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dc.titleEfficient detection of determinacy races in Cilk programs
dc.contributor.authorFeng, Mingdong
dc.contributor.authorLeiserson, Charles E.
dc.identifier.citationFeng, Mingdong,Leiserson, Charles E. (1997). Efficient detection of determinacy races in Cilk programs. Annual ACM Symposium on Parallel Algorithms and Architectures : 1-11. ScholarBank@NUS Repository.
dc.description.abstractA parallel multithreaded program that is ostensibly deterministic may nevertheless behave nondeterministically due to bugs in the code. These bugs are called determinacy races, and they result when one thread updates a location in shared memory while another thread is concurrently accessing the location. We have implemented a provably efficient determinacy-race detector for Cilk, an algorithmic multithreaded programming language. If a Cilk program run on a given input data set has a determinacy race, our debugging tool, which we call the `Nondeterminator,' guarantees to detect and localize the race. The core of the Nondeterminator is an asymptotically efficient serial algorithm (inspired by Tarjan's nearly linear-time least-common-ancestors algorithm) for detecting determinacy races in series-parallel directed acyclic graphs. For a Cilk program that runs in T time on one processor and uses ν shared-memory locations, the Nondeterminator runs in O(Tα(ν,ν)) time, where α is Tarjan's functional inverse of Ackermann's function, a very slowly growing function which, for all practical purposes, is bounded above by 4. The Nondeterminator uses at most a constant factor more space than does the original program. On a variety of Cilk program benchmarks, the Nondeterminator exhibits a slowdown of less than 12 compared with the serial execution time of the original optimized code, which we contend is an acceptable slowdown for debugging purposes.
dc.typeConference Paper
dc.description.sourcetitleAnnual ACM Symposium on Parallel Algorithms and Architectures
Appears in Collections:Staff Publications

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