[erlang-questions] 0MQ libraries

Andreas Schultz <>
Fri Jan 31 09:47:41 CET 2014


Hi,

----- Original Message -----
> Yes - Google didn't suggest this.
> 
> Did anybody do any performance measurements on this?

Not yet, didn't have time for it :-(

Andreas

> 
> /Joe
> 
> 
> On Fri, Jan 31, 2014 at 8:45 AM, Benoit Chesneau <  >
> wrote:
> 
> 
> 
> 
> 
> 
> 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 Pieter Hintjens 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
> 
> 
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> 
> 
> 
> 
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-- 
-- 
Dipl. Inform.
Andreas Schultz

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