[erlang-questions] erlc speed (or lack thereof), Make and emake

ノートン ジョーセフ ウェイ ン <>
Fri Jan 25 03:18:58 CET 2013

Bjorn -

Why do you think it isn't feasible to use rebar to build erlang applications within OTP?  

Just curious.


Joe N.

p.s. I have been toying with this idea on GitHub.


I haven't spent any significant time on this exercise … just out of curiosity.

On Jan 25, 2013, at 11:05 , Björn-Egil Dahlberg <> wrote:

> 2013/1/25 Scott Lystig Fritchie <>
> So, almost 1.3 seconds to start up and stop.  Some of that time is
> probably related to shutting down.  The rest is probably startup time.
> Some fraction of that is probably the same overhead that starting "erlc"
> from scratch each time, plus some overhead that "erlc" has that "erl"
> doesn't.  Reduce that sum of time, and you'll save a lot of time in your
> Makefile recipes.  Plus, that reduction would likely make "escript"
> startup times lower, which would also please a lot of the Erlang world
> also?
> Though we now have parallel code loading, we don't have parallel code fetching during boot. I think most of it is dynamic on-demand fetching in a sequential process anyways.
> I think something like spec:ing what modules should be loaded in default boot or app-file is the way to go. Start app -> batch parallel modules loading. We want something reasonable thought through. =)
> P.S. Keeping mouth shut since rebar's automatic parallellization doesn't
> seem to interest everyone else in the thread.... :-)
> rebar is awesome!
> I wonder why some people seem to shy away from it? 
> I don't know if it is feasible to use rebar to build erlang applications within otp. I don't think so. It would be nice to have something like that and Emake needs a lot more attention if it would have the same role. We don't want to make yet another make-tool. it's just silly, we have rebar.
> I think if we ever manage to move out applications from otp, that we still maintain, those should use rebar to build them. (I'm a big proponent of splitting down the monolithic otp-repo, let's say its not really prioritized). Within the otp-repo we will use make + erlc for the foreseeable future. 
> On another note,
> if rebar is the build-tool, what application is the concrete? A repository search and deploy engine?
> // Björn-Egil
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