code: def total(self):
          
          if self.system_total.available:
              return self.system_total.vsz
          elif self.asizeof_total: # pragma: no cover
              return self.asizeof_total
          else: # pragma: no cover
              return self.tracked_total
docs: Return the total (virtual) size of the process in bytes. If process
          information is not available, get the best number available, even if it
          is a poor approximation of reality.