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Bug#750785: Slowness with context and xetex



On 6/8/2014 9:26 AM, Norbert Preining wrote:
Hi Hans, hi Taco,

(please keep the Debian bug report in Cc)

We got a report here at Debian that context when run over xetex
is extremely slow, which I can confirm.

It is interesting that when I drop the original TeX Live (not Debian)
xetex into our /usr/bin, then it is getting fast again.

On the other hand, I don't see any slow down when running
xelatex on a similar document. The test document is a simple
	\starttext
	lots of lorem ipsum in paragraphs
	\stoptext
If I change this to a simple latex document {article} it is also
very fast.

So that points at something that context is telling xetex to do/load
that exhibits a bug, but I have *NO* idea where the bug might
come from.

Can you see if (in the background) the xetex font database gets regenerated? I remember that long ago on windows we had a problem with xetex, where it could not determine that it had already generated the database. This can happen when a font is asked for 'by name' which isn't on the system so that some kind of 'not found, let's regenerate the database' action happens (which is out of context control).

The difference between TL original and Debian is that we use
shared libraries. For pure text processing the fault should be
in harfbuzz, right? We are having 0.9.28.

Do you have any other ideas how to track such a bug? Do you have
any guess what could it be that context tells xetex?

Thanks a lot

Norbert

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PREINING, Norbert                               http://www.preining.info
JAIST, Japan                                 TeX Live & Debian Developer
GPG: 0x860CDC13   fp: F7D8 A928 26E3 16A1 9FA0  ACF0 6CAC A448 860C DC13
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