On May 29, 2014, at 8:04 PM, Henric Winell <nilsson.hen...@gmail.com> wrote:
> Simon Urbanek skrev 2014-05-29 15:06: >> Dario, >> >> yes, that is a bug, now fixed. > > Thanks for fixing it. > > This problem was independently reported some time ago > (https://bugs.r-project.org/bugzilla/show_bug.cgi?id=15016) and I believe > that it can now be closed. > Ah, thanks, done, Simon > >> >> 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 >>> >> >> ______________________________________________ >> R-devel@r-project.org mailing list >> https://stat.ethz.ch/mailman/listinfo/r-devel >> > ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
