From 0e832d195a2ab672ac934f198f6f761b2985e7f3 Mon Sep 17 00:00:00 2001
From: Stephan <stephane@umbraco.dk>
Date: Tue, 25 Jul 2017 13:33:32 +0200
Subject: [PATCH] Benchmark dynamic ctors

---
 src/Umbraco.Tests.Benchmarks/App.config       |   6 +-
 .../CtorInvokeBenchmarks.cs                   | 110 ++++++++++++++++++
 src/Umbraco.Tests.Benchmarks/Program.cs       |   1 +
 .../Umbraco.Tests.Benchmarks.csproj           |   1 +
 4 files changed, 116 insertions(+), 2 deletions(-)
 create mode 100644 src/Umbraco.Tests.Benchmarks/CtorInvokeBenchmarks.cs

diff --git a/src/Umbraco.Tests.Benchmarks/App.config b/src/Umbraco.Tests.Benchmarks/App.config
index d747fb6a61..7bf2e9f89d 100644
--- a/src/Umbraco.Tests.Benchmarks/App.config
+++ b/src/Umbraco.Tests.Benchmarks/App.config
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <configuration>
-    <startup> 
+    <startup>
         <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1" />
     </startup>
   <runtime>
@@ -10,7 +10,7 @@
         <assemblyIdentity name="System.Data.SqlServerCe" publicKeyToken="89845dcd8080cc91" />
         <bindingRedirect oldVersion="0.0.0.0-4.0.0.0" newVersion="4.0.0.0" />
       </dependentAssembly>
-      
+
       <dependentAssembly>
         <assemblyIdentity name="Microsoft.Owin" publicKeyToken="31bf3856ad364e35" culture="neutral" />
         <bindingRedirect oldVersion="0.0.0.0-3.0.1.0" newVersion="3.0.1.0" />
@@ -55,6 +55,7 @@
         <assemblyIdentity name="System.Collections.Immutable" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
         <bindingRedirect oldVersion="0.0.0.0-1.2.1.0" newVersion="1.2.1.0" />
       </dependentAssembly>
+      <!--
       <dependentAssembly>
         <assemblyIdentity name="System.Runtime" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
         <bindingRedirect oldVersion="0.0.0.0-4.1.0.0" newVersion="4.1.0.0" />
@@ -75,6 +76,7 @@
         <assemblyIdentity name="System.Runtime.Extensions" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
         <bindingRedirect oldVersion="0.0.0.0-4.1.0.0" newVersion="4.1.0.0" />
       </dependentAssembly>
+      -->
       <dependentAssembly>
         <assemblyIdentity name="log4net" publicKeyToken="669e0ddf0bb1aa2a" culture="neutral" />
         <bindingRedirect oldVersion="0.0.0.0-2.0.8.0" newVersion="2.0.8.0" />
diff --git a/src/Umbraco.Tests.Benchmarks/CtorInvokeBenchmarks.cs b/src/Umbraco.Tests.Benchmarks/CtorInvokeBenchmarks.cs
new file mode 100644
index 0000000000..7cce05c51d
--- /dev/null
+++ b/src/Umbraco.Tests.Benchmarks/CtorInvokeBenchmarks.cs
@@ -0,0 +1,110 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Linq.Expressions;
+using System.Reflection;
+using System.Reflection.Emit;
+using System.Text;
+using System.Threading.Tasks;
+using BenchmarkDotNet.Attributes;
+using BenchmarkDotNet.Configs;
+using BenchmarkDotNet.Diagnosers;
+using BenchmarkDotNet.Horology;
+using BenchmarkDotNet.Jobs;
+
+namespace Umbraco.Tests.Benchmarks
+{
+    [Config(typeof(Config))]
+    public class CtorInvokeBenchmarks
+    {
+        private class Config : ManualConfig
+        {
+            public Config()
+            {
+                Add(new MemoryDiagnoser());
+                //Add(ExecutionValidator.FailOnError);
+
+                //The 'quick and dirty' settings, so it runs a little quicker
+                // see benchmarkdotnet FAQ
+                Add(Job.Default
+                    .WithLaunchCount(1) // benchmark process will be launched only once
+                    .WithIterationTime(TimeInterval.FromMilliseconds(100)) // 100ms per iteration
+                    .WithWarmupCount(3) // 3 warmup iteration
