[asterisk-users] Asterisk multi-cpu

[Mike]

Thanks that`s great info, and I've already subscribed to the HA mailing
list.  

I understand call handling takes little CPU, but half my calls are
transcoded from ulaw to g729 and vice versa.  That seems to take my single
CPU, dual-core 2.5Ghz machine up to ~35% CPU utilization.  I imagine
doubling what happens on my server would take me dangerously close to the
upper limit of good call quality.

Am I complete off?

Mike

> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-
> bounces at lists.digium.com] On Behalf Of David Backeberg
> Sent: Thursday, March 26, 2009 18:40
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [asterisk-users] Asterisk multi-cpu
> 
> On Thu, Mar 26, 2009 at 3:06 PM, Mike <list at virtutel.ca> wrote:
> > Hi,
> >
> > I know somebody is going to give me the link to the wiki hardware pages,
> but
> > I can't find the answer there. I'd like to know if, for an Asterisk only
> > system (nothing else of note running on it), I get a real gain from
> having 2
> > CPUs.
> >
> > Does the amount of traffic/SIP registrations/codec translation possible
> > doubles with 2 CPUs? (each quad core E5420 to be precise)? Does it
> increase
> > by 50%?  It is only a marginal increase, or none at all?
> 
> You don't say anything about your possible kind of usage, so it's
> difficult to provide any specific answer to your question. In general,
> a few things are true:
> * asterisk is multi-threaded
> * linux kernel has nice job schedulers and i/o schedulers
> * if you have more ram, more things will get cached in ram
> * if you have more cpus / cores you can do more things at once as long
> as they aren't all idle waiting for some resource constraint
> 
> You need to run a LOT of traffic through a server if it's just
> straight call handling, with a minimum of disk-bound i/o or
> transcoding, before you're going to max out modern hardware. So just
> buy the best server you want to buy, but save some money for a good
> warranty, or buy two servers if that's cheaper than what it would cost
> to be down.
> 
> If you want more in-depth discussions on this you probably would
> prefer the asterisk-ha-clustering list:
> http://lists.digium.com/mailman/listinfo/asterisk-ha-clustering
> 
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