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Line 152: {{Expand section\|date=June 2008}} The parallel I/O feature is sometimes called MPI-IO,<ref name="Gropp99adv-pp5-6">{{harvnb \|Gropp \|Lusk \|Skjelling \|~~1999b~~1999 \|pp=5–6 }}</ref> and refers to a set of functions designed to abstract I/O management on distributed systems to MPI, and allow files to be easily accessed in a patterned way using the existing derived datatype functionality. The little research that has been done on this feature indicates that it may not be trivial to get high performance gains by using MPI-IO. For example, an implementation of sparse [[Matrix multiplication\|matrix-vector multiplications]] using the MPI I/O library shows a general behavior of minor performance gain, but these results are inconclusive.<ref>{{cite web\|url=http://marcovan.hulten.org/report.pdf\|title=Sparse matrix-vector multiplications using the MPI I/O library}}</ref> It was not

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