Hello Martin, all 2011/12/15 Martin Sustrik <[email protected]>: > I think it would be a killer feature for HPC and financial services users. > So, definitely, go for it!
I will, looking at all the responses it seems that there's more interest for it than I had predicted :-) > Right. And given the transport is lossless, it should be easy to fragment > messages into datagrams. Indeed, besides verbs datagrams can be of arbitrary size up to 2GiB so it's very flexible in respect to mapping user messages to packets. >> - Connection management would be done using the RDMA connection >> manager library, this has semantics and an interface which resembles >> very closely TCP sockets and provides file descriptors for >> notification; establishing connections wouldn't look too different >> from what happens in tcp_listener_t/tcp_connecter_t > > Yes. > >> - Data transfer would be done with raw verbs calls, this would make >> use of a custom sender/receiver object, something akin to >> stream_engine_t. The ibverbs library supports file descriptors for >> signaling data transfer events so this should also fit well within the >> 0MQ model > > Exactly. > >> - The code would mainly go into separate files plus some changes to >> socket_base.cpp and session_base.cpp to support the new transport, >> relevant options and checks would be added to the autoconf >> infrastructure > > Yes. Good to hear that, then I'll start hacking right away. > Yes. This can be done on one-by-one basis. We have OS checking macros in 0MQ > so it should be easy. Also, it would be nice to have --with-ib or > --with-rdma option to configure to switch the compiling of this component > on. (Same as --with-pgm we are using to switch PGM support on.) I've already added a --enable-rdma option in my local repository plus the necessary checks and it's looking good. Would --with-rdma be preferred? In autoconf it's usually used for options where you need to specify something (e.g. --with-stuff=mystuff) while --enable is used for on/off flags. > Yes. Use mainline for new development. The code was much simplified since > 2.x times, so it'll be much easier for you. That sounds good, I'll create a branch on GitHub ASAP though I have to go through their docs first as I have never used the service before. > Yes. I think that's exactly the point. Using IB is not easy (unless you run > IPoIB on top of it) and this kind of project can possibly make it a viable > option for those without the extensive experience with RDMA. Yes and access to hardware is often a problem, I have a very limited stash myself and I use it only for light development, testing and experimentation. Gabriele _______________________________________________ zeromq-dev mailing list [email protected] http://lists.zeromq.org/mailman/listinfo/zeromq-dev
