No subject

potentially starting to see problems...

FYI, not sure if it's of use to you... but... The digium tc400b is a
transcoder card that can offload upto 120 channels of transcoding for g729
<-> ulaw... It's available as PCI only, but, if that's OK, it could be an
alternative to replacing your server... G729 licenses are not needed when
using that card...

There have been posts by some people about having multiple CPU machines but
finding that asterisk's load wasn't spread over those CPUs very well... I'm
not sure if they had something special happening that caused their symptoms,
but, from your dual core machine you should be able to see whether or not
the load is already being spread across the 2 cores OK with your workload...

d

2009/3/27 Mike <list at virtutel.ca>

> 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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>
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