Re: [OMPI users] Forcing TCP btl

2016-07-19 Thread Saliya Ekanayake
Thank you, Gilles. That explains it! On Tue, Jul 19, 2016 at 1:14 AM, Gilles Gouaillardet wrote: > basically, there are two methods (aka pml) to send/recv messages. > > ob1 is the basic one, it works with (all ?) interconnects that can > send/recv a stream of data > > pml/ob1 uses the available

Re: [OMPI users] Forcing TCP btl

2016-07-19 Thread Gilles Gouaillardet
basically, there are two methods (aka pml) to send/recv messages. ob1 is the basic one, it works with (all ?) interconnects that can send/recv a stream of data pml/ob1 uses the available btl(s) (tcp, openib, ...) cm is for feature rich interconnects that can send/recv messages pml/cm uses th

Re: [OMPI users] Forcing TCP btl

2016-07-19 Thread Saliya Ekanayake
Thank you, but what's mxm? On Tue, Jul 19, 2016 at 12:52 AM, Nathan Hjelm wrote: > You probably will also want to run with -mca pml ob1 to make sure mxm is > not in use. The combination should be sufficient to force tcp usage. > > -Nathan > > > On Jul 18, 2016, at 10:50 PM, Saliya Ekanayake > w

Re: [OMPI users] Forcing TCP btl

2016-07-19 Thread Nathan Hjelm
You probably will also want to run with -mca pml ob1 to make sure mxm is not in use. The combination should be sufficient to force tcp usage. -Nathan > On Jul 18, 2016, at 10:50 PM, Saliya Ekanayake wrote: > > Hi, > > I read in a previous thread > (https://www.open-mpi.org/community/lists/us

[OMPI users] Forcing TCP btl

2016-07-19 Thread Saliya Ekanayake
Hi, I read in a previous thread ( https://www.open-mpi.org/community/lists/users/2014/05/24475.php) that Jeff mentions it's possible for OpenMPI to pick up the openib transport if tcp is not requested explicitly. So, does that mean if I do, --mca btl ^openib that it's still possible for OpenMPI