--- jdk11/src/hotspot/share/gc/shared/gc_globals.hpp	2018-04-20 08:14:25.796265133 +0200
+++ jdk11/src/hotspot/share/gc/shared/gc_globals.hpp	2018-04-20 08:15:53.656690011 +0200
@@ -640,7 +640,7 @@
           "Initial heap size (in bytes); zero means use ergonomics")        \
           constraint(InitialHeapSizeConstraintFunc,AfterErgo)               \
                                                                             \
-  product(size_t, MaxHeapSize, ScaleForWordSize(96*M),                      \
+  product(size_t, MaxHeapSize, ScaleForWordSize(512*M),                     \
           "Maximum heap size (in bytes)")                                   \
           constraint(MaxHeapSizeConstraintFunc,AfterErgo)                   \
                                                                             \