ExtraV: Boosting graph processing near storage with a coherent accelerator

Jinho Lee, Heesu Kim, Sungjoo Yoo, Kiyoung Choi, H. Peter Hofstee, Gi Joon Nam, Mark R. Nutter, Damir Jamsek

Research output: Contribution to journalConference articlepeer-review

45 Citations (Scopus)


In this paper, we propose ExtraV, a framework for near-storage graph processing. It is based on the novel concept of graph virtualization, which efficiently utilizes a cache-coherent hardware accelerator at the storage side to achieve performance and exibility at the same time. ExtraV consists of four main components: 1) host processor, 2) main memory, 3) AFU (Accelerator Function Unit) and 4) storage. The AFU, a hardware accelerator, sits between the host processor and storage. Using a coherent interface that allows main memory accesses, it performs graph traversal functions that are common to various algorithms while the program running on the host processor (called the host program) manages the overall execution along with more application-specific tasks. Graph virtualization is a high-level programming model of graph processing that allows designers to focus on algorithm-specific functions. Realized by the accelerator, graph virtualization gives the host programs an illusion that the graph data reside on the main memory in a layout that fits with the memory access behavior of host programs even though the graph data are actually stored in a multi-level, compressed form in storage. We prototyped ExtraV on a Power8 machine with a CAPI-enabled FPGA. Our experiments on a real system prototype offer significant speedup compared to state-of-the-art software only implementations.

Original languageEnglish
Pages (from-to)1706-1717
Number of pages12
JournalProceedings of the VLDB Endowment
Issue number12
Publication statusPublished - 2017 Aug 1
Event43rd International Conference on Very Large Data Bases, VLDB 2017 - Munich, Germany
Duration: 2017 Aug 282017 Sept 1

Bibliographical note

Publisher Copyright:
© 2017 VLDB.

All Science Journal Classification (ASJC) codes

  • Computer Science (miscellaneous)
  • General Computer Science


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