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Lemon: an MPI parallel I/O library for data encapsulation using LIME

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arxiv 1106.4177 v1 pith:6RTRIWNS submitted 2011-06-21 hep-lat physics.comp-ph

classification hep-latphysics.comp-ph
keywords datalemonparallelformatapplicationbinaryencapsulationlattice
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We introduce Lemon, an MPI parallel I/O library that is intended to allow for efficient parallel I/O of both binary and metadata on massively parallel architectures. Motivated by the demands of the Lattice Quantum Chromodynamics community, the data is stored in the SciDAC Lattice QCD Interchange Message Encapsulation format. This format allows for storing large blocks of binary data and corresponding metadata in the same file. Even if designed for LQCD needs, this format might be useful for any application with this type of data profile. The design, implementation and application of Lemon are described. We conclude with presenting the excellent scaling properties of Lemon on state of the art high performance computers.

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