Sets up parallel processing using the snowfall package
setup(cpus = NULL, logical = FALSE, ...)the number of CPUs to use for parallel processing. If left empty
all physical cores will be used, unless logical=TRUE, in which case both
physical and logical (virtual) cores will be used.
Use the logical cores as well? Using the virtual cores may
not lead to any significant decrease in run time.
You can test the optimal number of cores using optCPU()
other arguments passed to 'snowfall::sfInit'
if (FALSE) {
setup() # set-up the physical processors
setup(6) # set-up 6 processors
setup(logical=TRUE) # set-up physical and logical cores
}