片上多核处理器的区域共享的双粒度目录

发布时间：2018-06-24 14:03

本文选题：双粒度目录(DGD) + 片上多核处理器　；参考：《高技术通讯》2015年07期

【摘要】：研究了双粒度目录(DGD)下片上多核处理器的访存行为以及DGD对不同共享行为的目录开销,以进一步降低DGD结构的面积开销。针对DGD需要为共享缓存区域创建额外的块目录项的问题,提出了创新的区域共享的双粒度目录(RSDGD)结构。该结构可用一个区域共享目录项同时维护最多3个共享者共享同一个缓存区域的一致性,从而能有效减少所需的块目录项数量,降低总的目录开销。实验结果表明,和原有的DGD相比,该结构平均减少了25%的目录空间需求,而仅产生了不到0.6%的性能损失。该结构有效地降低了芯片的面积开销,提高了目录结构的可伸缩性。
[Abstract]:The memory access behavior of multi-core processors on a dual-grained directory (DGD) and the directory overhead of DGD for different sharing behaviors are studied in order to further reduce the area overhead of DGD structure. In order to solve the problem that DGD needs to create additional block directory entries for shared cache regions, an innovative dual-grained directory (RSDGD) structure for shared regions is proposed. This structure can maintain the consistency of the same cache region shared by up to three sharers at the same time, which can effectively reduce the number of required block directory items and reduce the total directory overhead. The experimental results show that, compared with the original DGD, the structure reduces the requirement of directory space by 25% on average, and results in performance loss of less than 0.6%. This structure can effectively reduce the area overhead of the chip and improve the scalability of the directory structure.
【作者单位】：计算机体系结构国家重点实验室(中国科学院计算技术研究所);中国科学院计算技术研究所;中国科学院大学;龙芯中科技术有限公司;
【基金】：国家“核高基”科技重大专项课题(2009ZX01028-002-003,2009ZX01029-001-003,2010ZX01036-001-002,2012ZX01029-001-002-002) 国家自然科学基金(61221062,61100163,61133004,61173001,61232009,61222204) 863计划(2012AA010901,2012AA011002,2012AA012202,2013AA014301)资助项目
【分类号】：TP332

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