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Merged
sbomer merged 2 commits into from
Aug 26, 2026
Merged

Improve ILLink test parallelism #132755

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a327bbf
Improve ILLink test parallelism
sbomer Aug 25, 2026
75bae38
Address ILLink parallel test feedback
sbomer Aug 25, 2026
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31 changes: 24 additions & 7 deletions src/tools/illink/test/Mono.Linker.Tests/TestCases/TestDatabase.cs
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
// Copyright (c) .NET Foundation and contributors. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
Expand All @@ -11,7 +12,10 @@ namespace Mono.Linker.Tests.TestCases
{
public static class TestDatabase
{
private static TestCase[] _cachedAllCases;
private static readonly Lazy<TestCase[]> s_allCases = new(() => CreateCollector()
.Collect()
.OrderBy(c => c.DisplayName)
.ToArray());

public static IEnumerable<object[]> AdvancedTests()
{
Expand All @@ -28,6 +32,12 @@ public static IEnumerable<object[]> AttributeTests()
return TestCasesBySuiteName("Attributes");
}

public static IEnumerable<object[]> AttributeTestsShard(int shardIndex, int shardCount)
{
return TestCasesBySuiteName("Attributes")
.Where((_, index) => index % shardCount == shardIndex);
}
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public static IEnumerable<object[]> AttributesStructLayoutTests()
{
return TestCasesBySuiteName("Attributes.StructLayout");
Expand Down Expand Up @@ -73,6 +83,12 @@ public static IEnumerable<object[]> DataFlowTests()
return TestCasesBySuiteName("DataFlow");
}

public static IEnumerable<object[]> DataFlowTestsShard(int shardIndex, int shardCount)
{
return TestCasesBySuiteName("DataFlow")
.Where((_, index) => index % shardCount == shardIndex);
}

public static IEnumerable<object[]> DynamicDependenciesTests()
{
return TestCasesBySuiteName("DynamicDependencies");
Expand Down Expand Up @@ -113,6 +129,12 @@ public static IEnumerable<object[]> InheritanceInterfaceTests()
return TestCasesBySuiteName("Inheritance.Interfaces");
}

public static IEnumerable<object[]> InheritanceInterfaceTestsShard(int shardIndex, int shardCount)
{
return TestCasesBySuiteName("Inheritance.Interfaces")
.Where((_, index) => index % shardCount == shardIndex);
}

public static IEnumerable<object[]> InheritanceVirtualMethodsTests()
{
return TestCasesBySuiteName("Inheritance.VirtualMethods");
Expand Down Expand Up @@ -265,12 +287,7 @@ public static NPath TestCasesRootDirectory

static IEnumerable<TestCase> AllCases()
{
_cachedAllCases ??= CreateCollector()
.Collect()
.OrderBy(c => c.DisplayName)
.ToArray();

return _cachedAllCases;
return s_allCases.Value;
}

static IEnumerable<object[]> TestCasesBySuiteName(string suiteName)
Expand Down
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