3

I am trying to run the example for doSMP posted here: 

require(plyr) # make sure you have 1.2 or later installed
x <- seq_len(20)
wait <- function(i) Sys.sleep(0.1)
system.time(llply(x, wait))
require(doSMP)
workers <- startWorkers(2) # My computer has 2 cores
registerDoSMP(workers)
system.time(llply(x, wait, .parallel = TRUE))

and I get the following warnings:

Warning messages:
1: <anonymous>: ... may be used in an incorrect context: ‘.fun(piece, ...)’

2: <anonymous>: ... may be used in an incorrect context: ‘.fun(piece, ...)’

What do these warnings mean, and should I worry about them?

edit:

getRversion() = 2.12.2
packageDescription("plyr", fields="Version") = 1.4
packageDescription("doSMP", fields="Version") = 1.0-1
Zach
  • 29,791
  • 35
  • 142
  • 201
  • What are your R and plyr version? (`getRversion()` and `packageDescription("plyr", fields="Version")`) – Marek Apr 05 '11 at 07:23
  • @Marek: 2.12.2 and 1.4. I edited my original post to reflect this. Any ideas? – Zach Apr 05 '11 at 14:56

1 Answers1

1

Are you using windows? I get the same error on linux. And also the same error with doSNOW.

Then I tried with doMC instead of doSMP and it worked fine.

f.jamitzky
  • 345
  • 1
  • 5
  • I get the same errors on both windows and a mac. doMC works fine on the mac, but isn't supported by windows. I think the author of the packages is working on a solution. – Zach Apr 13 '11 at 13:48
  • 1
    It turns out plyr only works with doMC, but the developer is working on it.http://stackoverflow.com/questions/5588914/domc-vs-dosnow-vs-dosmp-vs-dompi-why-arent-the-various-parallel-backends-for-f/5621388#5621388 – Zach Apr 13 '11 at 17:34