一种面向编译器的数据访问节能技术研究

Research on An Energy-Saving Technology Oriented Compiler For Data Access

摘要:

当前针对磁盘功率管理的大部分研究都是把重点放在磁盘空闲周期的利用上。人们相继研究了硬件功率节约机制(比如降速磁盘和多速磁盘)和补充性的软件策略(比如改变代码和数据布局,以提高空闲周期的长度)。然而,硬件功率节约机制无法处理高能耗并行应用的短空闲周期,而代码/数据重组策略往往要求大规模的代码更改。在本文中,我们提出一种面向编译器的数据访问(I/O调用)调度技术,以节约磁盘能量,在更短的周期内聚集了尽可能多的数据请求,进而延长了磁盘空闲周期,提升硬件功率管理机制的有效性。与先前基于软件的策略相比,该技术不需重组代码或数据。在基于集群的仿真环境下结合6种应用程序对本文方法进行评估。结果表明,本文方法提升了降速磁盘和多速磁盘的性能,将功率节约平均效果提升了一倍。

Abstract:

Most existing research in disk power management has focused on exploiting idle periods of disks. Both hardware power-saving mechanisms (such as spin-down disks and multi-speed disks) and complementary software strategies (such as code and data layout transformations to increase the length of idle periods) have been explored. However, while hardware power-saving mechanisms cannot handle short idle periods of high-performance parallel applications, prior code/data reorganization strategies typically require extensive code modifications. In this paper, we propose and evaluate a compiler-directed data access (I/O call) scheduling framework for saving disk energy, which groups as many data requests as possible in a shorter period, thus creating longer disk idle periods for improving the effectiveness of hardware power saving mechanisms. As compared to prior software based efforts, it requires no code or data restructuring. We evaluate our approach using six application programs in a cluster-based simulation environment. The experimental results show that it improves the effectiveness of both spin-down disks and multispeed disks with doubled power savings on average.