Blogs (2) >>
ISMM 2017
Sun 18 Jun 2017 Barcelona, Spain
co-located with PLDI 2017
Sun 18 Jun 2017 17:00 - 17:30 at Aula Master - Session 4: A Deeper Look Chair(s): Steve Blackburn

Shared-memory languages and systems generally provide weak or undefined semantics for executions with data races. Prior work has proposed memory consistency models that ensure well-defined, easy-to-understand semantics based on \emph{region serializability} (RS), but the resulting system may throw a \emph{consistency exception} in the presence of a data race. Consistency exceptions can occur unexpectedly even in well-tested programs, hurting availability and thus limiting the practicality of RS-based memory models.

To our knowledge, this paper is the first to consider the problem of availability for memory consistency models that throw consistency exceptions. We first extend existing approaches that enforce \emph{RSx}, a memory model based on serializability of synchronization-free regions (SFRs), to avoid region conflicts and thus consistency exceptions. These new approaches demonstrate both the potential for and limitations of avoiding consistency exceptions under RSx. To improve availability further, we introduce (1) a new memory model called \emph{RIx} based on \emph{isolation} of SFRs and (2) a new approach called \emph{Avalon} that provides RIx. We demonstrate two variants of Avalon that offer different performance–availability tradeoffs for RIx.

An evaluation on real Java programs shows that this work’s novel approaches are able to reduce consistency exceptions, thereby improving the applicability of strong memory consistency models. Furthermore, the approaches provide compelling points in the performance–availability tradeoff space for memory consistency enforcement. RIx and Avalon thus represent a promising direction for tackling the challenge of availability under strong consistency models that throw consistency exceptions.

Sun 18 Jun

ismm-2017-papers
16:00 - 17:30: ISMM 2017 - Session 4: A Deeper Look at Aula Master
Chair(s): Steve BlackburnAustralian National University
ismm-2017-papers16:00 - 16:30
Talk
Vini KanvarIndian Institute of Technology (IIT) Bombay, Uday P. Khedker
ismm-2017-papers16:30 - 17:00
Talk
Bin FangEast China Normal University (China) and University Paris Diderot and CNRS (France), Mihaela SighireanuIRIF, University Paris Diderot and CNRS, France
ismm-2017-papers17:00 - 17:30
Talk
Minjia ZhangMicrosoft Research, Swarnendu BiswasUniversity of Texas at Austin, Michael BondOhio State University