Linux下一种磁盘节能的预取算法①

数据预取常用来提升系统的性能与吞吐量，对磁盘的能耗考虑甚少。针对此问题，在传统算法之上通过延迟磁盘的异步预取，合并磁盘I／O操作，减少磁盘的能耗状态切换，延长连续休眠时间来达到节能的目的。也通过基于真实运行状态的模拟，对预取算法进行了评估和验证，得出改进后的预取在不影响性能的前提下比标准预取节省17％的能量。

A Disk Energy Saving of Perfecting Algorithms in Linux

Data prefeching is used to improve system performance and thuoughput, which ignores the disk energy comsumption. As for this problem, a delaying asynchronism prefeching, clusting disk I/O handle way is proposed based on tradition prefeching to reduce the disk state switching and extend the length of disk idle phases for saving power. We also validate and evaluate this algorithm based on the really running simulator. Our simulations show that compared to stand prefeching with negligible loss performance, our algorithm saves 17% more disk energy.