From a85ff884d97c3ea56200a5070f66bc523b7c4ca3 Mon Sep 17 00:00:00 2001
From: Dan Lake
Date: Sun, 30 Oct 2011 23:39:39 -0700
Subject: Experimental reorder of Heartbeat loop now simulates physics and
 sends updates to clients prior to sleep. Existing behavior was to sleep
 BEFORE sending updates. We found this patch reduced latency to clients by 1-2
 heartbeat periods.

---
 OpenSim/Region/Framework/Scenes/Scene.cs | 56 +++++++++++++++-----------------
 1 file changed, 27 insertions(+), 29 deletions(-)

(limited to 'OpenSim')

diff --git a/OpenSim/Region/Framework/Scenes/Scene.cs b/OpenSim/Region/Framework/Scenes/Scene.cs
index ff05e95..fa8bf85 100644
--- a/OpenSim/Region/Framework/Scenes/Scene.cs
+++ b/OpenSim/Region/Framework/Scenes/Scene.cs
@@ -1230,8 +1230,32 @@ namespace OpenSim.Region.Framework.Scenes
 //            m_log.DebugFormat("[SCENE]: Processing frame {0}", Frame);
 
             try
-            {
-                int tmpAgentMS = Util.EnvironmentTickCount();
+            {
+                int tmpPhysicsMS2 = Util.EnvironmentTickCount();
+                if ((Frame % m_update_physics == 0) && m_physics_enabled)
+                    m_sceneGraph.UpdatePreparePhysics();
+                physicsMS2 = Util.EnvironmentTickCountSubtract(tmpPhysicsMS2);
+
+                // Apply any pending avatar force input to the avatar's velocity
+                int tmpAgentMS = Util.EnvironmentTickCount();
+                if (Frame % m_update_entitymovement == 0)
+                    m_sceneGraph.UpdateScenePresenceMovement();
+                agentMS = Util.EnvironmentTickCountSubtract(tmpAgentMS);
+
+                // Perform the main physics update.  This will do the actual work of moving objects and avatars according to their
+                // velocity
+                int tmpPhysicsMS = Util.EnvironmentTickCount();
+                if (Frame % m_update_physics == 0)
+                {
+                    if (m_physics_enabled)
+                        physicsFPS = m_sceneGraph.UpdatePhysics(MinFrameTime);
+
+                    if (SynchronizeScene != null)
+                        SynchronizeScene(this);
+                }
+                physicsMS = Util.EnvironmentTickCountSubtract(tmpPhysicsMS);
+
+                tmpAgentMS = Util.EnvironmentTickCount();
 
                 // Check if any objects have reached their targets
                 CheckAtTargets();
@@ -1259,33 +1283,7 @@ namespace OpenSim.Region.Framework.Scenes
                     });
                 }
 
-                agentMS = Util.EnvironmentTickCountSubtract(tmpAgentMS);
-
-                int tmpPhysicsMS2 = Util.EnvironmentTickCount();
-                if ((Frame % m_update_physics == 0) && m_physics_enabled)
-                    m_sceneGraph.UpdatePreparePhysics();
-                physicsMS2 = Util.EnvironmentTickCountSubtract(tmpPhysicsMS2);
-
-                // Apply any pending avatar force input to the avatar's velocity
-                if (Frame % m_update_entitymovement == 0)
-                {
-                    tmpAgentMS = Util.EnvironmentTickCount();
-                    m_sceneGraph.UpdateScenePresenceMovement();
-                    agentMS += Util.EnvironmentTickCountSubtract(tmpAgentMS);
-                }
-
-                // Perform the main physics update.  This will do the actual work of moving objects and avatars according to their
-                // velocity
-                int tmpPhysicsMS = Util.EnvironmentTickCount();
-                if (Frame % m_update_physics == 0)
-                {
-                    if (m_physics_enabled)
-                        physicsFPS = m_sceneGraph.UpdatePhysics(MinFrameTime);
-
-                    if (SynchronizeScene != null)
-                        SynchronizeScene(this);
-                }
-                physicsMS = Util.EnvironmentTickCountSubtract(tmpPhysicsMS);
+                agentMS += Util.EnvironmentTickCountSubtract(tmpAgentMS);
 
                 // Delete temp-on-rez stuff
                 if (Frame % m_update_temp_cleaning == 0 && !m_cleaningTemps)
-- 
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