[erlang-questions] Erlang/OTP 20.0-rc1 is available for testing

Alexander Petrovsky <>
Fri May 5 19:55:57 CEST 2017


пт, 5 мая 2017 г. в 18:10, Kenneth Lundin <>:

> OTP 20 Release Candidate 1
>
> This is the first of two release candidates before the OTP 20 release in
> June 2017.
>
> The intention with this release is that you as users try it and give us
> feedback if something does not work as expected. Could be a bug, an
> unexpected incompatibility, a significant change of characteristics in
> negative direction, etc.
>
> Erlang/OTP 20.0 is a new major release with new features, quite a few
> (characteristics) improvements, as well as a few incompatibilities.
>
> Here are some of the most important news:
> Potential Incompatibilities
>
>    -
>
>    ERTS:
>    - The non SMP Erlang VM is deprecated and not built by default
>       - Remove deprecated erlang:hash/2
>       - erlang:statistics/1 with scheduler_wall_time now also includes
>       info about dirty CPU schedulers.
>       - The new purge strategy introduced in OTP 19.1 is mandatory and
>       slightly incompatible for processes holding funs
>       see erlang:check_process_code/3.
>       - The NIF library reload is not supported anymore.
>    -
>
>    Asn1: Deprecated module and functions removed (asn1rt, asn1ct:encode/3
>    and decode/3)
>    -
>
>    Ssh: client only option in a call to start a daemon will now fail
>
> Highlights Erts:
>
>    - Dirty schedulers enabled and supported on VM with SMP support.
>    - support for “dirty” BIFs and “dirty” GC.
>    - erlang:garbage_collect/2 for control of minor or major GC
>    - Erlang literals are no longer copied when sending messages.
>
>
Could you explain please, what does mean "Erlang literals"?


>    -
>    - Improved performance for large ETS tables, >256 entries (except
>    ordered_set)
>    - erlang:system_info/1 atom_count and atom_limit
>    - Reduced memory pressure by converting sub-binaries to heap-binaries
>    during GC
>    - enif_select, map an external event to message
>
> Compiler:
>
>    - Code generation for complicated guards is improved.
>    - Warnings for repeated identical map keys. #{'a'=>1, 'b'=>2, 'a'=>3}
>    will warn for the repeated key a.
>    - By default there is now a warning when export_all is used. Can be
>    disabled
>    - Pattern matching for maps is optimized
>    - New option deterministic to omit path to source + options info the
>    BEAM file.
>    - Atoms may now contain arbitrary unicode characters.
>    - compile:file/2 has an option to include extra chunks in the BEAM
>    file.
>
> Misc other applications
>
>    - Unnamed ets tables optimized
>    - A new event manager to handle a subset of OS signals in Erlang
>    - Optimized sets add_element, del_element and union
>    - Added rand:jump/0-1
>    - When a gen_server crashes, the stacktrace for the client will be
>    printed to facilitate debugging.
>    - take/2 has been added to dict, orddict, and gb_trees.
>    - take_any/2 has been added to gb_trees
>    - Significantly updated string module with unicode support
>    - erl_tar support for long path names and new file formats
>    - Dtls: Documented API, experimental
>    - SSH: improving security, removing and adding algorithms
>    - New math:fmod/2
>
> For more details see
> http://erlang.org/download/otp_src_20.0-rc1.readme
>
> Pre built versions for Windows can be fetched here:
> http://erlang.org/download/otp_win32_20.0-rc1.exe
> http://erlang.org/download/otp_win64_20.0-rc1.exe
>
> On line documentation can be browsed here:
> www.erlang.org/documentation/doc-9.0-rc1/doc/
>
> Thanks to all contributors.
>
> /The Erlang/OTP team at Ericsson
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> 
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>
-- 
Петровский Александр / Alexander Petrovsky,

Skype: askjuise
Phone: +7 914 8 820 815
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