[Perf] Linux/arm64: 5 Improvements on 10/4/2023 1:30:06 AM

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 20.04
Queue | AmpereUbuntu
Baseline | [1780220c9b2963e127599accc618208975c4711f](https://github.com/dotnet/runtime/commit/1780220c9b2963e127599accc618208975c4711f)
Compare | [aa2d13ab1789892c9fe7c2dbcd57fea035b1c0e0](https://github.com/dotnet/runtime/commit/aa2d13ab1789892c9fe7c2dbcd57fea035b1c0e0)
Diff | [Diff](https://github.com/dotnet/runtime/compare/1780220c9b2963e127599accc618208975c4711f...aa2d13ab1789892c9fe7c2dbcd57fea035b1c0e0)
Configs | CompilationMode:tiered, RunKind:micro


### Improvements in System.IO.Tests.Perf_FileStream

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[AppendAsync - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_ubuntu 20.04/System.IO.Tests.Perf_FileStream.AppendAsync(fileSize%3a%201048576%2c%20userBufferSize%3a%204096%2c%20options%3a%20DeleteOnClose%2c%20Asynchronous).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.IO.FileSystem/Perf.FileStream.cs#L320-#L324>)</li><li>[📈 - ADX Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 2.74 ms | 1.15 ms | 0.42 | 0.78 | False | | |
|<ul><li>[Read - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_ubuntu 20.04/System.IO.Tests.Perf_FileStream.Read(fileSize%3a%201024%2c%20userBufferSize%3a%201024%2c%20options%3a%20None).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.IO.FileSystem/Perf.FileStream.cs#L199-#L202>)</li><li>[📈 - ADX Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 5.90 μs | 5.08 μs | 0.86 | 0.60 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_12_2023/refs/heads/main_arm64_ubuntu%2020.04_Improvement/System.IO.Tests.Perf_FileStream_1.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_12_2023/refs/heads/main_arm64_ubuntu%2020.04_Improvement/System.IO.Tests.Perf_FileStream_2.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_12_2023/refs/heads/main_arm64_ubuntu%2020.04_Improvement/System.IO.Tests.Perf_FileStream.html>)

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

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

<details>


### Payloads

[Baseline](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-3a211097-434e-4b78-b5da-0ed6b91171a2c59147124a9420ca9/24c01d85-0c9f-426e-9796-03509a2fc8ce.zip?sv=2021-08-06&se=2023-11-01T20%3A18%3A15Z&sr=c&sp=rl&sig=AQbAY9GdN7i5zYaxAqgYe5rTCoM%2B7T1Uibe1ppw4pDQ%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-aebb0ecd-0bd3-4d3d-89f6-ba51edeb508312c6cd149b54a46bd/17150712-254d-401f-a272-1961845a89b1.zip?sv=2021-08-06&se=2023-11-03T17%3A23%3A07Z&sr=c&sp=rl&sig=l6am%2FutqLz6tHPwD%2FKy9ib4S7cdzHcIrufl9rSZJsBM%3D>)
### System.IO.Tests.Perf_FileStream.AppendAsync(fileSize: 1048576, userBufferSize: 4096, options: DeleteOnClose, Asynchronous)

#### ETL Files

#### Histogram

#### Description of detection logic
```
IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsImprovementWindowed: Marked as improvement because 1.1536774203431372 < 2.142542809395833.
IsChangePoint: Marked as a change because one of 8/18/2023 11:08:41 PM, 10/3/2023 10:08:56 AM, 10/11/2023 11:44:03 AM falls between 10/2/2023 7:07:56 PM and 10/11/2023 11:44:03 AM.
IsImprovementStdDev: Marked as improvement because 4.470219648542138 (T) = (0 -1334364.00070017) / Math.Sqrt((171166239222.65512 / (299)) + (25024340019.995605 / (12))) is greater than 1.9676708853560316 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (299) + (12) - 2, .975) and 0.14727431194897914 = (1564822.0985930136 - 1334364.00070017) / 1564822.0985930136 is greater than 0.05.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```
#### JIT Disasms

### System.IO.Tests.Perf_FileStream.Read(fileSize: 1024, userBufferSize: 1024, options: None)

#### ETL Files

#### Histogram

#### Description of detection logic
```
IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsImprovementWindowed: Marked as improvement because 5.082271395199957 < 5.630305386389564.
IsChangePoint: Marked as a change because one of 8/31/2023 1:23:15 PM, 10/2/2023 7:07:56 PM, 10/11/2023 11:44:03 AM falls between 10/2/2023 7:07:56 PM and 10/11/2023 11:44:03 AM.
IsImprovementStdDev: Marked as improvement because 8.455964525961894 (T) = (0 -5077.009081415826) / Math.Sqrt((276736.29015048034 / (299)) + (46873.78289175055 / (13))) is greater than 1.9676459287777595 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (299) + (13) - 2, .975) and 0.10081217123139403 = (5646.216417729478 - 5077.009081415826) / 5646.216417729478 is greater than 0.05.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```
#### JIT Disasms



