snow makeCluster (makeSOCKcluster) not working in R-2.11

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Interesting: I run into the same problem (also R-2.11) when using
Windows inside VirtualBox from a Debian host (i.e., I am running a
Debian GNU/Linux box that has VirtualBox, and I have a Windows XP as a
guest inside VirtualBox). But I attributed it to my setup (usage of
VirtualBox) as I was told that my code did run OK in a "true" Windows
machine with R-2.11.

By the way, the problem did not always show up, just most of the time
(about 80% to 90% of the attempts).

Best,

R.
Hello,

I was using snow to parallel-process some code in R-2.10 (32-bit
windows. ). The code is as follows:

require(foreach)
require(doSNOW)

cl <- makeCluster(6, type='SOCK')
registerDoSNOW(cl)
bl2 <- foreach(i=icount(length(unqmrno))) %dopar% {
(some code here)
}
stopCluster(cl)

When I run the same code in Windows R-2.11 (either 32-bit or 64-bit), R
hangs at cl<-makeCluster(6, type='SOCK') and no R processes are spawned.
I was wondering if others have encountered this problem, and any
suggestions on solving this would be greatly appreciated.
--

Abhijit Dasgupta, PhD

Statistician | Clinical Sciences Section | NIAMS/NIH

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