On Monday September 19 2016 03:46:32 Jeremy Huddleston Sequoia wrote:

> > TMPDIR points into /var/folders.
> Yes, and it looks like those do get cleared out on boot.
> Note, however, that this particular case relates to the cache dir, not tmp 
> (C, not T).

Oh, right, but there are icon caches in both C and T dirs:

%> sudo sh -c "du -hcs /var/folders/*/*/*/com.apple.IconServices"
 81M    /var/folders/11/_bf842l54ngf42g66hkzslmw0000gp/C/com.apple.IconServices
264K    /var/folders/11/_bf842l54ngf42g66hkzslmw0000gp/T/com.apple.IconServices
 82M    /var/folders/99/yvy25dd94jn_ykbfkf1q4mzw0000gw/C/com.apple.IconServices
 88M    /var/folders/gf/wmgp2zv506dcsg7_cjxx69m40000gr/C/com.apple.IconServices
234M    /var/folders/j1/1439ppj08xj8h6006s6drbq00000gs/C/com.apple.IconServices
 11M    /var/folders/j1/1439ppj08xj8h6006s6drbq00000gs/T/com.apple.IconServices
 80M    /var/folders/sd/pwbxpphw8xj3vb006s6drbq00000gn/C/com.apple.IconServices
264K    /var/folders/sd/pwbxpphw8xj3vb006s6drbq00000gn/T/com.apple.IconServices
 12K    /var/folders/zz/zyxvpxvq6csfxvn_n0000000000000/C/com.apple.IconServices
  0B    /var/folders/zz/zyxvpxvq6csfxvn_n0000000000000/T/com.apple.IconServices
 12K    /var/folders/zz/zyxvpxvq6csfxvn_n00000bh00002w/C/com.apple.IconServices
  0B    /var/folders/zz/zyxvpxvq6csfxvn_n00000bh00002w/T/com.apple.IconServices
577M    total

Those are compressed sizes; uncompressed they take about 5.5Gb .

> > How large is your own icon cache directory? And asking here is me 
> > investigating. I wouldn't really know where else to ask, Apple's 
> > support/discussions forum? Doesn't seem like the most appropriate place to 
> > discuss this kind of thing :)
> 6 MB for me.  1MB each for two others.

Right, looks like something isn't right - or something was changed 
significantly since 10.9. 

I do have a 277Mb large /opt/local/share/icons, but those shouldn't be picked 
up by Apple's IconServices (only a few icon theme directories have ever been 
opened in the Finder, and only by me, not any of the other users with big icon 

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