Efficient Explicit -State Model Checking for Programs With Dynamically Allocated Data

121 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2007.We implemented Delta Execution in two model checkers, JPF (Java PathFinder) and BOX (Bounded Object eXploration) to evaluate the effectiveness of this technique in model checkers with different designs. The results show that DeltaExecution improves the overall exploration in both tools, but the improvements are due to different factors. We evaluate DeltaExecution on ten simple subject programs and a larger case study. The results show that DeltaExecution improves the exploration time for the smaller programs from 0.88x to 126.80x (with median 5.60x) in JPF and from 0.58x to 4.16x (with median 2.23x) in BOX, while taking from 0.46x to 11.50x (with median 1.48x) less memory in JPF and from 0.18x to 2.71x (with median 1.18x) memory in BOX. The experimental results on one larger case study show that DeltaExecution improves the exploration time from 0.88x to 2.04x (with median 1.72x). Note that a ratio smaller than 1 means a slow down or use of more memory. Such ratios can arise in the exploration of small state-spaces.U of I OnlyRestricted to the U of I community idenfinitely during batch ingest of legacy ETD