[openib-general] [ANNOUNCE] ContributeRDS(ReliableDatagramSockets) to OpenIB

[James Lentini]

On Fri, 4 Nov 2005, Ranjit Pandit wrote:

> For Mpi running on a 10,000 node cluster with 2 or 4 way nodes, here
> are the QP/ CM connection requirements: (assuming intra node
> communication doesn't use IB)
> 
> Procs per node   uDapl/Sdp      Rds
> 2                       19996            9999
> 4                       39984            9999
> 
> Clearly, there is tradeoff in performance as we go from uDapl/Sdp to
> Rds. The choice will have to depend on the requirements of performance
> Vs Scalability.
> Btw, for this large a cluster, there is a huge overhead in just
> setting up the connections. Rds connections are setup only once.

This isn't an apples to apples comparison. uDAPL is an API and RDS is 
a protocol. You could implement RDS using a DAPL API, OpenIB verbs, 
etc. 

james