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Filename : Xusage.txt
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    -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
    -Xlog:<opts>      control JVM logging, use -Xlog:help for details
    -Xbatch           disable background compilation
    -Xms<size>        set initial Java heap size
    -Xmx<size>        set maximum Java heap size
    -Xss<size>        set java thread stack size
    -Xfuture          enable strictest checks, anticipating future default
    -Xrs              reduce use of OS signals by Java/VM (see documentation)
    -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.

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