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[Dvipng] sleeping --follow

From: Benito van der Zander
Subject: [Dvipng] sleeping --follow
Date: Thu, 31 May 2012 19:14:12 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0.4) Gecko/20120510 Icedove/10.0.4

reading the documentation you would think that you can use the --follow option to speed up a tex->png conversion,
because you can run latex and dvipng in parallel.
Unfortunately, it becomes much slower, because for most small documents latex runs in less than a second, but
dvipng sleeps for 1s, if the dvi-file is not complete.

So, I suggest that it does something like this:

1. for the first 16 ms, dvipng shouldn't sleep at all, but try to read continuously from the file

2. afterwards sleep for 1 ms, then for 4 ms, 9, 16, ... up to a maximum of 1024 ms

3. once a character has been read and processed, it should go back to step 1, if the file is still not complete.


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