Tag Archives: MPI

Parallel streamline tracking for UnTRIM

Jacek A. Jankowski. Parallel streamline tracking for UnTRIM, 4th UnTRIM Workshop, Trento, 7-9 May 2007.

The parallel streamline tracking algorithm for the domain decomposition method applied in the MPI version of UnTRIM, is described in detail. The streamline tracking is the integral part of the semi-Lagrangian method of characteristics, being one of the most robust methods for the non-linear momentum advection, working also for larger Courant numbers. The method is however awkward to parallelise in the framework of the point-to-point communication typical for the domain decomposition method. Continue reading

UnTRIM parallelization with message passing

Jacek A. Jankowski. UnTRIM parallelization with message passing, 3rd UnTRIM Workshop, Trento, 15-17 May 2006.

This is a second part of the UnTRIM parallelisation project presentations — for the background, see the previous post. The most important issue addressed so far concerns absolving a number of stringent verification tests applied for checking the parallel implementation correctness as well as the user steering of the model. Continue reading

UnTRIM parallelization with message passing

Jacek A. Jankowski. UnTRIM parallelization with message passing, 2nd UnTRIM Workshop, Sirmione, 23-25 May 2005.

The main ideas behind the parallelisation of UnTRIM applying the domain decomposition method and the message passing (MPI) are discussed. The issues concerning the mesh partitioning, point-to-point communication over the mesh-overlapping areas (halos) for purely triangular and mixed (triangles and quadrangles) meshes and the problems connected with the Lagrangian advection scheme are thoroughly described. Continue reading

Telemac auf Origin2000 — Erste Erfahrungen

Rebekka Kopmann and Jacek A. Jankowski

Telemac auf Origin2000 — Erste Erfahrungen. Supercomputing News 1/2000 (BAW Hamburg).

The article describes the hands-on experiences by changing the principal supercomputer architecture from the vector to the parallel one, connected with the purchase of a shared-memory parallel SGI Origin 2000 machine by BAW for its Karlsruhe site. Continue reading

A threedimensional non-hydrostatic model for free surface flows – development, verification and limitations

Holger Weilbeer, Jacek A. Jankowski and Werner Zielke

Abstract. The theoretical background of a new finite-element non-hydrostatic model for simulation of free surface flows based on the fractional step method and pressure decomposition is presented. Continue reading