面向访问模式的多核末级 Cache 优化方法

摘要

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 the last level Cache based on the access modes is proposed.This method includes three coordinated and progressive levels:the configurable share /private Cache partition,the configurable bypass Cache policy,and the priority replace policy.Using this method,programmers can neatly alter the behavior of the last level Cache 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 last level Cache and increase the system performance of the processor.%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。