luke-gru (Luke Gruber) - Ruby Issue Tracking System

	open	closed	Total
Assigned issues	1	20	21
Reported issues	12	51	63

Project	Roles	Registered on
Ruby	Committer	06/19/2025

02:26 PM Ruby Bug #21840 (Open): Locking a mutex can lead to starvation: I wasn't aware of those old issues. I'll take a look, thanks!
I reverted the commit because of issues with a `Monitor` test in CI. I thought it was related to this change, but the test kept failing even after the revert. It turns out it...

07:30 PM Ruby Bug #21836: RUBY_MN_THREADS deadlock and sleep issues: I'm confused about what should happen. Shouldn't it return roughly after 1 second instead of 10 seconds? I'll look into the sleep issue with `RUBY_MN_THREADS=1`, but I can't reproduce the deadlock or segfault with a more recent commit (a... luke-gru (Luke Gruber)
07:13 PM Ruby Bug #21685: Unnecessary context-switching, especially bad on multi-core machines.: I did some benchmarking based on the updated solution (https://github.com/ruby/ruby/pull/15840). I've attached Puma benchmark results that I got using the PR from the previous post (d7ef5ecc9b) vs that PR's base commit (ad6b85450d). The ... luke-gru (Luke Gruber)

09:02 PM Ruby Feature #21843 (Open): Simple Priority Scheduler: Hi,
There's a problem with Ruby's scheduler that I want to solve.
# The Problem
Since Ruby schedules threads using round-robin inside a Ractor, threads doing I/O after only running for a short time are punished. Once the I/O fin... luke-gru (Luke Gruber)

06:56 PM Ruby Bug #21840 (Open): Locking a mutex can lead to starvation: Continually locking a mutex `m` can lead to starvation if all other threads are on the waitq of `m`.
Let `T` be the thread that keeps on acquiring mutex `m` in a loop.
Iteration 1:
1) `T` locks mutex `m`
2) All other threads at... luke-gru (Luke Gruber)

08:12 PM Ruby Bug #21719: Thread deadlock with explicit require of a base clase in Linux Ruby 3.4: Here's my understanding of the issue after debugging it for a bit. This is based on `mame`'s code:
A: main thread
B: other thread
1. `A` calls `require` on `"./target"`, which locks the thread shield (TS) for the `"./target"` feature, ... luke-gru (Luke Gruber)

04:20 PM Ruby Bug #21812: Kernel#sleep without arguments returns immediately when subprocess exits in another thread (regression in Ruby 4.0): @mame Yes no problem, I have a fix coming. Thanks for the bisect btw, it saved me quite a bit of time 😊 luke-gru (Luke Gruber)

10:30 PM Ruby Bug #21696 (Closed): Performance degradation for long running processes in Ruby 4.0.0-preview2: luke-gru (Luke Gruber)
03:12 PM Ruby Bug #21685: Unnecessary context-switching, especially bad on multi-core machines.: I'm with John that I think this is very promising but should not be introduced in ruby 4.0. It needs more testing to make sure it's working correctly and it needs more benchmarks for more realistic workloads. We can't do that in 2 weeks.... luke-gru (Luke Gruber)

04:02 PM Ruby Bug #21710 (Closed): Segfault when reading object_id after it is set inside RUBY_INTERNAL_EVENT_NEWOBJ: luke-gru (Luke Gruber)

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