本科生毕业论文Cache(高速缓存)及主存一致性.doc

本科生毕业论文(设计) Cache(高速缓存)与主存一致性初探 院系名称 信息工程系 姓　　名 学　　号 专　　业 指导教师 2012年月日关键词： Abstract Memory is a memory function components , it in a computer system occupies a very important position . The basic function of memory is stored in binary form of said programs and data . How to design capacity , speed is quick and low cost of memory , is always the key problems in the development of the computer , there is no memory function fully meet the needs of the memory of a computer system. Therefore, the computer system usually equipped with a layered structure of storage system, to satisfy the capacity, speed and cost requirements. Measure memory has three index : capacity , speed and price/a. Generally speaking , the high speed of memory, every price is high , therefore capacity can not be too big . So memory design constraints capacity , speed and price . There seems to be no limit capacity , no matter how much capacity , the total to develop applications to use . In order to obtain the better performance, the speed of the memory must be able to keep up with the CPU,and that is when the CPU executing instructions , dont want him to stop and wait for instructions or operand. The question of price must also consider, for practical system, memory prices relative to other parts must be is reasonable. So the three indexes to weigh between. Cache system can ensure cache memory and main memory contents consistency , the directly related to the entire computer system performance . The two parts of the data consistency issues of two reasons : first , because of the CPU cache memory write led to its contents to update the memory and out-of-date contents ; Second , because of I/O processor or multi-processor systems of a processor modified the main memory contents lead to cache content obsolete . According to different reasons , analyzes the strategy of written seven kinds of solutions, and the cache system USES 2 to tak