[ruby-core:121214] [Ruby master Bug#21164] Performance Regression using --jit
From:
"k0kubun (Takashi Kokubun) via ruby-core" <ruby-core@...>
Date:
2025-03-01 09:20:14 UTC
List:
ruby-core #121214
Issue #21164 has been updated by k0kubun (Takashi Kokubun).
Glad to hear that.
Just curious, were those two Rubies installed differently previously? For example, rbenv (ruby-build) is known to install Ruby with `--enable-shared`, which usually degrades the performance by a few %, so installing one with rbenv and the other with something else could be a problem.
----------------------------------------
Bug #21164: Performance Regression using --jit
https://bugs.ruby-lang.org/issues/21164#change-112155
* Author: purbug28 (puni ru)
* Status: Feedback
* ruby -v: ruby 3.4.2 (2025-02-15 revision d2930f8e7a) +PRISM [x86_64-linux]
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
Ruby 3.4.2 --jit runs slower than no JIT, while Ruby 3.3.7 --jit runs faster.
```ruby
# frozen_string_literal: true
n = 200000
c = Array.new(n + 1, 0)
(1..n).each do |i|
a = []
m = 100
(1..m).each do
a << i
c[i] += 1
a << i / m
c[i % m] += 1
end
end
puts c.sum
```
results of /usr/bin/time
ruby 3.4.2
--jit : 1.98user 0.03system 0:02.02elapsed 99%CPU (0avgtext+0avgdata 19692maxresident)k
no JIT: 1.77user 0.02system 0:01.80elapsed 99%CPU (0avgtext+0avgdata 18916maxresident)k
ruby 3.3.7
--jit : 1.20user 0.05system 0:01.26elapsed 99%CPU (0avgtext+0avgdata 23220maxresident)k
no JIT: 1.81user 0.02system 0:01.83elapsed 99%CPU (0avgtext+0avgdata 22952maxresident)k
`ruby -v --jit`
```
ruby 3.4.2 (2025-02-15 revision d2930f8e7a) +YJIT +PRISM [x86_64-linux]
```
--
https://bugs.ruby-lang.org/
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