@InProceedings{bordawekar:primitives, author = {Rajesh Bordawekar and Juan Miguel {del Rosario} and Alok Choudhary}, title = {Design and Evaluation of Primitives for Parallel {I/O}}, booktitle = {Proceedings of Supercomputing '93}, year = {1993}, pages = {452--461}, publisher = {IEEE Computer Society Press}, address = {Portland, OR}, URL = {ftp://erc.cat.syr.edu/ece/choudhary/PASSION/sc93.ps.Z}, keywords = {parallel I/O, pario-bib}, abstract = {In this paper, we show that the performance of parallel file systems can vary greatly as a function of the selected data distributions, and that some data distributions can not be supported. Also, we describe how the parallel language extensions, though simplifying the programming, do not address the performance problems found in parallel file systems. \par We have devised an alternative scheme for conducting parallel I/O - the Two-Phase Access Strategy - which guarantees higher and more consistent performance over a wider spectrum of data distributions. We have designed and implemented runtime primitives that make use of the two-phase access strategy to conduct parallel I/O, and facilitate the programming of parallel I/O operations. We describe these primitives in detail and provide performance results which show that I/O access rates are improved by up to several orders of magnitude. Further, we show that the variation in performance over various data distributions is restricted to within a factor of 2 of the best access rate.}, comment = {Much of this is the same as delrosario:two-phase, except for section~4 where they describe their actual run-time library of primitives, with a little bit about how it works. It's not clear, for example, how their meta-data structures are distributed across the machine. They also do not describe their methods for the data redistribution.} }