Disk Cache Architecture

随着微处理器性能和存储器容量的增加， 在过去五年中发生的重大事件之一， 高性能超级计算机和“杀手”之间的区别 micros”是I/O性能。 本研究的主要目的 调查的目的是通过以下方式提高I/O子系统的性能 提高磁盘缓存性能。 考虑的第一个任务是表征呈现给 磁盘控制器的I/O性能。 这些痕迹将 通过检测磁盘控制器的设备驱动程序来收集。 跟踪条目将带有时间戳，以便动态查看系统负载 可以得到 调查中的第二项任务是使用痕迹驱动模拟 研究各种磁盘缓存体系结构的性能。 一 这项任务的主要目标是找到利用这一地位的方法 磁盘访问延迟的依赖性。 因此，该项目将重点 使用利用磁盘状态知识的缓存策略。

With the increases in microprocessor performance and memory capacity that have occurred during the past five years, one of the major difference between high performance supercomputers and the "killer micros" is I/O performance. The primary objective of this investigation is to increase the performance of the I/O subsystem by increasing disk cache performance. The first task considered is to characterize the load presented to a disk controller by analyzing I/O performance. The traces will be collected by instrumenting the device driver for the disk controller. Trace entries will be timestamped so a dynamic view of the system load can be obtained. The second task in the investigation is to use trace-driven simulation to investigate the performance of various disk cache architectures. A major goal of this task is to find ways of exploiting the position dependent nature of disk access latency. Thus, the project will focus on using cache policies that utilize knowledge of the disk's state.