opensim-development – Blame information for rev 1
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1 | eva | 1 | /* |
2 | * Copyright (c) Contributors, http://opensimulator.org/ |
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3 | * See CONTRIBUTORS.TXT for a full list of copyright holders. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions are met: |
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7 | * * Redistributions of source code must retain the above copyright |
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8 | * notice, this list of conditions and the following disclaimer. |
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9 | * * Redistributions in binary form must reproduce the above copyright |
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10 | * notice, this list of conditions and the following disclaimer in the |
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11 | * documentation and/or other materials provided with the distribution. |
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12 | * * Neither the name of the OpenSimulator Project nor the |
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13 | * names of its contributors may be used to endorse or promote products |
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14 | * derived from this software without specific prior written permission. |
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15 | * |
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16 | * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY |
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17 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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18 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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19 | * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY |
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20 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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21 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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22 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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23 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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24 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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25 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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26 | */ |
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27 | |||
28 | using System; |
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29 | using System.Collections.Generic; |
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30 | using System.Linq; |
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31 | using System.Reflection; |
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32 | using System.Threading; |
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33 | using log4net; |
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34 | |||
35 | namespace OpenSim.Framework.Monitoring |
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36 | { |
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37 | /// <summary> |
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38 | /// Experimental watchdog for memory usage. |
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39 | /// </summary> |
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40 | public static class MemoryWatchdog |
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41 | { |
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42 | // private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType); |
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43 | |||
44 | /// <summary> |
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45 | /// Is this watchdog active? |
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46 | /// </summary> |
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47 | public static bool Enabled |
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48 | { |
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49 | get { return m_enabled; } |
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50 | set |
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51 | { |
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52 | // m_log.DebugFormat("[MEMORY WATCHDOG]: Setting MemoryWatchdog.Enabled to {0}", value); |
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53 | |||
54 | if (value && !m_enabled) |
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55 | UpdateLastRecord(GC.GetTotalMemory(false), Util.EnvironmentTickCount()); |
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56 | |||
57 | m_enabled = value; |
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58 | } |
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59 | } |
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60 | private static bool m_enabled; |
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61 | |||
62 | /// <summary> |
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63 | /// Average heap allocation rate in bytes per millisecond. |
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64 | /// </summary> |
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65 | public static double AverageHeapAllocationRate |
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66 | { |
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67 | get { if (m_samples.Count > 0) return m_samples.Average(); else return 0; } |
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68 | } |
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69 | |||
70 | /// <summary> |
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71 | /// Last heap allocation in bytes |
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72 | /// </summary> |
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73 | public static double LastHeapAllocationRate |
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74 | { |
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75 | get { if (m_samples.Count > 0) return m_samples.Last(); else return 0; } |
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76 | } |
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77 | |||
78 | /// <summary> |
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79 | /// Maximum number of statistical samples. |
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80 | /// </summary> |
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81 | /// <remarks> |
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82 | /// At the moment this corresponds to 1 minute since the sampling rate is every 2.5 seconds as triggered from |
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83 | /// the main Watchdog. |
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84 | /// </remarks> |
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85 | private static int m_maxSamples = 24; |
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86 | |||
87 | /// <summary> |
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88 | /// Time when the watchdog was last updated. |
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89 | /// </summary> |
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90 | private static int m_lastUpdateTick; |
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91 | |||
92 | /// <summary> |
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93 | /// Memory used at time of last watchdog update. |
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94 | /// </summary> |
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95 | private static long m_lastUpdateMemory; |
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96 | |||
97 | /// <summary> |
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98 | /// Memory churn rate per millisecond. |
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99 | /// </summary> |
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100 | // private static double m_churnRatePerMillisecond; |
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101 | |||
102 | /// <summary> |
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103 | /// Historical samples for calculating moving average. |
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104 | /// </summary> |
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105 | private static Queue<double> m_samples = new Queue<double>(m_maxSamples); |
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106 | |||
107 | public static void Update() |
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108 | { |
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109 | int now = Util.EnvironmentTickCount(); |
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110 | long memoryNow = GC.GetTotalMemory(false); |
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111 | long memoryDiff = memoryNow - m_lastUpdateMemory; |
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112 | |||
113 | if (memoryDiff >= 0) |
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114 | { |
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115 | if (m_samples.Count >= m_maxSamples) |
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116 | m_samples.Dequeue(); |
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117 | |||
118 | double elapsed = Util.EnvironmentTickCountSubtract(now, m_lastUpdateTick); |
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119 | |||
120 | // This should never happen since it's not useful for updates to occur with no time elapsed, but |
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121 | // protect ourselves from a divide-by-zero just in case. |
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122 | if (elapsed == 0) |
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123 | return; |
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124 | |||
125 | m_samples.Enqueue(memoryDiff / (double)elapsed); |
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126 | } |
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127 | |||
128 | UpdateLastRecord(memoryNow, now); |
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129 | } |
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130 | |||
131 | private static void UpdateLastRecord(long memoryNow, int timeNow) |
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132 | { |
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133 | m_lastUpdateMemory = memoryNow; |
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134 | m_lastUpdateTick = timeNow; |
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135 | } |
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136 | } |
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137 | } |