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| -rw-r--r-- | NEWS.md | 21 |
1 files changed, 21 insertions, 0 deletions
@@ -235,6 +235,25 @@ changelog for details of the default gems or bundled gems. * `defined?(@ivar)` is optimized with Object Shapes. * Name resolution such as `Socket.getaddrinfo` can now be interrupted. [[Feature #19965]] +### GC + +* Major performance improvements over 3.2 + * Young objects referenced by old objects are no longer immediately + promoted to the old generation. This significantly reduces the frequency of + major GC collections. [[Feature #19678]] + * A new `REMEMBERED_WB_UNPROTECTED_OBJECTS_LIMIT_RATIO` tuning variable was + introduced to control the number of unprotected objects cause a major GC + collection to trigger. The default is set to `0.01` (1%). This significantly + reduces the frequency of major GC collection. [[Feature #19571]] + * Write Barriers were implemented for many core types that were missing them, + notably `Time`, `Enumerator`, `MatchData`, `Method`, `File::Stat`, `BigDecimal` + and several others. This significantly reduces minor GC collection time and major + GC collection frequency. + * Most core classes are now using Variable Width Allocation, notably `Hash`, `Time`, + `Thread::Backtrace`, `Thread::Backtrace::Location`, `File::Stat`, `Method`. + This makes these classes faster to allocate and free, use less memory and reduce + heap fragmentation. + ### YJIT * Major performance improvements over 3.2 @@ -336,3 +355,5 @@ changelog for details of the default gems or bundled gems. [Feature #19843]: https://bugs.ruby-lang.org/issues/19843 [Bug #19868]: https://bugs.ruby-lang.org/issues/19868 [Feature #19965]: https://bugs.ruby-lang.org/issues/19965 +[Feature #19571]: https://bugs.ruby-lang.org/issues/19571 +[Feature #19678]: https://bugs.ruby-lang.org/issues/19678 |