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Subject: Re: [OMPI users] [openMPI-infiniband] openMPI in IB network when openSM with LASH is running
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2007-11-28 11:28:04


There is work starting literally right about now to allow Open MPI to
use the RDMA CM and/or the IBCM for creating OpenFabrics connections
(IB or iWARP).

On Nov 28, 2007, at 4:37 AM, Keshetti Mahesh wrote:

> Has anyone in the list ever tested openMPI in infiniband network
> in which openSM is running with LASH routing algorithm enabled?
>
> I haven't tested the above case but i could foresee a problem
> because LASH routing algorithm in openSM uses virtual
> lanes (VL) which are directly mapped with service levels (SL).
> And LASH routing algorithm assigns different VLs (SLs) to different
> paths in the network. This SL <-> path association is available only
> through the subnet manager (openSM) during connection establishment.
> But AFAIK, openMPI don't use the services of subnet manager for
> connection establishment between nodes. So I want to know whether
> anyone
> thought about it and working on it or not.
>
> regards,
> Mahesh

-- 
Jeff Squyres
Cisco Systems