Patrik,

Your question (at least from you example) is really about general parallel
computing.  Nothing you want to do with your linear model from your short
example requires some special type of parallelism.  I recommend package
'foreach' with the parallel backends, or else the package 'parallel' that
comes with the newer versions of R.  You could also have a look at Dirk's
HPC page:

http://cran.r-project.org/web/views/HighPerformanceComputing.html

Jay

-- 
John W. Emerson (Jay)
Associate Professor of Statistics, Adjunct, and Acting Director of Graduate
Studies
Department of Statistics
Yale University
http://www.stat.yale.edu/~jay

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