每秒统计一次当前系统的进程状况，并按照内存使用自多到少排序打印输出相关信息。对已经结束的进程，另外给出一个列表，并显示该进程的结束时间和持续时间。-Statistics once the current system status of the process, in accordance with the memory usage from more to less printout of the relevant information per second. The end of the