On Wed, May 21, 2014 at 10:17 AM, Josef Leydold <josef.leyd...@wu.ac.at>wrote:
> I ran into an issue with the parallel package in R-3.1.0.
>
I have been experiencing a very similar issue within the RAppArmor package.
Here is a smaller example:
library(parallel)
for (n in 1:5) {
p <- mcparallel(sqrt(n))
#Sys.sleep(0.01)
res <- mccollect(p, wait=FALSE, timeout=1000)
mccollect(p)
if (is.null(res)) cat(n," NULL!\n")
}
If we run this, mccollect returns a lot of NULL values. However, after
uncommenting the sys.sleep, the problem disappears. Seems like some sort of
race condition.
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