luajit | featured | |
---|---|---|
1 | 163 | |
540 | - | |
- | - | |
10.0 | - | |
over 4 years ago | - | |
C | ||
GNU General Public License v3.0 or later | - |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
luajit
-
Back-end languages are coming to the front-end
> No offence, but have you written any compilers or interpreters?
I have, but nothing sophisticated.
> The points that you discuss [...] may be performance concerns for application developers [...] but they have very little to do with the optimisations you can make as a compiler/interpreter writer. [...] The only one that's somewhat relevant is 'global scope by default'
I didn't mean to imply that these where the three common traits that make both Javascript and Lua particularly hard to optimize, I just picked them as examples for how Javascript and Lua are closer to each other than most other dynamic languages.
But let's dig in a bit on your claim that things like all numbers being doubles or having a array cum map cum record type has very little to do with the optimizations you can make as a compiler/interpreter writer, because it sure seems to me that LuaJIT and V8 do a bunch of optimizations around these things. Both have dual number representations under the hood and will try to avoid representing numbers that remain in the domain of 32 bit integers as double values internally when that gives performance gains. The logic for figuring out if that's the case doesn't seem to be super-straightforward or target architecture independent from looking at the comments in <https://github.com/LuaDist/luajit/blob/master/src/lj_opt_nar...>.
LuaJIT furthermore uses NaN tagging (as do some JS engines, although not V8), which looks less attractive to me as a representation strategy if your numbers are not all/mostly notional doubles (as is indeed the case in newer version of Lua where 64bit integers are the dominant number type)
Also, as far as the super-flexible lua tables are concerned, I'm pretty sure LuaJIT goes through some amount of trouble to specialize various common use cases of tables, e.g. as arrays without holes, and surprise, so does V8 (https://v8.dev/blog/fast-properties#elements-or-array-indexe...). I don't think you'd find something equivalent in a high performance scheme implementation.
> but this doesn't touch the surface of the issues that make JS hard to optimise, such as the fact that your, say, memoisation of an object property or method may be broken by an `eval` call of an arbitrary runtime value somewhere else in the code (which, due to asynchronicity, could take place at more or less any time from the point of view of your given 'peephole').
Eval belongs to a core set of features that basically all popular dynamic languages share that presents headaches for high performance implementations. How is Javascript's eval particularly problematic in this regard, and specifically much more so than Lua's loadstring/load?
More generally what do you think makes (pre-ES6) javascript significantly harder to optimize than lua 5.0?
featured
- Non-code contributions are the secret to open source success
-
Why are there open source projects of big tech companies that don't like community contributions?
I recommend reading https://github.com/readme/featured/how-open-is-open-source to understand some of the maintainers perspective.
- Is Laravel the happiest developer community on the planet?
- TypeScript and the dawn of gradual types
- Coding accessibility: Building autonomy with AI
- How โopenโ should your open source be?
- Methodus Toolz
What are some alternatives?
wasmer-python - ๐๐ธ WebAssembly runtime for Python
KeyDB - A Multithreaded Fork of Redis
diode - Scala library for managing immutable application model
phpmon - Lightweight, native Mac menu bar app that helps you manage multiple PHP installations, locate config files and more. Also interacts with Laravel Valet.
htmx - </> htmx - high power tools for HTML
upscheme - Database migrations and schema updates made easy
mumba - Write web-native p2p distributed apps in Swift (and others)
phantomuserland - Phantom: Persistent Operating System
reactor - Phoenix LiveView but for Django
trivy-action - Runs Trivy as GitHub action to scan your Docker container image for vulnerabilities
django-unicorn - The magical reactive component framework for Django โจ
viewi - Unique and efficient front-end framework for PHP