[erlang-questions] 0MQ libraries

Benoit Chesneau <>
Fri Jan 31 08:45:36 CET 2014


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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