Ix: Add Benchmark subproject

Ix.NET/Source/Benchmarks.System.Interactive/BenchmarkInterop.cs

@@ -0,0 +1,30 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Benchmarks.System.Interactive
+{
+    /// <summary>
+    /// Some helper extension methods to allow the same pattern to be used
+    /// in both Rx and Ix benchmarks
+    /// </summary>
+    internal static class BenchmarkInterop
+    {
+        internal static void Subscribe<T>(this IEnumerable<T> enumerable, Action<T> onNext)
+        {
+            foreach (var v in enumerable)
+            {
+                onNext(v);
+            }
+        }
+
+        internal static void Subscribe<T>(this IEnumerable<T> enumerable, Action<T> onNext, Action onCompleted)
+        {
+            foreach (var v in enumerable)
+            {
+                onNext(v);
+            }
+            onCompleted();
+        }
+    }
+}

Ix.NET/Source/Benchmarks.System.Interactive/Benchmarks.System.Interactive.csproj

@@ -0,0 +1,16 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp2.1</TargetFramework>
+    <LangVersion>latest</LangVersion>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="BenchmarkDotNet" Version="0.10.14" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\System.Interactive.Tests\System.Interactive.Tests.csproj" />
+  </ItemGroup>
+</Project>

Ix.NET/Source/Benchmarks.System.Interactive/BufferCountBenchmark.cs

@@ -0,0 +1,42 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the Apache 2.0 License.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading;
+using BenchmarkDotNet.Attributes;
+
+namespace Benchmarks.System.Interactive
+{
+    [MemoryDiagnoser]
+    public class BufferCountBenchmark
+    {
+        private IList<int> _store;
+
+        [Benchmark]
+        public void Exact()
+        {
+            Enumerable.Range(1, 1000)
+                .Buffer(1)
+                .Subscribe(v => Volatile.Write(ref _store, v));
+        }
+
+        [Benchmark]
+        public void Skip()
+        {
+            Enumerable.Range(1, 1000)
+                .Buffer(1, 2)
+                .Subscribe(v => Volatile.Write(ref _store, v));
+        }
+
+        [Benchmark]
+        public void Overlap()
+        {
+            Enumerable.Range(1, 1000)
+                .Buffer(2, 1)
+                .Subscribe(v => Volatile.Write(ref _store, v));
+        }
+    }
+}

Ix.NET/Source/Benchmarks.System.Interactive/Program.cs

@@ -0,0 +1,25 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the Apache 2.0 License.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Linq;
+using BenchmarkDotNet.Running;
+
+namespace Benchmarks.System.Interactive
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine("Effective Ix-version: " + typeof(EnumerableEx).Assembly.GetName().Version);
+
+            var switcher = new BenchmarkSwitcher(new[] {
+                typeof(BufferCountBenchmark),
+            });
+
+            switcher.Run();
+            Console.ReadLine();
+        }
+    }
+}

Ix.NET/Source/Ix.NET.sln

@@ -37,6 +37,8 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "System.Interactive", "refs\
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "System.Interactive.Providers", "refs\System.Interactive.Providers\System.Interactive.Providers.csproj", "{5DF341BE-B369-4250-AFD4-604DE8C95E45}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Benchmarks.System.Interactive", "Benchmarks.System.Interactive\Benchmarks.System.Interactive.csproj", "{3285529A-8227-4D40-B524-1A1F919F0E7B}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -75,6 +77,10 @@ Global
 		{5DF341BE-B369-4250-AFD4-604DE8C95E45}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{5DF341BE-B369-4250-AFD4-604DE8C95E45}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{5DF341BE-B369-4250-AFD4-604DE8C95E45}.Release|Any CPU.Build.0 = Release|Any CPU
+		{3285529A-8227-4D40-B524-1A1F919F0E7B}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{3285529A-8227-4D40-B524-1A1F919F0E7B}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{3285529A-8227-4D40-B524-1A1F919F0E7B}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{3285529A-8227-4D40-B524-1A1F919F0E7B}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE