Add LatencyTest project

samples/misc/LatencyTest/Program.cs

@@ -0,0 +1,46 @@
+using System;
+using System.Diagnostics;
+using System.IO;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.NodeServices;
+
+namespace ConsoleApplication
+{
+    // This project is a micro-benchmark for .NET->Node RPC via NodeServices. It doesn't reflect
+    // real-world usage patterns (you're not likely to make hundreds of sequential calls like this),
+    // but is a starting point for comparing the overhead of different hosting models and transports. 
+    public class Program
+    {
+        public static void Main(string[] args) {
+            using (var nodeServices = CreateNodeServices(NodeHostingModel.Http)) {                
+                MeasureLatency(nodeServices).Wait();
+            }
+        }
+
+        private static async Task MeasureLatency(INodeServices nodeServices) {
+            // Ensure the connection is open, so we can measure per-request timings below
+            var response = await nodeServices.Invoke<string>("latencyTest", "C#");
+            Console.WriteLine(response);
+            
+            // Now perform a series of requests, capturing the time taken
+            const int requestCount = 100;
+            var watch = Stopwatch.StartNew();
+            for (var i = 0; i < requestCount; i++) {
+                await nodeServices.Invoke<string>("latencyTest", "C#");
+            }
+
+            // Display results
+            var elapsedSeconds = (float)watch.ElapsedTicks / Stopwatch.Frequency;
+            Console.WriteLine("\nTotal time: {0:F2} milliseconds", 1000 * elapsedSeconds);
+            Console.WriteLine("\nTime per invocation: {0:F2} milliseconds", 1000 * elapsedSeconds / requestCount);
+        }
+
+        private static INodeServices CreateNodeServices(NodeHostingModel hostingModel) {
+            return Configuration.CreateNodeServices(new NodeServicesOptions {
+                HostingModel = hostingModel,
+                ProjectPath = Directory.GetCurrentDirectory(),
+                WatchFileExtensions = new string[] {} // Don't watch anything
+            });
+        }
+    }
+}