[ruby-core:117746] [Ruby master Bug#20462] Native threads are no longer reused
From:
"tenderlovemaking (Aaron Patterson) via ruby-core" <ruby-core@...>
Date:
2024-05-01 22:45:45 UTC
List:
ruby-core #117746
Issue #20462 has been reported by tenderlovemaking (Aaron Patterson).
----------------------------------------
Bug #20462: Native threads are no longer reused
https://bugs.ruby-lang.org/issues/20462
* Author: tenderlovemaking (Aaron Patterson)
* Status: Open
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
Ruby used to reuse native threads in order to amortize the cost of making a pthread.
For example this program:
```ruby
ntids = 1000.times.map {
Thread.new {
Thread.current.native_thread_id
}.value
}
p ntids.uniq.length
```
With Ruby 3.2.0, this would return 1. With Ruby 3.3.x, it returns 1000. It means we cannot amortize the cost of a pthread for short lived threads.
I was able to bisect this to commit be1bbd5b7d40ad863ab35097765d3754726bbd54. But the change is big so I don't know how to fix it.
--
https://bugs.ruby-lang.org/
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