[luatex] LuaTeX precompilation

[luigi scarso]

On Fri, 22 Dec 2023 at 01:21, Reinhard Kotucha via luatex <luatex at tug.org>
wrote:

> On 2023-12-21 at 10:27:48 +0100, Hans Hagen wrote:
>
>  > I stop here as I've written plenty about performance the last
>  > decades in various docs,
>
> Hi Hans,
> please let me mention this though:
>
> A few months ago I uncompressed the lualatex format file and
> compressed it with lz4.  The lz4-compressed file was smaller than the
> original format file.  Though I know that luatex doesn't use maximum
> gzip compression, I didn't really expect this.
>
>  26702648  lualatex.fmt-uncompressed
>  12201683  lualatex.fmt
>   9926586  lualatex.fmt.lz4
>
> But what I absolutely didn't expect is that de-compression of lz4
> files is about 7.5 times as fast as de-compression of the gzip'ed
> format file.
>
> In order to determine speed I directed the de-compressed output to
> /dev/null because when writing to disk results differ much more
> between successive runs and a format file is extracted in memory and
> not written to disk.
>
> Maybe it's worthwhile to keep an eye on lz4.
>
>
Good to know.  A quick search, just for the record:
https://manishrjain.com/compression-algo-moving-data

But I think lz4 is better than zstd for a format.
--
luigi
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