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/*
* 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
{
/// <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>
/// Average 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>
/// 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;
}
}
}
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