[R] R, AMD Opteron 64, and Rmpi
Ramon Diaz-Uriarte
rdiaz at cnio.es
Tue Feb 14 15:38:00 CET 2006
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.
--
Ramón Díaz-Uriarte
Bioinformatics Unit
Centro Nacional de Investigaciones Oncológicas (CNIO)
(Spanish National Cancer Center)
Melchor Fernández 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)
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