/usr/java/latest/bin/java -XX:+PrintFlagsFinal -version | grep HeapSize
uintx ErgoHeapSizeLimit                    = 0                {product}
uintx InitialHeapSize                     := 527314944        {product}
uintx LargePageHeapSizeThreshold           = 134217728        {product}
uintx MaxHeapSize                         := 8438939648       {product}
java version "1.6.0_24"
Java(TM) SE Runtime Environment (build 1.6.0_24-b07)
Java HotSpot(TM) 64-Bit Server VM (build 19.1-b02, mixed mode)