[Rcpp-devel] OpenMP and Rinside

[David Ibarra Gómez]

Thank you, Dirk.

I'll try with MPI, futhermore It'll be ready for a cluster enviroment.



David Ibarra Gomez
-----Mensaje original-----
De: Dirk Eddelbuettel [mailto:edd at debian.org]
Enviado el: martes, 31 de julio de 2012 13:39
Para: David Ibarra Gómez
CC: rcpp-devel at lists.r-forge.r-project.org
Asunto: Re: [Rcpp-devel] OpenMP and Rinside


On 31 July 2012 at 12:36, David Ibarra Gómez wrote:
| Hi Peter,
|
|         I'm looking at MPI examples, thank you for the advice.
|
| But If It's possible to use several instances with MPI. I think It should be possible with OpenMP.

You missed the subtle point that Open MPI spawns multiple _processes_ (which are independent) where Open MP spawns multiple _threads_ (which are not).

One works, the other doesn't.

Dirk

|
| Thank you
|
|
|
|
|
| David Ibarra Gomez
|
|
| -----Mensaje original-----
| De: Peter Aberline [mailto:Peter.Aberline at rms.com] Enviado el: martes,
| 31 de julio de 2012 12:32
| Para: David Ibarra Gómez; rcpp-devel at lists.r-forge.r-project.org
| Asunto: RE: OpenMP and Rinside
|
| > From: rcpp-devel-bounces at lists.r-forge.r-project.org
| > [mailto:rcpp-devel-bounces at lists.r-forge.r-project.org] On Behalf Of
| > David Ibarra Gómez
|
| > I was mixing RInside with OpenMP. When I try to run the software, I get a message in three of the four threads (4 Cores Multicore).
|
| > Exception caught: can only have one RInside instance Exception caught:
| > can only have one RInside instance Exception caught: can only have
| > one RInside instance
|
|
| Hi David,
|
| It's my understanding is that the RInside class is a singleton as R is strictly single threaded. The message  you are seeing if an exception thrown because the singleton constraint is violated.
|
| There are some examples that ship with RInside which demonstrate the use of multiple RInside processes using MPI. They might help you achieve the parallelism you are wanting.
|
| Correct me if I'm wrong, Dirk.
|
| Thanks
| Peter
|
|
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