diff options
| author | Jean Boussier <[email protected]> | 2023-11-30 08:28:41 +0100 |
|---|---|---|
| committer | Jean Boussier <[email protected]> | 2023-11-30 15:48:21 +0100 |
| commit | 3c5a3b73f1126f3e05e85a20f3991bb6c22b4be3 (patch) | |
| tree | a9448738019e319574136810020320d82d22841b | |
| parent | 630c97acc74701724b3a1beb3f92aae192c69769 (diff) | |
Highlight some GC improvements in NEWS
3.3. got some major GC changes that do translate in very meaningful
performance gains, we should surface that.
| -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 |