Write-Light Cache for Energy Harvesting Systems
| dc.contributor.author | Choi, Jongouk | en |
| dc.contributor.author | Zeng, Jianping | en |
| dc.contributor.author | Lee, Dongyoon | en |
| dc.contributor.author | Min, Changwoo | en |
| dc.contributor.author | Jung, Changhee | en |
| dc.date.accessioned | 2023-07-11T13:47:28Z | en |
| dc.date.available | 2023-07-11T13:47:28Z | en |
| dc.date.issued | 2023-06-17 | en |
| dc.date.updated | 2023-07-01T08:02:55Z | en |
| dc.description.abstract | Energy harvesting system has huge potential to enable battery-less Internet of Things (IoT) services. However, it has been designed without a cache due to the difficulty of crash consistency guarantee, limiting its performance. This paper introduces Write-Light Cache (WL-Cache), a specialized cache architecture with a new write policy for energy harvesting systems. WL-Cache combines benefits of a write-back cache and a write-through cache while avoiding their downsides. Unlike a write-through cache, WL-Cache does not access a non-volatile main memory (NVM) at every store but it holds dirty cache lines in a cache to exploit locality, saving energy and improving performance. Unlike a write-back cache, WL-Cache limits the number of dirty lines in a cache. When power is about to be cut off, WL-Cache flushes the bounded set of dirty lines to NVM in a failure-atomic manner by leveraging a just-in-time (JIT) checkpointing mechanism to achieve crash consistency across power failure. For optimization, WL-Cache interacts with a run-time system that estimates the quality of energy source during each power-on period, and adaptively reconfigures the possible number of dirty cache lines at boot time. Our experiments demonstrate that WL-Cache reduces hardware complexity and provides a significant speedup over the state-of-the-art volatile cache design with non-volatile backup. For two representative power outage traces, WL-Cache achieves 1.35x and 1.44x average speedups, respectively, across 23 benchmarks used in prior work. | en |
| dc.description.version | Published version | en |
| dc.format.mimetype | application/pdf | en |
| dc.identifier.doi | https://doi.org/10.1145/3579371.3589098 | en |
| dc.identifier.uri | http://hdl.handle.net/10919/115730 | en |
| dc.language.iso | en | en |
| dc.publisher | ACM | en |
| dc.rights | Creative Commons Attribution 4.0 International | en |
| dc.rights.holder | The author(s) | en |
| dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | en |
| dc.title | Write-Light Cache for Energy Harvesting Systems | en |
| dc.type | Article - Refereed | en |
| dc.type.dcmitype | Text | en |