碎片影响闪存性能分析与改进  

Performance Analysis and Improvement of Flash Under Fragmentations

作　　者：张翔立[1] 翟建东[1] 

机构地区：[1]华中科技大学信息与系统技术研究所,湖北武汉430074

出　　处：《计算机工程与科学》2011年第1期66-69,共4页Computer Engineering & Science

摘　　要：闪存中不存在机械装置,因此碎片对闪存性能产生影响的原因不是由于寻找时间的增加,而是由闪存自身的特点所造成的。通过引入FTL,使得现有的文件系统可以直接应用到闪存,但FTL也是引起碎片对闪存性能影响的原因。本文对基于日志的FTL进行分析,当闪存中存在碎片时,FTL合并方式的不同引起了闪存性能的下降,根据此原因提出填补间隔的改进方案,并论证了此方案的有效性。Unlike a hard disk, there is no mechanical parts in flash. Therefore, the reason of disk fragmentation weakening the performance of the flash is not seekdelay, but is its own characteristics. Through inducting the Flash Translation Layer（FTL）, the existing file system can directly be applied to the flash. At the same time, FTL is the reason of performance degradation of flash under？ fragmentations. When there is some fragmentations in flash, the difference of merge operation types result in the performance degradation. On the basicis of？ reason analysis,a scheme of padding the spacing is put forward and its validity is demonstrated.

关 键 词：闪存 闪存转换层 碎片 合并 

分 类 号：TP333[自动化与计算机技术—计算机系统结构]