PCStream: Automatic Stream Allocation Using Program Contexts


Taejin Kim and Sangwook Shane Hahn, Seoul National University; Sungjin Lee, DGIST; Jooyoung Hwang and Jongyoul Lee, Samsung Electronics; Jihong Kim, Seoul National University


We propose a fully automatic stream management technique, called PCStream, for multi-streamed SSDs. PCStream is based on our observation that data lifetimes can be reliably predicted using write program contexts. By extracting program contexts during runtime, PCStream automates the data-to-stream mapping. When data mapped to the same stream show large differences in their lifetimes, PCStream moves the long-lived data of the current stream to its substream during garbage collection. Our experimental results show that PCStream can reduce the garbage collection overhead as much as a highly-optimized manual stream management technique while no code modification is necessary.

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@inproceedings {216874,
author = {Taejin Kim and Sangwook Shane Hahn and Sungjin Lee and Jooyoung Hwang and Jongyoul Lee and Jihong Kim},
title = {{PCStream}: Automatic Stream Allocation Using Program Contexts},
booktitle = {10th USENIX Workshop on Hot Topics in Storage and File Systems (HotStorage 18)},
year = {2018},
address = {Boston, MA},
url = {https://www.usenix.org/conference/hotstorage18/presentation/kim-taejin},
publisher = {USENIX Association},
month = jul