Re: [OMPI users] Ideal MTU in Infiniband

2008-01-10 Thread Jeff Squyres
In an Open MPI installation, have a look in $prefix/share/openmpi/mca- btl-openib-hca-params.ini, find your HCA hardware, and you'll see what value Open MPI sets the MTU to. Hope that helps. On Jan 10, 2008, at 1:56 PM, Parag Kalra wrote: But still can someone please tell the numerical valu

Re: [OMPI users] Ideal MTU in Infiniband

2008-01-10 Thread Parag Kalra
But still can someone please tell the numerical value that is idealy set or should be set. On Jan 10, 2008 8:29 PM, Gleb Natapov wrote: > On Thu, Jan 10, 2008 at 06:23:50PM +0530, Parag Kalra wrote: > > Hello all, > > > > Any ideas? > Yes. The idea is that Open MPI knows what best. Run it with a

Re: [OMPI users] Ideal MTU in Infiniband

2008-01-10 Thread Gleb Natapov
On Thu, Jan 10, 2008 at 06:23:50PM +0530, Parag Kalra wrote: > Hello all, > > Any ideas? Yes. The idea is that Open MPI knows what best. Run it with a default value. Usually bigger MTU is better, but some HW has bugs. Open MPI knows this and choses the best value for your HW. > > -- > Parag Kalr

Re: [OMPI users] Ideal MTU in Infiniband

2008-01-10 Thread Parag Kalra
Hello all, Any ideas? -- Parag Kalra On Jan 10, 2008 4:15 AM, Parag Kalra wrote: > Hello all, > > I am using Open MPI with Infiniband configured. > > What should be the ideal MTU size for infiniband? > > -- > PARAG . A . KALRA > > > >