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diff --git a/src/mem/ruby/tester/Tester.cc b/src/mem/ruby/tester/Tester.cc
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+++ b/src/mem/ruby/tester/Tester.cc
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+
+/*
+ * Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * $Id$
+ *
+ */
+
+#include "Global.hh"
+#include "System.hh"
+#include "Tester.hh"
+#include "EventQueue.hh"
+#include "SubBlock.hh"
+#include "Check.hh"
+#include "Chip.hh"
+
+Tester::Tester(System* sys_ptr)
+{
+  if (g_SIMICS) {
+    ERROR_MSG("g_SIMICS should not be defined.");
+  }
+
+  g_callback_counter = 0;
+
+  // add the tester consumer to the global event queue
+  g_eventQueue_ptr->scheduleEvent(this, 1);
+
+  m_last_progress_vector.setSize(RubyConfig::numberOfProcessors());
+  for (int i=0; i<m_last_progress_vector.size(); i++) {
+    m_last_progress_vector[i] = 0;
+  }
+}
+
+Tester::~Tester()
+{
+}
+
+void Tester::hitCallback(NodeID proc, SubBlock& data, CacheRequestType type, int thread)
+{
+  // Mark that we made progress
+  m_last_progress_vector[proc] = g_eventQueue_ptr->getTime();
+  g_callback_counter++;
+
+  // This tells us our store has 'completed' or for a load gives us
+  // back the data to make the check
+  DEBUG_EXPR(TESTER_COMP, MedPrio, proc);
+  DEBUG_EXPR(TESTER_COMP, MedPrio, data);
+  Check* check_ptr = m_checkTable.getCheck(data.getAddress());
+  assert(check_ptr != NULL);
+  check_ptr->performCallback(proc, data);
+
+}
+
+void Tester::wakeup()
+{
+  if (g_callback_counter < g_tester_length) {
+    // Try to perform an action or check
+    Check* check_ptr = m_checkTable.getRandomCheck();
+    assert(check_ptr != NULL);
+    check_ptr->initiate();
+
+    checkForDeadlock();
+
+    g_eventQueue_ptr->scheduleEvent(this, 2);
+  }
+}
+
+void Tester::checkForDeadlock()
+{
+  int size = m_last_progress_vector.size();
+  Time current_time = g_eventQueue_ptr->getTime();
+  for (int processor=0; processor<size; processor++) {
+    if ((current_time - m_last_progress_vector[processor]) > g_DEADLOCK_THRESHOLD) {
+      WARN_EXPR(current_time);
+      WARN_EXPR(m_last_progress_vector[processor]);
+      WARN_EXPR(current_time - m_last_progress_vector[processor]);
+      WARN_EXPR(processor);
+      Sequencer* seq_ptr = g_system_ptr->getChip(processor/RubyConfig::numberOfProcsPerChip())->getSequencer(processor%RubyConfig::numberOfProcsPerChip());
+      assert(seq_ptr != NULL);
+      WARN_EXPR(*seq_ptr);
+      ERROR_MSG("Deadlock detected.");
+    }
+  }
+}
+
+void Tester::print(ostream& out) const
+{
+  out << "[Tester]" << endl;
+}
+