[ewg] RE: RFCv2: SRC API

[Tang, Changqing]

> 
> > Is there any performance worry to let j2(the first job on a 
> node) to 
> > do all the "work" ?
> 
> How do you mean?

I mean that j2 has all the QP connections with all other remote jobs, so
j2 does not save anything compared with non-SRC case, can this affect
j2's performance ?

I have another question, when using SRQ, or SRC+SRQ, when a completion
is returned by ibv_poll_cq(),  is there an easy way to find who sent
this message to me ? 'struct ibv_wc' does not say much about the message
source rank. The only field is 'src_qp', but I can not find any document
about how to use it.
Is there any way to return some kind of "source context" ?

Or do you think this is application's responsibility to figure out
source rank from the message itself ? I hope the source rank can be
identified before parsing the message.

Thanks.

--CQ



> 
> > What is the latency of SRC+SRQ ?
> 
> I'd expect it to be more or less the same as regular SRQ.
> 
> --
> MST
>