Dear All, I found Andy Liaw's suggestion about using a NUMA (instead of SMP) kernel when running R on amd64 with > 1 CPU http://finzi.psych.upenn.edu/R/Rhelp02a/archive/35109.html A couple of questions: 1. Is this still the case with the newer dual-core opterons (e.g., the 275 et al., families) running Linux (kernel 2.6)? 2. How does this affect using Rmpi (and snow, papply, et al.) on multi-server clusters with > 1 CPU? If I understand correctly, and if the situation is what Andy described, if we use a SMP kernel we will suffer a within-node penalty in one of the Rmpi processes. Is this correct? Thanks, R.
Ram??n D??az-Uriarte Bioinformatics Unit Centro Nacional de Investigaciones Oncol??gicas (CNIO) (Spanish National Cancer Center) Melchor Fern??ndez Almagro, 3 28029 Madrid (Spain) Fax: +-34-91-224-6972 Phone: +-34-91-224-6900 http://ligarto.org/rdiaz PGP KeyID: 0xE89B3462 (http://ligarto.org/rdiaz/0xE89B3462.asc) **NOTA DE CONFIDENCIALIDAD** Este correo electr??nico, y en s...{{dropped}}