Modern technologies including rapid increase in speed and availability of network of supercomputer provides the infrastructure necessary to develop distributed applications and making high performance global computing possible. The performance potetial offered is enormous but gener-ally is hard and tedious to obtain due to the complexity of developing applications in such distributed environment. To cure this problem, we introduce MeDLey which is a speci-fication language of communications for parallel applica-tions. In this paper, we will first overview the basics of the MeDLey syntax and semantics, before talking about the ex-tension part of this lanuage for the collective communica-tions.
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