说明：  设计内存池的目标是为了保证服务器长时间高效的运行，通过对申请空间小而申请频繁的对象进行有效管理，减少内存碎片的产生，合理分配管理用户内存，从而减少系统中出现有效空间足够，而无法分配大块连续内存的情况。
(The goal of the design of the memory pool is a long time in order to ensure efficient operation of the server, through the application of space applications for small and frequent targets of effective management and reduce memory fragmentation, a rational allocation of the management of user memory, thereby reducing the effective space systems appear adequate, could not be allocated chunk of memory for the situation.)