基于存储管理抖动问题的研究

On the Thrashing of Storage Management

1抖动问题的形成 虚拟存储技术是实现主存扩充的有效方法,已被广泛使用在现代的各种计算机系统中.多用户系统的虚拟存储器,利用大容量的外存空间来逻辑扩充内存,提供了一种将内存和外存统一管理的方法,内存中只存放那些经常的、反复被调用和访问的程序段和数据,而进程或作业的其它部分则存放于外存中,待需要时再调入内存.虚拟存储器可理解成一个由主存储器和辅助存储器构成的地址空间,最大虚拟地址空间往往取决于指令中的地址长度.

The thrashing problem of virtual storage management is a result of complex factors of the system. It consumes system resources, and undermines the efficiency of the system. The author of this article analyzes the relationship between thrashing problem and working set and replacement algorithm and the behavior properties of programs,and raises the possible solutions to remove the thrashing problem.