Fault-tolerant distributed protocols, by definition, are designed with the worst in mind. This focus on tolerating the worst often leads to expensive designs that overlook the practical observation that the occurrence of disruptions and failures is rare relative to the lifetime or mission periods of many systems. The class of optimistic fault-tolerant protocols leverages that observation and st...

Addressing deficit irrigation scheduling (DIS) for strategic crop production (especially wheat) under precipitation uncertainty is a priority for irrigation scheduling in drought conditions. This research investigated the precipitation uncertainty by enacting optimistic and pessimistic scenarios for the next 20 years by considering the statistical record of climate in Badjgah area. DIS was cond...

In this work we address state recoverability in advanced optimistic simulation systems by proposing an Evolutionary Algorithm to optimize at run-time the parameters associated with state log/restore activities. Optimization takes place by adaptively selecting for each simulation object both (i) the best suited log mode (incremental vs non-incremental) and (ii) the corresponding optimal value of...

We present an optimistic synchronous relaxation algorithm for parallel kinetic Monte Carlo (KMC) simulations of thin film growth. This algorithm is based on spatial decomposition of the KMC lattice and it employs two measures aimed at improving the parallel efficiency: dynamic global updating and domain boundary shifting. We utilize this algorithm to simulate two different growth models, which ...