HOOP: Efficient Hardware-Assisted Out-of-Place Update for Non-Volatile Memory

Miao Cai, Chance C. Coats, Jian Huang

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Byte-addressable non-volatile memory (NVM) is a promising technology that provides near-DRAM performance with scalable memory capacity. However, it requires atomic data durability to ensure memory persistency. Therefore, many techniques, including logging and shadow paging, have been proposed. However, most of them either introduce extra write traffic to NVM or suffer from significant performance overhead on the critical path of program execution, or even both. In this paper, we propose a transparent and efficient hardware-assisted out-of-place update (HOOP) mechanism that supports atomic data durability, without incurring much extra writes and performance overhead. The key idea is to write the updated data to a new place in NVM, while retaining the old data until the updated data becomes durable. To support this, we develop a lightweight indirection layer in the memory controller to enable efficient address translation and adaptive garbage collection for NVM. We evaluate HOOP with a variety of popular data structures and data-intensive applications, including key-value stores and databases. Our evaluation shows that HOOP achieves low critical-path 1atency with small write amplification, which is close to that of a native system without persistence support. Compared with state-of-the-art crash-consistency techniques, it improves application performance by up to 1.7×, while reducing the write amplification by up to 2.1×. HOOP also demonstrates scalable data recovery capability on multi-core systems.

Original languageEnglish (US)
Title of host publicationProceedings - 2020 ACM/IEEE 47th Annual International Symposium on Computer Architecture, ISCA 2020
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages13
ISBN (Electronic)9781728146614
StatePublished - May 2020
Event47th ACM/IEEE Annual International Symposium on Computer Architecture, ISCA 2020 - Virtual, Online, Spain
Duration: May 30 2020Jun 3 2020

Publication series

NameProceedings - International Symposium on Computer Architecture
ISSN (Print)1063-6897


Conference47th ACM/IEEE Annual International Symposium on Computer Architecture, ISCA 2020
CityVirtual, Online


  • logging
  • memory persistency
  • Non-volatile memory
  • out-of-place update

ASJC Scopus subject areas

  • Hardware and Architecture

Fingerprint Dive into the research topics of 'HOOP: Efficient Hardware-Assisted Out-of-Place Update for Non-Volatile Memory'. Together they form a unique fingerprint.

Cite this