/* * Copyright (c) Contributors, http://opensimulator.org/ * See CONTRIBUTORS.TXT for a full list of copyright holders. * * 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 the OpenSimulator Project 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 DEVELOPERS ``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 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. */ using System; using System.Collections.Generic; using System.Linq; using System.Reflection; using System.Threading; using log4net; namespace OpenSim.Framework.Monitoring { /// <summary> /// Experimental watchdog for memory usage. /// </summary> public static class MemoryWatchdog { // private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType); /// <summary> /// Is this watchdog active? /// </summary> public static bool Enabled { get { return m_enabled; } set { // m_log.DebugFormat("[MEMORY WATCHDOG]: Setting MemoryWatchdog.Enabled to {0}", value); if (value && !m_enabled) UpdateLastRecord(GC.GetTotalMemory(false), Util.EnvironmentTickCount()); m_enabled = value; } } private static bool m_enabled; /// <summary> /// Last memory churn in bytes per millisecond. /// </summary> public static double AverageMemoryChurn { get { if (m_samples.Count > 0) return m_samples.Average(); else return 0; } } /// <summary> /// Average memory churn in bytes per millisecond. /// </summary> public static double LastMemoryChurn { get { if (m_samples.Count > 0) return m_samples.Last(); else return 0; } } /// <summary> /// Maximum number of statistical samples. /// </summary> /// <remarks> /// At the moment this corresponds to 1 minute since the sampling rate is every 2.5 seconds as triggered from /// the main Watchdog. /// </remarks> private static int m_maxSamples = 24; /// <summary> /// Time when the watchdog was last updated. /// </summary> private static int m_lastUpdateTick; /// <summary> /// Memory used at time of last watchdog update. /// </summary> private static long m_lastUpdateMemory; /// <summary> /// Memory churn rate per millisecond. /// </summary> // private static double m_churnRatePerMillisecond; /// <summary> /// Historical samples for calculating moving average. /// </summary> private static Queue<double> m_samples = new Queue<double>(m_maxSamples); public static void Update() { int now = Util.EnvironmentTickCount(); long memoryNow = GC.GetTotalMemory(false); long memoryDiff = memoryNow - m_lastUpdateMemory; if (memoryDiff >= 0) { if (m_samples.Count >= m_maxSamples) m_samples.Dequeue(); double elapsed = Util.EnvironmentTickCountSubtract(now, m_lastUpdateTick); // This should never happen since it's not useful for updates to occur with no time elapsed, but // protect ourselves from a divide-by-zero just in case. if (elapsed == 0) return; m_samples.Enqueue(memoryDiff / (double)elapsed); } UpdateLastRecord(memoryNow, now); } private static void UpdateLastRecord(long memoryNow, int timeNow) { m_lastUpdateMemory = memoryNow; m_lastUpdateTick = timeNow; } } }