RE: [squid-users] High loads on linux box running squid - tuning

 
> Hi all,
>
> Im running squid on HP Proliant DL360 (3.06Ghz Xeon / 1Gb ram
> / 2x 15K disks in raid1)
>
> We have around 2000-2500 concurrent clients at daytimes
>
> We recently upgraded the squid box from 866Mhz PIII / 1Gb of
> ram. It had 100% cpu loads all the time and it was...slow :)
>
> After i upgraded the box to the 3Ghz Xeon its still
> performing pretty much the same (Loads from 0.80 to 2.00).
> Now i am running Squid 2.5.STABLE3-6.3E2 (from RHEL 3 Update
> 4). I am by no means a squid expert (go figure:) but here are
> the parameters i have changed from defaults (after googling
> for awile).
>
> cache_mem 128 MB
> cache_swap_low 80
> cache_swap_high 100
> maximum_object_size 1024 KB
> cache_dir aufs /var/spool/squid 4000 16 256 (i know i do not
> have alot of cacheing space, but this is a temp proxy solution)
> cache_store_log none
> request_body_max_size 12 MB
> half_closed_clients off
>
> The system is running 2.4.21-27 in non hyperthreading mode. (1 cpu)
>
> Is there anything i can do to quickly lower the load? How
> many users can one put on a box like this? I have been
> google-ing alot and have seen talk about 2500-5000 on one
> box, not unlike this one. Is this wrong?
>
 
  - Check whether the SQUID process has adequate mem. (not swapping) with :
        
        % free
        % top (check SIZE versus RSS of Squid process).

  - I would also advise to have a go with the default setting of 'cache_mem'
    see how that influences CPU usage.

  - From FAQ : http://www.squid-cache.org/Doc/FAQ/FAQ-11.html#ss11.46
    (Probably does not apply).

  M.
Received on Thu Feb 17 2005 - 01:56:10 MST