Paper Details

%T occam for Multi\-Processor DEC Alphas
%A Peter H. Welch, Michael D. Poole
%E André W. P. Bakkers
%B Proceedings of WoTUG\-20: Parallel Programming and Java
%X A multi\-processor implementation of occam2.1 for
   interconnected DEC Alpha processors has been derived from
   the Kent Retargetable occam Compiler. Each Alpha processor
   is supported over a PCI bus by a T425 transputer, whose
   links complete the communications fabric. This paper reports
   on the software mechanisms for supporting these platforms
   from occam so that they appear just like any transputer
   system \-\- a collection of processing nodes connected by
   channels placed on links. Advantage was taken of a
   proprietary multi\-threading kernel, supplied as part of 3L
   Parallel C/AXP, to support parallel inter\-node
   communication. occam multi\- processing is supported by the
   KRoC kernel running within one of the 3L threads. The
   performance of generated code and networked systems has been
   benchmarked, with particular care being taken to measure the
   interaction overheads between the Alpha and its
   communication fabric. An image analysis program was also
   used in the benchmarking as an example of a real
   multi\-processor application.

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