On 29/10/23 00:42, Guido Falsi wrote:
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.
Correcting myaelf:
The version we currently have in the ports tree (3.7.x) does not care
for atime, as far as I can see in the source code. It checks mtime only.
Newer versions do use it though!
--
Guido Falsi <[email protected]>
