From 0094556d04add28d5a36c653b39901b93f0a69ba Mon Sep 17 00:00:00 2001
From: diva
Date: Thu, 28 May 2009 21:04:10 +0000
Subject: Instrumenting GlynnTuckerCache to find out the hit rate.

---
 .../CoreModules/Asset/GlynnTuckerAssetCache.cs     | 29 ++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/OpenSim/Region/CoreModules/Asset/GlynnTuckerAssetCache.cs b/OpenSim/Region/CoreModules/Asset/GlynnTuckerAssetCache.cs
index f784c1b..9f02868 100644
--- a/OpenSim/Region/CoreModules/Asset/GlynnTuckerAssetCache.cs
+++ b/OpenSim/Region/CoreModules/Asset/GlynnTuckerAssetCache.cs
@@ -48,6 +48,9 @@ namespace OpenSim.Region.CoreModules.Asset
         private bool m_Enabled = false;
         private ICache m_Cache = new GlynnTucker.Cache.SimpleMemoryCache();
 
+        // Instrumentation
+        private uint m_DebugRate = 0;
+
         public string Name
         {
             get { return "GlynnTuckerAssetCache"; }
@@ -68,6 +71,11 @@ namespace OpenSim.Region.CoreModules.Asset
 
                     m_log.Info("[ASSET CACHE]: GlynnTucker asset cache enabled");
 
+                    // Instrumentation
+                    IConfig cacheConfig = source.Configs["AssetCache"];
+                    if (cacheConfig != null)
+                        m_DebugRate = (uint)cacheConfig.GetInt("DebugRate", 0);
+
                 }
             }
         }
@@ -104,10 +112,31 @@ namespace OpenSim.Region.CoreModules.Asset
                 m_Cache.AddOrUpdate(asset.ID, asset);
         }
 
+        private ulong m_Hits = 0;
+        private ulong m_Requests = 0;
+        private void Debug(Object asset)
+        {
+            // Temporary instrumentation to measure the hit/miss rate
+            if (m_DebugRate > 0)
+            {
+                m_Requests++;
+                if (asset != null)
+                    m_Hits++;
+
+                if ((m_Requests % m_DebugRate) == 0)
+                    m_log.DebugFormat("[ASSET CACHE]: Hit Rate {0} / {1} == {2}%", m_Hits, m_Requests, ((float)m_Hits / m_Requests) * 100);
+
+            }
+            // End instrumentation
+        }
+
         public AssetBase Get(string id)
         {
             Object asset = null;
             m_Cache.TryGet(id, out asset);
+
+            Debug(asset);
+
             return (AssetBase)asset;
         }
 
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