一个好的计算机系统不仅要有一个足够容量的、存取速度高的、稳定可靠的主存储器，而且要能合理地分配和使用这些存储空间。当用户提出申请存储器空间时，存储管理必须根据申请者的要求，按一定的策略分析主存空间的使用情况，找出足够的空闲区域分配给申请者。-A good computer system will not only have a sufficient capacity, access speed of high, stable and reliable main memory, but also to rational allocation and use of such storage space. When the user submit an application memory space, storage management must be based on the applicant s request, according to a certain degree of strategic analysis of the use of main memory space, and find out enough free area allocated to the applicants.