MPI I/O Analysis and Error Detection with MARMOT

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The most frequently used part of MPI-2 is MPI I/O. Due to the complexity of parallel programming in general, and of handling parallel I/O in particular, there is a need for tools that support the application development process. There are many situations where incorrect usage of MPI by the application programmer can be automatically detected. In this paper we describe the MARMOT tool that uncovers some of these errors and we also analyze to what extent it is possible to do so for MPI I/O.