In this paper, we present an asynchronous parallel quasi-Newton method
. We assume that we have p + q processors, which are divided into two
groups, the two groups execute in an asynchronous parallel fashion. If
we assume that the objective function is mice continuously differenti
able and uniformly convex, we discuss the global and superlinear conve
rgence of the parallel BFGS method. Finally we show numerical results
of this algorithm.