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Subject: [OMPI devel] some questions regarding the portals modules
From: Jerome Soumagne (soumagne_at_[hidden])
Date: 2010-07-09 07:53:46


As I said in the previous e-mail, we've recently installed OpenMPI on a
Cray XT5 machine, and we therefore use the portals and the alps
libraries. Thanks for providing the configuration script from Jaguar,
this was very helpful, it had just to be slightly adapted in order to
use the latest CNL version installed on this machine.

I have some questions though regarding the use of the portals btl and
mtl components. I noticed that when I compiled OpenMPI with mpi-thread
support enabled and ran a job, the portals components did not want to
initialize due to these funny lines:

182 /* we don't run with no stinkin' threads */
183 if (enable_progress_threads || enable_mpi_threads) return NULL;

I'd like to know why are mpi threads disabled since threads are
supported on the XT5, does the btl/mtl require to have thread-safety
implemented or something like that or is it because of the portals
library itself ?

I would also like to use the MPI_Comm_accept/connect functions, it seems
that it's not possible to do that using the portals mtl even if the
spawn seems to be supported, did I do something wrong or is it really
not supported?
In this case, is it possible to extend this module to support these
functions? We could help in doing that.

I'd like also to know, are there any plans for creating a module in
order to use the DMAPP interface for the Gemini interconnect?



Jérôme Soumagne
Scientific Computing Research Group
CSCS, Swiss National Supercomputing Centre
Galleria 2, Via Cantonale  | Tel: +41 (0)91 610 8258
CH-6928 Manno, Switzerland | Fax: +41 (0)91 610 8282