[Perf] Linux/x64: 2 Regressions on 2/20/2024 7:35:45 PM

[performanceautofiler]

Run Information

Name	Value
Architecture	x64
OS	ubuntu 22.04
Queue	TigerUbuntu
Baseline	9dc6ea62a4d195ae4559f4609a56933c61889756
Compare	11bdd1b9fc38e137d7945c66790d05b0cd1966ab
Diff	Diff
Configs	CompilationMode:tiered, RunKind:micro

Regressions in System.Memory.Span<Byte>

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
EndsWith - Duration of single invocation 📝 - Benchmark Source 📈 - ADX Test Multi Config Graph	1.92 ns	4.27 ns	2.22	0.06	False
EndsWith - Duration of single invocation 📝 - Benchmark Source 📈 - ADX Test Multi Config Graph	1.43 ns	2.98 ns	2.08	0.05	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
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Memory.Span<Byte>*'

Payloads

Baseline
Compare

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

ETL Files

Histogram

JIT Disasms

System.Memory.Span<Byte>.EndsWith(Size: 4)

ETL Files

Histogram

JIT Disasms

Docs

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

[ghost]

Tagging subscribers to this area: @dotnet/area-system-memory
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Issue Details

---

Run Information

Name	Value
Architecture	x64
OS	ubuntu 22.04
Queue	TigerUbuntu
Baseline	9dc6ea62a4d195ae4559f4609a56933c61889756
Compare	11bdd1b9fc38e137d7945c66790d05b0cd1966ab
Diff	Diff
Configs	CompilationMode:tiered, RunKind:micro

Regressions in System.Memory.Span<Byte>

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
EndsWith - Duration of single invocation 📝 - Benchmark Source 📈 - ADX Test Multi Config Graph	1.92 ns	4.27 ns	2.22	0.06	False
EndsWith - Duration of single invocation 📝 - Benchmark Source 📈 - ADX Test Multi Config Graph	1.43 ns	2.98 ns	2.08	0.05	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
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Memory.Span<Byte>*'

Payloads

Baseline
Compare

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

ETL Files

Histogram

JIT Disasms

System.Memory.Span<Byte>.EndsWith(Size: 4)

ETL Files

Histogram

JIT Disasms

Docs

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

Author:	performanceautofiler[bot]
Assignees:	-
Labels:	area-System.Memory, os-linux, arch-x64, untriaged, runtime-coreclr, PGO
Milestone:	-

[DrewScoggins]

Related to #98593

[DrewScoggins]

Windows regressions:

• [Perf] Windows/x64: 2 Regressions on 2/20/2024 7:35:45 PM perf-autofiling-issues#29797
• [Perf] Windows/x64: 5 Regressions on 2/25/2024 4:37:10 PM perf-autofiling-issues#29801

arm64:

• [Perf] Windows/arm64: 3 Regressions on 2/20/2024 7:35:45 PM perf-autofiling-issues#30148

[stephentoub]

cc: @EgorBo

[tannergooding]

This is at worst a 1.6ns regression and has normalized much closer to 1ns.

The improvements were much more meaningful, so closing this as by design.