Vector API use for JRuby's json library

[Charles Oliver Nutter]

The developer experimenting with vectors has been running 21, so I did
suggest to him recently to try newer releases or dev builds. I'm out of
office right now but hoping to spend some time in the next week running
this through a profiler to see if other missed optimizations are
interfering with the vectorized version of the code.

I also pointed out the other vector-based json project to him that was
suggested by Daniel. I'm hopeful we can get more out of this than we have
seen so far once I can help profile and dig into optimized results a little
bit more.

There are many other places in JRuby where we could use this, such as for
handling text transcoding. There may even be some Ruby language constructs
that could be vectorized by JRuby's compiler. I wish I had more hours in
the day to experiment with this!

On Mon, Jul 28, 2025, 22:40 Paul Sandoz <paul.sandoz at oracle.com> wrote:

> Hi Daniel,
>
> Thanks for sharing. We have made progress optimizing the
> rearrange/selectFrom operations for UTF-8 related uses cases. The
> improvements were integrated into JDK release 24 [0].
> Further optimizations are in flight for slice operations with constant
> inputs [1], which I believe can simplify the referenced code and may
> further boost performance, but we need to verify.
>
> Charlie, what version of the JDK are you using?
>
> Paul.
>
> [0] https://openjdk.org/jeps/489
> [1] https://github.com/openjdk/jdk/pull/24104
>
> On Jul 16, 2025, at 10:46 AM, Daniel Lemire <daniel at lemire.me> wrote:
>
> Good day Charles,
>
> The following link might be relevant :
>
> https://github.com/simdjson/simdjson-java
>
> - Daniel
>
> After seeing similar work done for the C version of the Ruby json standard
> library, I suggested to the author that we could do the same for JRuby
> using the Vector API. So he went and did it!
>
> https://github.com/ruby/json/pull/824
>
> The results are somewhat mixed; performance of some cases is faster and
> other cases is slower. We would love to get input from anyone on this list
> interested in seeing another real-world use case for the Vector API.
>
> I'm hopeful we can pump up these numbers with some additional tweaking in
> JRuby and json.
>
> *Charles Oliver Nutter*
> *Architect and Technologist*
> Headius Enterprises
> https://www.headius.com
> headius at headius.com
>
>
>
>
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