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17822551
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2013-07-23T23:12:39.353
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2013-07-23T23:18:50.307
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2013-07-23T23:18:50.307
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I think one issue is using a memory stream, instead you should try using a dynamic module and ModuleBuilder instead. Overall the code is executing faster but still has a heavier first load scenario. I'm pretty new to Roslyn myself so I'm not sure why this is faster but here is the changed code. <pre><code> var iters = 300; foreach (var i in Enumerable.Range(0, iters)) { // Parse the source file using Roslyn SyntaxTree syntaxTree = SyntaxTree.ParseText(@"public class Foo" + i + @" { public void Exec() { } }"); // Add all the references we need for the compilation var references = new List<MetadataReference>(); references.Add(new MetadataFileReference(typeof(int).Assembly.Location)); var compilationOptions = new CompilationOptions(outputKind: OutputKind.DynamicallyLinkedLibrary); // Note: using a fixed assembly name, which doesn't matter as long as we don't expect cross references of generated assemblies var compilation = Compilation.Create("SomeAssemblyName", compilationOptions, new[] { syntaxTree }, references); var assemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(new System.Reflection.AssemblyName("CustomerA"), System.Reflection.Emit.AssemblyBuilderAccess.RunAndCollect); var moduleBuilder = assemblyBuilder.DefineDynamicModule("MyModule"); System.Diagnostics.Stopwatch watch = new System.Diagnostics.Stopwatch(); watch.Start(); // if we comment out from this line and down, the runtime drops to ~.5 seconds var emitResult = compilation.Emit(moduleBuilder); watch.Stop(); System.Diagnostics.Debug.WriteLine(watch.ElapsedMilliseconds); if (emitResult.Diagnostics.LongCount() == 0) { var type = moduleBuilder.GetTypes().Single(t => t.Name == "Foo" + i); System.Diagnostics.Debug.Write(type != null); } } </code></pre> By using this technique the compilation took just 96 milliseconds, on subsequent iterations it takes around 3 - 15ms. So I think you could be right in terms of the first load scenario adding some overhead. Sorry I can't explain why it's faster! I'm just researching Roslyn myself and will do more digging later tonight to see if I can find any more evidence of what the ModuleBuilder provides over the memorystream.
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