Evaluation of the Performance Impact of SPM Allocation on a Novel Scratchpad Memory

Local Memory Store (LMStore) is a novel scratchpad memory (SPM) design, with recent research evaluation showing its capability for improving program performance. However, the performance of LMStore depends on its memory layout decided by its allocation scheme. In this paper, we evaluate the impact of SPM allocation on LMStore performance. Our experimental results, using benchmarks from the Malardalen WCET benchmark suite executing on LMStore architecture modeled in the PyCacheSim simulator, demonstrate that LMStore with a stack distance-based SPM allocation scheme significantly improves data movement by an average of 44.46% compared to a Cache-only architecture, and by an average of 23.89% compared to LMStore with a frequency-based SPM allocation scheme.