diff -r 15c04fe93c18 -r 0c039865ef2b src/share/vm/runtime/os.hpp
--- a/src/share/vm/runtime/os.hpp	Wed Apr 03 09:19:02 2013 +0200
+++ b/src/share/vm/runtime/os.hpp	Thu Apr 04 19:07:32 2013 +0200
@@ -180,7 +180,7 @@
   // Interface for detecting multiprocessor system
   static inline bool is_MP() {
     assert(_processor_count > 0, "invalid processor count");
-    return _processor_count > 1;
+    return _processor_count > 1 || AssumeMP;
   }
   static julong available_memory();
   static julong physical_memory();