docs: def count_processors():
      """How many cores does the current computer have ?"""
      if 'SLURM_NTASKS' in os.environ: return int(os.environ['SLURM_NTASKS'])
      elif 'SLURM_JOB_CPUS_PER_NODE' in os.environ:
           text = os.environ['SLURM_JOB_CPUS_PER_NODE']
           if is_integer(text): return int(text)
           else:
              n, N = re.findall("([1-9]+)\(x([1-9]+)\)", text)[0]
              return int(n) * int(N)
      else: return multiprocessing.cpu_count()