Akira TAGOH wrote:
That also works but we need to support the parallel updates on
fc-cache by threading then. otherwise it's quite stressful to wait
for. but it may takes more time if the directory structure where is
updating is too deep, because there are no way to know how many sub
directories it contains until a cache is updated. so just updating
twice seems realistic at this moment. this may be a todo task for
future improvement.
I don't think scanning the directory tree in the font dir
is a problem. On a tree with 35,632 paths (27066 uniq inodes before
deduplication), (this is my "/usr/share/fonts" dir, BTW), it took
an app(my dedup script in perl) ~8s to walk my font-dir tree
w/a cold cache.
Have you thought about using async I/O... maybe w/an event loop?
find took 4.2s to go through my /usr/share/fonts on a cold cache.
an async tree scan w/cold cache took took about 2.0s..
(FWIW, if timing, I run this dropcaches function):
function dropcaches() {
echo -n "3"|sudo dd of=/proc/sys/vm/drop_caches
}
I just reran my dedup script on the fontdir (hardlinks dup files) so
it could be faster... but I don't think fontconfig checks the
inode#'s to see if there are dups to skip reading?
Does it?
For dedup to walk /usr/share/fonts and find dups:
Ishtar:/usr/share/fonts> time dedup .
Paths: 35632, uniq nodes: 27066, total_size: 11.4GB (11.6GB allocated).
Explore & Sort finished at 9.403s <<<<<<<<<<<<----(7.924s for walk+sort)
Creating HoSSL finished at 1.479s
Finished w/20189 nodes & 7.7GB space (6877 new
links)
3.9GB in 6880 duplicate files found in 104.63 seconds. (114.04s total)
114.33sec 31.51usr 14.56sys (40.30% cpu)
In comparison, font-config rebuilding that
cache takes over ***14 minutes*** of cpu time (I didn't have a
wall clock running on it; so just read the cpu), but it was
at least 14 minutes, guaranteed (while dedup was only 40% cpu
bound, it is mostly cpu bound).
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