RE: [squid-users] Squid - performance

Thanks.
What parameters define how much object size one should go for.
As per your suggestion I can go for 32mb for 30 GB cache dir.
I would like to understand how to derive this value?

Thanks for your support.

-----Original Message-----
From: Matus UHLAR - fantomas [mailto:uhlar@fantomas.sk]
Sent: Wednesday, August 17, 2005 10:15 AM
To: squid-users@squid-cache.org
Subject: Re: [squid-users] Squid - performance

On 16.08 21:25, lokesh.khanna@accelonafrica.com wrote:
> I am using 2 Scsi hard disk of 36 GB for cache. I have assigned only
15
> GB ( less than 50 % of total disk ) for cache in each disk .
> So total cache is 30 GB.
>
> cache_dir diskd /cache1/squid 15360 16 256 Q1=64 Q2=72
> cache_dir diskd /cache2/squid 15360 16 256 Q1=64 Q2=72
>
>
> I want to know if squid uses full 30 GB for cache then what will
happen?
> Shouldn't squid start deleting those cached objects which are not in
> use?
> Which parameter define that?

cache_swap_low and cache_swap_high define, when will squid start
removing
objects and how much will it remove. cache_replacement_policy defines,
how
will squid choose which objects to remove.

Note that for 36GB disks I have no problems defining cache_dir 30000
(the FS becomes filled up to ~86% which is OK)

> What parameters do I need to check to get best performance and
caching.

increase cache size for bigger efficiency, but not too big (filesystems
filled up too much use to have low performance).

> My squid is currently handling 80 req/sec and during peak hours nearly
> 1500 users uses caching server.
> I can save maximum 15 % to 18 % bandwidth. Is it possible to save more
> bandwidth with better performance??

yes, do the above, choose good replacement policy (heap LFUDA or heap
GSDF)
and increase maximum_object_size (for 2x36 GB I'd use 32 MB and maybe
more).

-- 
Matus UHLAR - fantomas, uhlar@fantomas.sk ; http://www.fantomas.sk/
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