Erlang/OTP 18.0 正式版发布

Posted 2021-04-24 OSC开源社区

Erlang/OTP 18.0 正式版发布了，这是一个全新的主要版本，包含一些全新特性，同时也跟老版本有一些不兼容，此外该版本使用 Apache 许可证。

Erlang/OTP 18.0 值得关注的改进有：

• Starting from 18.0 Erlang/OTP is released under the APL 2.0 (Apache Public License)

• erts: The time functionality has been extended. This includes a new API for time, as well as "time warp" modes which alters the behavior when system time changes. You are strongly encouraged to use the new API instead of the old API based on erlang:now/0. erlang:now/0 has been deprecated since it is a scalability bottleneck.
  

• For more information see the Time and Time Correction chapter of the ERTS User's Guide. Here is a link http://www.erlang.org/doc/apps/erts/time_correction.html
  

• erts: Beside the API changes and time warp modes a lot of scalability and performance improvements regarding time management has been made. Examples are:

• scheduler specific timer wheels,

• scheduler specific BIF timer management,

• parallel retrieval of monotonic time and system time on OS:es that support it.

• erts: The previously introduced "eager check I/O" feature is now enabled by default.

• erts/compiler: enhanced support for maps. Big maps new uses a HAMT (Hash Array Mapped Trie) representation internally which makes them more efficient. There is now also support for variables as map keys.

• dialyzer: The -dialyzer() attribute can be used for suppressing warnings
  in a module by specifying functions or warning options.
  It can also be used for requesting warnings in a module.

• ssl: Remove default support for SSL-3.0 and added padding check for TLS-1.0 due to the Poodle vulnerability.

• ssl: Remove default support for RC4 cipher suites, as they are consider too weak.

• stdlib: Allow maps for supervisor flags and child specs

• stdlib: New functions in ets:

• take/2. Works the same as ets:delete/2 but
  also returns the deleted object(s).

• ets:update_counter/4 with a default object as
  argument

详细列表请看 http://www.erlang.org/download/otp_src_18.0.readme