def METHOD_NAME(old_dir, new_dir):
    for dirname in os.listdir(old_dir):
        old_run_dir = os.path.join(old_dir, dirname)
        new_run_dir = os.path.join(new_dir, dirname)
        if not os.path.isdir(old_run_dir):
            continue
        old_summary = get_summary(old_run_dir)
        new_summary = get_summary(new_run_dir)
        comp = RunComparison(old_summary, new_summary)
        header = [Style.BRIGHT + dirname + Style.RESET_ALL,
                  Style.BRIGHT + 'old' + Style.RESET_ALL,
                  # Numeric suffix (MiB, GiB, sec).
                  '',
                  'std_dev',
                  Style.BRIGHT + 'new' + Style.RESET_ALL,
                  # Numeric suffix (MiB, GiB, sec).
                  '',
                  'std_dev',
                  Style.BRIGHT + 'delta' + Style.RESET_ALL]
        rows = []
        for field in comp.iter_field_names():
            row = [field, comp.old(field), comp.old_suffix(field),
                   comp.old_stddev(field), comp.new(field),
                   comp.new_suffix(field), comp.new_stddev(field)]
            diff_percent = comp.diff_percent(field)
            diff_percent_str = '%.2f%%' % diff_percent
            if diff_percent < 0:
                diff_percent_str = (
                    Fore.GREEN + diff_percent_str + Style.RESET_ALL)
            else:
                diff_percent_str = (
                    Fore.RED + diff_percent_str + Style.RESET_ALL)
            row.append(diff_percent_str)
            rows.append(row)
        print(tabulate(rows, headers=header, tablefmt='plain'))
        print('')