some fixes for performance measurments and added plot
diff --git a/src/main/java/net/onrc/onos/ofcontroller/flowmanager/ParallelFlowDatabaseOperation.java b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/ParallelFlowDatabaseOperation.java
index 50834d2..55aeb97 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/flowmanager/ParallelFlowDatabaseOperation.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/flowmanager/ParallelFlowDatabaseOperation.java
@@ -268,7 +268,7 @@
 	    PerformanceMonitor.Measurement m;
 	    m = PerformanceMonitor.start(tag1);
 	    boolean success = FlowDatabaseOperation.addFlow(dbHandler, flowPath);
-	    PerformanceMonitor.stop(tag1);
+//	    PerformanceMonitor.stop(tag1);
 	    m.stop();
 	    m = PerformanceMonitor.start(tag2);
 	    if(success) {