Distributing Numerical Algorithms: Some Experiences with Network Computing System (NCS) and Parallel Virtual Machine (PVM) M. Alfano Dipartimento di Ingegneria Elettrica Universita’ degli Studi Viale delle Scienze - 90128 PALERMO marco@ipacuc.cuc.unipa.it G. Lo Re Centro Universitario di Calcolo Universita’ degli Studi Viale delle Scienze - 90128 PALERMO lore@ipacuc.cuc.unipa.it Abstract Nowadays distributed systems have become effective and widely us Consequently several methods and tecniques for distributed applica have been developed. The Remote Procedure Calls (RPC) allow users distribute and execute pieces of a program on different computers. Network Computing System (NCS) is a development environment based RPCs for distributed software acting as a high-level tool for the manage of the RPCs. The Parallel Virtual Machine (PVM) uses only message pass primitives to allow the interprocess communication and consequently distribute tasks among different machines. Using these software system present some experiences made to distribute numerical algorithms and consequent implementation methods.