Ubuntu 9.04 (2009-01-28) with the Linux 2.6.28 kernel was the fastest contender for the OpenSSL RSA 4096-bit benchmark. Ubuntu 9.04 had the greatest number of signs per second followed by Ubuntu 8.10 and then OpenSolaris 2008.11 was just behind that. The performance difference between Ubuntu 9.04 and OpenSolaris 2008.11 was just under 1.5%.
While OpenSolaris 2008.11 lagged behind Canonical's Intrepid and Jaunty releases in the benchmarks shown already, with the GraphicsMagick test the Sun operating system was absolutely slaughtered. Both versions of Ubuntu had performed many times faster than OpenSolaris with GraphicsMagick, which uses the OpenMP library for being very multi-core friendly.