%T Cluster Computing and JCSP Networking
%A Peter H. Welch, Brian Vinter
%E James S. Pascoe, Roger J. Loader, Vaidy S. Sunderam
%B Communicating Process Architectures 2002
%X Hoare\[rs]s algebra of Communicating Sequential Processes
(CSP) enables a view of systems as layered networks of
concurrent components, generating and responding to events
communicated to each other through channels, barriers and
other (formally defined) synchronisation primitives. The
resulting image and discipline is close to hardware design
and correspondingly easy to visualise, reason about, compose
and scale. JCSP is a library of Java packages providing an
(occam) extended version of this model that may be used
alongside, or as a replacement for, the very different
threads\-and\-monitors concurrency mechanisms built into
Java. The current release (JCSP 1.0) supports concurrency
within a single Java Virtual Machine (which may be
multi\-processor). This paper reports early experiments with
JCSP.net, an extension of JCSP for the dynamic construction
of CSP networks across distributed environments. The aims of
JCSP.net are to simplify the construction and programming of
dynamically distributed and parallel systems. It provides
high\-level support for CSP architectures, unifying
concurrency logic within and between processors. The
experiments are on some classical HPC problems, an area of
work for which JCSP.net was not primarily designed. However,
low overheads in the supporting infrastructure were a
primary consideration * along with an intuitive and
high\-level distributed programming model (based on CSP).
Results reported show JCSP holding up well against * and
often exceeding * the performance obtained from existing
tools such as mpiJava and IBM*s TSpaces. The experimental
platform was a cluster of 16 dual\-processor PIII Linux
machines. It is expected that future optimisations in the
pipeline for the JCSP.net infrastructure will improve the
results presented here. JCSP and JCSP.net were developed at
the University of Kent.
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