Re: [Jython-dev] A few micro-benchmarks for Jython 2 and two other ideas

[Albert C. <sap...@gm...>]

Thanks Jeff, that was an enjoyable read. Thanks for putting this
together and sharing it!

Missatge de Jeff Allen <ja...@fa...> del dia dt., 5 de gen.
2021 a les 23:56:
>
> I've been thinking about the implementation of a Jython core that would
> make proper use of dynamic language features in Java.
>
> Although peformance is secondary to correctness, one would like to avoid
> producing elegantly correct code that could only ever run like a slug.
> Numerical operations are indispensible, so I constructed JMH benchmarks
> for dispatch of unary and binary operations on int and float, when these
> are "hot code". The short version of the results is:
>
> 1. A core may be implemented (called here VSJ 2) that broadly follows
> CPython, but uses a Java method handle in place of each C pointer to
> function, and it will run at an acceptable speed. (Comparison is
> difficult between JMH and timeit, but it is fair to say VSJ 2 has "about
> the speed of CPython".)
>
> 2. Jython 2 is a lot faster than VSJ 2, almost certainly because HotSpot
> in-lines and specialises virtual calls so effectively.
>
> 3. We may use the method handles from VSJ 2 in invokedynamic call sites.
> The result is a little faster than Jython 2 in places, and significantly
> slower in others. However, there is scope for further optimisation.
>
> A longer version is here:
> https://the-very-slow-jython-project.readthedocs.io/en/latest/performance/_performance.html
>
> Jeff
>
> --
> Jeff Allen
>
>
>
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