Whole-system Persistence with Non-volatile Memories

Today’s databases and key-value stores commonly keep all their data in main memory. A single server can have over 100 GB of memory, and a cluster of such servers can have 10s to 100s of TB. However, a storage back end is still required for recovery from failures. Recovery can last for minutes for a single server or hours for a whole cluster, causing heavy load on the back end. Nonvolatile main memory (NVRAM) technologies can help by allowing near-instantaneous recovery of in-memory state. However, today’s software does not support this well. Block-based approaches such as persistent buffer caches suffer from data duplication and block transfer overheads. Recently, user-level persistent heaps have been shown to have much better performance than these. However they require substantial application modification and still have significant runtime overheads.

This paper proposes whole-system persistence (WSP) as an alternative. WSP is aimed at systems where all memory is nonvolatile. It transparently recovers an application’s entire state, making a failure appear as a suspend/resume event. Runtime overheads are eliminated by using “flush on fail”: transient state in processor registers and caches is flushed to NVRAM only on failure, using the residual energy from the system power supply. Our evaluation shows that this approach has 1.6–13 times better runtime performance than a persistent heap, and that flush-on-fail can complete safely within 2–35% of the residual energy window provided by standard power supplies.

paper-updated.pdf
PDF file

In  Seventeenth International Conference on Architectural Support for Programming Languages and Operating Systems (ASPLOS 2012)

Publisher  ACM
Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. To copy otherwise, to republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. ASPLOS’12, March 3–7, 2012, London, England, UK. Copyright c 2012 ACM 978-1-4503-0759-8/12/03. . . $10.00

Details

TypeInproceedings
> Publications > Whole-system Persistence with Non-volatile Memories