Double-Word Alignment to 8-Byte Boundaries in the Heap

Double-word (longs and doubles) values are now aligned to 8-byte boundaries in the heap. This improves the performance of both native code and JIT-compiled Java code while ensuring correctness of volatile double-word values on SPARC systems. However, if your application allocates and retains many small objects, you may need to increase your heap size(s) slightly, since these objects will be allocated in multiples of 8 bytes, increasing your memory usage.