[erlang-questions] Erlang and Memory management

Jesper Louis Andersen <>
Thu Jun 2 11:33:11 CEST 2011


On Thu, Jun 2, 2011 at 10:53, Wenqiang Song <> wrote:
> A related question, for code like following:
> test(<<255, T/binary>>) ->
>     ok;
> test(<<_, T/binary>>) ->
>     test(T).
> Does Erlang copy the input binary for each recursion? If the input is huge,
> it would be very low efficient. If so, what should we do?

No. It just has a pointer into the existing binary. Immutability is nice :)

http://www.erlang.org/doc/efficiency_guide/binaryhandling.html

is the source you want to look at. Compile your code with the
bin_opt_info flag to see if optimizations trigger as well.


-- 
J.



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