多核片上系统全局主动访存优化研究

Global proactive memory scheduling on multi-processor system-on-chip

本文提出了一种多核片上系统(MPSoC)全局主动访存调度优化方法(GPMS)来提升系统的访存性能。该方法利用IP(intellectual property)核的访存局部性和延迟容忍度,通过限制访存冲突的IP核使其在一个调度窗口内分别连续访问内存,从而减少访存冲突次数,同时不存在访存冲突的IP核在调度窗口内一直保持内存的使用权,从而可以充分发挥内存控制器端访存队列调度的自由度和DRAM的bank级并行性。实验结果表明,当IP核间访存冲突严重时,该方法相比访存队列调度方式可以提升1到2倍的访存带宽。

A global proactive memory scheduling method is proposed for multi-processor system-on-chip (MPSoC) to improve memory performance. This method uses the memory access locality and delay tolerance of IP (intellectual property) cores. By restricting the conflicting IP cores, they continuously access the memory within a scheduling window, thereby reducing the number of memory conflicts. At the same time, IP cores that do not have memory access conflicts maintain the memory usage rights within the scheduling window. In this way, the freedom of memory scheduling queue on memory controller side and bank-level parallelism of DRAM can be fully utilized. The experiment results show that when the IP core memory access conflict is serious, the method can increase the memory bandwidth by 1 to 2 times compared with the memory scheduling queue method.