diff -r 7100059f7bfd -r 3d43bcfdf7e7 src/base/output.cc
--- a/src/base/output.cc	Mon May 14 20:31:33 2012 -0500
+++ b/src/base/output.cc	Fri May 18 17:37:25 2012 +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);
diff -r 7100059f7bfd -r 3d43bcfdf7e7 src/base/statistics.hh
--- a/src/base/statistics.hh	Mon May 14 20:31:33 2012 -0500
+++ b/src/base/statistics.hh	Fri May 18 17:37:25 2012 +0430
@@ -69,6 +69,7 @@
 #include "base/refcnt.hh"
 #include "base/str.hh"
 #include "base/types.hh"
+#include "base/callback.hh"
 
 class Callback;
 
@@ -3135,6 +3136,15 @@
  */
 void registerResetCallback(Callback *cb);
 
+inline CallbackQueue &
+getDumpQueue()
+{
+        static CallbackQueue dumpQueue;
+        return dumpQueue;
+}
+
+void registerDumpCallback(Callback *cb);
+
 std::list<Info *> &statsList();
 
 } // namespace Stats
diff -r 7100059f7bfd -r 3d43bcfdf7e7 src/base/statistics.cc
--- a/src/base/statistics.cc	Mon May 14 20:31:33 2012 -0500
+++ b/src/base/statistics.cc	Fri May 18 17:37:25 2012 +0430
@@ -458,6 +458,12 @@
     _enabled = true;
 }
 
+void
+registerDumpCallback(Callback *cb)
+{
+        getDumpQueue().add(cb);
+}
+
 } // namespace Stats
 
 void
diff -r 7100059f7bfd -r 3d43bcfdf7e7 src/base/stats/text.cc
--- a/src/base/stats/text.cc	Mon May 14 20:31:33 2012 -0500
+++ b/src/base/stats/text.cc	Fri May 18 17:37:25 2012 +0430
@@ -51,6 +51,9 @@
 #include "base/cast.hh"
 #include "base/misc.hh"
 #include "base/str.hh"
+#include "../statistics.hh"
+
+using namespace Stats;
 
 using namespace std;
 
@@ -147,6 +150,7 @@
 {
     ccprintf(*stream, "\n---------- End Simulation Statistics   ----------\n");
     stream->flush();
+    getDumpQueue().process();
 }
 
 bool
diff -r 7100059f7bfd -r 3d43bcfdf7e7 src/mem/ruby/profiler/Profiler.cc
--- a/src/mem/ruby/profiler/Profiler.cc	Mon May 14 20:31:33 2012 -0500
+++ b/src/mem/ruby/profiler/Profiler.cc	Fri May 18 17:37:25 2012 +0430
@@ -72,7 +72,7 @@
     m_inst_profiler_ptr = NULL;
     m_address_profiler_ptr = NULL;
 
-    m_real_time_start_time = time(NULL); // Not reset in clearStats()
+    m_real_time_start_time = time(NULL);
     m_stats_period = 1000000; // Default
     m_periodic_output_file_ptr = &cerr;
 
@@ -447,7 +447,7 @@
 Profiler::clearStats()
 {
     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) {
diff -r 7100059f7bfd -r 3d43bcfdf7e7 src/mem/ruby/system/System.hh
--- a/src/mem/ruby/system/System.hh	Mon May 14 20:31:33 2012 -0500
+++ b/src/mem/ruby/system/System.hh	Fri May 18 17:37:25 2012 +0430
@@ -179,20 +179,28 @@
     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;
     }
 
     virtual void process();
 };
-
 #endif // __MEM_RUBY_SYSTEM_SYSTEM_HH__
diff -r 7100059f7bfd -r 3d43bcfdf7e7 src/mem/ruby/system/System.cc
--- a/src/mem/ruby/system/System.cc	Mon May 14 20:31:33 2012 -0500
+++ b/src/mem/ruby/system/System.cc	Fri May 18 17:37:25 2012 +0430
@@ -40,6 +40,9 @@
 #include "mem/ruby/system/System.hh"
 #include "sim/eventq.hh"
 #include "sim/simulate.hh"
+#include "../../../base/statistics.hh"
+
+using namespace Stats;
 
 using namespace std;
 
@@ -86,11 +89,12 @@
         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;
 }
@@ -472,12 +476,15 @@
     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);
     RubySystem::printConfig(*os);