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                     COMPUTER SCIENCE COLLOQUIUM
 
                        WEDNESDAY FEBRUARY 19
 
                     TECHNOLOGY BUILDING ROOM 243
 
                   TIME: 2:00 (DONUTS) 2:15 (TALK)


Language Extensions for Irregular Scientific Computations

Professor Hans P. Zima

Professor of Applied Computer Science  and 
Head, Institute for Software Technology and Parallel Systems
University of Vienna, Austria

Abstract: 

High Performance Languages allow us to program scalable parallel
machines at a relatively high level of abstraction, based on the
data-parallel {\em Single-Program-Multiple-Data (SPMD)} model. Their
main features focus on the facility to express the distribution and
alignment of data across the processors of a machine.

At the beginning of this talk, we briefly outline the basic features
of such languages, essentially along the lines of High Performance
Fortran-1 (HPF-1).  In the main part of the lecture, we identify some
important properties of advanced scientific applications such as
multiblock problems, particle-in-cell codes, and sweeps over
unstructured meshes.  These applications require a language to provide
a high amount of flexibility for expressing data and work
distributions and controlling the execution of parallel loops, if the
necessary performance requirements are to be met.

We propose a set of new language extensions and discuss some aspects
of the runtime technology needed for the support of these features.
Much of this discussion will be motivated by Vienna Fortran and
research conducted in the ESPRIT project {\em HPF+}, which is
coordinated by the University of Vienna, and the new HPF-2 language
specification.

The talk concludes with an outlook to future research in languages and
compilation systems for scalable parallel machines.


Short Bio: 

Professor Hans P. Zima received his Ph.D. degree in Mathematics and
Astronomy from the University of Vienna.  After working in industry
for more than eight years, he was appointed Professor of Computer
Science at the University of Bonn, Germany, in 1975.  Since 1989, he
is a Professor of Applied Computer Science at the University of
Vienna, Austria.

He guided the development of SUPERB, the first Fortran-based
parallelization system for distributed-memory architectures, and of
Vienna Fortran, one of the predecessors of the High Performance
Fortran (HPF) language.

He is the author of several books and more than 100 publications in
the areas of programming languages and compilers for parallel systems.
His main research interests are in the field of advanced languages,
programming environments and software tools for massively parallel
machines.