rename MinFrameTime as FrameTime, since it is not a minimum but a target value; retune its value a bit so reported FPS is closer to integer value; change ode step size acording to reduce jitter in phys FPS; Make Statistics Scaling factor (fludge factor) configurable. (legacy default of 5.0 in code)

OpenSim/Region/Framework/Scenes/Scene.cs

@@ -357,14 +357,13 @@ namespace OpenSim.Region.Framework.Scenes
         public uint MaintenanceRun { get; private set; }
 
         /// <summary>
-        /// The minimum length of time in seconds that will be taken for a scene frame.  If the frame takes less time then we
+        /// Frame time
-        /// will sleep for the remaining period.
-        /// </summary>
-        /// <remarks>
-        /// One can tweak this number to experiment.  One current effect of reducing it is to make avatar animations
-        /// occur too quickly (viewer 1) or with even more slide (viewer 2).
         /// </remarks>
-		public float MinFrameTime { get; private set; }
+		public float FrameTime { get; private set; }
+
+        // statistics frame scale factor for viewer and scripts.
+        // see SimStatsReporter.cs
+        public float StatisticsFPSfactor { get; private set; }
 
         /// <summary>
         /// The minimum length of time in seconds that will be taken for a scene frame.
@@ -860,7 +859,8 @@ namespace OpenSim.Region.Framework.Scenes
             : this(regInfo)
         {
             m_config = config;
-            MinFrameTime = 0.089f;
+            FrameTime = 0.0908f;
+            StatisticsFPSfactor = 5.0f;
             MinMaintenanceTime = 1;
             SeeIntoRegion = true;
 
@@ -1100,7 +1100,8 @@ namespace OpenSim.Region.Framework.Scenes
                     }
                 }
 
-				MinFrameTime              = startupConfig.GetFloat( "MinFrameTime",                      MinFrameTime);
+                FrameTime                 = startupConfig.GetFloat( "FrameTime", FrameTime);
+                StatisticsFPSfactor       = startupConfig.GetFloat( "StatisticsFPSfactor", StatisticsFPSfactor);
 
                 m_update_backup           = startupConfig.GetInt("UpdateStorageEveryNFrames",         m_update_backup);
                 m_update_coarse_locations = startupConfig.GetInt("UpdateCoarseLocationsEveryNFrames", m_update_coarse_locations);
@@ -1729,7 +1730,7 @@ namespace OpenSim.Region.Framework.Scenes
                     if (Frame % m_update_physics == 0)
                     {
                         if (PhysicsEnabled)
-                            physicsFPS = m_sceneGraph.UpdatePhysics(MinFrameTime);
+                            physicsFPS = m_sceneGraph.UpdatePhysics(FrameTime);
 
                         if (SynchronizeScene != null)
                             SynchronizeScene(this);
@@ -1861,7 +1862,7 @@ namespace OpenSim.Region.Framework.Scenes
 
                 // estimate sleep time
                 tmpMS2 = tmpMS - framestart;
-                tmpMS2 = (double)MinFrameTime * 1000.0D - tmpMS2;
+                tmpMS2 = (double)FrameTime * 1000.0D - tmpMS2;
 
                 m_firstHeartbeat = false;
 
@@ -1882,12 +1883,12 @@ namespace OpenSim.Region.Framework.Scenes
           // Optionally warn if a frame takes double the amount of time that it should.
                 if (DebugUpdates
                     && Util.EnvironmentTickCountSubtract(
-                        m_lastFrameTick, previousFrameTick) > (int)(MinFrameTime * 1000 * 2))
+                        m_lastFrameTick, previousFrameTick) > (int)(FrameTime * 1000 * 2))
 
                     m_log.WarnFormat(
                         "[SCENE]: Frame took {0} ms (desired max {1} ms) in {2}",
                         Util.EnvironmentTickCountSubtract(m_lastFrameTick, previousFrameTick),
-                        MinFrameTime * 1000,
+                        FrameTime * 1000,
 
