Processing Power

[Per Buer]

Hi Simon,

With regards to CPU, Varnish doesn't need that much. Typically, you'll have
maybe 5 or 10% CPU utilisation on a modern machine running at 5000 requests
a second.

The memory is completely dependent on the site you are about to cache. Most
websites are pretty small in terms of content size so 96GB should be more
than sufficient to keep most of the website in memory, unless you have
video content. Even then, 96GB is quite a lot.

The bans will add a bit of CPU use to Varnish and might induce a bit of
latency if you'll have a lot of them. The CPU usage is a factor of (no of
bans) x number of objects in cache as every ban will have to be matched
against every object in cache. CPUs are fast, so this might not be as bad
as it sounds.

Per.



On Mon, Jan 27, 2014 at 12:45 PM, Simon Lennon, OnCommerce Ltd. <
simon.lennon at oncommerce.co.uk> wrote:

>  Hi guys, I was wondering what kind of processing power varnish needs. I
> am setting up a dedicated environment with a custom built VCL which
> includes some regexp and the load balancing functionality.
>
> I was going to setup a dual core server with 96GB of ram, is this enough
> for a HIGH traffic site, says 10,000 hits a second with very high cache
> utilization?
>
> I will also be using the ban list to achieve a very high level of caching,
> with a daily restart to flush the archive, but I would expect several
> hundred regex patterns per day in the ban list.
>
> I know varnish is optimized for performance so I wasn't sure how much
> processing power it would need,
>
> thanks,
> --
>
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-- 
 <http://www.varnish-software.com/> *Per Buer*
CTO | Varnish Software
Phone: +47 958 39 117 | Skype: per.buer
We Make Websites Fly!

Winner of the Red Herring Top 100 Global Award 2013
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