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SSD Performance Modeling Using Bottleneck Analysis

Title
SSD Performance Modeling Using Bottleneck Analysis
Authors
Kim, JihunKim, JoonsungPark, PyeongsuKim, JongKim, Jangwoo
Date Issued
Jan-2018
Publisher
IEEE COMPUTER SOC
Abstract
Solid-State Drives (SSDs) are widely deployed for high throughput and low latency. However, the unpredictable access latency of SSDs makes it difficult to satisfy quality-of-service requirements and fully achieve the performance potential. In fact, it has been a fundamental challenge to accurately predict the access latency of modern SSDs performing many non-disclosed, device-specific intra-SSD optimizations. In this paper, we propose SSDcheck, a novel SSD performance model which accurately predicts the latency of future SSD accesses. After first identifying write buffer (WB) and garbage collection (GC) as the key components in modeling the access latency, we develop diagnosis snippets to identify the target SSDs critical intra-SSD parameters (e.g., WB size). Finally, we construct the SSDs access-latency model with the identified parameters. Our system-level evaluations using five commodity SSDs show that SSDcheck achieves up to 93 percent prediction accuracy. Our real-world prototype applying an SSDcheck-aware system-level request scheduling can significantly improve both throughput and tail latency by up to 2.1x and 1.46x, respectively.
URI
http://oasis.postech.ac.kr/handle/2014.oak/96090
ISSN
1556-6056
Article Type
Article
Citation
IEEE COMPUTER ARCHITECTURE LETTERS, vol. 17, no. 1, page. 80 - 83, 2018-01
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 KIM, JONG
Dept of Computer Science & Enginrg
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