Dario,
yes, that is a bug, now fixed.
Cheers,
Simon
On May 29, 2014, at 2:00 AM, Dario Strbenac <dstr7...@uni.sydney.edu.au> wrote:
> Hello,
>
> I have a minimal example that shows a problem I'm having with parallel
> processing.
>
> library(parallel)
> mcmapply(function(x, y)
> {
> print("Running")
> Sys.sleep(10)
> }, as.list(1:10), as.list(10:1), mc.cores = 16, SIMPLIFY = FALSE)
>
> I see "Running" printed once every ten seconds. I read the documentation for
> mcmapply, but I don't understand why it wouldn't print all ten output
> statements almost at once, then wait for about ten seconds, then return to
> the prompt. Is it documented in another location ?
>
> My problem is that I have a section of code that takes a long time, which I
> have replaced with Sys.sleep in the above example, but when I look at the
> output of top, I only see 1 CPU being used. The computer has 16 processors.
>
>> sessionInfo()
> R version 3.1.0 (2014-04-10)
> Platform: x86_64-pc-linux-gnu (64-bit)
>
> locale:
> [1] LC_CTYPE=en_AU.UTF-8 LC_NUMERIC=C
> [3] LC_TIME=en_AU.UTF-8 LC_COLLATE=en_AU.UTF-8
> [5] LC_MONETARY=en_AU.UTF-8 LC_MESSAGES=en_AU.UTF-8
> [7] LC_PAPER=en_AU.UTF-8 LC_NAME=C
> [9] LC_ADDRESS=C LC_TELEPHONE=C
> [11] LC_MEASUREMENT=en_AU.UTF-8 LC_IDENTIFICATION=C
>
> attached base packages:
> [1] parallel stats graphics grDevices utils datasets methods
> [8] base
>
> loaded via a namespace (and not attached):
> [1] tools_3.1.0
>
> --------------------------------------
> Dario Strbenac
> PhD Student
> University of Sydney
> Camperdown NSW 2050
> Australia
>
> ______________________________________________
> R-devel@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>
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