Add MemoryWatchdog class missing from git master a1e9964
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/*
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* Copyright (c) Contributors, http://opensimulator.org/
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* See CONTRIBUTORS.TXT for a full list of copyright holders.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of the OpenSimulator Project nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Reflection;
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using System.Threading;
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using log4net;
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namespace OpenSim.Framework
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{
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/// <summary>
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/// Experimental watchdog for memory usage.
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/// </summary>
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public static class MemoryWatchdog
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{
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// private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
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/// <summary>
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/// Is this watchdog active?
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/// </summary>
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public static bool Enabled
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{
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get { return m_enabled; }
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set
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{
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// m_log.DebugFormat("[MEMORY WATCHDOG]: Setting MemoryWatchdog.Enabled to {0}", value);
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if (value && !m_enabled)
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UpdateLastRecord(GC.GetTotalMemory(false), Util.EnvironmentTickCount());
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m_enabled = value;
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}
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}
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private static bool m_enabled;
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/// <summary>
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/// Average memory churn in bytes per millisecond.
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/// </summary>
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public static double AverageMemoryChurn
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{
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get { if (m_samples.Count > 0) return m_samples.Average(); else return 0; }
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}
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/// <summary>
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/// Maximum number of statistical samples.
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/// </summary>
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/// <remarks>
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/// At the moment this corresponds to 1 minute since the sampling rate is every 2.5 seconds as triggered from
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/// the main Watchdog.
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/// </remarks>
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private static int m_maxSamples = 24;
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/// <summary>
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/// Time when the watchdog was last updated.
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/// </summary>
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private static int m_lastUpdateTick;
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/// <summary>
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/// Memory used at time of last watchdog update.
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/// </summary>
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private static long m_lastUpdateMemory;
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/// <summary>
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/// Memory churn rate per millisecond.
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/// </summary>
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private static double m_churnRatePerMillisecond;
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/// <summary>
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/// Historical samples for calculating moving average.
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/// </summary>
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private static Queue<double> m_samples = new Queue<double>(m_maxSamples);
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public static void Update()
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{
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int now = Util.EnvironmentTickCount();
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long memoryNow = GC.GetTotalMemory(false);
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long memoryDiff = memoryNow - m_lastUpdateMemory;
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if (memoryDiff >= 0)
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{
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if (m_samples.Count >= m_maxSamples)
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m_samples.Dequeue();
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double elapsed = Util.EnvironmentTickCountSubtract(now, m_lastUpdateTick);
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// This should never happen since it's not useful for updates to occur with no time elapsed, but
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// protect ourselves from a divide-by-zero just in case.
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if (elapsed == 0)
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return;
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m_samples.Enqueue(memoryDiff / (double)elapsed);
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}
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UpdateLastRecord(memoryNow, now);
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}
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private static void UpdateLastRecord(long memoryNow, int timeNow)
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{
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m_lastUpdateMemory = memoryNow;
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m_lastUpdateTick = timeNow;
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}
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}
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}
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