headius

These properties can be used to alter runtime behavior for perf or compatibility.
Specify them by passing -X<property>=<value>
  or if passing directly to Java, -Djruby.<property>=<value>
  or put <property>=<value> in .jrubyrc

compiler settings:

   compile.mode=[JIT, FORCE, OFF]
      Set compilation mode. JIT = at runtime; FORCE = before execution. Default is JIT.
   compile.dump=[true, false]