diff -ru a/src/base/output.cc b/src/base/output.cc
--- a/src/base/output.cc	2012-05-13 10:03:36.000000000 +0430
+++ b/src/base/output.cc	2012-05-16 22:00:06.463197683 +0430
@@ -86,6 +86,9 @@
         files[filename] = file;
         return file;
     } else {
+        map_t::iterator it = files.find(filename);
+        if(it != files.end())
+        	return it->second;        
         ofstream *file = new ofstream(filename.c_str(), mode);
         if (!file->is_open())
             fatal("Cannot open file %s", filename);
Only in b/src/base: output.cc~
diff -ru a/src/base/statistics.cc b/src/base/statistics.cc
--- a/src/base/statistics.cc	2012-05-13 10:03:36.000000000 +0430
+++ b/src/base/statistics.cc	2012-05-16 22:08:39.689742649 +0430
@@ -457,6 +457,12 @@
 
     _enabled = true;
 }
+    
+void
+registerDumpCallback(Callback *cb)
+{
+	getDumpQueue().add(cb);
+}
 
 } // namespace Stats
 
Only in b/src/base: statistics.cc~
diff -ru a/src/base/statistics.hh b/src/base/statistics.hh
--- a/src/base/statistics.hh	2012-05-13 10:03:36.000000000 +0430
+++ b/src/base/statistics.hh	2012-05-16 21:59:06.338899550 +0430
@@ -70,6 +70,8 @@
 #include "base/str.hh"
 #include "base/types.hh"
 
+#include "base/callback.hh"
+
 class Callback;
 
 /** The current simulated tick. */
@@ -3137,6 +3139,15 @@
 
 std::list<Info *> &statsList();
 
+inline CallbackQueue &
+getDumpQueue()
+{
+	static CallbackQueue dumpQueue;
+	return dumpQueue;
+}
+
+void registerDumpCallback(Callback *cb);
+
 } // namespace Stats
 
 #endif // __BASE_STATISTICS_HH__
Only in b/src/base: statistics.hh~
diff -ru a/src/base/stats/text.cc b/src/base/stats/text.cc
--- a/src/base/stats/text.cc	2012-05-13 10:03:36.000000000 +0430
+++ b/src/base/stats/text.cc	2012-05-16 22:13:26.747166083 +0430
@@ -52,6 +52,10 @@
 #include "base/misc.hh"
 #include "base/str.hh"
 
+#include "../statistics.hh"
+
+using namespace Stats;
+
 using namespace std;
 
 #ifndef NAN
@@ -147,6 +151,7 @@
 {
     ccprintf(*stream, "\n---------- End Simulation Statistics   ----------\n");
     stream->flush();
+    getDumpQueue().process();
 }
 
 bool
Only in b/src/base/stats: text.cc~
diff -ru a/src/mem/ruby/profiler/Profiler.cc b/src/mem/ruby/profiler/Profiler.cc
--- a/src/mem/ruby/profiler/Profiler.cc	2012-05-13 10:03:42.000000000 +0430
+++ b/src/mem/ruby/profiler/Profiler.cc	2012-05-16 22:05:52.400913111 +0430
@@ -448,6 +448,8 @@
 {
     m_ruby_start = g_eventQueue_ptr->getTime();
 
+    m_real_time_start_time = time(NULL);
+
     m_cycles_executed_at_start.resize(m_num_of_sequencers);
     for (int i = 0; i < m_num_of_sequencers; i++) {
         if (g_system_ptr == NULL) {
Only in b/src/mem/ruby/profiler: Profiler.cc~
diff -ru a/src/mem/ruby/system/System.cc b/src/mem/ruby/system/System.cc
--- a/src/mem/ruby/system/System.cc	2012-05-13 10:03:42.000000000 +0430
+++ b/src/mem/ruby/system/System.cc	2012-05-16 22:12:07.122771254 +0430
@@ -41,6 +41,10 @@
 #include "sim/eventq.hh"
 #include "sim/simulate.hh"
 
+#include "../../../base/statistics.hh"
+
+using namespace Stats;
+
 using namespace std;
 
 int RubySystem::m_random_seed;
@@ -86,11 +90,12 @@
         m_mem_vec_ptr->resize(m_memory_size_bytes);
     }
 
-    //
-    // Print ruby configuration and stats at exit
-    //
-    RubyExitCallback* rubyExitCB = new RubyExitCallback(p->stats_filename);
-    registerExitCallback(rubyExitCB);
+    ResetRubyStatsCallback* resetRubyStatsCB = new ResetRubyStatsCallback();
+    Stats::registerResetCallback(resetRubyStatsCB);
+    
+    DumpRubystatsCallback* dumpRubyStatsCB = new DumpRubystatsCallback(p->stats_filename);
+    Stats::registerDumpCallback(dumpRubyStatsCB);
+    
     m_warmup_enabled = false;
     m_cooldown_enabled = false;
 }
@@ -472,14 +477,17 @@
     return new RubySystem(this);
 }
 
-/**
- * virtual process function that is invoked when the callback
- * queue is executed.
- */
 void
-RubyExitCallback::process()
+ResetRubyStatsCallback::process()
+{
+	RubySystem::m_profiler_ptr->clearStats();
+    RubySystem::getNetwork()->clearStats();
+}
+
+void
+DumpRubystatsCallback::process()
 {
-    std::ostream *os = simout.create(stats_filename);
+	std::ostream *os = simout.create(stats_filename);
     RubySystem::printConfig(*os);
     *os << endl;
     RubySystem::printStats(*os);
Only in b/src/mem/ruby/system: System.cc~
diff -ru a/src/mem/ruby/system/System.hh b/src/mem/ruby/system/System.hh
--- a/src/mem/ruby/system/System.hh	2012-05-13 10:03:42.000000000 +0430
+++ b/src/mem/ruby/system/System.hh	2012-05-16 22:04:43.600571952 +0430
@@ -179,15 +179,24 @@
     return out;
 }
 
-class RubyExitCallback : public Callback
+class ResetRubyStatsCallback : public Callback
+{
+
+  public:
+    virtual ~ResetRubyStatsCallback() {}
+
+    virtual void process();
+};
+
+class DumpRubystatsCallback : public Callback
 {
   private:
     std::string stats_filename;
 
   public:
-    virtual ~RubyExitCallback() {}
+    virtual ~DumpRubystatsCallback() {}
 
-    RubyExitCallback(const std::string& _stats_filename)
+    DumpRubystatsCallback(const std::string& _stats_filename)
     {
         stats_filename = _stats_filename;
     }
Only in b/src/mem/ruby/system: System.hh~