[erlang-questions] Erlang and Akka
Richard A. O'Keefe
Fri Aug 29 00:10:41 CEST 2014
On 29/08/2014, at 2:18 AM, Xiao Jia wrote:
> So what if we have both Erlang(-style) concurrency and C++ performance (for number crunching, ...) in some new language (yet to be developed)?
C++ performance relies on several things.
One of them is the type system.
We know how to get close-to-C performance in a functional
language; Xavier Leroy did an impressive job with OCaml.
It depends on a good type system.
The trick is to extend the type system to send and receive.
This seems like the weakest aspect of Dialyzer: I cannot
say "X is a process id for a process that expects
messages of type Y".
Get the type system right and the rest will follow.
Of course, one of Erlang's strengths has always been that you
don't *have* to use types.
Having said that, I must emphasise once more that
"I am writing in C++" does NOT imply "my code is efficient".
I have known *interpreted* Scheme to run faster than
*compiled* C++. Memory management is a tricky subject and
manual (delete) or semi-manual (smart pointers) is NOT always
> Regardless of community size, reusable libraries and other "human-related" issues commonly faced by any new language, can we say such a new language is better than both Erlang and C++ because it (potentially) beats both in performance and concurrency, respectively?
One of the saddest errors in classical philosophy was the use
of "better" as though it was unequivocal. Let E be Erlang,
C be C++, and N be the new language. It is possible that
N >= E (concurrency)
N > E (performance)
N < E (readability)
N < E (human error rate)
N > C (concurrency)
N >= C (performance)
N < C (readability -- unlikely but for the sake of argument)
N < C (human error rate -- again unlikely but still)
We would then have to say that N is better than E and C
AND ALSO that N is worse than E and C.
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