[openib-general] A critique of RDMA PUT/GET in HPC

[Greg Lindahl]

For those of you interested in this topic, there's an interesting
article by Patrick Geoffrey in HPCWire entitled "A Critique of RDMA".

http://www.hpcwire.com/hpc/815242.html

(you might have to be a subscriber, but I'm sure Patrick would send
you a copy if you ask.)

It's basically a critique of why SEND/RECV is better for MPI
implementations than PUT/GET.

Even if you don't agree with him, it's good reading. For motivation,
you might want to note that most of the SEND/RECV-based products
mentioned achieve better MPI 0-byte latency than IB Verbs-based MPI
implementations.

While I don't agree with everything Patrick says, this does get back
to my point that I've run into many people who assume that PUT/GET is
always the right way to do things. And it isn't.

-- greg