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Bug #20618
closedruby uses 1/2 (7 out of 16) cores for 16 ractors
Status:
Closed
Assignee:
-
Target version:
-
ruby -v:
ruby 3.3.1 (2024-04-23 revision c56cd86388) [x86_64-linux]
Description
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).
Updated by skorobogatydmitry (Dmitry Skorobogaty) 4 months ago
- Subject changed from ruby uses 1/2 (8 out of 16) cores for 16 ractors to ruby uses 1/2 (7 out of 16) cores for 16 ractors
Updated by alanwu (Alan Wu) 4 months ago
- Status changed from Open to Closed
I think this is an intended change from #19842. Please correct me if I'm wrong @ko1 (Koichi Sasada).
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.
Updated by ko1 (Koichi Sasada) 4 months ago ยท Edited
Thanks @alanwu (Alan Wu)
Please use RUBY_MAX_CPU
to increase the processors.
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