Abstract. Measuring and evaluating the runtime of parallel programs is a difficult task. In this paper we present tools for performance evaluation and visualization in the distributed thread system (DTS), a programming environment for portable parallel applications. We describe the visualization of a parallel trace log as an execution graph using a novel layout algorithm which has been tailored to expose the structure of multithreaded applications.
The finite mass method is a purely Lagrangian scheme for the spatial discretisation of the macroscopic phenomenological laws that govern the flow of compressible fluids. In this article we investigate how to take into account long range gravitational forces in the framework of the finite mass method. This is achieved by incorporating an extra discrete potential energy of the gravitational field into the Lagrangian that underlies the finite mass method. The discretisation of the potential is done in an Eulerian fashion and employs an adaptive tensor product mesh fixed in space, hence the name finite mass mesh method for the new scheme. The transfer of information between the mass packets of the finite mass method and the discrete potential equation relies on numerical quadrature, for which different strategies will be proposed. The performance of the extended finite mass method for the simulation of two-dimensional gas pillars under self-gravity will be reported.
IntroductionThe finite mass method gives a discrete macroscopic description of the flow of a compressible fluid. It is a purely Lagrangian approach based on first principles of fluid mechanics. The main idea is to discretise the fluid by means of a finite number of mass packets which are called "particles". These particles have finite extension, move independently,
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.