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Disable tiered compilation in integration tests #7549

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Disable tiered compilation in integration tests #7549

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16 changes: 16 additions & 0 deletions ...Tests/Microsoft.Testing.Platform.Acceptance.IntegrationTests/Helpers/AcceptanceFixture.cs
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Expand Up @@ -13,6 +13,22 @@ public static void AssemblyInitialize(TestContext context)
{
NuGetGlobalPackagesFolder = new(".packages");
Environment.SetEnvironmentVariable("MSBUILDDISABLENODEREUSE", "1");

// Our MSTest/MTP integration tests run lots of builds via 'dotnet build' in child processes.
// Profiling that, we noticed lots of time is spent jitting.
// In one of the investigated occurrences, we saw this data:
// Process CPU time 21.11 seconds.
// 58.2% of that is jitting, which is roughly 12.28 seconds.
// From the trace:
// - Jitting trigger: Foreground -> 2.65 seconds.
// - Jitting trigger: Tiered Compilation Background -> 9.63 seconds
//
// Above was running:
// <RepoRoot>/.dotnet/dotnet.exe" build <RepoRoot>\artifacts\tmp\Debug\testsuite\Umx6q\DataRowTests -c Release -p:MSBuildTreatWarningsAsErrors=true -p:TreatWarningsAsErrors=true -p:SuppressNETCoreSdkPreviewMessage=true -bl:"<RepoRoot>\artifacts\tmp\Debug\testsuite\DataRowTests-87.binlog
//
// The whole MSTest.Acceptance.IntegrationTests run when running with tiered compilation enabled locally was roughly 30 minutes.
// After disabling tiered compilation, it went down to 20 minutes locally.
Environment.SetEnvironmentVariable("DOTNET_TieredCompilation", "0");
}

[AssemblyCleanup]
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