Use only one (static) (de-)serializer for (de-)serializing SOPs.

That improves performance drastically, at least for Mono, as the
(de-)serializers can then be optimized (and won't use reflection anymore).
On my system, before this change de-/serialization took ~9s/9s, whereas
after the change it takes ~.5/.2s.

OpenSim/Region/Environment/Scenes/SceneObjectGroup.cs

@@ -401,9 +401,9 @@ namespace OpenSim.Region.Environment.Scenes
         {
             SetRootPart(part);
         }
-        
+
         public SceneObjectGroup(string xmlData, bool isOriginalXmlFormat)
-            : this(UUID.Zero, xmlData, isOriginalXmlFormat)            
+            : this(UUID.Zero, xmlData, isOriginalXmlFormat)
         {
         }
 
@@ -423,7 +423,10 @@ namespace OpenSim.Region.Environment.Scenes
         {
             if (!isOriginalXmlFormat)
                 throw new Exception("This constructor must specify the xml is in OpenSim's original format");
-            
+
+            m_log.DebugFormat("[SOG]: Starting deserialization of SOG");
+            int time = System.Environment.TickCount;
+
             // libomv.types changes UUID to Guid
             xmlData = xmlData.Replace("<UUID>", "<Guid>");
             xmlData = xmlData.Replace("</UUID>", "</Guid>");
@@ -475,6 +478,7 @@ namespace OpenSim.Region.Environment.Scenes
 
             reader.Close();
             sr.Close();
+            m_log.DebugFormat("[SOG]: Finished deserialization of SOG {0}, {1}ms", Name, System.Environment.TickCount - time);
         }
 
         /// <summary>
@@ -487,6 +491,9 @@ namespace OpenSim.Region.Environment.Scenes
 
         protected void SetFromXml(string xmlData)
         {
+            m_log.DebugFormat("[SOG]: Starting deserialization of SOG");
+            int time = System.Environment.TickCount;
+
             // libomv.types changes UUID to Guid
             xmlData = xmlData.Replace("<UUID>", "<Guid>");
             xmlData = xmlData.Replace("</UUID>", "</Guid>");
@@ -531,6 +538,8 @@ namespace OpenSim.Region.Environment.Scenes
 
             reader.Close();
             sr.Close();
+
+            m_log.DebugFormat("[SOG]: Finished deserialization of SOG {0}, {1}ms", Name, System.Environment.TickCount - time);
         }
 
         protected virtual SceneObjectPart CreatePartFromXml(XmlTextReader reader)
@@ -714,6 +723,9 @@ namespace OpenSim.Region.Environment.Scenes
 
         public void ToXml(XmlTextWriter writer)
         {
+            m_log.DebugFormat("[SOG]: Starting serialization of {0}", Name);
+            int time = System.Environment.TickCount;
+
             writer.WriteStartElement(String.Empty, "SceneObjectGroup", String.Empty);
             writer.WriteStartElement(String.Empty, "RootPart", String.Empty);
             m_rootPart.ToXml(writer);
@@ -735,6 +747,9 @@ namespace OpenSim.Region.Environment.Scenes
 
             writer.WriteEndElement();
             writer.WriteEndElement();
+
+            m_log.DebugFormat("[SOG]: Finished serialization of SOG {0}, {1}ms", Name, System.Environment.TickCount - time);
+
         }
 
         public string ToXmlString2()
@@ -752,6 +767,9 @@ namespace OpenSim.Region.Environment.Scenes
 
         public void ToXml2(XmlTextWriter writer)
         {
+            m_log.DebugFormat("[SOG]: Starting serialization of SOG {0} to XML2", Name);
+            int time = System.Environment.TickCount;
+
             writer.WriteStartElement(String.Empty, "SceneObjectGroup", String.Empty);
             m_rootPart.ToXml(writer);
             writer.WriteStartElement(String.Empty, "OtherParts", String.Empty);
@@ -769,6 +787,7 @@ namespace OpenSim.Region.Environment.Scenes
 
             writer.WriteEndElement();
             writer.WriteEndElement();
+            m_log.DebugFormat("[SOG]: Finished serialization of SOG {0} to XML2, {1}ms", Name, System.Environment.TickCount - time);
         }
 
         /// <summary>

OpenSim/Region/Environment/Scenes/SceneObjectPart.cs

@@ -96,7 +96,11 @@ namespace OpenSim.Region.Environment.Scenes
     public class SceneObjectPart : IScriptHost, ISerializable
     {
         private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
-        
+
+        // use only one serializer to give the runtime a chance to optimize it (it won't do that if you
+        // use a new instance every time)
+        private static XmlSerializer serializer = new XmlSerializer(typeof (SceneObjectPart));
+
         #region Fields
 
         [XmlIgnore]
@@ -1619,7 +1623,6 @@ if (m_shape != null) {
         /// <returns></returns>
         public static SceneObjectPart FromXml(UUID fromUserInventoryItemId, XmlReader xmlReader)
         {
-            XmlSerializer serializer = new XmlSerializer(typeof (SceneObjectPart));
             SceneObjectPart part = (SceneObjectPart)serializer.Deserialize(xmlReader);
             part.m_fromUserInventoryItemID = fromUserInventoryItemId;
 
@@ -3186,7 +3189,6 @@ if (m_shape != null) {
         /// <param name="xmlWriter"></param>
         public void ToXml(XmlWriter xmlWriter)
         {
-            XmlSerializer serializer = new XmlSerializer(typeof (SceneObjectPart));
             serializer.Serialize(xmlWriter, this);
         }