[Rcpp-devel] how to get rid of the warning message: no graphics system to unregister

[Haiying Pang]

Thanks, Dirk, for the message. I did wrap the instance of RInside within an
MPI aware program to let MPI handle passing the copies to all the nodes.
The error  I have found so far is that I didn't pass the R reference
correctly, and that causes the huge output of the warning messages. I have
corrected it in the test code and the warning message has gone. now I am
testing it in the MPI setting..

On Mon, Feb 13, 2012 at 2:13 PM, Dirk Eddelbuettel <edd at debian.org> wrote:

>
> On 13 February 2012 at 13:38, Haiying Pang wrote:
> | Darren,
> |
> | I did create the R instance in main(), and pass the reference to another
> | function. I do have 1000 CPUs calling that function, but as they don't
> create
> | new R reference, how come there are so many warning messages?
> |
> | After reading your message in another thread of yours, I realize that the
> | troublesome part might be that the R reference is passed to a function
> that
> | many other CPUs call. what should I do to fix it? if I let each cpu
> creates its
> | own instance of R, will that end up with more warning messages?
>
> Now we're talking. Thanks for actually sharing your problem in proper
> terms.
>
> In short, you can't do that.
>
> R is single threaded, and you have to make sure that only thread calls back
> to R.  If you have a suitable problem, you can do what is shown in the mpi/
> example directory:  wrap RInside inside on an MPI aware program. That way
> MPI
> takes care of getting your program to the nodes, and each node gets its own
> copy.  Naturally, this means that you cannot just work on one large chunk
> of
> data.  You need to think your problem through, and maybe RInside is simply
> not part of the solution --- it does make any R restrictions (such as
> single
> threadedness) go away.
>
> Dirk
>
>
> | On Sat, Feb 11, 2012 at 8:34 PM, Darren Cook <darren at dcook.org> wrote:
> |
> |     > I am calling a R function through Rcpp and RInside in my c++
> program
> |     > in Linux. There are a lot of warning messages saying "no graphics
> |     > system to unregister" ...Is there anyone who knows the reason and
> how
> |     > to avoid the printing of such warning messages?
> |
> |     Generally, once you track down the line causing the problem,
> |     suppressWarnings() (an R function) might help. Or
> |     suppressPackageStartupMessages() or suppressMessages() may help.
> |
> |     For the cause, are you running on a machine with no GUI or X server?
> |
> |     However, a google suggests this is a message related to shutting
> down R,
> |     and implies your script has corrupted something. There appears to be
> no
> |     fix as they, like Dirk, insisted on a reproducible example.
> |
> |     I'm wondering why you would be starting up and shutting down R so
> many
> |     times in your script. Do you create one RInside instance, either as a
> |     global, or in main() and then pass it around by reference? Or are you
> |     create RInside instances inside other functions, or inside loop
> bodies?
> |     If the latter, can you refactor to do the former so you only have one
> |     instance?
> |
> |     HTH,
> |     Darren
> |
> |
> |     --
> |     Darren Cook, Software Researcher/Developer
> |
> |     http://dcook.org/work/ (About me and my work)
> |     http://dcook.org/blogs.html (My blogs and articles)
> |     _______________________________________________
> |     Rcpp-devel mailing list
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> |
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> |
> |
> |
> |
> | --
> | Haiying Pang
> |
> | ----------------------------------------------------------------------
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>



-- 
Haiying Pang
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