a test for lock performance

tests/MiniProfiler.Tests/LockPerformanceTest.cs

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+using System;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+using Xunit;
+using Xunit.Abstractions;
+
+namespace StackExchange.Profiling.Tests
+{
+    public class LockPerformanceTest
+    {
+        private readonly ITestOutputHelper _output;
+
+        public LockPerformanceTest(ITestOutputHelper output)
+        {
+            _output = output;
+        }
+
+        [Fact]
+        public void LockPerformance()
+        {
+
+            var time = new Stopwatch();
+
+            var list1 = new List<int>();
+            time.Start();
+            for (int i = 0; i < 1000000; i++)
+            {
+                list1.Add(i);
+            }
+            time.Stop();
+            _output.WriteLine("output");
+            _output.WriteLine($"Without locks took: {time.Elapsed.TotalMilliseconds}ms");
+
+            list1 = new List<int>();
+            time.Restart();
+            for (int i = 0; i < 1000000; i++)
+            {
+                lock(list1)
+                    list1.Add(i);
+            }
+            time.Stop();
+
+            _output.WriteLine("output");
+            _output.WriteLine($"With lock took: {time.Elapsed.TotalMilliseconds}ms");
+
+            list1 = new List<int>();
+            var spinLock = new SpinLock(enableThreadOwnerTracking: false);
+            time.Restart();
+            for (int i = 0; i < 1000000; i++)
+            {
+                var locked = false;
+                spinLock.Enter(ref locked);
+                if (!locked)
+                    throw new Exception("didn't lock");
+                try
+                {
+                    list1.Add(i);
+                }
+                finally
+                {
+                    if (locked)
+                        spinLock.Exit();
+                }
+            }
+            time.Stop();
+
+            _output.WriteLine("output");
+            _output.WriteLine($"With spinlock took: {time.Elapsed.TotalMilliseconds}ms");
+
+            var list2 = new ConcurrentQueue<int>();
+            time.Restart();
+            for (int i = 0; i < 1000000; i++)
+            {
+                list2.Enqueue(i);
+            }
+            time.Stop();
+            _output.WriteLine("output");
+            _output.WriteLine($"With concurrent took: {time.Elapsed.TotalMilliseconds}ms");
+        }
+    }
+}