Re: ccache

On 4/3/23 18:48, Craig Leres wrote:
> On 4/3/23 17:09, Bakul Shah wrote:
>> Am I use ccache incorrectly or is there a bug?
>>
>> # CCACHE_DIR=/usr/obj/ccache ccache -s
>> cache directory                     /usr/obj/ccache
>> primary config                      /usr/obj/ccache/ccache.conf
>> secondary config      (readonly)    /usr/local/etc/ccache.conf
>> stats updated                       Mon Apr  3 16:54:31 2023
>> ...
>> cleanups performed                   507
>> files in cache                   2795230
>> cache size                           2.9 GB <===
>> max cache size                      15.0 GB
>> # find /usr/obj/ccache -type f |wc
>>   2795395 2795395 142222206
>> # du -sh /usr/obj/ccache
>>   83G    /usr/obj/ccache    <===
>>
>> I have
>>
>> WITH_CCACHE_BUILD=yes
>> CCACHE_DIR=/usr/obj/ccache
>>
>> in /etc/make.conf
> 
> Thank you for bringing this up; I have the same issue and have never 
> figured it out. But I think I've found another piece or two of the puzzle.
> 
> Using my favorite ktrace trick we can see that by default it tries to 
> open /usr/local/etc/ccache.conf:
> 
>      zinc 32 % cd /tmp && ktrace -di ccache -s > /dev/null
>      zinc 33 % kdump | fgrep NAMI | fgrep ccache.conf
>       17418 ccache   NAMI  "/usr/local/etc/ccache.conf"
>    17418 ccache   NAMI  "/home/zinc/u0/leres/.ccache/ccache.conf"
> 
> I suspect the trick here is when ccache runs inside a poudriere jail, 
> ccache.conf is not present and/or not in the right location.
> 
> On my build server I have /var/cache/ccache/ccache.conf which I believe 
> works for some things but I still have 46 GB in /var/cache/ccache and 
> /var/cache/ccache/ccache.conf is trying to limit use to 8 GB.
> 
> If I start up a poudriere jail and look around I find 
> /root/.ccache/ccache.conf is a copy of /var/cache/ccache/ccache.conf. So 
> I don't get why it doesn't work.
> 
> (Now I'll sit back and wait for something who knows more chimes in...)

Nobody stepped up and I haven't figured out how to make ccache obey 
max_size when run from inside the context of a poudriere jail but I do 
see now how to keep a lid on ccache disk usage.

I found that if I ran "ccache -c" as root, a .ccache directory would get 
created in /root. I could also see an attempt to open 
/usr/local/etc/ccache.conf so I created this with the following:

     cache_dir = /var/cache/ccache
     max_size = 8.0G

I then added a cron job to run this command at midnight:

     /usr/local/bin/ccache -c | fgrep -v 'Cleaned cache'

As the saying goes, "crude, but effective."

		Craig