标题：Checkpoint Aware Hybrid Cache Architecture for NV Processor in Energy Harvesting Powered Systems
作者：Xie, Mimi; Zhao, Mengying; Pan, Chen; Li, Hehe; Liu, Yongpan; Zhang, Youtao; Xue, Chun Jason; Hui, Jingtong
作者机构：[Xie, Mimi; Pan, Chen; Hui, Jingtong] Oklahoma State Univ, Sch Elect & Comp Engn, Stillwater, OK 74078 USA.; [Zhao, Mengying] Shandong Univ, Sch Com 更多
会议名称：International Conference on Hardware/Software Codesign and System Synthesis (CODES+ISSS)
会议日期：OCT 02-07, 2016
来源：2016 INTERNATIONAL CONFERENCE ON HARDWARE/SOFTWARE CODESIGN AND SYSTEM SYNTHESIS (CODES+ISSS)
关键词：Non-volatile processor; Hybrid cache; Checkpointing; IoT; Energy; harvesting
摘要：Energy harvesting is one of the most promising battery alternatives to power future generation embedded systems in Internet of Things (IoT). However, energy harvesting powered embedded systems suffer from frequent execution interruption due to unstable energy supply. To bridge intermittent program execution across different power cycles, non-volatile processor (NVP) was proposed to checkpoint register contents during power failure. Together with register contents, the cache contents also need to be preserved during power failure. While pure non-volatile memory (NVM) based cache is an intuitive option, it suffers from inferior performance due to high write latency and energy overhead. In this paper, we will propose replacement and checkpoint policies for SRAM and NVM based hybrid cache in NVPs whose execution is interrupted frequently. Checkpointing aware cache replacement polices and smart checkpointing polices are proposed to achieve satisfactory performance and efficient checkpointing upon a power failure and fast resumption when power returns. The experimental results show that the proposed architectures and polices outperform existing cache architectures for NVPs.