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SCHEDULE: NOV 15-20, 2015

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CilkSpec: Optimistic Concurrency for Cilk

SESSION: Programming Systems


EVENT TAG(S): Programming Systems

TIME: 4:30PM - 5:00PM


AUTHOR(S):Shaizeen Aga, Sriram Krishnamoorthy, Satish Narayanasamy



Recursive parallel programming models such as Cilk strive to simplify the task of parallel programming by enabling a simple divide-and-conquer model of programming. This model is effective in recursively partitioning work into smaller parts and combining their results. However, recursive work partitioning can impose additional constraints on concurrency than is implied by the true dependencies in a program. In this paper, we present a speculation-based approach to alleviate the concurrency constraints imposed by such recursive parallel programs. We design a runtime infrastructure that supports speculative execution and a predictor to accurately learn and identify opportunities to relax extraneous concurrency constraints. Experimental evaluation demonstrates that speculative relaxation of concurrency constraints can deliver gains of up to 1.6 times on 30 cores over baseline Cilk.

Chair/Author Details:

Dries Kimpe (Chair) - KCG Holdings, Inc.|

Shaizeen Aga - University of Michigan, Ann Arbor

Sriram Krishnamoorthy - Pacific Northwest National Laboratory

Satish Narayanasamy - University of Michigan, Ann Arbor

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Paper provided by the ACM Digital Library

Paper also available from IEEE Computer Society