基于海思平台的AHD系统内存优化方案

The software system of AHD based on Hisilicon platform

基于海思平台的AHD系统可以进行多模式切换,实现了DVR/NVR/HVR功能3合1。然而,由于DVR模式、NVR模式、HVR模式实现方式的各不相同,其对OS(操作系统)内存与MMZ(多媒体处理)内存的需求不尽相同。导致原本能够满足单独模式运行的固定的内存分配方式无法满足不同模式的性能需求。基于此,文中论述了一种全新的动态内存分配方案,以保证AHD系统在不同工作模式下,能够在有限的DDR容量限制下,使AHD系统性能得到充分发挥。

Due to the A H D system which has multi-mode switching,that make it can realize D V R / N V R /H V R function three in one. However,different modes have different requirements of OS memory andM M Z memory. That makes another problem, the limited memory cannot meet the performancerequirement of different models. Base on this, in order to guarantee the A H D system under differentoperation m o des, it can make full use of the limited capacity of D D R , to make the system into full play,this paper presents a new method of allocting memory dynamically.