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Parallel netCDF (PnetCDF) is a popular library used in many scientific applications to store scientific datasets. It provides high-performance parallel I/O while maintaining file-format compatibility with Unidata's netCDF. Array variables comprise the bulk of the data in a netCDF dataset, and for accesses to large regions of single array variables, PnetCDF attains very high performance. However, the current PnetCDF interface only allows access to one array variable per call. If an application instead accesses a large number of small-sized array variables, this interface limitation can cause significant performance degradation, because high end network and storage systems deliver much higher performance with larger request sizes.
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