title: How to know region size used of G1 garbage collector?
body: <p>I'm currently looking into G1 GC in latest Java 8 version.</p>
  
  <p>I have issues with "Humongous Allocation" so I wanna know how big my region size is.</p>
  
  <p>How can I find out how big the region size is set? </p>
  
  <p>How can I calculate the region size myself?</p>
  
  <p>Thanks</p>