### Docs

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

</details>


---


### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 20.04
Queue | AmpereUbuntu
Baseline | [1780220c9b2963e127599accc618208975c4711f](https://github.com/dotnet/runtime/commit/1780220c9b2963e127599accc618208975c4711f)
Compare | [aa2d13ab1789892c9fe7c2dbcd57fea035b1c0e0](https://github.com/dotnet/runtime/commit/aa2d13ab1789892c9fe7c2dbcd57fea035b1c0e0)
Diff | [Diff](https://github.com/dotnet/runtime/compare/1780220c9b2963e127599accc618208975c4711f...aa2d13ab1789892c9fe7c2dbcd57fea035b1c0e0)
Configs | CompilationMode:tiered, RunKind:micro


### Improvements 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_arm64_ubuntu 20.04/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=H4sIAAAAAAAACn1UXW/TMBR9r8R/8FsSSNMka7utkEldedgEZdAUeJgm5Ca3jYc/ItuhLUL8dm7SsjUdQ32pr885vuf4OhwsSQul7QcqwJCE5NTib8HBnVXyUwUVjIzVTK580qxq3L7ikduO85XJXK1NEIXBWOTDfhCHV3Fws+bBR9BLxyfOmsnuZtjvUpE7/j8I0flVFMzZCvQTCpMWeE36vKikrVA77AdjLZD1F8oRSusK6peg4RAd1+jmjLY8f0Y+OnueEJ21KYc2HhoK0urRwK4rgxWawSElBf0Dxds+1sc+OnevO1OgyAcB0prOL7IucINcVoznMygVSRLi5MpKsD2NBphAVgt1qanMiganYWl6BdDc9ARl8gg41lnBLGQWT2vg6NUhSj+z2zT6KDEH08xPs5dujQURTEEovQ3Skso3k4Lqi+A9NfZa5rC5WX6hvAI3ZT9hRAZR7D1K4dBNlFyyVaWpZUqaW2eiRMl4s5qqHJw7kvwmjmUIz50X/2Ni6R1mvmcIlmnVbnqiMDbQc1Xu/7VTmWOiqcX7IBf1u4A6YTcO45NueNqN4nl4OuqfjwaD4HTYj/rx4FUYjsLQQxFTCUE1+iNUr74JunEbwTokn7z0yGJ7dIL/EKJfO2meGuqUWt1j7k/AMzAVt4nGrnP3wMmuPsbxoitUOvFaaveKSfIdE0mYlKAPH76Sh0ANeE+a1H4zvDtL1swWxDWgGZjk4Tvgk02meCVkctzfdlc3ya4hBFpmOSTOW4wRx327X9YU4krj1TVTcmYTugHj/QFzU8avlwQAAA==>)</li></ul> | 41.83 ns | 32.35 ns | 0.77 | 0.04 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_12_2023/refs/heads/main_arm64_ubuntu%2020.04_Improvement/System.Memory.Span%28Char%29_1.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_12_2023/refs/heads/main_arm64_ubuntu%2020.04_Improvement/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-3a211097-434e-4b78-b5da-0ed6b91171a2c59147124a9420ca9/24c01d85-0c9f-426e-9796-03509a2fc8ce.zip?sv=2021-08-06&se=2023-11-01T20%3A18%3A15Z&sr=c&sp=rl&sig=AQbAY9GdN7i5zYaxAqgYe5rTCoM%2B7T1Uibe1ppw4pDQ%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-aebb0ecd-0bd3-4d3d-89f6-ba51edeb508312c6cd149b54a46bd/17150712-254d-401f-a272-1961845a89b1.zip?sv=2021-08-06&se=2023-11-03T17%3A23%3A07Z&sr=c&sp=rl&sig=l6am%2FutqLz6tHPwD%2FKy9ib4S7cdzHcIrufl9rSZJsBM%3D>)
### System.Memory.Span&lt;Char&gt;.LastIndexOfValue(Size: 512)

