http://java.sun.com/docs/hotspot/VMOptions.html -Xms: Sets the initial size of the heap. -Xmx: Sets the maximum size of the heap. -Xmn: Set the size of the young generation (available beginning in J2SE 1.4.0). -XX:LargePageSizeInBytes: Sets the large page size used for the Java heap. Set to 2m when running 32-bit JVM on Solaris 10 x86 with AMD64 CPUs. Solaris Only. Defaults (SPARC: 8m, x86: 4m, x86_64: 2m) -Xbatch: Disables background compilation. -Xss: Sets the Java thread stack size.