                         RegionInfo.RegionName);
             }

OpenSim/Region/Framework/Scenes/SimStatsReporter.cs

@@ -185,11 +185,16 @@ namespace OpenSim.Region.Framework.Scenes
         /// Parameter to adjust reported scene fps
         /// </summary>
         /// <remarks>
-        /// Our scene loop runs slower than other server implementations, apparantly because we work somewhat differently.
+        /// The close we have to a frame rate as expected by viewers, users and scripts
-        /// However, we will still report an FPS that's closer to what people are used to seeing.  A lower FPS might
+        /// is heartbeat rate.
-        /// affect clients and monitoring scripts/software.
+        /// heartbeat rate default value is very diferent from the expected one
+        /// and can be changed from region to region acording to its specific simulation needs
+        /// since this creates incompatibility with expected values,
+        /// this scale factor can be used to normalize values to a Virtual FPS.
+        /// original decision was to use a value of 55fps for all opensim
+        /// corresponding, with default heartbeat rate, to a value of 5.
         /// </remarks>
-        private float m_reportedFpsCorrectionFactor = 1.0f;
+        private float m_statisticsFPSfactor = 5.0f;
 
         // saved last reported value so there is something available for llGetRegionFPS 
         private float lastReportedSimFPS;
@@ -252,6 +257,7 @@ namespace OpenSim.Region.Framework.Scenes
             m_scene = scene;
 
             ReportingRegion = scene.RegionInfo;
+            m_statisticsFPSfactor = scene.StatisticsFPSfactor;
 
             m_objectCapacity = scene.RegionInfo.ObjectCapacity;
             m_report.AutoReset = true;
@@ -266,7 +272,7 @@ namespace OpenSim.Region.Framework.Scenes
 
             /// At the moment, we'll only report if a frame is over 120% of target, since commonly frames are a bit
             /// longer than ideal (which in itself is a concern).
-            SlowFramesStatReportThreshold = (int)Math.Ceiling(m_scene.MinFrameTime * 1000 * 1.2);
+            SlowFramesStatReportThreshold = (int)Math.Ceiling(m_scene.FrameTime * 1000 * 1.2);
 
             SlowFramesStat
                 = new Stat(
@@ -351,10 +357,10 @@ namespace OpenSim.Region.Framework.Scenes
                 float updateFactor = 1.0f / m_statsUpdateFactor;
 
                 // the nominal frame time, corrected by reporting multiplier
-                float TargetFrameTime = 1000.0f * m_scene.MinFrameTime / m_reportedFpsCorrectionFactor;
+                float TargetFrameTime = 1000.0f * m_scene.FrameTime /  m_statisticsFPSfactor;
 
                 // acumulated fps scaled by reporting multiplier
-                float reportedFPS = (m_fps * m_reportedFpsCorrectionFactor);
+                float reportedFPS = (m_fps *  m_statisticsFPSfactor);
                 if (reportedFPS <= 0)
                    reportedFPS = 1;
 
@@ -376,7 +382,7 @@ namespace OpenSim.Region.Framework.Scenes
                 m_activePrim = m_scene.SceneGraph.GetActiveObjectsCount();
                 m_activeScripts = m_scene.SceneGraph.GetActiveScriptsCount();
 
-                float physfps = m_pfps * updateFactor;
+                float physfps = m_pfps * updateFactor * m_statisticsFPSfactor;
                 if (physfps < 0)
                     physfps = 0;
                 else if(physfps > reportedFPS)

OpenSim/Region/PhysicsModules/ubOde/ODEScene.cs

@@ -495,7 +495,7 @@ namespace OpenSim.Region.PhysicsModule.ubOde
                 }
             }
 
-            float heartbeat = 1/m_frameWorkScene.MinFrameTime;
+            float heartbeat = 1/m_frameWorkScene.FrameTime;
             maximumAngularVelocity = 0.49f * heartbeat *(float)Math.PI;
             maxAngVelocitySQ = maximumAngularVelocity * maximumAngularVelocity;