benchmark prototype

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diff --git a/src/csharp/Grpc.Microbenchmarks/ThreadedBenchmark.cs b/src/csharp/Grpc.Microbenchmarks/ThreadedBenchmark.cs
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+#region Copyright notice and license
+
+// Copyright 2015, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#endregion
+
+using System;
+using System.Threading;
+using Grpc.Core;
+using Grpc.Core.Internal;
+using System.Collections.Generic;
+using System.Diagnostics;
+
+namespace Grpc.Microbenchmarks
+{
+    public class ThreadedBenchmark
+    {
+        List<ThreadStart> runners;
+
+        public ThreadedBenchmark(IEnumerable<ThreadStart> runners)
+        {
+            this.runners = new List<ThreadStart>(runners);
+        }
+
+        public ThreadedBenchmark(int threadCount, Action threadBody)
+        {
+            this.runners = new List<ThreadStart>();
+            for (int i = 0; i < threadCount; i++)
+            {
+                this.runners.Add(new ThreadStart(() => threadBody()));
+            }
+        }
+        
+        public void Run()
+        {
+            Console.WriteLine("Running threads.");
+            var threads = new List<Thread>();
+            for (int i = 0; i < runners.Count; i++)
+            {
+                var thread = new Thread(runners[i]);
+                thread.Start();
+                threads.Add(thread);
+            }
+
+            foreach (var thread in threads)
+            {
+                thread.Join();
+            }
+            Console.WriteLine("All threads finished.");
+        }
+    }
+}