λ-IO: A Unified IO Stack across the Host and Computational Storage Device

Authors: 

Zhe Yang, Youyou Lu, Xiaojian Liao, Youmin Chen, Junru Li, Siyu He, and Jiwu Shu, Tsinghua University

Abstract: 

The emerging computational storage device offers an opportunity for in-storage computing. It alleviates the overhead of data movement between the host and the device, and thus accelerates data-intensive applications. In this paper, we present λ-IO, a unified IO stack managing both computation and storage resources across the host and the device. We propose a set of designs – interface, runtime, and scheduling – to tackle three critical issues. We implement λ-IO in full-stack software and hardware environment, and evaluate it with synthetic and production applications against Linux IO, showing up to 5.12× performance improvement.