面向Cell宽带引擎架构的异构多核访存技术  

A Memory Access Technology of Heterogeneous Multi-Core System Based on Cell Broadband Engine Architecture

作　　者：冯国富[1] 董小社[1] 丁彦飞[1] 王旭昊[1] 

机构地区：[1]西安交通大学计算机科学与技术系,西安710049

出　　处：《西安交通大学学报》2009年第2期1-5,共5页Journal of Xi'an Jiaotong University

基　　金：国家高技术研究发展计划资助项目(2006AA01A109;2004AA111110);国家自然科学基金资助项目(60773118)

摘　　要：针对Cell宽带引擎架构（CBEA）多核高性能处理器要求软件显式地对分层存储结构进行管理，带来架构的可编程性及性能等问题，提出了一种基于CBEA的异构多核访存技术．将CBEA访存分为批量访存和按需访存；通过合理部署数据缓冲区来减小批量访存计算中的片内访存开销，利用支持粗粒度访问的软件管理cache及数据预取来降低按需访存的片外访存开销；以访存接口库的方式来改善软件的可编程性．实验结果表明，所提技术的访存接口库在批量访存方式下的性能比ALF和CellSs提高了30％～50％，按需访存中软件管理cache性能比CBE软件开发工具包提高了20％～30％，4路数据预取访存比单路缓存的性能提高约50％．A memory access technology is proposed to solve the problems of programming and performance caused by explicit management for multi-level memory hierarchies of Cell broadband engine architecture （CBEA）. The access to main memory on CBEA is classified into two major types： bulk data transfer and on-demand data transfer. For bulk data transfer, the overhead of on-chip memory access is reduced by proper organization of data buffer. Meanwhile, a softwaremanaged cache supporting coarse-grained access and data pre-fetch are adopted to enhance the performance of on-demand off-chip data transfer. In order to facilitate programming, a memory access library based on the proposed methods is implemented. Experimental results show that the performance of applications based on the proposed bulk data transfer technology is about 30%- 50% higher than that of applications based on ALF and CellSs. For on-demand data transfer, the proposed software-managed cache performs about 20%-30% better than that of CBE SDK does, and the data prefetch technology based on four-buffer gets about 50% performance increase compared to single-buffer cache.

关 键 词：异构多核 访存技术 分层存储结构 Cell宽带引擎架构 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]