Bandwidth-aware memory system for fairness on performance requirement in multicore systems

Abstract

In a multicore system, shared resources cause interference between threads and DRAM system is one of the major resource that make interference. Some previous works have studied on memory interference to achieve a level of fairness on memory system. Stall-time fair memory system (STFM), one of the works, has reduced memory interference by control memory slowdown. However, STFM didn`t focused on fairness on performance which is more direct metric for user of the system. Therefore, bandwidth-aware memory system (BAMS) are designed and implemented to satisfy new fairness requirement on performance in multicore systems introduced in this paper. BAMS changes both memory bandwidth partitioning and memory request scheduling so that the system produces performance required for the performance requirement. BAMS satisfies the fairness requirement of all workloads at level of 95% of baseline performance except only one thread which achieves 90% of baseline performance.