> On Sep 19, 2016, at 04:18, René J.V. Bertin <rjvber...@gmail.com> wrote:
> 
> 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 suspect a change is at least part of it.  On 10.9, I see 
com.apple.IconServices that contain ISCacheTOC and *.iscachebmp files.  On 
10.10, I see com.apple.iconservices (notice the case difference) that contains 
a single store.index file, and there is a global 
/Library/Caches/com.apple.iconservices.store (which is 28 MB on my system).

> 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 caches.
> 
> R.
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