Simple Distributed Erlang

问题

I've got a simple module:

-module(dist).
-compile([add/3]).
add(From,X,Y) ->
    From ! X+Y.

And I'm starting two nodes.

One with

erl -sname foo 

and another with

erl -sname bar

On the bar node I'm doing:

> c(dist).
{ok,dist}
> self().
<0.37.0>
> spawn('foo@unknown-00-23-6c-83-af-bd', dist, add, [self(), 3, 5]).

But the reponse I get is:

Error in process <0.48.0> on node 'foo@unknown-00-23-6c-83-af-bd' with exit value: {undef,[{dist,add,[<8965.37.0>,3,5]}]}

What does this error mean? I wondered if it meant that my foo node doesn't have this module defined? I didn't think it needed it, but the problem wasn't fixed by compiling dist in the foo node so I guess this isn't the problem.

回答1:

Export the add/3. Instead of a compile option.

-export([add/3]).

回答2:

if in the first node you use nl(module) then the beam of that module will be loaded to all connected nodes

来源：https://stackoverflow.com/questions/4199823/simple-distributed-erlang