Updated logging benchmarks to include source generation (#2800)

Author: cijothomas

test/Benchmarks/Logs/Food.cs

@@ -0,0 +1,30 @@
+// <copyright file="Food.cs" company="OpenTelemetry Authors">
+// Copyright The OpenTelemetry Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// </copyright>
+
+using Microsoft.Extensions.Logging;
+
+namespace Benchmarks.Logs
+{
+    public static partial class Food
+    {
+        [LoggerMessage(
+            EventId = 0,
+            Level = LogLevel.Information,
+            Message = "Hello from {food} {price}.")]
+        public static partial void SayHello(
+            ILogger logger, string food, double price);
+    }
+}

test/Benchmarks/Logs/LogBenchmarks.cs

@@ -19,6 +19,26 @@
 using OpenTelemetry;
 using OpenTelemetry.Logs;
 
+/*
+// * Summary *
+
+BenchmarkDotNet=v0.13.1, OS=Windows 10.0.19044.1466 (21H2)
+Intel Core i7-4790 CPU 3.60GHz (Haswell), 1 CPU, 8 logical and 4 physical cores
+.NET SDK=6.0.101
+  [Host]     : .NET 6.0.1 (6.0.121.56705), X64 RyuJIT
+  DefaultJob : .NET 6.0.1 (6.0.121.56705), X64 RyuJIT
+
+
+|                                 Method |       Mean |     Error |    StdDev |  Gen 0 | Allocated |
+|--------------------------------------- |-----------:|----------:|----------:|-------:|----------:|
+|                             NoListener |  72.365 ns | 0.9425 ns | 0.8817 ns | 0.0153 |      64 B |
+|   NoListenerWithLoggerMessageGenerator |   4.769 ns | 0.0161 ns | 0.0142 ns |      - |         - |
+|                           OneProcessor | 168.330 ns | 0.6198 ns | 0.5494 ns | 0.0553 |     232 B |
+| OneProcessorWithLoggerMessageGenerator | 142.898 ns | 0.5233 ns | 0.4086 ns | 0.0401 |     168 B |
+|                          TwoProcessors | 173.727 ns | 0.5978 ns | 0.4992 ns | 0.0553 |     232 B |
+|                        ThreeProcessors | 174.295 ns | 0.7697 ns | 0.7200 ns | 0.0553 |     232 B |
+*/
+
 namespace Benchmarks.Logs
 {
     [MemoryDiagnoser]
@@ -62,25 +82,37 @@ public LogBenchmarks()
         [Benchmark]
         public void NoListener()
         {
-            this.loggerWithNoListener.LogInformation("Hello, World!");
+            this.loggerWithNoListener.LogInformation("Hello from {name} {price}.", "tomato", 2.99);
+        }
+
+        [Benchmark]
+        public void NoListenerWithLoggerMessageGenerator()
+        {
+            Food.SayHello(this.loggerWithNoListener, "tomato", 2.99);
         }
 
         [Benchmark]
         public void OneProcessor()
         {
-            this.loggerWithOneProcessor.LogInformation("Hello, World!");
+            this.loggerWithOneProcessor.LogInformation("Hello from {name} {price}.", "tomato", 2.99);
+        }
+
+        [Benchmark]
+        public void OneProcessorWithLoggerMessageGenerator()
+        {
+            Food.SayHello(this.loggerWithOneProcessor, "tomato", 2.99);
         }
 
         [Benchmark]
         public void TwoProcessors()
         {
-            this.loggerWithTwoProcessors.LogInformation("Hello, World!");
+            this.loggerWithTwoProcessors.LogInformation("Hello from {name} {price}.", "tomato", 2.99);
         }
 
         [Benchmark]
         public void ThreeProcessors()
         {
-            this.loggerWithThreeProcessors.LogInformation("Hello, World!");
+            this.loggerWithThreeProcessors.LogInformation("Hello from {name} {price}.", "tomato", 2.99);
         }
 
         internal class DummyLogProcessor : BaseProcessor<LogRecord>