title: parallelize optimization tests when building python from source
body: <p>When compiling Python from source, there is a popular option to <code>--enable-optimizations</code> which runs a bunch of tests and then adds optimizations to the compiled runtime.</p>
  
  <p>Is it possible to parallelize the running of the tests given multiple cores on the system, à la <code>make -j8</code> given 8 cores?</p>