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From: "Thomas A. Schmitz via ntg-context" <ntg-context@ntg.nl>
To: ntg-context@ntg.nl
Cc: "Thomas A. Schmitz" <thomas.schmitz@uni-bonn.de>
Subject: Something smells rotten in the state of luametatex...
Date: Fri, 8 Oct 2021 18:09:38 +0200	[thread overview]
Message-ID: <c247ca4f-ca8d-9dc7-3578-c10764ed4dd6@uni-bonn.de> (raw)


Hi all,

I have a document here for one of my classes: xml processed via context, 
some layers, some two column paragraphs, a bibliography, nothing out of 
the ordinary. With mkiv, it compiles cleanly:

mkiv lua stats  > used engine: luatex version: 1.13, functionality 
level: 7420, banner: this is luatex, version 1.13.0 (tex live 2021)
mkiv lua stats  > used hash slots: 48846 of 65536 + 250000
mkiv lua stats  > lua properties: engine: lua 5.3, used memory: 212 MB, 
ctx: 210 MB, max: unknown MB, hash chars: min(64,40), symbol mask: utf (τεχ)
mkiv lua stats  > runtime: 2.775 seconds, 119 processed pages, 119 
shipped pages, 42.883 pages/second
system          | total runtime: 5.996 seconds

When I compile the same document with luametatex, things slow down to a 
crawl:

mkiv lua stats  > used engine: luametatex version: 2.0921, functionality 
level: 20210903, format id: 594, compiler: gcc
mkiv lua stats  > tex properties: 740039 hash slots used of 2097152, 
48372 control sequences, approximate memory usage: 36 MB
mkiv lua stats  > lua properties: engine: lua 5.4, used memory: 100 MB, 
ctx: 93 MB, max: 138 MB, symbol mask: utf (τεχ)
mkiv lua stats  > runtime: 27.509 seconds, 119 processed pages, 119 
shipped pages, 4.326 pages/second
system          | total runtime: 139.458 seconds of 139.493 seconds

So, it takes more than 20 times as long... The CPU of my computer goes 
up to 100 %, and the entire machine sometimes becomes unresponsive 
during the run. Obviously, I can't provide a MWE, but this seems 
bizarre. One thing I see on my terminal: there are hundreds of lines 
like this

Overfull \hbox (0.8pt too wide) in paragraph at lines 18--18
6:17:  [glue][glue]<l2r par><l2r 
[glue][boundary][hlist][penalty][glue][hlist][penalty] >[glue][glue]

It's almost like some debug setting has been triggered. But that may be 
a red herring. Anyway, I just wanted to report this; maybe some bigger 
problem (with the binary or the format?) is lurking somewhere.

All best

Thomas
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             reply	other threads:[~2021-10-08 16:09 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-08 16:09 Thomas A. Schmitz via ntg-context [this message]
2021-10-08 17:58 ` Hans Hagen via ntg-context

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