OTP 20.0发布，Erlang应用服务器

OTP 20.0 发布了，OTP (Open Telecom Platform) 是一个开源的 Erlang 分发和一个用 Erlang 编写的应用服务器。

Erlang / OTP 20.0是一个新的主要版本，新增了一些新功能，不少（特征）改进。与第二个候选版本相比的变化如下：

• ERTS:In the OTP 20 release candidates the function erlang:term_to_binary/1 changed the encoding of all atoms from ATOM_EXT to ATOM_UTF8_EXT and SMALL_ATOM_UTF8_EXT. This is now changed so that only atoms actually containing unicode characters are encoded with the UTF8 tags while other atoms are encoded ATOM_EXT just as before.

主要更新内容：

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.

• 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

• Improvements of timers internally in the VM resulting in reduced memory consumption and more efficient administration for timers

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.

……

完整更新内容请查看发行首页。

下载地址：

• Source code (zip)

• Source code (tar.gz)