基于外存性能模型的多通道并行I／O

I／O部分一直是制约计算机系统整体性能提升的瓶颈。本文提出外存性能模型，用于定量分析外存的I／O性能并帮助克服I／O瓶颈，并在此基础上，提出用多通道I／O克服PCI总线瓶颈。采用多钱程控制和异步I／O技术，使所有通道的磁盘并行工作。对比实．验表明，最大顺序读性能提升了46％，顺序写提升48％，随机读提升4％，随机写提升57％。

Multi-channel Parallel I/O Based on Secondary Storage Performance Model

The I/O part has been the bottleneck of the performance of whole computer system for many years A quantitative approach, the Secondary Storage Performance Model, is put forward to evaluate the performance of secondary storage and overcome the I/O bottlenecks. Based on the model, a method that surpasses the bottleneck of PCI bus by using multi-channel I/O is advocated. With multi-threads control and asynchronous I/O technique, the disks connected on different channels can work in parallel. A comparative experiment shows, the highest performance of sequential read, sequential write, random read and random write have been improved by 46%, 48%, 40/, and 57% respectively.