Ruby Issue Tracking System

03/13/2026

03:13 PM Ruby Revision 17747554 (git): [ruby/prism] Make it possible to lazily deserialize DefNode in Loader.java

* TRUFFLERUBY_METRICS_REPS=5 jt metrics time --experimental-options -e0
For parsing-core:
before: 0.097 0.099 0.092 0.096
after: 0.061 0.063 0.066 0.059
* Remove extra trailing spaces by using `<%-#`.
https://github.com/ruby/pris... Eregon (Benoit Daloze)

03/12/2026

10:15 AM Ruby Feature #21950: Add a built-in CPU-time profiler

byroot (Jean Boussier) wrote in #note-11:
> But I suspect supporting both isn't that much extra work?
I think it'd be good for this API to be able to say which one it wants (like `StackProf`'s `mode:` kwarg). Eregon (Benoit Daloze)

10:12 AM Ruby Feature #21950: Add a built-in CPU-time profiler

osyoyu (Daisuke Aritomo) wrote in #note-8:
> I don't want the API/output format to restrict what a profiler could emit. I wouldn't say such design is not doable, but careful consideration would be needed.
Careful consideration is exa... Eregon (Benoit Daloze)

03/11/2026

01:40 PM Ruby Feature #21950: Add a built-in CPU-time profiler

osyoyu (Daisuke Aritomo) wrote in #note-5:
> I am rather doubtful that CRuby/JRuby/TruffleRuby can share any profiler implementation at all.
They can't share the implementation of gathering backtraces (that's implementation-specific)... Eregon (Benoit Daloze)

01:37 PM Ruby Feature #21950: Add a built-in CPU-time profiler

osyoyu (Daisuke Aritomo) wrote in #note-5:
> I am rather doubtful that CRuby/JRuby/TruffleRuby can share any profiler implementation at all.
I think the opposite, I think it's actually easy to implement such an API on TruffleRuby and... Eregon (Benoit Daloze)

12:22 PM Ruby Bug #21828: An incorrect warning message related to `benchmark` is shown when using `benchmark-ips`

Thank you for the quick fix! Eregon (Benoit Daloze)

09:56 AM Ruby Bug #21828: An incorrect warning message related to `benchmark` is shown when using `benchmark-ips`

A main difference between both reproductions are the Gemfile.lock, for the reproduction in the issue description:
```
GEM
remote: https://rubygems.org/
specs:
benchmark-ips (2.14.0)
PLATFORMS
ruby
x86_64-linux
DE... Eregon (Benoit Daloze)

09:52 AM Ruby Bug #21828: An incorrect warning message related to `benchmark` is shown when using `benchmark-ips`

Interestingly it seems fixed for the original reproduction in the issue description, but *not* for the new reproduction of running `benchmark-ips`'s tests. Eregon (Benoit Daloze)

09:46 AM Ruby Bug #21828: An incorrect warning message related to `benchmark` is shown when using `benchmark-ips`

Also happens on `4.0-dev` from `ruby-build` (`ruby 4.0.1 (2026-03-10 revision 21f2bbf322) +PRISM [x86_64-linux]`). Eregon (Benoit Daloze)

09:38 AM Ruby Bug #21828 (Open): An incorrect warning message related to `benchmark` is shown when using `benchmark-ips`

As I said:
Eregon (Benoit Daloze) wrote in #note-6:
> still a problem on master
I have tried with `ruby 4.1.0dev (2026-03-11T07:46:22Z master c08f977ac7) +PRISM [x86_64-linux]` specifically.
Please try the reproduction before closing. Eregon (Benoit Daloze)