The grid usage is facing the problem that consists in running existing sequential code for parallel execution transparently (ie. using source code without modification). AIPE is a middleware that deals with this problem. MPIPP is the software component we have developed to allow the generation of MPI derived datatypes from C datatype definitions automatically. The goal of this new tool is to make the building of complex messages easier for the end-user. Moreover, this paper shows that MPIPP goes farther in the complexity level of C datatypes that can be taken into account than any other similar tools have ever gone to.
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