[erlang-questions] 0MQ libraries

[Michael Truog]

On 01/30/2014 01:58 PM, Garrett Smith wrote:
> On Thu, Jan 30, 2014 at 3:13 PM, Joe Armstrong <erlang@REDACTED> 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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Yes, but https://github.com/gar1t/erlang-czmq has a GPLv3 license, while https://github.com/zeromq/erlzmq2 has a BSD license, so that can also affect the choice.  erlang-czmq appears impossible to use in any commercial way, including in a service (due to it being v3 of the GPL).  So, that is a concern, aside from it being slow.  Though, I am not a lawyer, I am not giving legal advice.