New subject: About the font_max limitation for vf_nf

22 Nov 2006

      Hi,

I took a closer look at the problem. vf_nf grows very fast
because vf_nf = <number of vf fonts> * <number of tfm in each vf>
We cannot reduce this, because the number of tfm inside a vf
(let's call it the local tfm) is used to render the
characters inside a vf. Hence pdftex must remember all
local for all vf, which is the above number.

However it seems reasonable to allow the limit to be much
higher than font_max. I will submit a patch soon.

Thanh

On Wed, Nov 22, 2006 at 09:44:10PM +0800, Jie Luo wrote:
...
Hi,
There is a GB.tex in the test.tar.bz2 which is a modification of GB.tex
in CJK package. This file can be compiled with TeXLive. When processing
this file with pdflatex, the vf_nf value reaches 1978 which is close to
the present font_max ( = 2000 ). I also attach the log files of another
two tex documents, hope to be helpful.
Thanks,
Jie
Thanh Han The wrote:
...
Hi,
can you please send me a minimal test file so I can
reproduce the problem? It is best to use fonts that are
available in TeXLive so I can compile it.
Thanks,
Thanh
On Wed, Nov 22, 2006 at 05:38:35PM +0800, Jie Luo wrote:
...
Hi Thanh,
Thanh Han The wrote:
...
Hi,
I don't know whether this is a bug or not, unless I can
reproduce the behaviour. You can verify by checking how many
tfm fonts are opened by pdftex. If the total number of tfm
fonts is much less than vf_nf, then it's likely a bug.
However there are a few things to consider:
- tex (and hence pdftex) loads the same tfm for different
sizes, ef \font\f=cmr10 and  \font\f=cmr10 at 12pt will
load the tfm twice.
- the same applies for vf. In the above example, if cmr10 is
a virtual font containing 2 tfm, the number of loaded
fonts will be 4. So you get the idea how quick it grows.
You can use the script I attached to see which fonts have
been opened during a tex run. Usage:
,--------
| list-tex-files pdftex foo.tex
`--------
It will run pdftex and saves the list of opened files into a
temporary file.
HTH,
Thanh
I did some tests using this script.
GB.tex
vf_nf = 3114
opened tfm files with pdflatex = 408
opened tfm files with latex = 59
book.tex
vf_nf = 11834
opened tfm files with pdflatex = 1075
opened tfm files with latex = 364
So it seems that the vf_nf is about 10 times of the opened tfm files,
this maybe a bug. By the way, I do not have the list-tex-files.vim file,
is this a problem?
Thanks,
Jie
...
On Wed, Nov 22, 2006 at 01:12:56PM +0800, Jie Luo wrote:
...
Hi Thanh,
When using pdflatex to processing tex documents contain more than two
Chinese GBK virtual fonts, pdflatex always failed with a divide by zero
error. I read the mail archive of pdftex list and find it said to be
related to the font_max limitation. I add some statement to debug this,
and find that the vf_nf value is about 2300 when using two Chinese GBK
virtual fonts. But when I use pdflatex to compile a book with about 250
pages, the value of vf_nf is about 12000 with less than 100 type1 fonts
embedded in the pdf file. Is there any problem with the vf_nf? Or it is
the expected value.
Jie
------------------------------------------------------------------------
#!/bin/sh
if test "x$1" = x; then
   echo Usage: "$0 <tex command>"
   echo Example: "$0 latex myfile"
   exit 1
fi
export KPATHSEA_DEBUG=4
f=/tmp/kpof.$$.1
$* 2>$f
vim -S ~/vim/list-tex-files.vim $f
echo "List of opened files saved to $f"

Re: [NTG-pdftex] About the font_max limitation for vf_nf

Thanh Han The

Jie Luo

Frank Küster

Jie Luo

Frank Küster

Frank Küster

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