[openib-general] MPI Brodcast doubt

[eitan at dev.mellanox.co.il]

>
> I have 3 nodes connected via IB as shown below:
>
> node1 ---> switch1 ---> node2
>                     |----------> node3
>
> If node1 sends a brodcast message to node2 and node3, I want to know if
> the
> message is delivered to the switch twice (first time for node2 and second
> time for node3) or just once (where switch will know by looking at some
> headers or so that its a brodcast message and will send it on all the
> outgoing ports) ?
Message delivered once. Switch duplicates it.

EZ