title: How many CPU cores used for Google App Engine instance classes
body: <p>Is there any technical documentation and details on the numbers of CPU cores used for the different Google App Engine instance Classes (B1-B8)?</p>
  
  <p>If some instance classes use several CPU cores, it could be taken into consideration to get more real concurrency (as in concurrent multi processing, <strong>not</strong> as in threading because of GIL).</p>