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SLIME 2.0: A Free World Class High Performance SAT Solver

SAT Race 2015

v1.0 PAR-2 605079.2646

v2.0 PAR-2 591812.0663

(The solvers will ranked using the PAR-2 scheme: The score of a solver is defined as the sum of all runtimes for solved instances + 2*timeout for unsolved instances, lowest score wins.)
SAT Race 2006 SAT Race 2015 SAT Race 2006

SLIME: A Minimal Heuristic to Boost SAT Solving

On CDCL Based SAT Solvers the trail size is strictly related to progress or to the total conflicts on the current assignment, such that if the trail size is the same that the number of variables, then current assignment is valid. On the other hand, in the selection of the current variable it is necessary to assign a predetermined polarity to the resulting literal, which in most implementations is a predefined value. SLIME implement a simple heuristic with minimal complexity, that correlated the trail size and the polarity of the current variable to assign. The selection of variable is not related to trail size, this decouple the both concepts.