protected static function _profilerFormatMark(array $mark)
    {
        return sprintf("%0.3f sec (+%.3f); %0.3f MB (%s%0.3f) - %s",
            (float)$mark['time'],
            (float)$mark['timeDiff'],
            ($mark['memory'] / 1024 / 1024),
            ($mark['memoryDiff'] / 1024 / 1024 >= 0) ? '+' : '',
            ($mark['memoryDiff'] / 1024 / 1024),
            $mark['label']
        );
    }