Erlang/OTP 20.0 是一个新的主要版本,带来了新功能、一些特征以及不兼容性的改进。
与第二次发布的 RC 版相比,只有很小的变化,下面列出了其中的一部分:
ERTS:
erlang:term_to_binary/1 更改了所有 atoms 的编码,由 ATOM_EXT 变为 ATOM_UTF8_EXT 和 SMALL_ATOM_UTF8_EXT。因此只有包含 unicode 字符的 atom 才使用 UTF8 标签编码,其他的 atoms像以前一样编码为 ATOM_EXT。
以下是 OTP 20 中的一些重要更新:
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.
下载地址:
http://erlang.org/download/otp_win32_20.0.exe
http://erlang.org/download/otp_win64_20.0.exe
Erlang 是一个结构化,动态类型编程语言,内建并行计算支持。最初是由爱立信专门为通信应用设计的,比如控制交换机或者变换协议等,因此非常适合于构建分布式,实时软并行计算系统。
软件详情:http://erlang.org/download/otp_src_20.0-rc2.readme
下载地址:http://www.erlang.org/news/114
来自:开源中国社区

