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[Perf] Linux/x64: 7 Regressions on 6/27/2025 11:05:34 AM +00:00 #117203

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#117549
Closed
[Perf] Linux/x64: 7 Regressions on 6/27/2025 11:05:34 AM +00:00#117203
#117549
Labels
arch-x64area-System.Diagnostics.Tracingos-linuxLinux OS (any supported distro)runtime-coreclrspecific to the CoreCLR runtimetenet-performancePerformance related issuetenet-performance-benchmarksIssue from performance benchmark

Description

@performanceautofiler
performanceautofiler
bot
opened on Jul 1, 2025

Run Information

Name Value
Architecture x64
OS ubuntu 22.04
Queue TigerUbuntu
Baseline a0c5625a8db02927113b66e776dbb670099acfbd
Compare d38966ff663cb279148a82d1d0364dee40727f88
Diff Diff
Configs CompilationMode:tiered, RunKind:micro

Regressions in Microsoft.Extensions.Logging.EventSourceLogger

Benchmark Baseline Test Test/Base Test Quality Edge Detector Baseline IR Compare IR IR Ratio
1.98 μs 3.14 μs 1.58 0.03 False
2.00 μs 3.22 μs 1.61 0.04 False

graph
graph
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 'Microsoft.Extensions.Logging.EventSourceLogger*'
Details

Microsoft.Extensions.Logging.EventSourceLogger.NestedScopes_TwoMessages(HasSubscribers: True, Json: True)

ETL Files

Histogram

JIT Disasms

Microsoft.Extensions.Logging.EventSourceLogger.NestedScopes_TwoMessages(HasSubscribers: True, Json: False)

ETL Files

Histogram

JIT Disasms

Docs

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

Run Information

Name Value
Architecture x64
OS ubuntu 22.04
Queue TigerUbuntu
Baseline a0c5625a8db02927113b66e776dbb670099acfbd
Compare d38966ff663cb279148a82d1d0364dee40727f88
Diff Diff
Configs CompilationMode:tiered, RunKind:micro

Regressions in System.Diagnostics.Tracing.Perf_EventListener

Benchmark Baseline Test Test/Base Test Quality Edge Detector Baseline IR Compare IR IR Ratio
30.87 ns 41.17 ns 1.33 0.13 False
75.65 ns 88.72 ns 1.17 0.12 False
78.19 ns 89.73 ns 1.15 0.06 False
61.55 ns 71.05 ns 1.15 0.11 False

graph
graph
graph
graph
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.Diagnostics.Tracing.Perf_EventListener*'
Details

System.Diagnostics.Tracing.Perf_EventListener.WriteEvent_NoParams

ETL Files

Histogram

JIT Disasms

System.Diagnostics.Tracing.Perf_EventListener.WriteEvent_MixedParams

ETL Files

Histogram

JIT Disasms

System.Diagnostics.Tracing.Perf_EventListener.WriteEvent_StringParams

ETL Files

Histogram

JIT Disasms

System.Diagnostics.Tracing.Perf_EventListener.WriteEvent_IntParams

ETL Files

Histogram

JIT Disasms

Docs

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

Run Information

Name Value
Architecture x64
OS ubuntu 22.04
Queue TigerUbuntu
Baseline a0c5625a8db02927113b66e776dbb670099acfbd
Compare d38966ff663cb279148a82d1d0364dee40727f88
Diff Diff
Configs CompilationMode:tiered, RunKind:micro

Regressions in System.Diagnostics.Perf_EventSource

Benchmark Baseline Test Test/Base Test Quality Edge Detector Baseline IR Compare IR IR Ratio
106.76 ns 127.21 ns 1.19 0.07 False

graph
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.Diagnostics.Perf_EventSource*'
Details

System.Diagnostics.Perf_EventSource.Log

ETL Files

Histogram

JIT Disasms

Docs

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

Activity

  1. performanceautofiler
    added
    arch-x64
    os-linuxLinux OS (any supported distro)
    runtime-coreclrspecific to the CoreCLR runtime
    untriagedNew issue has not been triaged by the area owner
    on Jul 1, 2025
  2. LoopedBard3
    transferred this issue fromdotnet/perf-autofiling-issueson Jul 1, 2025
  3. github-actions
    added
    needs-area-labelAn area label is needed to ensure this gets routed to the appropriate area owners
    on Jul 1, 2025

  4. LoopedBard3 commented on Jul 1, 2025

    @LoopedBard3
    LoopedBard3
    on Jul 1, 2025
    Member

    Caused by: #117031. Seems like it may already be reverted 2ea2bce.

    Related Regressions:

  5. LoopedBard3
    added
    tenet-performancePerformance related issue
    tenet-performance-benchmarksIssue from performance benchmark
    and removed
    needs-area-labelAn area label is needed to ensure this gets routed to the appropriate area owners
    on Jul 1, 2025
  6. jeffschwMSFT
    added
    area-System.Diagnostics.Tracing
    on Jul 7, 2025

  7. dotnet-policy-service commented on Jul 7, 2025

    @dotnet-policy-service
    dotnet-policy-serviceBot
    on Jul 7, 2025 – with Dotnet Policy Service
    Contributor

    Tagging subscribers to this area: @tarekgh, @tommcdon, @steveisok, @pjanotti
    See info in area-owners.md if you want to be subscribed.

  8. tarekgh commented on Jul 7, 2025

    @tarekgh
    tarekgh
    on Jul 7, 2025
    Member

    CC @jkotas @noahfalk

  9. jkotas commented on Jul 7, 2025

    @jkotas
    jkotas
    on Jul 7, 2025
    Member

    cc @rcj1

  10. rcj1 commented on Jul 11, 2025

    @rcj1
    rcj1
    on Jul 11, 2025
    Contributor

    Initial investigation into the NestedScopes tests show that the TraceLoggingEventTypes constructor appears to be responsible for approximately half of the performance degradation. Still looking into the root cause of this.

  11. rcj1 commented on Jul 12, 2025

    @rcj1
    rcj1
    on Jul 12, 2025
    Contributor

    The issue was related to accessing EventMetadata by reference vs by value.

  12. rcj1
    closed this as completedin #117549on Jul 14, 2025
  13. dotnet-policy-service
    removed
    untriagedNew issue has not been triaged by the area owner
    on Jul 14, 2025
  14. github-actions
    locked and limited conversation to collaborators on Aug 14, 2025
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