[erlang-questions] 0MQ libraries

Joe Armstrong <>
Fri Jan 31 12:10:42 CET 2014


On Fri, Jan 31, 2014 at 10:28 AM, Andreas Schultz <> wrote:

> BTW: We have a small workshop with Pieter Hintjens on Feb, 10th in Berlin
> on exactly how to best support 0MQ in Erlang for our own projects.
>

Great - say hello to Pieter from me


>
> Depending on the outcome, this will most likely mean that we are going to
> upgrade gen_zmq to the latest zmtp wire protocol.
>

Brilliant - great news

/Joe



>
> Andreas
>
> ----- Original Message -----
> >
> >
> >
> > On Fri, Jan 31, 2014 at 8:12 AM, Joe Armstrong <  >
> wrote:
> >
> >
> >
> > Let me pitch a silly idea at you.
> >
> > Why don't we just use gen_tcp and interact with 0MQ peers using the
> > wire-line protocol. Erlang is good at getting data in and out of sockets,
> > and good at parsing binary packets.
> >
> > This method is safe and efficient. I mailed  about this
> > and he thought this was perfectly doable.
> >
> > I'm not suggesting implementing all the protocols and transports to start
> > with
> > just the REQ - REP protocols of TCP
> >
> > Pieter suggest looking at
> >
> > https://github.com/zeromq/zmtp
> > https://github.com/zeromq/libzmq/blob/master/tests/test_stream.cpp
> >
> > These implement the wire-line protocol on top of tcp rather than through
> the
> > 0mz library so its easier to see whats going on.
> >
> > Now I haven't a clue if this is a silly idea or not - but a few hours
> > tinkering
> > should be enough to implement the REQ-REP protocols and make some
> performance
> > measurements - and that would tell me if it's worth implementing more
> > protocols
> > and transports.
> >
> > The difficulty of this is not writing the code - but understanding the
> > wire-line protocol
> > but I think Pieter has done a good job here, there are a load of RFCs at
> the
> > 0MQ web site.
> >
> > ( actually all I want to do is get Erlang talking to Julia - Julia
> speaks 0MQ
> > and I found that I
> > couldn't build the Erlang 0MQ bindings with the latest 0MQ - so I'm again
> > back to
> > "fixing stuff thats broken" in order to do what I want. I don't really
> want
> > to have to re-implement
> > the 0MQ wire-line protocol to do this - but it does seem easier than
> fixing
> > up the broken library
> > and maintaining it (I guess it's easier since I only need a fraction of
> the
> > entire protocol))
> >
> > Comments
> >
> > /Joe
> >
> >
> > gen_zmq was doing that but it wasn't update since a long time:
> >
> > https://github.com/RoadRunnr/gen_zmq
> >
> > Maybe a good start?
> >
> > - benoit
> >
> >
> >
> >
> >
> > On Thu, Jan 30, 2014 at 10:58 PM, Garrett Smith <  > wrote:
> >
> >
> >
> > On Thu, Jan 30, 2014 at 3:13 PM, Joe Armstrong <  >
> wrote:
> > > Is anybody working on upgrading the 0MQ libraries for erlang to
> > > the latest version of 0QM.
> >
> > I would be tempted to upgrade them, but I've wanted to have an
> > external C port implementation of the 0MQ bindings for a while and so
> > created this:
> >
> > https://github.com/gar1t/erlang-czmq
> >
> > In my three years of experience with the 0MQ bindings, it's been
> > (historically) very easy to crash the Erlang VM. For my applications,
> > speed will never justify the cost of taking an entire node down. The
> > CZMQ bindings I have here are quite slow relative to erlzmq2 (~ 5 - 10
> > times slower). I'm sure they can be made much faster, but my thinking
> > is that running multiple external ports could alleviate this.
> >
> > Speed kills.
> >
> > This code is not running in production, but it will be soon.
> >
> > The CZMQ API in my opinion is the right target for new 0MQ bindings,
> > regardless of how they're implemented. Pieter Hintjen's rationale for
> > writing CZMQ is here:
> >
> > https://github.com/zeromq/czmq#scope-and-goals
> >
> > Garrett
> >
> >
> > _______________________________________________
> > erlang-questions mailing list
> > 
> > http://erlang.org/mailman/listinfo/erlang-questions
> >
> >
> >
> > _______________________________________________
> > erlang-questions mailing list
> > 
> > http://erlang.org/mailman/listinfo/erlang-questions
> >
>
> --
> --
> Dipl. Inform.
> Andreas Schultz
>
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