@TechReport{Dartmouth:TR99-351, author = {Matthew D. Pearson}, title = {{Fast Out-of-Core Sorting on Parallel Disk Systems}}, institution = {Dartmouth College, Computer Science}, address = {Hanover, NH}, number = {PCS-TR99-351}, year = {1999}, month = {June}, URL = {http://www.cs.dartmouth.edu/reports/TR99-351.ps.Z}, comment = { Undergraduate Honors Thesis. Advisor: Tom Cormen. }, abstract = { This paper discusses our implementation of Rajasekaran's (l,m)-mergesort algorithm (LMM) for sorting on parallel disks. LMM is asymptotically optimal for large problems and has the additional advantage of a low constant in its I/O complexity. Our implementation is written in C using the ViC* I/O API for parallel disk systems. We compare the performance of LMM to that of the C library function qsort on a DEC Alpha server. qsort makes a good benchmark because it is fast and performs comparatively well under demand paging. Since qsort fails when the swap disk fills up, we can only compare these algorithms on a limited range of inputs. Still, on most out-of-core problems, our implementation of LMM runs between 1.5 and 1.9 times faster than qsort, with the gap widening with increasing problem size. } }