[ruby-core:118818] [Ruby master Bug#20634] ruby uses 1/2 (7 out of 16) cores for 16 ractors with RUBY_MAX_CPU=16 environment variable set
From:
"skorobogatydmitry (Dmitry Skorobogaty) via ruby-core" <ruby-core@...>
Date:
2024-08-09 08:31:24 UTC
List:
ruby-core #118818
Issue #20634 has been updated by skorobogatydmitry (Dmitry Skorobogaty).
I just checked - the problem doesn't repro-es on HEAD (ruby 3.4.0dev (2024-08-09T03:16:23Z master f57167d338) [x86_64-linux])
Could you close it ?
----------------------------------------
Bug #20634: ruby uses 1/2 (7 out of 16) cores for 16 ractors with RUBY_MAX_CPU=16 environment variable set
https://bugs.ruby-lang.org/issues/20634#change-109382
* Author: skorobogatydmitry (Dmitry Skorobogaty)
* Status: Open
* ruby -v: ruby 3.3.1 (2024-04-23 revision c56cd86388) [x86_64-linux]
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
It's a cont for #20618, feel free to close this one and reopen the original bug.
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
```
Command I ran was `RUBY_MAX_CPU=16 ruby test.rb`. Adding `RUBY_MN_THREADS=1` increases CPU usage to 8 cores, possibly due to N:M for the main Ractor.
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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