#### ETL Files

#### Histogram

#### Description of detection logic
```
IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsImprovementWindowed: Marked as improvement because 32.348158157051536 < 40.725728405276904.
IsChangePoint: Marked as a change because one of 5/19/2023 4:22:12 AM, 10/3/2023 10:08:56 AM, 10/11/2023 11:44:03 AM falls between 10/2/2023 7:07:56 PM and 10/11/2023 11:44:03 AM.
IsImprovementStdDev: Marked as improvement because 19.176237377028063 (T) = (0 -33.66264667592932) / Math.Sqrt((16.786924675206805 / (299)) + (0.6838122271155851 / (12))) is greater than 1.9676708853560316 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (299) + (12) - 2, .975) and 0.16079361695367744 = (40.112476925799555 - 33.66264667592932) / 40.112476925799555 is greater than 0.05.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```
#### JIT Disasms



### Docs

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

</details>


---


### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 20.04
Queue | AmpereUbuntu
Baseline | [1780220c9b2963e127599accc618208975c4711f](https://github.com/dotnet/runtime/commit/1780220c9b2963e127599accc618208975c4711f)
Compare | [aa2d13ab1789892c9fe7c2dbcd57fea035b1c0e0](https://github.com/dotnet/runtime/commit/aa2d13ab1789892c9fe7c2dbcd57fea035b1c0e0)
Diff | [Diff](https://github.com/dotnet/runtime/compare/1780220c9b2963e127599accc618208975c4711f...aa2d13ab1789892c9fe7c2dbcd57fea035b1c0e0)
Configs | CompilationMode:tiered, RunKind:micro


### Improvements in System.Collections.IndexerSet&lt;Int32&gt;

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[Dictionary - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_ubuntu 20.04/System.Collections.IndexerSet(Int32).Dictionary(Size%3a%20512).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Collections/Indexer/IndexerSet.cs#L86-#L94>)</li><li>[📈 - ADX Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 6.14 μs | 4.81 μs | 0.78 | 0.06 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_12_2023/refs/heads/main_arm64_ubuntu%2020.04_Improvement/System.Collections.IndexerSet%28Int32%29_1.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_12_2023/refs/heads/main_arm64_ubuntu%2020.04_Improvement/System.Collections.IndexerSet%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.IndexerSet&lt;Int32&gt;*'
```

<details>


### Payloads

[Baseline](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-3a211097-434e-4b78-b5da-0ed6b91171a2c59147124a9420ca9/24c01d85-0c9f-426e-9796-03509a2fc8ce.zip?sv=2021-08-06&se=2023-11-01T20%3A18%3A15Z&sr=c&sp=rl&sig=AQbAY9GdN7i5zYaxAqgYe5rTCoM%2B7T1Uibe1ppw4pDQ%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-aebb0ecd-0bd3-4d3d-89f6-ba51edeb508312c6cd149b54a46bd/17150712-254d-401f-a272-1961845a89b1.zip?sv=2021-08-06&se=2023-11-03T17%3A23%3A07Z&sr=c&sp=rl&sig=l6am%2FutqLz6tHPwD%2FKy9ib4S7cdzHcIrufl9rSZJsBM%3D>)
### System.Collections.IndexerSet&lt;Int32&gt;.Dictionary(Size: 512)

