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 process, in addition to a list is given, and display end time, and duration of the process.