关键词: 硬实时多核系统, 最差情况下的能量消耗（WCEC）, 指令预取, 缓存划分

Abstract: For the?hard real-time multicore system?that its energy supply is limited, the cache WCEC（Worst-Case Energy Consumption） is a very critical problem. With the development of chip technology, sequential instructions prefetching can reduce the cache WCEC. In order to improve the worst case energy saving efficiency of instruction prefetching, the cache WCEC optimization method combined with the instruction prefetching and shared cache partitioning?is proposed. The method assigns??L2 cache partitioning factor??for each core and adjusts instruction prefetching degree for?each subtask by ILP（Integer-Linear Programing）, to minimize the cache WCEC of hard real-time multicore system when guarantees the system meets the time deadline. The DEBIE system is analyzed in the experiments, and the results show that optimization method? is effective，the optimized cache WCEC is decreased by?22.5% on an average than that of without instruction prefetching optimization when?guarantees DEBIE system meet its?time?deadline.

Key words: hard real-time multicore system, Worst-Case Energy Consumption（WCEC）, instruction prefetching, cache partitioning