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Subject: Re: [OMPI devel] SDP support for OPEN-MPI
From: Andrew Friedley (afriedle_at_[hidden])
Date: 2008-01-01 13:11:41


Patrick Geoffray wrote:
> Lenny Verkhovsky wrote:
>> We would like to add SDP support for OPENMPI.
>
>> SDP can be used to accelerate job start ( oob over sdp ) and IPoIB
>> performance.
>
> I fail to see the reason to pollute the TCP btl with IB-specific SDP stuff.
>
> For the oob, this is arguable, but doesn't SDP allow for *transparent*
> socket replacement at runtime ? In this case, why not use this mechanism
> and keep the code clean ?

Furthermore, why would a user choose to use SDP and TCP/IPoIB when the
OpenIB BTL is available using the native verbs interface? FWIW, this
same sort of question gets asked of the uDAPL BTL -- the answer there
being that the uDAPL BTL runs in places the OpenIB BTL does not. Is
this true here as well?

Andrew