FRINK Linked Data Fragments server

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• W3196247263 abstract "Non-volatile memory, including phase-change memory (PCM), has several benefits including low cost, non-volatility, byte-addressability, etc., and limitations such as write endurance. There have been several hardware approaches to exploit the benefits while minimizing the negative impact of limitations. Software approaches could give further improvements, when used together with hardware approaches, by taking advantage of write behavior present in the program, e.g., write behavior on dynamically allocated data, which is hardly captured by hardware approaches. This work proposes a software design methodology to reduce costly PCM writes. First, on top of existing hardware approach such as Flip-N-Write, this work advocates exploiting the capability of PCM bit-level differential write in the software by judiciously reusing previously allocated memory resource. In order to avoid wear-out incurred by the reuse, this work presents software-based wear-leveling methods which distribute writes across PCM cells. In order to further reduce PCM writes, we propose identifying data whose loss does not affect the functionality of the underlying software, and then diverting write traffic for those data items to volatile memory. To evaluate the effectiveness of these methods, as a case study, we applied the proposed methods to the design of journaling in SQLite and Memcached. SQLite is an important database application commonly used in smartphones, and Memcached is a distributed key-value cache system widely used in server application to accelerate service time. For the experiments, we used an in-house PCM-based prototype board and PC. Experiments about SQLite with four representative mobile applications show that the proposed design methods, which is applied on top of the hardware approach, Flip-N-Write, result in 75.2% further reduction in total bit updates in PCM, on average, without aggravating wear out compared with the baseline of PCM-based journaling which is based only on the hardware approach. Also, the proposed design methods result in 58.3% reduction in energy consumption and 31.7% reduction in runtime compared to the baseline design of SQLite journaling on Flash memory. Experiments about Memcached with memtier and YCSB shows proposed design methods gives 14.5% processing time reduction compared to same-cost original Memcached implementation and 67.0% total bit update reduction compared to Memcached implementation that uses PCM only to store key-value items." @default.
• W3196247263 created "2021-08-30" @default.
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• W3196247263 date "2016-01-01" @default.
• W3196247263 modified "2023-09-24" @default.
• W3196247263 title "Software Design for Non-volatile Memory" @default.
• W3196247263 hasPublicationYear "2016" @default.
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