diff --git a/shared.py b/shared.py
index 27e100b..6c8f7f3 100644
--- a/shared.py
+++ b/shared.py
@@ -91,8 +91,8 @@ def simulationAcceptsFlag(f, checkOutput=True, cwd=None, isWin=False):
     else:
         subprocess.check_output("./HelloWorld %s" % f, shell=True, stderr=subprocess.STDOUT, cwd=cwd)
 
-    if (not os.path.exists("HelloWorld_res.mat")):
-      print("Result file HelloWorld_res.mat WAS NOT generated running: ./HelloWorld with flags [%s]" % f)
+    #if (not os.path.exists("HelloWorld_res.mat")):
+    #  print("Result file HelloWorld_res.mat WAS NOT generated running: ./HelloWorld with flags [%s]" % f)
     if (not checkOutput) or os.path.exists("HelloWorld_res.mat"):
       return True
   except subprocess.CalledProcessError as e:
diff --git a/testmodel.py b/testmodel.py
index 1e3ba20..972ea1b 100755
--- a/testmodel.py
+++ b/testmodel.py
@@ -44,7 +44,11 @@ def writeResult():
 
 def writeResultAndExit(exitStatus):
   writeResult()
-  sys.exit(exitStatus)
+  print("Calling exit ...")
+  sys.stdout.flush()
+  os._exit(exitStatus)
+  # calling sys.exit will hang in lock.acquire()
+  # sys.exit(exitStatus)
 
 def sendExpressionTimeout(omc, cmd, timeout):
   with open(errFile, 'a+') as fp: