Ruby Issue Tracking System

12/26/2025

02:00 AM Ruby Revision f09e35ee (git): [ruby/date] [ruby/date] Optimize Gregorian date conversions with Neri-Schneider algorithm

Replace floating-point arithmetic and iterative loops with pure integer
operations for ~40% faster Date operations. Date.ordinal and Date.commercial
are ~2x faster due to O(1) first-day-of-year calculation.
Reference: https://arxiv.org/... maciej.mensfeld (Maciej Mensfeld)

02:00 AM Ruby Revision ea03f263 (git): [ruby/date] improve styling

https://github.com/ruby/date/commit/cd7a329dfd maciej.mensfeld (Maciej Mensfeld)

02:00 AM Ruby Revision bcaa127e (git): [ruby/date] code remarks, macros and r2.6 support

https://github.com/ruby/date/commit/2682dc79c0 maciej.mensfeld (Maciej Mensfeld)

02:00 AM Ruby Revision 5960fb9f (git): [ruby/date] remove redundant code

https://github.com/ruby/date/commit/5e6a458179 maciej.mensfeld (Maciej Mensfeld)

02:00 AM Ruby Revision 80242458 (git): [ruby/date] remove conditional for uint64_t

https://github.com/ruby/date/commit/47778c32d8 maciej.mensfeld (Maciej Mensfeld)

09/08/2025

11:23 AM Ruby Bug #19288: Ractor JSON parsing significantly slower than linear parsing

I can confirm significant performance improvements with the new Ractor APIs. I will now proceed to benchmark this against real Karafka user payloads. If the performance gains match what we're seeing in these synthetic benchmarks, I'll mo... maciej.mensfeld (Maciej Mensfeld)

05/15/2025

04:44 PM Ruby Bug #21342 (Closed): Segfault: invalid keeping_mutexes when using Mutex in Thread then Fiber after GC

Ruby crashes with a `[BUG] invalid keeping_mutexes error` when attempting to GC locked mutex that was used in a Thread within a Fiber context after garbage collection. The error indicates an attempt to unlock a mutex that is not locked, ... maciej.mensfeld (Maciej Mensfeld)

06/19/2024

04:06 PM Ruby Bug #20462: Native threads are no longer reused

byroot (Jean Boussier) wrote in #note-5:
> > Not sure if related
> ...
I myself do not rely on this explicitly. It came up during a deeper investigation related to high memory usage / potential memory leaks of 3.3.x. We've been postpon... maciej.mensfeld (Maciej Mensfeld)

12:24 PM Ruby Bug #20462: Native threads are no longer reused

Not sure if related but here's a benchmark of the impact (written by Gordon Chan):
```ruby
#!/usr/bin/env ruby
# Disable GC during the benchmark
GC.disable
# Get the current memory usage
mem_before = GC.stat[:malloc_increase_... maciej.mensfeld (Maciej Mensfeld)

06/18/2024

08:51 AM Ruby Bug #20462: Native threads are no longer reused

I also believe it can multiple any potential issues with resources leakage. Not sure yet what is causing this but working with a Rails user that sees this:
> I wrote a little script that creates 100k threads and can report 3.3.3 alloc... maciej.mensfeld (Maciej Mensfeld)