diff --git a/htroot/PerformanceQueues_p.html b/htroot/PerformanceQueues_p.html
index 1c96db534..bffa4268d 100644
--- a/htroot/PerformanceQueues_p.html
+++ b/htroot/PerformanceQueues_p.html
@@ -118,6 +118,8 @@ Changes take effect immediately</td>
 <td class="small" width="80">maximum Active</td>
 <td class="small" width="80">maximum Idle</td>
 <td class="small" width="80">minimum Idle</td>
+<td class="small" width="80">current Active</td>
+<td class="small" width="80">current Idle</td>
 <td class="small">Full Description</td>
 </tr>
 #{pool}#
@@ -126,11 +128,13 @@ Changes take effect immediately</td>
 <td class="small" align="right"><input name="#[name]#_maxActive" type="text" size="8" maxlength="8" value="#[maxActive]#"></td>
 <td class="small" align="right"><input name="#[name]#_maxIdle" type="text" size="8" maxlength="8" value="#[maxIdle]#"></td>
 <td class="small" align="right"><input name="#[name]#_minIdle" type="text" size="8" maxlength="8" value="#[minIdle]#"></td>
+<td class="small" align="right">#[numActive]#</td>
+<td class="small" align="right">#[numIdle]#</td>
 <td class="small" align="left"></td>
 </tr>
 #{/pool}#
 <tr class="TableCellLight">
-<td class="small" align="left" colspan="5">
+<td class="small" align="left" colspan="7">
 <input type="submit" name="poolConfig" value="Enter new Threadpool Configuration">
 Changes take effect immediately</td>
 </tr>
diff --git a/htroot/PerformanceQueues_p.java b/htroot/PerformanceQueues_p.java
index 04f9286af..cc3c2f445 100644
--- a/htroot/PerformanceQueues_p.java
+++ b/htroot/PerformanceQueues_p.java
@@ -279,19 +279,25 @@ public class PerformanceQueues_p {
         prop.put("pool_0_maxActive",crawlerPoolConfig.maxActive);
         prop.put("pool_0_maxIdle",crawlerPoolConfig.maxIdle);
         prop.put("pool_0_minIdle",crawlerPoolConfig.minIdle);
+        prop.put("pool_0_numActive",switchboard.cacheLoader.getNumActiveWorker());
+        prop.put("pool_0_numIdle",switchboard.cacheLoader.getNumIdleWorker());
         
         serverThread httpd = switchboard.getThread("10_httpd");
         GenericObjectPool.Config httpdPoolConfig = ((serverCore)httpd).getPoolConfig();
         prop.put("pool_1_name","httpd Session Pool");
         prop.put("pool_1_maxActive",httpdPoolConfig.maxActive);
         prop.put("pool_1_maxIdle",httpdPoolConfig.maxIdle);
-        prop.put("pool_1_minIdle",httpdPoolConfig.minIdle);     
+        prop.put("pool_1_minIdle",httpdPoolConfig.minIdle);  
+        prop.put("pool_1_numActive",((serverCore)httpd).getActiveSessionCount());
+        prop.put("pool_1_numIdle",((serverCore)httpd).getIdleSessionCount());
         
         GenericObjectPool.Config stackerPoolConfig = switchboard.sbStackCrawlThread.getPoolConfig();
         prop.put("pool_2_name","CrawlStacker Session Pool");
         prop.put("pool_2_maxActive",stackerPoolConfig.maxActive);
         prop.put("pool_2_maxIdle",stackerPoolConfig.maxIdle);
-        prop.put("pool_2_minIdle",stackerPoolConfig.minIdle);                
+        prop.put("pool_2_minIdle",stackerPoolConfig.minIdle);   
+        prop.put("pool_2_numActive",switchboard.sbStackCrawlThread.getNumActiveWorker());
+        prop.put("pool_2_numIdle",switchboard.sbStackCrawlThread.getNumIdleWorker());
         prop.put("pool",3);        
         
         // return rewrite values for templates
diff --git a/source/de/anomic/plasma/plasmaCrawlLoader.java b/source/de/anomic/plasma/plasmaCrawlLoader.java
index 4d199655c..4cdfc3bb2 100644
--- a/source/de/anomic/plasma/plasmaCrawlLoader.java
+++ b/source/de/anomic/plasma/plasmaCrawlLoader.java
@@ -200,6 +200,14 @@ public final class plasmaCrawlLoader extends Thread {
         }
     }
 
+    public int getNumIdleWorker() {
+        return crawlwerPool.getNumIdle();
+    }
+    
+    public int getNumActiveWorker() {
+        return size();
+    }
+    
     public int size() {
         return crawlwerPool.getNumActive();
     }
diff --git a/source/de/anomic/plasma/plasmaCrawlStacker.java b/source/de/anomic/plasma/plasmaCrawlStacker.java
index 061e14f52..34bd23061 100644
--- a/source/de/anomic/plasma/plasmaCrawlStacker.java
+++ b/source/de/anomic/plasma/plasmaCrawlStacker.java
@@ -137,6 +137,14 @@ public final class plasmaCrawlStacker {
         }
     }
     
+    public int getNumActiveWorker() {
+        return this.theWorkerPool.getNumActive();
+    }
+    
+    public int getNumIdleWorker() {
+        return this.theWorkerPool.getNumIdle();
+    }
+    
     public int size() {
         return this.queue.size();
     }
@@ -636,7 +644,9 @@ public final class plasmaCrawlStacker {
         public void destroyObject(Object obj) {
             if (obj instanceof Worker) {
                 Worker theWorker = (Worker) obj;
+                ((Worker)obj).setName("stackCrawlThread_destroyed");
                 theWorker.setStopped(true);
+                theWorker.interrupt();
             }
         }
         
@@ -719,6 +729,7 @@ public final class plasmaCrawlStacker {
             if (this.isClosed) return;
             if (obj instanceof Worker) {
                 try {
+                    ((Worker)obj).setName("stackCrawlThread_invalidated");
                     ((Worker)obj).setStopped(true);
                     super.invalidateObject(obj);
                 } catch (Exception e) {
@@ -834,6 +845,7 @@ public final class plasmaCrawlStacker {
             }
             
             public void run()  {
+                boolean interrupted = false;
                 this.running = true;
                 
                 try {
@@ -856,9 +868,10 @@ public final class plasmaCrawlStacker {
                         }
                     }
                 } catch (InterruptedException ex) {
+                    interrupted = true;
                     serverLog.logInfo("STACKCRAWL-POOL","Interruption of thread '" + this.getName() + "' detected.");
                 } finally {
-                    if (plasmaCrawlStacker.this.theWorkerPool != null) 
+                    if (plasmaCrawlStacker.this.theWorkerPool != null && !interrupted) 
                         plasmaCrawlStacker.this.theWorkerPool.invalidateObject(this);
                 }
             }