The same story goes for MG.B as the other NAS Parallel tests with it being the best in CentOS 5.4 and running slightly behind in the other operating systems.
The CompileBench results are rather interesting with it showing CentOS 5.4 performing the best. This is largely due to a difference between the EXT3 and EXT4 file-systems, but Ubuntu 10.04 LTS managed to pull in right behind CentOS 5.4, which is worth further investigation for those looking to tune their performance in this area.
EXT4 actually does dramatically faster than EXT3 with the PostMark benchmark, where the three other test candidates were all at least twice as fast as CentOS 5.4. The best overall performer in this benchmark was Ubuntu 10.04 LTS. The beta release of Red Hat Enterprise Linux 6.0 though performed admirably and was slightly faster than Fedora 12.