[ruby-core:118496] [Ruby master Bug#20618] ruby uses 1/2 (8 out of 16) cores for 16 ractors

[ruby-core:118496] [Ruby master Bug#20618] ruby uses 1/2 (8 out of 16) cores for 16 ractors

[skorobogatydmitry (Dmitry Skorobogaty) via ruby-core]

Issue #20618 has been reported by skorobogatydmitry (Dmitry Skorobogaty).

----------------------------------------
Bug #20618: ruby uses 1/2 (8 out of 16) cores for 16 ractors
https://bugs.ruby-lang.org/issues/20618

* 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
----------------------------------------
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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[ruby-core:118536] [Ruby master Bug#20618] ruby uses 1/2 (7 out of 16) cores for 16 ractors

[alanwu (Alan Wu) via ruby-core]

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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 ______________________________________________
 ruby-core mailing list -- ruby-core@ml.ruby-lang.org
 To unsubscribe send an email to ruby-core-leave@ml.ruby-lang.org
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[ruby-core:118540] [Ruby master Bug#20618] ruby uses 1/2 (7 out of 16) cores for 16 ractors

[ko1 (Koichi Sasada) via ruby-core]

Issue #20618 has been updated by ko1 (Koichi Sasada).


Thanks @alanwu 

Please use `RUBY_MAX_PROC` to increase the processors.

----------------------------------------
Bug #20618: ruby uses 1/2 (7 out of 16) cores for 16 ractors
https://bugs.ruby-lang.org/issues/20618#change-109059

* 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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 ______________________________________________
 ruby-core mailing list -- ruby-core@ml.ruby-lang.org
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