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Twizzler: A Data-centric OS for Non-volatile Memory

Published: 08 June 2021 Publication History

Abstract

Byte-addressable, non-volatile memory (NVM) presents an opportunity to rethink the entire system stack. We present Twizzler, an operating system redesign for this near-future. Twizzler removes the kernel from the I/O path, provides programs with memory-style access to persistent data using small (64 bit), object-relative cross-object pointers, and enables simple and efficient long-term sharing of data both between applications and between runs of an application. Twizzler provides a clean-slate programming model for persistent data, realizing the vision of Unix in a world of persistent RAM.
We show that Twizzler is simpler, more extensible, and more secure than existing I/O models and implementations by building software for Twizzler and evaluating it on NVM DIMMs. Most persistent pointer operations in Twizzler impose less than 0.5 ns added latency. Twizzler operations are up to faster than Unix, and SQLite queries are up to faster than on PMDK. YCSB workloads ran 1.1– faster on Twizzler than on native and NVM-optimized SQLite backends.

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cover image ACM Transactions on Storage
ACM Transactions on Storage  Volume 17, Issue 2
May 2021
202 pages
ISSN:1553-3077
EISSN:1553-3093
DOI:10.1145/3465461
  • Editor:
  • Sam H. Noh
Issue’s Table of Contents
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Publication History

Published: 08 June 2021
Accepted: 01 March 2021
Revised: 01 March 2021
Received: 01 November 2020
Published in TOS Volume 17, Issue 2

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Author Tags

  1. Persistent memory
  2. non-volatile memory
  3. NVM
  4. PMEM
  5. single-level store
  6. global address space
  7. memory hierarchy

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  • National Science Foundation
  • Intel Corporation
  • UCSC Center for Research in Storage Systems

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