I am using the package Multicore/Parallel to do importance sampling. I have
5 cores on my computer. And I have
let's say 10 000 particles to generate. What I did was to send 5 particles
in each time, calling the package parallel. Which means in all I am calling
the parallel command 2000 times.
What happens is in the end somewhere along the way I end up with the error
message error in fork unable to create a pipe. Would it be better for me to
call the parallel once only but each time send in 2000 particles in each
parallel process.

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