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NV-Tree: Reducing Consistency Cost for NVM-based Single Level Systems

Authors: 

Jun Yang, Qingsong Wei, Cheng Chen, Chundong Wang, and Khai Leong Yong, Data Storage Institute, A-STAR; Bingsheng He, Nanyang Technological University

Abstract: 

The non-volatile memory (NVM) has DRAM-like performance and disk-like persistency which make it possible to replace both disk and DRAM to build single level systems. To keep data consistency in such systems is non-trivial because memory writes may be reordered by CPU and memory controller. In this paper, we study the consistency cost for an important and common data structure, B+Tree. Although the memory fence and CPU cacheline flush instructions can order memory writes to achieve data consistency, they introduce a significant overhead (more than 10X slower in performance). Based on our quantitative analysis of consistency cost, we propose NV-Tree, a consistent and cache-optimized B+Tree variant with reduced CPU cacheline flush. We implement and evaluate NV-Tree and NV-Store, a key-value store based on NV-Tree, on an NVDIMM server. NVTree outperforms the state-of-art consistent tree structures by up to 12X under write-intensive workloads. NV-Store increases the throughput by up to 4.8X under YCSB workloads compared to Redis.

Jun Yang, Data Storage Institute, A-STAR

Qingsong Wei, Data Storage Institute, A-STAR

Cheng Chen, Data Storage Institute, A-STAR

Chundong Wang, Data Storage Institute, A-STAR

Khai Leong Yong, Data Storage Institute, A-STAR

Bingsheng He, Nanyang Technological University

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BibTeX
@inproceedings {188438,
author = {Jun Yang and Qingsong Wei and Cheng Chen and Chundong Wang and Khai Leong Yong and Bingsheng He},
title = {{NV-Tree}: Reducing Consistency Cost for {NVM-based} Single Level Systems},
booktitle = {13th USENIX Conference on File and Storage Technologies (FAST 15)},
year = {2015},
isbn = {978-1-931971-201},
address = {Santa Clara, CA},
pages = {167--181},
url = {https://www.usenix.org/conference/fast15/technical-sessions/presentation/yang},
publisher = {USENIX Association},
month = feb,
}
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