+                    .WithTargetCount(3)); // 3 target iteration
+            }
+        }
+
+        private ConstructorInfo _ctorInfo;
+        private Func<IFoo, IFoo> _dynamicMethod;
+        private Func<IFoo, IFoo> _expression;
+        private IFoo _foo = new Foo(null);
+
+        [Setup]
+        public void Setup()
+        {
+            var ctorArgTypes = new[] { typeof(IFoo) };
+            var type = typeof (Foo);
+            var constructor = _ctorInfo = type.GetConstructor(ctorArgTypes);
+
+            if (constructor == null)
+                throw new Exception("Failed to get the ctor.");
+
+            //IL_0000: ldarg.0      // this
+            //IL_0001: ldfld        class Umbraco.Tests.Benchmarks.CtorInvokeBenchmarks/IFoo Umbraco.Tests.Benchmarks.CtorInvokeBenchmarks::_foo
+            //IL_0006: newobj instance void Umbraco.Tests.Benchmarks.CtorInvokeBenchmarks/Foo::.ctor(class Umbraco.Tests.Benchmarks.CtorInvokeBenchmarks/IFoo)
+            //IL_000b: pop
+            //IL_000c: ret
+
+            var meth = new DynamicMethod(string.Empty, typeof(Foo), ctorArgTypes, type.Module, true);
+            var gen = meth.GetILGenerator();
+            gen.Emit(OpCodes.Ldarg_0);
+            //gen.Emit(OpCodes.Call, constructor);
+            gen.Emit(OpCodes.Newobj, constructor);
+            gen.Emit(OpCodes.Ret);
+            _dynamicMethod = (Func<IFoo, IFoo>) meth.CreateDelegate(typeof(Func<IFoo, IFoo>));
+
+            var exprArg = Expression.Parameter(typeof(IFoo), "content");
+            var exprNew = Expression.New(constructor, exprArg);
+            var expr = Expression.Lambda<Func<IFoo, IFoo>>(exprNew, exprArg);
+            _expression = expr.Compile();
+        }
+
+        public IFoo IlCtor(IFoo foo)
+        {
+            return new Foo(foo);
+        }
+
+        [Benchmark]
+        public void DirectCtor()
+        {
+            var foo = new Foo(_foo);
+        }
+
+        [Benchmark]
+        public void InvokeCtor()
+        {
+            var foo = _ctorInfo.Invoke(new object[] { _foo });
+        }
+
+        [Benchmark]
+        public void DynamicMethodCtor()
+        {
+            var foo = _dynamicMethod(_foo);
+        }
+
+        [Benchmark]
+        public void ExpressionCtor()
+        {
+            var foo = _expression(_foo);
+        }
+
+        public interface IFoo
+        { }
+
+        public class Foo : IFoo
+        {
+            public Foo(IFoo foo)
+            { }
+        }
+    }
+}
diff --git a/src/Umbraco.Tests.Benchmarks/Program.cs b/src/Umbraco.Tests.Benchmarks/Program.cs
index 2eac9ee419..d392c09992 100644
--- a/src/Umbraco.Tests.Benchmarks/Program.cs
+++ b/src/Umbraco.Tests.Benchmarks/Program.cs
@@ -14,6 +14,7 @@ namespace Umbraco.Tests.Benchmarks
                 typeof(LinqCastBenchmarks),
                 //typeof(DeepCloneBenchmarks),
                 typeof(XmlPublishedContentInitBenchmarks),
+                typeof(CtorInvokeBenchmarks),
 
             });
             switcher.Run(args);
diff --git a/src/Umbraco.Tests.Benchmarks/Umbraco.Tests.Benchmarks.csproj b/src/Umbraco.Tests.Benchmarks/Umbraco.Tests.Benchmarks.csproj
index 5dc0d6fd3c..0a428b92e0 100644
--- a/src/Umbraco.Tests.Benchmarks/Umbraco.Tests.Benchmarks.csproj
+++ b/src/Umbraco.Tests.Benchmarks/Umbraco.Tests.Benchmarks.csproj
@@ -164,6 +164,7 @@
     </Reference>
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="CtorInvokeBenchmarks.cs" />
     <Compile Include="LinqCastBenchmarks.cs" />
     <Compile Include="ModelToSqlExpressionHelperBenchmarks.cs" />
     <Compile Include="BulkInsertBenchmarks.cs" />