Re: periodic daily takes a very long time to run (14-stable)
Date: Sat, 28 Oct 2023 22:42:14 UTC
On 29/10/23 00:33, void wrote: > On Fri, Oct 27, 2023 at 05:38:58PM +0200, Guido Falsi wrote: >> I have this for ccache FS (zfs): >> >> dumpster/ccache atime on local > > I wondered why you have this set to 'on'? > > I mean I know /var/mail needs it for mail to function. Is it the same > wiht ccache ? > I used to have it off, but recently I turned it on. I have not really properly checked, but I have an hunch that ccache is using atime to decide which files to properly clean up the cache (LRU logic). With atime - off you get atime = mtime, which is not the best option for LRU logic. You want objects to be counted as "hot" if they were created/modified a long time ago, but used yesterday. Recent manual page does talk about atime, also a quick search in the sources reference atime multiple times. So it IS using it. To be on the safe side, I've added this, but as I said I did this recently so I still don't know if it is really helping. -- Guido Falsi <mad@madpilot.net>