Bug #20659
Updated by alanwu (Alan Wu) 3 months ago
The [`mail` benchmark from yjit-bench][1] is about 20% slower on `master` compared to commit:98eeadc9 ("Development of 3.4.0 started.") as the baseline, comparing running time of the Ruby process running the benchmark for a single iteration. Much of this workload is Ruby parsing.
```
$ hyperfine -L ruby '3.3-equiv/bin/ruby,before-numeric-nodes/bin/ruby,master/bin/ruby' '~/.rubies/{ruby} -Iharness-once benchmarks/mail/benchmark.rb'
Benchmark 1: ~/.rubies/3.3-equiv/bin/ruby -Iharness-once benchmarks/mail/benchmark.rb
Time (mean ± σ): 889.0 ms ± 2.0 ms [User: 776.9 ms, System: 111.7 ms]
Range (min … max): 885.7 ms … 892.1 ms 10 runs
Benchmark 2: ~/.rubies/before-numeric-nodes/bin/ruby -Iharness-once benchmarks/mail/benchmark.rb
Time (mean ± σ): 891.7 ms ± 1.6 ms [User: 794.5 ms, System: 96.9 ms]
Range (min … max): 889.0 ms … 894.7 ms 10 runs
Benchmark 3: ~/.rubies/master/bin/ruby -Iharness-once benchmarks/mail/benchmark.rb
Time (mean ± σ): 1.086 s ± 0.003 s [User: 0.951 s, System: 0.134 s]
Range (min … max): 1.080 s … 1.091 s 10 runs
Summary
'~/.rubies/3.3-equiv/bin/ruby -Iharness-once benchmarks/mail/benchmark.rb' ran
1.00 ± 0.00 times faster than '~/.rubies/before-numeric-nodes/bin/ruby -Iharness-once benchmarks/mail/benchmark.rb'
1.22 ± 0.00 times faster than '~/.rubies/master/bin/ruby -Iharness-once benchmarks/mail/benchmark.rb'
$ for tag in 3.3-equiv master before-numeric-nodes; do echo $tag: $(~/.rubies/$tag/bin/ruby -v); done
3.3-equiv: ruby 3.4.0dev (2023-12-25T09:13:40Z master 98eeadc932) [x86_64-linux]
master: ruby 3.4.0dev (2024-07-30T14:01:43Z master 1164b6a7ba) [x86_64-linux]
before-numeric-nodes: ruby 3.4.0dev (2024-01-06T18:26:38Z master 76afbda5b5) [x86_64-linux]
```
Using Valgrind's DHAT reveals that commit:1b8d01136c3ff6c60325c7609d61e19ac42acd9f ("Introduce Numeric Node's") issues roughly 3 times more malloc(3) `malloc` calls compared to the baseline, most of them coming comping from strdup() calls in set_number_literal().
Comparison with `--parser=prism`, for interest:
<details>
```
$ hyperfine -L ruby '3.3-equiv/bin/ruby,before-numeric-nodes/bin/ruby,master/bin/ruby,master/bin/ruby --parser=prism' \
'~/.rubies/{ruby} -Iharness-once benchmarks/mail/benchmark.rb'
Benchmark 1: ~/.rubies/3.3-equiv/bin/ruby -Iharness-once benchmarks/mail/benchmark.rb
Time (mean ± σ): 889.7 ms ± 2.6 ms [User: 771.4 ms, System: 118.0 ms]
Range (min … max): 885.8 ms … 894.6 ms 10 runs
Benchmark 2: ~/.rubies/before-numeric-nodes/bin/ruby -Iharness-once benchmarks/mail/benchmark.rb
Time (mean ± σ): 890.4 ms ± 1.6 ms [User: 776.8 ms, System: 113.3 ms]
Range (min … max): 888.4 ms … 892.9 ms 10 runs
Benchmark 3: ~/.rubies/master/bin/ruby -Iharness-once benchmarks/mail/benchmark.rb
Time (mean ± σ): 1.087 s ± 0.004 s [User: 0.968 s, System: 0.119 s]
Range (min … max): 1.083 s … 1.097 s 10 runs
Benchmark 4: ~/.rubies/master/bin/ruby --parser=prism -Iharness-once benchmarks/mail/benchmark.rb
Time (mean ± σ): 826.9 ms ± 2.1 ms [User: 725.8 ms, System: 100.7 ms]
Range (min … max): 823.6 ms … 830.9 ms 10 runs
Summary
'~/.rubies/master/bin/ruby --parser=prism -Iharness-once benchmarks/mail/benchmark.rb' ran
1.08 ± 0.00 times faster than '~/.rubies/3.3-equiv/bin/ruby -Iharness-once benchmarks/mail/benchmark.rb'
1.08 ± 0.00 times faster than '~/.rubies/before-numeric-nodes/bin/ruby -Iharness-once benchmarks/mail/benchmark.rb'
1.31 ± 0.01 times faster than '~/.rubies/master/bin/ruby -Iharness-once benchmarks/mail/benchmark.rb'
```
</details>
[1]: https://github.com/Shopify/yjit-bench/blob/b8f1bd8931d4757afdae933ef6f11e0767ba90b8/benchmarks/mail/benchmark.rb