On 8/15/2013 5:48 PM, Henning Hraban Ramm wrote:
Hi again,

in my current songbook project I use t-filter with LilyPond as shown in 
http://wiki.contextgarden.net/LilyPond with latest beta MkIV on OSX.

Every line (system) of notes is included as its own PDF to leave the page 
breaking to ConTeXt. But since I have some hundred songs with each a few lines, 
it sums up...

I guess ConTeXt keeps every externalfigure open, since I get this error:

pages           > flushing realpage 70, userpage 70
structure       > sectioning > TitelKlein @ level 2 : 0.83 -> Help Me See
GNU LilyPond 2.16.2
ERROR: In procedure open-file:
ERROR: Too many open files: 
LILYPOND        > name='lilytemp/prd_alle-temp-lilypond-c_helpmesee.pdf'
LILYPOND        > including system no.1
LILYPOND        > including system no.2
LILYPOND        > including system no.3
LILYPOND        > including system no.4
LILYPOND        > including system no.5
) (c_hochaufdem.tex 
</Users/hraban/workspace/liederheft/lilytemp/prd_alle-temp-lilypond-c_helpmesee-4.pdfI/O Error: 
Couldn't open file 
'/Users/hraban/workspace/liederheft/lilytemp/prd_alle-temp-lilypond-c_helpmesee-4.pdf': Too many 
open files.

!LuaTeX error: xpdf: reading PDF image failed
  ==> Fatal error occurred, no output PDF file produced!

It works with songbook excerpts (some 30 songs). I don't understand if the 
error is really from LilyPond or from LuaTeX (I guess the former), and how I 
would be able to increase the number of possible files (in bash on OSX 10.8.4). 
So probably it's more a general Unix question than a ConTeXt one, but anyway...

$ ulimit -n
$ sysctl kern.maxfiles
kern.maxfiles: 12288
$ sysctl kern.maxfilesperproc
kern.maxfilesperproc: 10240

$ ulimit -S -n 2048

(Properly describing a problem often helps to solve it. I send this for the 
records, in case someone runs into the same.)

afaik the limit for simultaneous open pdf files in luatex is 2K so it's indeed your operating system


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