[squid-users] Squid 3.5.21 - High CPU (100%)

[Amos Jeffries]

On 27/09/2016 3:22 a.m., Jasper Van Der Westhuizen wrote:
> 
> Is there anything that you guys can suggest I do around the cache? 
> Should I try a different store type? A different filesystem type
> perhaps?
> 
> 
> 
> If your store has a configuration knob that effectively limits disk 
> writing rate, then use it to limit that rate to avoid overflowing the
> queue.
> 
> You can also consider using rock store that has an explicit write
> rate limiting option (but comes with other problems that may or may
> not affect your setup).
> 
> Adding more physical disk spindles helps, of course.
> 

Just to be clear since you mentioned working with virtual services. By
"spindle" Alex refers to individual physical HDD devices underneath the
whole VM storage setup. 'Disk' a the VM level, even at the RAID level
might refer to multiple or overlapping (shared) 'spindles'.

Unless your AUFS/UFS/diskd cache_dir are limited to being on one
"spindle" HDD, they can cause a shared HDD controller to fill up /
overload and adding more cache_dir just makes that particular problem worse.

Amos