{"id":47817,"date":"2024-12-25T13:31:41","date_gmt":"2024-12-25T13:31:41","guid":{"rendered":"https:\/\/ubuntuhandbook.org\/?p=47817"},"modified":"2024-12-25T13:31:41","modified_gmt":"2024-12-25T13:31:41","slug":"ruby-3-4-released-with-it-modular-garbage-collector","status":"publish","type":"post","link":"https:\/\/ubuntuhandbook.org\/index.php\/2024\/12\/ruby-3-4-released-with-it-modular-garbage-collector\/","title":{"rendered":"Ruby 3.4 Released with ‘it’, Modular Garbage Collector, Improved YJIT"},"content":{"rendered":"

\"\"<\/a><\/p>\n

Ruby, the free open-source high-level general-purpose programming language, released new 3.4.0 (then 3.4.1 with quick fix) today at Christmas!<\/p>\n

The release introduced it<\/code> block parameter reference, which behaves very much the same as _1<\/code>. As the feature request<\/a> descripted:<\/p>\n

it<\/code> is implemented as a special case of getlocal<\/code> insn, not a method. it<\/code> without an argument is considered _1<\/code> or a normal local variable if defined. it<\/code> is considered a method call only when it has any positional\/keyword\/block arguments.<\/i><\/p><\/blockquote>\n

\"\"<\/a><\/p>\n

<\/p>\n

In Ruby 3.4, the socket library now features Happy Eyeballs Version 2 (RFC 8305)<\/b>. Which, ensures minimized connection delays, even if a specific protocol or IP address is delayed or unavailable.<\/p>\n

This feature is enabled by default. Though, can be disabled either on a per-method basis by using the keyword argument fast_fallback: false<\/code>, or globally by setting environment variable RUBY_TCP_NO_FAST_FALLBACK=1<\/code> or calling Socket.tcp_fast_fallback=false<\/code><\/p>\n

The release also introduced modular garbage collector (GC)<\/b>. It can be enabled at build time by --with-modular-gc<\/code> configuration option. To load at runtime, use the environment variable RUBY_GC_LIBRARY<\/code>.<\/p>\n

The built-in garbage collector has been splitted. It can be built as a library and enabled by environment variable RUBY_GC_LIBRARY=default<\/code>. While, there’s also an experimental GC library based on MMTk, which can be built then enabled by RUBY_GC_LIBRARY=mmtk<\/code>.<\/p>\n

The new release also switched the default parser from parse.y to Prism<\/b>. While the previous parser is available by using --parser=parse.y<\/code> command-line argument.<\/p>\n

The YJIT compiler has been improved with better performance on x86-64 and arm64 platforms, and less memory usage through compressed metadata and a unified memory limit.<\/p>\n

While, there are new --yjit-mem-size<\/code> command option to unify memory limit (default 128MiB) to track total YJIT memory usage, and --yjit-log<\/code> that enables a compilation log to track what gets compiled.<\/p>\n

Other changes in Ruby 3.4.0 include:<\/p>\n