1 files changed, 69 insertions, 0 deletions
diff --git a/src/DotNetOpenAuth.Test/Performance/HighPerformance.cs b/src/DotNetOpenAuth.Test/Performance/HighPerformance.cs
new file mode 100644
index 0000000..32b4cfa
--- /dev/null
+++ b/src/DotNetOpenAuth.Test/Performance/HighPerformance.cs
@@ -0,0 +1,69 @@
+//-----------------------------------------------------------------------
+// <copyright file="HighPerformance.cs" company="Andrew Arnott">
+//     Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOpenAuth.Test.Performance {
+	using System;
+	using System.Diagnostics;
+	using System.Threading;
+	using log4net;
+	using NUnit.Framework;
+
+	/// <summary>
+	/// Suppresses logging and forces the CPU into a high performance mode.
+	/// </summary>
+	internal class HighPerformance : IDisposable {
+		private readonly log4net.Core.Level originalLoggerThreshold;
+		private readonly PowerManagment.PowerSetting powerSetting;
+		private readonly ProcessPriorityClass originalProcessPriority;
+
+#pragma warning disable 0618
+		/// <summary>
+		/// Initializes a new instance of the <see cref="HighPerformance"/> class.
+		/// </summary>
+		internal HighPerformance() {
+			if (!PerformanceTestUtilities.CoolOff()) {
+				Assert.Inconclusive("Timed out waiting for a quiet CPU in which to perform perf tests.");
+			}
+
+			this.originalLoggerThreshold = LogManager.GetLoggerRepository().Threshold;
+			LogManager.GetLoggerRepository().Threshold = LogManager.GetLoggerRepository().LevelMap["OFF"];
+			this.powerSetting = new PowerManagment.PowerSetting(PowerManagment.PowerProfiles.HighPerformance);
+			this.originalProcessPriority = Process.GetCurrentProcess().PriorityClass;
+			Process.GetCurrentProcess().PriorityClass = ProcessPriorityClass.High;
+			Thread.CurrentThread.Priority = ThreadPriority.Highest;
+			HighCpu();
+		}
+
+		/// <summary>
+		/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
+		/// </summary>
+		public void Dispose() {
+			Thread.CurrentThread.Priority = ThreadPriority.Normal;
+			Process.GetCurrentProcess().PriorityClass = this.originalProcessPriority;
+			this.powerSetting.Dispose(); // restores original power setting.
+			LogManager.GetLoggerRepository().Threshold = this.originalLoggerThreshold;
+		}
+#pragma warning restore 0618
+
+		/// <summary>
+		/// Runs the CPU in a tight loop to get it out of any low power state.
+		/// </summary>
+		private static void HighCpu() {
+			int dummy;
+			new MultiSampleCodeTimer(10, 1000).Measure(
+				"Loop 1K times",
+				1,
+				delegate {
+					int k = 0;
+					while (k < 1000) {
+						k++;        // still in danger of being optimized.  
+					}
+
+					dummy = k;      // avoid optimization.  
+				});
+		}
+	}
+}