Benchmarks project along with a component manager benchmark. (#251)

Content.Benchmarks/ComponentManagerGetAllComponents.cs

@@ -0,0 +1,73 @@
+using System;
+using System.Collections.Generic;
+using BenchmarkDotNet.Attributes;
+using Moq;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Interfaces.GameObjects;
+using Robust.Shared.IoC;
+
+namespace Content.Benchmarks
+{
+    public class ComponentManagerGetAllComponents
+    {
+        private readonly List<IEntity> _entities = new List<IEntity>();
+
+        private IComponentManager _componentManager;
+
+        [Params(500, 1000, 5000)] public int N { get; set; }
+
+        [GlobalSetup]
+        public void Setup()
+        {
+            // Initialize component manager.
+            IoCManager.InitThread();
+
+            IoCManager.Register<IComponentManager, ComponentManager>();
+
+            var dummyReg = new Mock<IComponentRegistration>();
+            dummyReg.SetupGet(p => p.Name).Returns("Dummy");
+            dummyReg.SetupGet(p => p.Type).Returns(typeof(DummyComponent));
+            dummyReg.SetupGet(p => p.NetID).Returns((uint?) null);
+            dummyReg.SetupGet(p => p.NetworkSynchronizeExistence).Returns(false);
+            dummyReg.SetupGet(p => p.References).Returns(new Type[] {typeof(DummyComponent)});
+
+            var componentFactory = new Mock<IComponentFactory>();
+            componentFactory.Setup(p => p.GetComponent<DummyComponent>()).Returns(new DummyComponent());
+            componentFactory.Setup(p => p.GetRegistration(It.IsAny<DummyComponent>())).Returns(dummyReg.Object);
+
+            IoCManager.RegisterInstance<IComponentFactory>(componentFactory.Object);
+
+            IoCManager.BuildGraph();
+
+            _componentManager = IoCManager.Resolve<IComponentManager>();
+
+            // Initialize N entities with one component.
+            for (var i = 0; i < N; i++)
+            {
+                var entity = new Entity();
+                entity.SetUid(new EntityUid(i + 1));
+                _entities.Add(entity);
+
+                _componentManager.AddComponent<DummyComponent>(entity);
+            }
+        }
+
+        [Benchmark]
+        public int Run()
+        {
+            var count = 0;
+
+            foreach (var _ in _componentManager.GetAllComponents<DummyComponent>())
+            {
+                count += 1;
+            }
+
+            return count;
+        }
+
+        private class DummyComponent : Component
+        {
+            public override string Name => "Dummy";
+        }
+    }
+}