I/O included in MPI-2

• Goal is to provide model for portable file system allowing for optimization of parallel I/O

  • portable I/O interface POSIX judged not possible to allow enough optimization

• Parallel I/O system provides high-level interface supporting transfers of global data structures between process memories and files.

• Significant optimizations required include:

  • grouping, collective buffering, and disk-directed I/O

• Other optimizations also achieved by

  • asynchronous I/O, strided accesses and control over physical file layout on disks.

• I/O access modes defined by data partitioning expressed with derived datatypes

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