Goal is to provide model for portable file system allowing for optimization of parallel I/O
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portable I/O interface POSIX judged not possible to allow enough optimization
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Parallel I/O system provides high-level interface supporting transfers of global data structures between process memories and files.
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Significant optimizations required include:
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grouping, collective buffering, and disk-directed I/O
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Other optimizations also achieved by
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asynchronous I/O, strided accesses and control over physical file layout on disks.
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I/O access modes defined by data partitioning expressed with derived datatypes
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