[zeromq-dev] Urgent! Where is the link between ZeroMq and IpoIB

artemv zmq artemv.zmq at gmail.com
Tue May 6 09:54:00 CEST 2014


Hi Kristina N.   Next time avoid word "urgent" .   Thanks.


2014-05-05 23:53 GMT+03:00 Jim Garlick <garlick at llnl.gov>:

> Hi Krishna,
>
> As far as I know ZeroMQ can only use IPoIB via normal IP sockets.
> Looks like the idea of an RDMA zeromq transport came up in 2011,
> but went nowhere?
>
> http://lists.zeromq.org/pipermail/zeromq-dev/2011-December/014784.html
>
> Another interesting example of adding RDMA support to a project with
> pluggable transports is net/9p (transport for fs/v9fs) in the Linux kernel.
> It might be useful to look at that code and follow its history to
> understand
> the problem better.
>
> http://lwn.net/Articles/301896/
>
> As I recall the orig code in 2008, though functional, didn't deliver a big
> performance win over TCP (for that stack) and introduced new failure modes,
> making it unattractive and frustrating for casual users.  It languished
> for years in a semi-broken state until people at CEA/Bull began working
> on it again in 2012-13.  I'm guessing the second order issues CEA/Bull
> dealt with would be instructive.  Also their Mooshika RDMA abstraction,
> which I think allows for a wireshark tap and testing w/o Infiniband card
> could be interesting.
>
> https://github.com/martinetd/mooshika
>
> Jim
>
> On Mon, May 05, 2014 at 07:38:05PM +0200, Krishna Narasimhan wrote:
> > Hello,
> >         I am a researcher at Frankfurt University and currently working
> on
> > contributing to folks who use ZeroMq at Gsi , Darmstadt. Can anyone guide
> > me on which part of the code links ZeroMq to IPoIB. Because it doesnt
> seem
> > to be linked at code level. Does ZeroMq call some wrapper which directs
> to
> > IPoIb or normal IP?
> >
> > Any help here would be appreciated. this is rather urgent.
> >
> > On the other hand, I am also looking to contribute to including MPI
> (direct
> > RDMA) access for ZeroMq based applications, so anyone with this knowledge
> > will also be helpful. But am not sure this belongs to this thread.
> >
> > Thanks a lot.
> >
> > Regards
> >        Krishna
>
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>
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