    -Xmixed           mixed mode execution (default)
    -Xint             interpreted mode execution only
    -Xbootclasspath:<directories and zip/jar files separated by :>
                      set search path for bootstrap classes and resources
    -Xbootclasspath/a:<directories and zip/jar files separated by :>
                      append to end of bootstrap class path
    -Xbootclasspath/p:<directories and zip/jar files separated by :>
                      prepend in front of bootstrap class path
    -Xnoclassgc       disable class garbage collection
    -Xincgc           enable incremental garbage collection
    -Xloggc:<file>    log GC status to a file with time stamps
    -Xoptgc           Improves garbage collection performance of
                      applications with mostly short-lived objects.
    -Xverbosegc<options>
                      output Java heap information during garbage collection
                      (use -Xverbosegc:help for options)
    -Xbatch           disable background compilation
    -Xms<size>        set initial Java heap size. example: -Xms32m
    -Xmx<size>        set maximum Java heap size. example: -Xmx64m
    -Xmn<size>        set new generation Java heap size. example: -Xmn64m
    -Xss              set Java thread stack size. example: -Xss128k
    -Xprof            output cpu profiling data
    -Xeprof:<options> output profile data for HPjmeter
                      (use -Xeprof:help for options)
    -Xfuture          enable strictest checks, anticipating future default
    -Xrs              reduce use of OS signals by Java/VM (see documentation)
    -Xusealtsigs      use alternate signals for vm signals instead of SIGUSR[12]
    -Xcheck:jni       perform additional checks for JNI functions
    -Xshare:off       do not attempt to use shared class data
    -Xshare:auto      use shared class data if possible (default)
    -Xshare:on        require using shared class data, otherwise fail.
    -Xprep<options>   use dynamic bytecode preprocessor for loaded classes
    -XdoCloseWithReadPending
                      enable non-blocking close operations
    -Xnocatch         disable the catch all signal handler
    -Xmpas:on         enable HPUX MPAS addressing mode, otherwise fail
    -Xmpas:off        do not attempt to enable HPUX MPAS addressing mode

The -X options are non-standard and subject to change without notice.
