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@Parallel Compiler Runtime Consortium Home Page
PCRC Home Page
PCRC is a DARPA sponsored
project. Its objective is to develop a public domain,
common runtime infrastructure supporting parallel compiler development
and general purpose high level SPMD programming for distributed-memory
computers. Also, to develop a Java empowered WebTop computing
mechanism for world wide collective computational solutions in science
and engineering, using the runtime infrastructure as underlying
engine.
The Consortium includes several leading
research groups working on parallel runtime systems and compilers.
Most partners brought into the project pre-existing software for
run-time management of communication and computation in data parallel
languages. Such libraries have disparate representations of
distributed data, but all provide methods for partitioning and
accessing array elements or remapping arrays. They all make some
optimizations for reducing data movement costs, such as
message-blocking, collective data movement, message coallescing,
aggregration, and so on.
In the course of the project new runtime software packages have been
developed. For example, the NPAC kernel runtime is built on some of the
technologies pioneered by the earlier packages. It is based on a
common descriptor for distributed arrays, implemented in an
object-oriented framework. The kernel library can be called from
various languages (currently Fortran, C++ and Java) through
language-specific interfaces.
A separate package developed at Maryland supports
interoperability between pre-existing libraries by allowing distributed
arrays to be transferred seamlessly from one package to another. Other
partners have developed run-time libraries for more specific problem
areas.
In the later phases of the project the workplan was strongly influenced
by the emergence of Java. Early in 1996, participants of the
project issued a draft white paper on the implications of Java for
HPCC, and subsequently organized a series of workshops on the theme of
Java for Computational Science and Engineering. This series spawned
the Java Grande Forum -- a group of academic and industrial partners
aiming to promote Java standards for communication and compute
intensive applications.
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A Final Report
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