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Conventional computers connected by high-speed communication networks present a very low cost alternative to the MPPs (Massively Parallel Processors) for applications that demand high computing power. A widespread communication system that uses the message-passing paradigm is PVM (Parallel Virtual Machine). PVM uses TCP/1P for interprocess communication. This work shows that it is possible to achieve a better performance with PVM if Fast Messages is used instead of TCP/1P. A library, called Sock2Fm, that has the semantics of sockets and uses Fast Messages in a lower levei, was developed and had its performance measured. Programmers that use the sockets API (APplication Interface) can make calls directly to the Sock2Fm functions, avoiding the use of the less known Fast Messages interface. Tests show that Sock2Fm presents a better perfomance than TCP/1P for messages bigger than 250 bytes (79% better for some packet sizes). The performance of PVM was also measured for 10 Mbps Ethernet, 100 Mbps Ethernet and Myrinet with TCP/1P. The results were analyzed and compared with the performance of Sock2Fm.

Uma Implementação de Sockets sobre Fast Messages em Redes Myrinet