@TechReport{delrosario:two-phase-tr, author = {Juan Miguel del Rosario and Rajesh Bordawekar and Alok Choudhary}, title = {Improving Parallel {I/O} Performance using a Two-Phase Access Strategy}, year = {1993}, number = {SCCS--406}, institution = {NPAC at Syracuse University}, later = {delrosario:two-phase}, keywords = {parallel I/O, multiprocessor file system, pario-bib}, comment = {They show performance measurements of various data distributions on an nCUBE and the Touchstone Delta, for reading matrix from a column-major file striped across disks, into some distribution across procs. Distributions that don't match the I/O distribution are really terrible, due to having more, smaller requests, and sometimes mismatching the stripe size (getting seg-like contention) or block size (reading partial blocks). They find it is better to read the file using the `best' distribution, then to reshuffle the data in memory. Big speedups.} }