Re: Using ConTeXt-LMTX for modern Mathematically-Literate-Programming 1/2

From: Hans Hagen <j.hagen@xs4all.nl>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>,
	Stephen Gaito <stephen@perceptisys.co.uk>
Subject: Re: Using ConTeXt-LMTX for modern Mathematically-Literate-Programming 1/2
Date: Wed, 2 Dec 2020 14:04:18 +0100	[thread overview]
Message-ID: <3d6c8bcd-00dd-e734-dbad-b70f0fb177be@xs4all.nl> (raw)
In-Reply-To: <20201202094029.695ba8b1@nn01>

On 12/2/2020 10:40 AM, Stephen Gaito wrote:

> Many thanks for your swift and helpful comments.
> 
> After some *very crude* tests using the `luametatex` and `luametafun`
> documents, I find that while I *can* stop effective processing at
> various points in the LuaMetaTeX pipeline, the time difference overall
> is not really significant enough to bother with this approach.
> 
> The principle problem is, as you suggested below, "stopping" the
> pipeline at the PDF stage (using for example the `pre_output_filter`)
> corrupted the `*.tuc` data which is for my purposes, critical.
> 
> Your comment was:
> 
>> but keep in mind that multipass data is flushed as part of the
>> shipout (because it is often location and order bound)
> 
> For the record, using the `append_to_vlist_filter` callback, I did
> manage to drastically reduce the "pages" (which were all blank, not
> surprisingly).
> 
> However, on my elderly desktop from 2008, both callbacks essentially cut
> only 6-8 seconds out of 18 seconds, for the `luametatex` document, and
> 190 seconds, for the `luametafun` document.

hm, on my 2013 laptop the luametatex manual needs 10 sec (i have all the 
fonts, so that includes a bunch) and a metafun manual should do about 20

a test on am M1 mini needs half those times as reported yesterday

i bet that on a modern desktop the luatex manual will do < 5 sec

> In the case of the `luametafun` document, it is the MetaFun/MetaPost
> processing which, of course, is taking a long time (as it should, the
> graphics computations represent important but complex computations).

One run or many due to xref? Maybe your machine has no significant cpu 
cache? Do you run from disk or ssd? How much memory?

> My ultimate goal is to parallelize the production of large, heavily
> cross-referenced, ConTeXt documents... more on this in a future email...
Hans

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