XEngine: make calls to gc.collect on region startup scripts loading a configurable option, since it is very slow operation

OpenSim/Region/ScriptEngine/XEngine/XEngine.cs

@@ -110,6 +110,7 @@ namespace OpenSim.Region.ScriptEngine.XEngine
         private int m_ScriptFailCount; // Number of script fails since compile queue was last empty
         private string m_ScriptErrorMessage;
         private bool m_AppDomainLoading;
+        private bool m_CompactMemOnLoad;
         private Dictionary<UUID,ArrayList> m_ScriptErrors =
                 new Dictionary<UUID,ArrayList>();
 
@@ -301,8 +302,8 @@ namespace OpenSim.Region.ScriptEngine.XEngine
             m_MaxScriptQueue = m_ScriptConfig.GetInt("MaxScriptEventQueue",300);
             m_StackSize = m_ScriptConfig.GetInt("ThreadStackSize", 262144);
             m_SleepTime = m_ScriptConfig.GetInt("MaintenanceInterval", 10) * 1000;
-            m_AppDomainLoading = m_ScriptConfig.GetBoolean("AppDomainLoading", true);
+            m_AppDomainLoading = m_ScriptConfig.GetBoolean("AppDomainLoading", false);
-
+            m_CompactMemOnLoad = m_ScriptConfig.GetBoolean("CompactMemOnLoad", false);
             m_EventLimit = m_ScriptConfig.GetInt("EventLimit", 30);
             m_KillTimedOutScripts = m_ScriptConfig.GetBoolean("KillTimedOutScripts", false);
             m_SaveTime = m_ScriptConfig.GetInt("SaveInterval", 120) * 1000;
@@ -1278,10 +1279,9 @@ namespace OpenSim.Region.ScriptEngine.XEngine
                 }
             }
 
-            // do not load a assembly on top of a lot of to release memory
+            // optionaly do not load a assembly on top of a lot of to release memory
-            // also yield a bit
             // only if logins disable since causes a lot of rubber banding            
-            if(!m_Scene.LoginsEnabled)
+            if(m_CompactMemOnLoad && !m_Scene.LoginsEnabled)
                 GC.Collect(2);
 
             ScriptInstance instance = null;

bin/OpenSim.ini.example

@@ -925,6 +925,13 @@
     ;; by scripts have changed.
     ; DeleteScriptsOnStartup = true
 
+    ;# {CompactMemOnLoad} {} {compacts memory on each script load at startup?} {true false} false
+    ;; forces calls to memory garbage collector before loading each script DLL during region startup.
+    ;; Peek memory usage is reduced and region starts with a more compacted memory allocation.
+    ;; But this costs a lot of time, so region load will take a lot longer.
+    ;; it is more usefull if there are no previously compiled scripts DLLs (as with DeleteScriptsOnStartup = true)
+    ;CompactMemOnLoad = false
+    
     ;# {DefaultCompileLanguage} {Enabled:true} {Default script language?} {lsl vb cs} lsl
     ;; Default language for scripts
     ; DefaultCompileLanguage = "lsl"

bin/OpenSimDefaults.ini

@@ -1696,13 +1696,22 @@
     ; this may only be a problem if regions stay alive for a long time with lots of scripts added or edited.
     ; at this time some mono versions seem to have problems with the true option
     ; so default is now false until a fix is found
-    AppDomainLoading = false
+    ; AppDomainLoading = false
 
-    ; Controls whether previously compiled scripts DLLs are deleted on sim restart. If you set this to false
+    ; Controls whether previously compiled scripts DLLs are deleted on sim restart.
-    ; then startup will be considerably faster since scripts won't need to be recompiled. However, then it becomes your responsibility to delete the 
+    ; If you set this to false then startup will be considerably faster since scripts won't need to be recompiled.
-    ; compiled scripts if you're recompiling OpenSim from source code and internal interfaces used
+    ; It should be true on first run after updating opensim binary version
-    ; by scripts have changed.
+    ; after first run you can change to false.
-    ; DeleteScriptsOnStartup = false
+    ; You can also set it to false and delete the script DLLs by hand
+    ; This does not delete cached scripts state.
+    ; DeleteScriptsOnStartup = true
+
+    ; CompactMemOnLoad forces calls to memory garbage collector before loading each script binary
+    ; forces calls to memory garbage collector before loading each script DLL during region startup.
+    ; Peek memory usage is reduced and region starts with a more compacted memory allocation.
+    ; But this costs a lot of time, so region load will take a lot longer.
+    ; it is more usefull if there are no previously compiled scripts DLLs (or DeleteScriptsOnStartup = true)
+    ; CompactMemOnLoad = false
     
     ; Controls whether scripts are stopped by aborting their threads externally (abort) 
     ; or by co-operative checks inserted by OpenSimulator into compiled script (co-op).