595966013d73d6d04e4350ecb09b71b3)
Configs | CompilationMode:tiered, RunKind:micro


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

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio | Baseline ETL | Compare ETL
-- | -- | -- | -- | -- | -- | -- | -- | -- | -- | --
[IDictionary - Duration of single invocation](<https://pvscmdupload.blob.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04/System.Collections.CreateAddAndClear(Int32).IDictionary(Size%3a%20512).html>) | 7.66 μs | 8.36 μs | 1.09 | 0.40 | False | | |

[Test Report](<https://pvscmdupload.blob.core.windows.net/autofilereport/autofilereports/05_02_2023/refs/heads/main_x64_ubuntu%2018.04_Regression/System.Collections.CreateAddAndClear%28Int32%29.html>)

### Repro
General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

### Payloads

[Baseline](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-0f613ba5-02c7-4515-92c3-c4974da743b6b3e8d6f64404a3ab6/614912f1-3a5f-48ca-921b-c18362b0f36e.zip?sv=2021-08-06&se=2023-05-25T19%3A39%3A49Z&sr=c&sp=rl&sig=pRyxH8WMEQaqMaAjp2GELJwATKJJAXFnhX%2BRasYmrJM%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-8c091c9f-8272-4883-81ac-7a81ab633dc8a3263421e8d4acd8e/3764625f-b93c-44ae-9cdf-9eedf1cb61bf.zip?sv=2021-08-06&se=2023-05-26T07%3A27%3A56Z&sr=c&sp=rl&sig=n5Ed%2BOwRSv%2B2mv0FzGm6zHLxvTD5YxfncRhzykzBdbM%3D>)

```cmd
git clone https://github.com/dotnet/performance.git
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Collections.CreateAddAndClear&lt;Int32&gt;*'
```

<details>


### Payloads

[Baseline](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-0f613ba5-02c7-4515-92c3-c4974da743b6b3e8d6f64404a3ab6/614912f1-3a5f-48ca-921b-c18362b0f36e.zip?sv=2021-08-06&se=2023-05-25T19%3A39%3A49Z&sr=c&sp=rl&sig=pRyxH8WMEQaqMaAjp2GELJwATKJJAXFnhX%2BRasYmrJM%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-8c091c9f-8272-4883-81ac-7a81ab633dc8a3263421e8d4acd8e/3764625f-b93c-44ae-9cdf-9eedf1cb61bf.zip?sv=2021-08-06&se=2023-05-26T07%3A27%3A56Z&sr=c&sp=rl&sig=n5Ed%2BOwRSv%2B2mv0FzGm6zHLxvTD5YxfncRhzykzBdbM%3D>)
### Histogram

#### System.Collections.CreateAddAndClear&lt;Int32&gt;.IDictionary(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 8.360488408605024 > 8.025009931037973.
IsChangePoint: Marked as a change because one of 4/25/2023 9:59:52 PM, 5/2/2023 10:35:24 AM falls between 4/23/2023 8:38:14 PM and 5/2/2023 10:35:24 AM.
IsRegressionStdDev: Marked as regression because -6.282775267319722 (T) = (0 -8407.657780524381) / Math.Sqrt((127597.98989070946 / (24)) + (250458.19337109587 / (26))) is less than -2.010634757623041 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (24) + (26) - 2, .025) and -0.10055480283491654 = (7639.4721633735235 - 8407.657780524381) / 7639.4721633735235 is less than -0.05.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```
### JIT Disasms



### Docs

[Profiling workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/profiling-workflow-dotnet-runtime.md)
[Benchmarking workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/benchmarking-workflow-dotnet-runtime.md)

</details>

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Regressions in System.Buffers.Text.Tests.Base64Tests #85761

Run Information