基于访问模式的多核末级Cache优化方法*

多核处理器架构已经成为当前处理器的主流趋势,应用程序中访问模式的多样性给多核处理器的末级Cache带来了许多挑战。提出了一种基于访问模式的多核末级Cache优化方法,它包含“可配置的共享私有Cache划分”、“可配置的旁路Cache策略”和“优先权替换策略”三个协同递进的层次。通过使用该方法,程序员能够灵活地改变末级Cache执行行为,从而高效地适应应用程序访问模式的变化。实验结果表明,提出的方法能够显著降低末级Cache的缺失率,进而提高系统的整体性能。

An optimization Method for Multi-core Last Level CacheBased on the Memory Access Modes

Multi-core architectures have been broadly utilized in current processors. Meanwhile, the diversity of memory access modes in applications brings challenges to the last level cache in multi-core processors. An optimization method for LLC based on the access modes is proposed in this paper. This method includes three coordinated and progressive levels: 1) the configurable share/private cache partition, 2) the configurable bypass cache policy, and 3) the priority replace policy. Using this method, programmers can neatly alter the behavior of the LLC to effectively adapt the variety of memory access modes in applications. Experiment results show that the proposed method can observably decrease the miss rate of the LLC and increase the system performance of the processor.