Add benchmarks for array, span, and string pinningpinning_benchmarks

3 files changed, 74 insertions, 0 deletions

diff --git a/sandbox/PerfBenchmarkDotNet/PerfBenchmarkDotNet.csproj b/sandbox/PerfBenchmarkDotNet/PerfBenchmarkDotNet.csproj
index 1ec7105e..a727c4c1 100644
--- a/sandbox/PerfBenchmarkDotNet/PerfBenchmarkDotNet.csproj
+++ b/sandbox/PerfBenchmarkDotNet/PerfBenchmarkDotNet.csproj
@@ -2,6 +2,7 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <TargetFrameworks>net47;netcoreapp2.0</TargetFrameworks>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
   </PropertyGroup>
   <ItemGroup>
diff --git a/sandbox/PerfBenchmarkDotNet/Program.cs b/sandbox/PerfBenchmarkDotNet/Program.cs
index f611fc6a..b51d63fe 100644
--- a/sandbox/PerfBenchmarkDotNet/Program.cs
+++ b/sandbox/PerfBenchmarkDotNet/Program.cs
@@ -53,6 +53,7 @@ namespace PerfBenchmarkDotNet
                 typeof(ImproveStringKeySerializeBenchmark),
                 typeof(MessagePackReaderBenchmark),
                 typeof(MessagePackWriterBenchmark),
+                typeof(SpanBenchmarks),
             });
 
             // args = new[] { "0" };
diff --git a/sandbox/PerfBenchmarkDotNet/SpanBenchmarks.cs b/sandbox/PerfBenchmarkDotNet/SpanBenchmarks.cs
new file mode 100644
index 00000000..4e104036
--- /dev/null
+++ b/sandbox/PerfBenchmarkDotNet/SpanBenchmarks.cs
@@ -0,0 +1,72 @@
+using System;
+using BenchmarkDotNet.Attributes;
+
+namespace PerfBenchmarkDotNet
+{
+    public class SpanBenchmarks
+    {
+        private const string SomeString = "Hi there";
+        private static readonly byte[] byteArray = new byte[1];
+
+        [Benchmark]
+        public unsafe void PinString()
+        {
+            fixed (char* pChars = SomeString)
+            {
+                char ch = pChars[0];
+            }
+        }
+
+        [Benchmark]
+        public unsafe void GetSpanFromString()
+        {
+            char ch = SomeString.AsSpan()[0];
+        }
+
+        [Benchmark]
+        public unsafe void PinArray()
+        {
+            fixed (byte* pBytes = byteArray)
+            {
+                pBytes[0] = 7;
+            }
+        }
+
+        [Benchmark]
+        public unsafe void PinArray_Indexer()
+        {
+            fixed (byte* pBytes = &byteArray[0])
+            {
+                pBytes[0] = 7;
+            }
+        }
+
+        [Benchmark]
+        public void PinSpan()
+        {
+            PinSpan_Helper(byteArray);
+        }
+
+        private static unsafe void PinSpan_Helper(Span<byte> bytes)
+        {
+            fixed (byte* pBytes = bytes)
+            {
+                pBytes[0] = 7;
+            }
+        }
+
+        [Benchmark]
+        public void PinSpan_Indexer()
+        {
+            PinSpan_Indexer_Helper(byteArray);
+        }
+
+        private static unsafe void PinSpan_Indexer_Helper(Span<byte> bytes)
+        {
+            fixed (byte* pBytes = &bytes[0])
+            {
+                pBytes[0] = 8;
+            }
+        }
+    }
+}