[OMPI users] OpenMPI-1.10.0 bind-to core error

[Patrick Begou]

Hi,

I'm runing OpenMPI 1.10.0 built with Intel 2015 compilers on a Bullx System.
I've some troubles with the bind-to core option when using cpuset.
If the cpuset is less than all the cores of a cpu (ex: 4 cores allowed on a 8 
cores cpus) OpenMPI 1.10.0 allows to overload these cores  until the maximum 
number of cores of the cpu.
With this config and because the cpuset only allows 4 cores, I can reach 2 
processes/core if I use:

mpirun -np 8 --bind-to core my_application

OpenMPI 1.7.3 doesn't show the problem with the same situation:
mpirun -np 8 --bind-to-core my_application
returns:
/A request was made to bind to that would result in binding more//
//processes than cpus on a resource/
and that's okay of course.


Is there a way to avoid this oveloading with OpenMPI 1.10.0 ?

Thanks

Patrick

--
===================================================================
|  Equipe M.O.S.T.         |                                      |
|  Patrick BEGOU           | mailto:patrick.be...@grenoble-inp.fr |
|  LEGI                    |                                      |
|  BP 53 X                 | Tel 04 76 82 51 35                   |
|  38041 GRENOBLE CEDEX    | Fax 04 76 82 52 71                   |
===================================================================