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feat: add ConfigureThreadPool method to optimize parallel test execution #3650

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Merged
thomhurst merged 1 commit into from
Nov 2, 2025
Merged

feat: add ConfigureThreadPool method to optimize parallel test execution #3650

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13 changes: 13 additions & 0 deletions TUnit.Engine/TUnitInitializer.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,7 @@ public void Initialize(ExecuteRequestContext context)
{
ConfigureGlobalExceptionHandlers(context);
SetUpExceptionListeners();
ConfigureThreadPool();
ParseParameters();

// Discover hooks using the mode-specific service
Expand Down Expand Up @@ -54,6 +55,18 @@ private void ParseParameters()
}
}

private void ConfigureThreadPool()
{
// Optimize ThreadPool for parallel test execution
// This eliminates the default ~500ms thread injection delay when running many tests in parallel
// Users can call ThreadPool.SetMinThreads() in their test setup to override if needed
var processorCount = Environment.ProcessorCount;
var minWorkerThreads = Math.Max(processorCount * 4, 32);
var minIocpThreads = Math.Max(processorCount * 4, 32);

ThreadPool.SetMinThreads(minWorkerThreads, minIocpThreads);
}

private static void ConfigureGlobalExceptionHandlers(ExecuteRequestContext context)
{
// Handle unhandled exceptions on any thread
Expand Down
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