Added support for true synchronous unary call and added some performance tests.

1 files changed, 139 insertions, 0 deletions

diff --git a/src/csharp/Grpc.Core.Tests/PInvokeTest.cs b/src/csharp/Grpc.Core.Tests/PInvokeTest.cs
new file mode 100644
index 0000000000..b78609ccf0
--- /dev/null
+++ b/src/csharp/Grpc.Core.Tests/PInvokeTest.cs
@@ -0,0 +1,139 @@
+#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.Diagnostics;
+using System.Threading;
+using System.Threading.Tasks;
+using Grpc.Core;
+using Grpc.Core.Internal;
+using Grpc.Core.Utils;
+using NUnit.Framework;
+using System.Runtime.InteropServices;
+
+namespace Grpc.Core.Tests
+{
+    public class PInvokeTest
+    {
+        int counter;
+
+        [DllImport("grpc_csharp_ext.dll")]
+        static extern GRPCCallError grpcsharp_test_callback([MarshalAs(UnmanagedType.FunctionPtr)] CompletionCallbackDelegate callback);
+
+        [DllImport("grpc_csharp_ext.dll")]
+        static extern IntPtr grpcsharp_test_nop(IntPtr ptr);
+
+        [TestFixtureSetUp]
+        public void Init()
+        {
+            GrpcEnvironment.Initialize();
+        }
+
+        [TestFixtureTearDown]
+        public void Cleanup()
+        {
+            GrpcEnvironment.Shutdown();
+        }
+
+        [Test]
+        public void CompletionQueueCreateDestroyBenchmark()
+        {
+            BenchmarkUtil.RunBenchmark(
+                100000, 1000000,
+                () => {
+                    CompletionQueueSafeHandle cq = CompletionQueueSafeHandle.Create();
+                    cq.Dispose();
+                }
+            );
+        }
+
+
+        /// <summary>
+        /// Approximate results:
+        /// (mono ~80ns)
+        /// </summary>
+        [Test]
+        public void NativeCallbackBenchmark()
+        {
+            CompletionCallbackDelegate handler = Handler;
+
+            counter = 0;
+            BenchmarkUtil.RunBenchmark(
+                1000000, 10000000,
+                () => {
+                    grpcsharp_test_callback(handler);
+                }
+            );
+            Assert.AreNotEqual(0, counter);
+        }
+
+        /// <summary>
+        /// Creating a new native-to-managed callback has significant overhead
+        /// compared to using an existing one. We need to be aware of this.
+        /// (~50us on mono)
+        /// </summary>
+        [Test]
+        public void NewNativeCallbackBenchmark()
+        {
+            counter = 0;
+            BenchmarkUtil.RunBenchmark(
+                10000, 10000,
+                () => {
+                grpcsharp_test_callback(new CompletionCallbackDelegate(Handler));
+            }
+            );
+            Assert.AreNotEqual(0, counter);
+        }
+
+        /// <summary>
+        /// Tests overhead of a simple PInvoke call.
+        /// </summary>
+        [Test]
+        public void NopPInvokeBenchmark()
+        {
+            CompletionCallbackDelegate handler = Handler;
+
+            BenchmarkUtil.RunBenchmark(
+                1000000, 100000000,
+                () => {
+                    grpcsharp_test_nop(IntPtr.Zero);
+                }
+            );
+        }
+
+        private void Handler(GRPCOpError op, IntPtr ptr) {
+            counter ++;
+        }
+    }
+}
+