Guillaume,
please read ?multicore -- especially the section "Warning".
Cheers,
Simon
On Jan 15, 2010, at 9:42 , Guillaume Chapron wrote:
Hello,
I have this test function:
onerun <- function(j) {
p <- numeric(10)
for (i in 1:9) {
p[i+1] <- j + p[i]
}
return(p)
}
Then I can call:
lapply(1:100, onerun)
I would like to multi-thread this, so I do:
library(multicore)
mclapply(1:100, onerun)
and it works.
But when I increase the size of the computations, i.e.
mclapply(1:10000, onerun)
it crashes with this error message:
The process has forked and you cannot use this CoreFoundation
functionality safely. You MUST exec().
Break on
__THE_PROCESS_HAS_FORKED_AND_YOU_CANNOT_USE_THIS_COREFOUNDATION_FUNCTIONALITY___YOU_MUST_EXEC__
() to debug.
What do I do wrong? I have a dual core MBP.
Thanks!
Guillaume
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