code: def get_cpu_usage(user=None, ignore_self=True):
      
      pid = os.getpid()
      cmd = "ps aux"
      output = getoutput(cmd)
      total = 0
      largest_process = 0
      largest_process_name = None
      for row in output.split('\n')[1:]:
          row = row.split()
          if row[1] == str(pid) and ignore_self:
              continue
          if user is None or user == row[0]:
              cpu = decimal.Decimal(row[2])
              if cpu > total:
                  largest_process = cpu
                  largest_process_name = ' '.join(row[10:len(row)])
              total += decimal.Decimal(row[2])
      return total, largest_process, largest_process_name
docs: Returns the total CPU usage for all available cores.
  
      :param user: If given, returns only the total CPU usage of all processes
        for the given user.
      :param ignore_self: If ``True`` the process that runs this script will
        be ignored.