Verimag

Technical Reports

Pranav Tendulkar, Peter Poplavko, Oded Maler
Symmetry Breaking for Multi-Criteria Mapping and Scheduling on Multicores (2013)

TR-2013-3.pdf


Keywords: synchronous data-flow, multiprocessor, multicore, mapping, scheduling, SMT, SAT solver

Abstract: Multiprocessor mapping and scheduling is a long-old difficult problem. In this work we propose a new methodology to perform mapping and scheduling along with buffer memory optimization using an SMT solver. We target split-join graphs, a formalism inspired by synchronous data-flow (SDF) which provides a compact symbolic representation of data-parallelism. Unlike the traditional design flow for SDF which involves splitting of a big problem into smaller heuristic sub-problems, we deal with this problem as a whole and try to compute exact Pareto-optimal solutions for it. We introduce symmetry breaking constraints in order to reduce the run-times of the solver. We have tested our work on a number of SDF graphs and demonstrated the practicality of our method. We validate our models by running an image decoding application on the Tilera multicore platform.

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