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PORun dynamically compiled C# code at native speed... how?
 

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  1. PORun dynamically compiled C# code at native speed... how?
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    <p>I have read several posts on SO about writing and compiling dynamic C# code. For example, <a href="https://stackoverflow.com/questions/3188882/compile-and-run-dynamic-code-without-generating-exe">this post</a>. I understand it can be done several ways.</p> <p>However, calling the code invoker is slow. I did a simple benchmark, and it's some 500 X slower than calling a native method.</p> <p>What I want to be able to do is the equivalent of loading a DLL and calling one of its methods directly ("natively"), which will give the speed benefits I want.</p> <p>What is the easiest way to go about this? Compile the dynamic code to a dll and then load it? Can it be done in memory?</p> <p><strong>EDIT</strong></p> <p>I don't care about compilation time. Only execution.</p> <p><strong>EDIT 2, 3</strong></p> <p>Here is the benchmark code I wrote:</p> <pre><code> public static int Execute(int i) { return i * 2; } private void button30_Click(object sender, EventArgs e) { CSharpCodeProvider foo = new CSharpCodeProvider(); var res = foo.CompileAssemblyFromSource( new System.CodeDom.Compiler.CompilerParameters() { GenerateInMemory = true, CompilerOptions = @"/optimize", }, @"public class FooClass { public static int Execute(int i) { return i * 2; }}" ); var type = res.CompiledAssembly.GetType("FooClass"); var obj = Activator.CreateInstance(type); var method = type.GetMethod("Execute"); int i = 0, t1 = Environment.TickCount, t2; //var input = new object[] { 2 }; //for (int j = 0; j &lt; 10000000; j++) //{ // input[0] = j; // var output = method.Invoke(obj, input); // i = (int)output; //} //t2 = Environment.TickCount; //MessageBox.Show((t2 - t1).ToString() + Environment.NewLine + i.ToString()); t1 = Environment.TickCount; for (int j = 0; j &lt; 100000000; j++) { i = Execute(j); } t2 = Environment.TickCount; MessageBox.Show("Native: " + (t2 - t1).ToString() + Environment.NewLine + i.ToString()); var func = (Func&lt;int, int&gt;) Delegate.CreateDelegate(typeof (Func&lt;int, int&gt;), method); t1 = Environment.TickCount; for (int j = 0; j &lt; 100000000; j++) { i = func(j); } t2 = Environment.TickCount; MessageBox.Show("Dynamic delegate: " + (t2 - t1).ToString() + Environment.NewLine + i.ToString()); Func&lt;int, int&gt; funcL = Execute; t1 = Environment.TickCount; for (int j = 0; j &lt; 100000000; j++) { i = funcL(j); } t2 = Environment.TickCount; MessageBox.Show("Delegate: " + (t2 - t1).ToString() + Environment.NewLine + i.ToString()); } </code></pre>
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    1. COHave you taken into account the compilation time? how does your benchmark look?
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    2. COexecuting C# build runtime is not 500x times slower than executing C# build prior. They are identical however there's overheads to be considered. What's your benchmark like, are you using Reflection.Emit or some compiler service to compile?
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    3. COThe Invoke is what's slow, which is the center of my question: how can you call the method at native speed?
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