[ruby-core:118536] [Ruby master Bug#20618] ruby uses 1/2 (7 out of 16) cores for 16 ractors
From:
"alanwu (Alan Wu) via ruby-core" <ruby-core@...>
Date:
2024-07-10 19:13:54 UTC
List:
ruby-core #118536
Issue #20618 has been updated by alanwu (Alan Wu).
Status changed from Open to Closed
I think this is an intended change from #19842. Please correct me if I'm wrong @ko1.
Emphasis mine:
> On the multiple Ractors, N (+ alpha) native threads run M ractors. **Now there is no way to disable M:N threads on multiple Ractors** because there are only a few multi-Ractor programs and no compatibility issues.
----------------------------------------
Bug #20618: ruby uses 1/2 (7 out of 16) cores for 16 ractors
https://bugs.ruby-lang.org/issues/20618#change-109055
* Author: skorobogatydmitry (Dmitry Skorobogaty)
* Status: Closed
* ruby -v: ruby 3.3.1 (2024-04-23 revision c56cd86388) [x86_64-linux]
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
According to `top`, the below code uses 7/16 cores (700%) of my AMD Ryzen 7 5800HS:
```
#!/usr/bin/env ruby
16.times {
Ractor.new {
10_000.downto(1) { |i|
100_000.downto(1) { |j|
i * j
}
}
}
}
sleep 30
```
The same code occupies all 16 cores on `ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x86_64-linux]`
The problem reproduces on `ruby 3.3.3 (2024-06-12 revision f1c7b6f435) [x86_64-linux]` (ruby from the latest docker image).
--
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