@TechReport{thakur:evaluation-tr, author = {Rajeev Thakur and William Gropp and Ewing Lusk}, title = {An Experimental Evaluation of the Parallel {I/O} Systems of the {IBM~SP} and {Intel Paragon} Using a Production Application}, year = {1996}, month = {February}, number = {MCS-P569--0296}, institution = {Argonne National Laboratory}, later = {thakur:evaluation}, keywords = {parallel I/O, multiprocessor file system, pario-bib}, abstract = {This paper presents the results of an experimental evaluation of the parallel I/O systems of the IBM SP and Intel Paragon. For the evaluation, we used a full, three-dimensional application code that is in production use for studying the nonlinear evolution of Jeans instability in self-gravitating gaseous clouds. The application performs I/O by using library routines that we developed and optimized separately for parallel I/O on the SP and Paragon. The I/O routines perform two-phase I/O and use the PIOFS file system on the SP and PFS on the Paragon. We studied the I/O performance for two different sizes of the application. We found that for the small case, I/O was faster on the SP, whereas for the large case, I/O took almost the same time on both systems. Communication required for I/O was faster on the Paragon in both cases. The highest read bandwidth obtained was 48 Mbytes/sec. and the highest write bandwidth obtained was 31.6 Mbytes/sec., both on the SP.}, comment = {This version no longer on the web.} }