[erlang-questions] embedded systems erlang?
Wed Dec 17 09:40:30 CET 2014
On Monday, December 15, Raoul Duke wrote:
> I see many google hits for things people have done with Erlang
> targeting "embedded" resource constrained systems. But I'm not sure if
> there's like an official build or something for it?
There is no "official" build for "resource constrained" erlang.
But cross compilation, which is a hurdle for many embedded systems, has
been part of the official build for years now (it's definitely in R14B03,
probably appeared around R12 or R13)
> Does everybody hack up their own thing?
Yes, because different people's embedded systems are quite different.
> I'm looking at like 256 K RAM (!)
There's no way you'll get normal Erlang to run in that.
Just starting the shell on R14B03 on a 32 bit ARM CPU uses about 10 MB.
Older versions of Erlang, e.g. R7, were a bit less hungry, maybe 6 MB.
But 256 K is totally out of reach.
Here's erlang:memory() on an ARM, for a newly started emulator which
hasn't done anything other than start the shell:
Erlang R14B03 (erts-5.8.4) [source] [rq:1] [async-threads:0] [kernel-poll:false]
Eshell V5.8.4 (abort with ^G)
the values are in bytes. (The memory use according to the OS is 10 MB for
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