diff --git a/src/share/vm/runtime/globals.hpp b/src/share/vm/runtime/globals.hpp
--- openjdk/hotspot/src/share/vm/runtime/globals.hpp
+++ openjdk/hotspot/src/share/vm/runtime/globals.hpp
@@ -530,7 +530,7 @@
   lp64_product(intx, ObjectAlignmentInBytes, 8,                             \
           "Default object alignment in bytes, 8 is minimum")                \
                                                                             \
-  product(bool, AssumeMP, false,                                            \
+  product(bool, AssumeMP, true,                                             \
           "Instruct the VM to assume multiple processors are available")    \
                                                                             \
   /* UseMembar is theoretically a temp flag used for memory barrier         \