We present an effective technique for crosschecking a C or C++ program against an accelerated OpenCL version, as well as a technique for detecting data races in OpenCL programs. Our techniques are implemented in KLEE-CL, a symbolic execution engine based on KLEE and KLEE-FP that supports symbolic reasoning on the equivalence between symbolic values. Our approach is to symbolically model the Ope...

In this work we present a new finite element code in frequency domain called ERMES. The novelty of this computational tool rest on the formulation behind it. ERMES is the C++ implementation of a simplified version of the weighted regularized Maxwell equation method. This finite element formulation has the advantage of producing well-conditioned matrices and the capacity of solving problems in t...

Ein Data-Race bezeichnet eine Situation, in der ein Thread auf ein Datum zugreift und gleichzeitig ein anderen Thread darauf schreibt.[5] In C++ ist seit dem C++11-Standard festgelegt, dass das Verhalten im Falle eines Data-Races undefiniert ist (siehe [2] §1.10/21). Weil undefinierte Zustände von kritischen Systemen in einer technikdurchdrungenen Gesellschaft wie der unseren zu beliebig großen...

Abstract. We study the decay parameter (the rate of convergence of the transition probabilities) of a birth-death process on {0, 1, . . . }, which we allow to evanesce by escape, via state 0, to an absorbing state -1. Our main results are representations for the decay parameter under four different scenarios, derived from a unified perspective involving Karlin and McGregor’s representation for ...