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Reduce test wall-clock time by increasing minThreads #15502

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Merged
nohwnd merged 1 commit into from
Mar 18, 2026
Merged

Reduce test wall-clock time by increasing minThreads #15502

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8 changes: 8 additions & 0 deletions test/Microsoft.TestPlatform.Acceptance.IntegrationTests/Build.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,14 @@ public class Build : IntegrationTestBase
[AssemblyInitialize]
public static void AssemblyInitialize(TestContext testContext)
{
// Increase the ThreadPool minimum threads to avoid starvation during parallel test
// execution. Each test class spawns vstest.console and testhost processes — the async
// process management and I/O redirection callbacks need ThreadPool threads to complete
// promptly.
var additionalThreadsCount = System.Environment.ProcessorCount * 4;
System.Threading.ThreadPool.GetMinThreads(out var workerThreads, out var completionPortThreads);
System.Threading.ThreadPool.SetMinThreads(workerThreads + additionalThreadsCount, completionPortThreads + additionalThreadsCount);

IntegrationTestBuild.BuildTestAssetsForIntegrationTests(testContext);
}
}
8 changes: 8 additions & 0 deletions test/Microsoft.TestPlatform.Library.IntegrationTests/Build.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,14 @@ public class Build : IntegrationTestBase
[AssemblyInitialize]
public static void AssemblyInitialize(TestContext testContext)
{
// Increase the ThreadPool minimum threads to avoid starvation during parallel test
// execution. Each test class spawns vstest.console and testhost processes via the
// TranslationLayer — the socket-based communication blocks ThreadPool threads during
// connection setup, causing starvation with the default MinThreads.
var additionalThreadsCount = System.Environment.ProcessorCount * 4;
System.Threading.ThreadPool.GetMinThreads(out var workerThreads, out var completionPortThreads);
System.Threading.ThreadPool.SetMinThreads(workerThreads + additionalThreadsCount, completionPortThreads + additionalThreadsCount);

IntegrationTestBuild.BuildTestAssetsForIntegrationTests(testContext);
}
}
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