David I. August
Professor in the Department of Computer Science, Princeton University
Affiliated with the Department of Electrical Engineering, Princeton University
Ph.D. May 2000, Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign

Office: Computer Science Building Room 221
Email: august@princeton.edu
Phone: (609) 258-2085
Fax: (609) 964-1699
Administrative Assistant: Pamela DelOrefice, (609) 258-5551

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Parallel Assertions for Debugging Parallel Programs [abstract] (IEEE Xplore, PDF)
Daniel Schwartz-Narbonne, Feng Liu, Tarun Pondicherry, David I. August, and Sharad Malik
2011 9th IEEE/ACM International Conference on Formal Methods and Models for Codesign (MEMOCODE), July 2011.
Accept Rate: 35% (16/45).

A parallel program must execute correctly even in the presence of unpredictable thread interleavings. This interleaving makes it hard to write correct parallel programs, and also makes it hard to find bugs in incorrect parallel programs. A range of tools have been developed to help debug parallel programs, ranging from atomicity-violation and data-race detectors to model-checkers and theorem provers. One technique that has been successful for debugging sequential programs, but less effective for parallel programs, is running the program using assertion predicates provided by the developer. These assertions allow programmers to specify and check their assumptions. In a multi-threaded program, the programmer's assumptions include both the current state, and any actions (e.g. access to shared memory) that other, parallel executing threads might take. We introduce parallel assertions which allow programmers to express these assumptions for parallel programs using simple and intuitive syntax and semantics. We present a proof-of-concept implementation, and demonstrate its value by testing a number of benchmark programs using parallel assertions.