Efficient Race Detection with Futures
This paper addresses the problem of provably efficient and practically good on-the-fly determinacy race detection in task parallel programs that use futures. Prior works on determinacy race detection have mostly focused on either task parallel programs that follow a series-parallel dependence structure or ones with unrestricted use of futures that generate arbitrary dependences. In this work, we consider a restricted use of futures and show that we can detect races more efficiently than with general use of futures.
Specifically, we present two algorithms: \MultiBags and \MultiBagsPlus. \MultiBags targets programs that use futures in a restricted fashion and runs in time $O(T_1 \alpha(m,n))$, where $T_1$ is the sequential running time of the program, $\alpha$ is the inverse Ackermann’s function, $m$ is the total number of memory accesses, $n$ is the dynamic count of places at which parallelism is created. Since $\alpha$ is a very slowly growing function (upper bounded by $4$ for all practical purposes), it can be treated as a close-to-constant overhead. \MultiBagsPlus is an extension of \MultiBags that target programs with general use of futures. It runs in time $O((T_1+k^2)\alpha(m,n))$ where $T_1$, $\alpha$, $m$ and $n$ are defined as before, and $k$ is the number of future operations in the computation. We implemented both algorithms and empirically demonstrate their efficiency.
Wed 20 FebDisplayed time zone: Guadalajara, Mexico City, Monterrey change
09:35 - 10:50
Session 9: SynchronizationMain Conference at Salon 12/13
Chair(s): Erez Petrank Technion
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Martin Bättig Department of Computer Science, ETH Zurich, Thomas Gross ETH ZurichDOI
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Herbert Jordan University of Innsbruck, Pavle Subotic University College London, David Zhao The University of Sydney, Bernhard Scholz University of Sydney, AustraliaDOI
|Efficient Race Detection with Futures|
Robert Utterback Monmouth College, Kunal Agrawal Washington University in St. Louis, Jeremy Fineman , I-Ting Angelina Lee Washington University in St. LouisDOI