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过去的20年里面,主存与硬盘的性能差距以每年50%的速度飞速扩大.造成这种局面的主要原因是磁盘机械器件延迟导致的其性能提升缓慢(每年8%的性能提升).磁盘内部缓存管理对于磁盘的性能有着重要的影响,因为它起到平衡快总线与慢机械器件的中间栋梁作用.缓存介质一般为SRAM,成本昂贵并且容量低.因此,磁盘生产商不会给磁盘装备大容量的缓存.本文提出了一个新的思路来改善这个问题,通过压缩磁盘缓存,提高缓存有效容量以预取更多的数据.为了降低压缩所带来的复杂度与负作用,我们只压缩读请求服务后预取的数据.通过Disksim模拟实现,并测试合成负载,我们得到了较好的结果.实验证明,随着压缩率的改善,磁盘平均响应时间最大减少43.5%,命中率最高提高到3倍.
Over the past two decades, the performance gap between main memory and hard disks has ballooned at 50% a year, mainly due to slow performance gains of 8% per year due to delays in disk mechanics. Internal cache management has a significant impact on the performance of your disk because it serves as an intermediate pillars of balancing fast busses with slower mechanical devices, which are typically SRAM, expensive, and low-capacity, so disk manufacturers do not give disk gear High-capacity cache.This paper presents a new idea to improve this problem, by compressing the disk cache, improve the effective capacity of the cache to prefetch more data.In order to reduce the complexity and negative effects caused by compression, we only compress Read the prefetched data after the request service.We achieved good results through Disksim simulation and test the composite load.Experimental results show that with the improvement of compression ratio, the average disk response time is reduced by 43.5% and the highest hit rate To three times.