Abstract
The potential offered by metacomputing is hard to realize due to the complexity of programming geographically distributed applications spanning different software systems. This paper describes PARDIS, a system designed to address this challenge, based on ideas underlying the Common Object Request Broker Architecture (CORBA), a successful industry standard. PARDIS is a distributed environment in which objects representing data-parallel computations, called Single Program Multiple Data (SPMD) objects, as well as non-parallel objects present in parallel programs, can interact with each other across platforms and software systems. Each of these objects represents a small encapsulated application and can be used as a building block in the construction of powerful distributed metaapplications. The objects interact through interfaces specified in the Interface Definition Language (IDL), which allows the programmer to integrate within one metaapplication component implemented using different software systems. Further, support for non-blocking interactions between objects allows PARDIS to build concurrent distributed scenarios.
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