If "debug scene updates true" then print out to log when a garbage collection occurs.

OpenSim/Framework/GcNotify.cs

@@ -0,0 +1,62 @@
+/*
+ * 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.Reflection;
+using log4net;
+
+public class GcNotify
+{
+    private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
+
+    public static bool Enabled
+    {
+        get { return s_initialized; }
+        set
+        {
+            if (!s_initialized && value)
+                new GcNotify();
+
+            s_initialized = value;
+        }
+    }
+
+    private static bool s_initialized = false;
+
+    private GcNotify() {}
+
+    ~GcNotify()
+    {
+        if (!Environment.HasShutdownStarted && !AppDomain.CurrentDomain.IsFinalizingForUnload())
+        {
+            m_log.DebugFormat("[GC NOTIFY]: Garbage collection triggered.");
+
+            if (Enabled)
+                new GcNotify();
+        }
+    }
+}

OpenSim/Region/Framework/Scenes/Scene.cs

@@ -1085,7 +1085,10 @@ namespace OpenSim.Region.Framework.Scenes
             {
                 bool enableUpdateDebugging;
                 if (bool.TryParse(options["updates"], out enableUpdateDebugging))
+                {
                     DebugUpdates = enableUpdateDebugging;
+                    GcNotify.Enabled = DebugUpdates;
+                }
             }
         }