LuaTeX + babel + lots of languages -> 10GB of RAM

Scott Kostyshak <[email protected]> Fri, 18 Jul 2025 11:29:23 +0200

Newsgroups	gmane.comp.tex.texhax
Message-ID	<xpyquj6ljsvsidshsoiej3yqoifajkm6po2q3ztlminrkqpmxn@nqqillqeeull>

Dear all,

I've come across an issue of large RAM usage while running some
automated tests.

The RAM usage is proportional to the document, which makes it difficult
to make an MWE. Here is a long document:

https://www.dropbox.com/scl/fi/s1hs1l9ac73p83tr4achm/babel-lualatex-large-ram.tex?rlkey=z8hhz888vux3jf366uxebjo05&dl=1

When I run "lualatex" on it or "dvilualatex", it uses about 10GB of RAM
for me (and the compilation does succeed with a zero error code).

If you try to reproduce, please be careful on your system if you do not
have a lot of RAM available because it might make your system run out of
RAM and depending on your OS and setting, could grind it to a halt.
(on my system, it just automatically kills the offending task if there's
not enough RAM available, but it may be different for you)

Any advice on whether this is a bug? If so, should it be reported to
LuaTeX? Babel?

Note that this document isn't mine and I'm not looking for a work
around, I just want to know if there is a bug that I should report
somewhere. I will be happy to forget about this "issue" if there's
nothing interesting to report.

Thanks,
Scott

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