#### ETL Files

#### Histogram

#### Description of detection logic
```
IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsImprovementWindowed: Marked as improvement because 4.807104784286306 < 5.831184496006352.
IsChangePoint: Marked as a change because one of 4/25/2023 6:46:56 PM, 6/1/2023 4:59:33 PM, 7/27/2023 8:47:55 AM, 8/4/2023 10:42:53 AM, 9/20/2023 11:58:56 PM, 10/3/2023 10:08:56 AM, 10/11/2023 11:44:03 AM falls between 10/2/2023 7:07:56 PM and 10/11/2023 11:44:03 AM.
IsImprovementStdDev: Marked as improvement because 2.3107911209344083 (T) = (0 -4906.365001233121) / Math.Sqrt((343291.2765827552 / (299)) + (180966.63880442712 / (12))) is greater than 1.9676708853560316 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (299) + (12) - 2, .975) and 0.05660269721235216 = (5200.740967496183 - 4906.365001233121) / 5200.740967496183 is greater than 0.05.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```
#### JIT Disasms



### Docs

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

</details>


---


### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 20.04
Queue | AmpereUbuntu
Baseline | [1780220c9b2963e127599accc618208975c4711f](https://github.com/dotnet/runtime/commit/1780220c9b2963e127599accc618208975c4711f)
Compare | [aa2d13ab1789892c9fe7c2dbcd57fea035b1c0e0](https://github.com/dotnet/runtime/commit/aa2d13ab1789892c9fe7c2dbcd57fea035b1c0e0)
Diff | [Diff](https://github.com/dotnet/runtime/compare/1780220c9b2963e127599accc618208975c4711f...aa2d13ab1789892c9fe7c2dbcd57fea035b1c0e0)
Configs | CompilationMode:tiered, RunKind:micro


### Improvements in System.IO.MemoryMappedFiles.Tests.Perf_MemoryMappedFile

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[CreateFromFile - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_ubuntu 20.04/System.IO.MemoryMappedFiles.Tests.Perf_MemoryMappedFile.CreateFromFile(capacity%3a%2010000).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.IO.MemoryMappedFiles/Perf.MemoryMappedFile.cs#L30-#L39>)</li><li>[📈 - ADX Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 11.47 μs | 9.98 μs | 0.87 | 0.39 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_12_2023/refs/heads/main_arm64_ubuntu%2020.04_Improvement/System.IO.MemoryMappedFiles.Tests.Perf_MemoryMappedFile_1.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_12_2023/refs/heads/main_arm64_ubuntu%2020.04_Improvement/System.IO.MemoryMappedFiles.Tests.Perf_MemoryMappedFile.html>)

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

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

<details>


### Payloads

[Baseline](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-3a211097-434e-4b78-b5da-0ed6b91171a2c59147124a9420ca9/24c01d85-0c9f-426e-9796-03509a2fc8ce.zip?sv=2021-08-06&se=2023-11-01T20%3A18%3A15Z&sr=c&sp=rl&sig=AQbAY9GdN7i5zYaxAqgYe5rTCoM%2B7T1Uibe1ppw4pDQ%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-aebb0ecd-0bd3-4d3d-89f6-ba51edeb508312c6cd149b54a46bd/17150712-254d-401f-a272-1961845a89b1.zip?sv=2021-08-06&se=2023-11-03T17%3A23%3A07Z&sr=c&sp=rl&sig=l6am%2FutqLz6tHPwD%2FKy9ib4S7cdzHcIrufl9rSZJsBM%3D>)
### System.IO.MemoryMappedFiles.Tests.Perf_MemoryMappedFile.CreateFromFile(capacity: 10000)

#### ETL Files

#### Histogram

#### Description of detection logic
```
IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsImprovementWindowed: Marked as improvement because 9.980673691728125 < 11.392264305294994.
IsChangePoint: Marked as a change because one of 8/19/2023 8:04:10 PM, 10/3/2023 10:08:56 AM, 10/11/2023 11:44:03 AM falls between 10/2/2023 7:07:56 PM and 10/11/2023 11:44:03 AM.
IsImprovementStdDev: Marked as improvement because 8.323018193939433 (T) = (0 -9880.712029760152) / Math.Sqrt((749977.4473126214 / (299)) + (39934.05571246266 / (12))) is greater than 1.9676708853560316 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (299) + (12) - 2, .975) and 0.06046025894461814 = (10516.545067759647 - 9880.712029760152) / 10516.545067759647 is greater than 0.05.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```
#### JIT Disasms



### Docs

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

</details>

Name	Value
Architecture	arm64
OS	ubuntu 20.04
Queue	AmpereUbuntu
Baseline	1780220c9b2963e127599accc618208975c4711f
Compare	aa2d13ab1789892c9fe7c2dbcd57fea035b1c0e0
Diff	Diff
Configs	CompilationMode:tiered, RunKind:micro

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
AppendAsync - Duration of single invocation 📝 - Benchmark Source 📈 - ADX Test Multi Config Graph	2.74 ms	1.15 ms	0.42	0.78	False
Read - Duration of single invocation 📝 - Benchmark Source 📈 - ADX Test Multi Config Graph	5.90 μs	5.08 μs	0.86	0.60	False

[Perf] Linux/arm64: 5 Improvements on 10/4/2023 1:30:06 AM #23002

Description

Run Information

Improvements in System.IO.Tests.Perf_FileStream

Repro

Payloads

System.IO.Tests.Perf_FileStream.AppendAsync(fileSize: 1048576, userBufferSize: 4096, options: DeleteOnClose, Asynchronous)

ETL Files

Histogram

Description of detection logic

JIT Disasms

System.IO.Tests.Perf_FileStream.Read(fileSize: 1024, userBufferSize: 1024, options: None)

ETL Files

Histogram

Description of detection logic

JIT Disasms

Docs

Run Information

Improvements in System.Memory.Span<Char>

Repro

Payloads

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

ETL Files

Histogram

Description of detection logic

JIT Disasms

Docs

Run Information

Improvements in System.Collections.IndexerSet<Int32>

Repro

Payloads

System.Collections.IndexerSet<Int32>.Dictionary(Size: 512)

ETL Files

Histogram

Description of detection logic

JIT Disasms

Docs

Run Information

Improvements in System.IO.MemoryMappedFiles.Tests.Perf_MemoryMappedFile

Repro

Payloads

System.IO.MemoryMappedFiles.Tests.Perf_MemoryMappedFile.CreateFromFile(capacity: 10000)

ETL Files

Histogram

Description of detection logic

JIT Disasms

Docs

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Issue actions