[Perf] Windows/x64: 9 Regressions on 3/10/2026 8:09:51 PM +00:00

[performanceautofiler]

Run Information

Name	Value
Architecture	x64
OS	Windows 10.0.22631
Queue	ViperWindows
Baseline	68de53c1ec0e6cc230dc8da5a54e11e03edbd37c
Compare	1e1bbed9856fd11f562d5e5b23b43b938e23f437
Diff	Diff
Configs	CompilationMode:tiered, RunKind:micro

Regressions in System.IO.Tests.Perf_FileStream

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
Write - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	95.40 μs	105.21 μs	1.10	0.45	False
ReadByte - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	15.19 μs	17.84 μs	1.17	0.13	False
Read - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	12.30 μs	15.35 μs	1.25	0.16	False
SeekForward - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	14.61 μs	17.78 μs	1.22	0.09	False
SeekBackward - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	16.17 μs	19.20 μs	1.19	0.08	False
Read - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	19.11 μs	21.68 μs	1.13	0.28	False
LockUnlock - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	18.88 μs	22.44 μs	1.19	0.29	False
LockUnlock - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	15.58 μs	18.38 μs	1.18	0.33	False
ReadByte - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	20.41 μs	23.83 μs	1.17	0.11	False

Test Report

Repro

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

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

Details

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

ETL Files

Histogram

JIT Disasms

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

ETL Files

Histogram

JIT Disasms

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

ETL Files

Histogram

JIT Disasms

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

ETL Files

Histogram

JIT Disasms

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

ETL Files

Histogram

JIT Disasms

System.IO.Tests.Perf_FileStream.Read(fileSize: 1024, userBufferSize: 1024, options: Asynchronous)

ETL Files

Histogram

JIT Disasms

System.IO.Tests.Perf_FileStream.LockUnlock(fileSize: 1024, options: Asynchronous)

ETL Files

Histogram

JIT Disasms

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

ETL Files

Histogram

JIT Disasms

System.IO.Tests.Perf_FileStream.ReadByte(fileSize: 1024, options: Asynchronous)

ETL Files

Histogram

JIT Disasms

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

[DrewScoggins]

This is the range of commits over the regression, 0d0e129...6b6bfe3.

I suspect it is related to #124561

More regressions:

• [Perf] Windows/x64: 11 Regressions on 3/9/2026 5:24:50 PM +00:00 perf-autofiling-issues#70148

[dotnet-policy-service]

Tagging subscribers to this area: @dotnet/area-system-io
See info in area-owners.md if you want to be subscribed.