@Before
 public void beforeMss() {
   this.before = MemSnapshot.take();
 }
 @After
 public void afterMss() {
   compareMss(name.getMethodName(), this.before, MemSnapshot.take());
 }
 private static void compareMss(String hdr, MemSnapshot before, MemSnapshot after) {
   MemSnapshot.used(before, after).print(hdr);
 }