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test: Tweak PerformanceMetrics tests for better CI stability #3518

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tippmar-nr merged 1 commit into from
Apr 3, 2026
+9 −0
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test: Tweak PerformanceMetrics tests for better CI stability #3518

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9 changes: 9 additions & 0 deletions ...cations/Common/MultiFunctionApplicationHelpers/NetStandardLibraries/PerformanceMetrics.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,15 @@ public static void Test(int countMaxWorkerThreads, int countMaxCompletionThreads

ThreadPool.SetMaxThreads(countMaxWorkerThreads, countMaxCompletionThreads);

// Induce Gen0-only collections BEFORE the agent starts. GCSamplerV2 reads
// cumulative GC.CollectionCount() values, so these pre-agent collections
// guarantee that CollectionCount(0) > CollectionCount(1) by the time the
// first sample runs — regardless of when the sampler fires relative to
// StartAgent(). V1 (EventListener-based) is unaffected since it only
// captures events after the listener registers inside StartAgent().
GC.Collect(0);
GC.Collect(0);

StartAgent();
}

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