Re: periodic daily takes a very long time to run (14-stable)

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 <mad@madpilot.net>