framework main thread pool is always active and in use ( even id hard to catch) so show in on show stats. Disable ServerStatsCollector by default, since most don't use it, Adicionally it uses shared framework performance counters system that may be affected if a region crashs

OpenSim/Framework/Monitoring/ServerStatsCollector.cs

@@ -88,7 +88,7 @@ namespace OpenSim.Framework.Monitoring
             IConfig cfg = source.Configs["Monitoring"];
 
             if (cfg != null)
-                Enabled = cfg.GetBoolean("ServerStatsEnabled", true);
+                Enabled = cfg.GetBoolean("ServerStatsEnabled", false);
 
             if (Enabled)
             {
@@ -98,12 +98,18 @@ namespace OpenSim.Framework.Monitoring
 
         public void Start()
         {
+            if(!Enabled)
+                return;
+
             if (RegisteredStats.Count == 0)
                 RegisterServerStats();
         }
 
         public void Close()
         {
+            if(!Enabled)
+                return;
+
             if (RegisteredStats.Count > 0)
             {
                 foreach (Stat stat in RegisteredStats.Values)

OpenSim/Framework/Servers/ServerBase.cs

@@ -882,16 +882,12 @@ namespace OpenSim.Framework.Servers
                 sb.Append("\n");
             }
 
-            sb.Append("\n");
+            sb.Append(GetThreadPoolReport());
 
-            // For some reason mono 2.6.7 returns an empty threads set!  Not going to confuse people by reporting
-            // zero active threads.
+            sb.Append("\n");
             int totalThreads = Process.GetCurrentProcess().Threads.Count;
             if (totalThreads > 0)
-                sb.AppendFormat("Total threads active: {0}\n\n", totalThreads);
-
-            sb.Append("Main threadpool (excluding script engine pools)\n");
-            sb.Append(GetThreadPoolReport());
+                sb.AppendFormat("Total process threads active: {0}\n\n", totalThreads);
 
             return sb.ToString();
         }
@@ -902,15 +898,46 @@ namespace OpenSim.Framework.Servers
         /// <returns></returns>
         public static string GetThreadPoolReport()
         {
+
+            StringBuilder sb = new StringBuilder();
+
+            // framework pool is alwasy active
+            int maxWorkers;
+            int minWorkers;
+            int curWorkers;
+            int maxComp;
+            int minComp;
+            int curComp;
+
+            try
+            {
+                ThreadPool.GetMaxThreads(out maxWorkers, out maxComp);
+                ThreadPool.GetMinThreads(out minWorkers, out minComp);
+                ThreadPool.GetAvailableThreads(out curWorkers, out curComp);
+                curWorkers = maxWorkers - curWorkers;
+                curComp = maxComp - curComp;
+
+                sb.Append("\nFramework main threadpool \n");
+                sb.AppendFormat("workers:    {0} ({1} / {2})\n", curWorkers, maxWorkers, minWorkers);
+                sb.AppendFormat("Completion: {0} ({1} / {2})\n", curComp, maxComp, minComp);
+            }
+            catch { }
+
+            if (
+                Util.FireAndForgetMethod == FireAndForgetMethod.QueueUserWorkItem
+                    || Util.FireAndForgetMethod == FireAndForgetMethod.UnsafeQueueUserWorkItem)
+            {
+                sb.AppendFormat("\nThread pool used: Framework main threadpool\n");
+                return sb.ToString();
+            }
+
             string threadPoolUsed = null;
             int maxThreads = 0;
             int minThreads = 0;
             int allocatedThreads = 0;
             int inUseThreads = 0;
             int waitingCallbacks = 0;
-            int completionPortThreads = 0;
 
-            StringBuilder sb = new StringBuilder();
             if (Util.FireAndForgetMethod == FireAndForgetMethod.SmartThreadPool)
             {
                 STPInfo stpi = Util.GetSmartThreadPoolInfo();
@@ -926,22 +953,10 @@ namespace OpenSim.Framework.Servers
                     waitingCallbacks = stpi.WaitingCallbacks;
                 }
             }
-            else if (
-                Util.FireAndForgetMethod == FireAndForgetMethod.QueueUserWorkItem
-                    || Util.FireAndForgetMethod == FireAndForgetMethod.UnsafeQueueUserWorkItem)
-            {
-                threadPoolUsed = "BuiltInThreadPool";
-                ThreadPool.GetMaxThreads(out maxThreads, out completionPortThreads);
-                ThreadPool.GetMinThreads(out minThreads, out completionPortThreads);
-                int availableThreads;
-                ThreadPool.GetAvailableThreads(out availableThreads, out completionPortThreads);
-                inUseThreads = maxThreads - availableThreads;
-                allocatedThreads = -1;
-                waitingCallbacks = -1;
-            }
-
+ 
             if (threadPoolUsed != null)
             {
+                sb.Append("\nThreadpool (excluding script engine pools)\n");
                 sb.AppendFormat("Thread pool used           : {0}\n", threadPoolUsed);
                 sb.AppendFormat("Max threads                : {0}\n", maxThreads);
                 sb.AppendFormat("Min threads                : {0}\n", minThreads);

bin/OpenSimDefaults.ini

@@ -2092,6 +2092,8 @@
     ; If true, this will print out an error if more than a minute has passed since the last simulator frame
     ; Also is another source of region statistics provided via the regionstats URL
     Enabled = true
+    ; next option may still use framework performance monitors designed for debug only, so avoid it
+    ServerStatsEnabled = false
 
 
 [WebStats]