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Roselyn CTP vs. Microsoft.CSharp (C# native compiler)

, 4 Sep 2012 CPOL
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Comparison between the new Roselyn CTP compiler from Microsoft and the native C# compiler which is integrated into .NET.

Here is a small comparison between the new Roselyn CTP compiler from Microsoft ( and the native C# compiler which is integrated into .NET.

Here is the code used for testing compilation between the "two" compilers:

static class Program
    static void Main()
        int pass = 50;
        List<long> rList = new List<long>();
        List<long> oList = new List<long>();
        for (int i = 1; i < pass; i++)
            long roselynVal = TestRoselyn();
            long oldVal = TestOld();
            Console.WriteLine("Roselyn Pass " + i + ":  " + roselynVal.ToString() + 
                     "\t\tOld Microsoft compiler Pass " + i + ":  " + oldVal.ToString());
        var rosleynAvg = rList.Average();
        var oldAvg = oList.Average();
        //var rAvg = from r in rList
        Console.WriteLine("Roselyn average ms:\t" + rosleynAvg);
        Console.WriteLine("Microsoft old compiler average ms:\t" + oldAvg);
    /// <summary>
    /// Test roselyn
    /// </summary>
    /// <returns></returns>
    private static long TestRoselyn()
        //Crate stopwatch and evaluate script using Roselyn
        Stopwatch sw = new Stopwatch();
        var engine = new ScriptEngine();
        var result = engine.Execute<bool>("var x = 10; x == 10");
        return sw.ElapsedMilliseconds;
    /// <summary>
    /// Test old one
    /// </summary>
    /// <returns></returns>
    private static long TestOld()
        Stopwatch sw2 = new Stopwatch();
        Microsoft.CSharp.CSharpCodeProvider cp = new CSharpCodeProvider();
        CompilerParameters cparam = new CompilerParameters { GenerateInMemory = true };
        CompilerResults cr = cp.CompileAssemblyFromSource(cparam,
           "namespace RoselynTemplate { class Main { public bool " + 
           "GetSmt() { var x = 10; return x == 10; } }}");
        var instance = cr.CompiledAssembly.CreateInstance("RoselynTemplate.Main");
        var method = instance.GetType().GetMethod("GetSmt");
        object res = method.Invoke(instance, null);
        return sw2.ElapsedMilliseconds;

And here are the test results:

Considering code execution, it seems that Roselyn uses some kind of caching mechanism, also I need to mention that every time at “Pass 1” the old Microsoft compiler has beaten Roselyn by 6-7ms which I presume is spent on caching and other operations.


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


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Comments and Discussions

GeneralMy vote of 2 Pin
John B Oliver2-Oct-12 13:00
memberJohn B Oliver2-Oct-12 13:00 
GeneralRe: My vote of 2 Pin
Djenad3-Oct-12 4:46
memberDjenad3-Oct-12 4:46 

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