[asterisk-users] Asterisk multi-cpu

[David fire]

hi
for  800  you can have a complete core 2 quad server you should have many
servers and make an asterisk cluster instead of one super server.
David

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

>  Thanks.  I am "forced" to change servers anyways, so I'm starting from
> scratch, which gives me the benefit of allowing me to plan things exactly as
> I want them.
>
>
>
> I was hoping to avoid the TC400B until the server itself was almost under
> strain, at which point I`d put one (or two) of those in to relieve it.  But
> what I really wanted to know if whether I'd go with a single quad-core or
> two.  Two isn't that much more expensive (not if it makes Asterisk process
> twice as much stuff) but if it doesn't add anything, I'd rather avoid this
> extra ~800$ per server.
>
>
>
> As for my specific needs: I am adding users/transcoded channels to this
> server regularly, so I do see it being not powerful enough eventually.
> That's why I am planning without giving any hard values: the most powerful
> (for the buck) the better it is.
>
>
>
> Mike
>
>
>
>
>
>
>
> *From:* asterisk-users-bounces at lists.digium.com [mailto:
> asterisk-users-bounces at lists.digium.com] *On Behalf Of *D Tucny
> *Sent:* Friday, March 27, 2009 0:42
>
> *To:* Asterisk Users Mailing List - Non-Commercial Discussion
> *Subject:* Re: [asterisk-users] Asterisk multi-cpu
>
>
>
> From your figures, it would appear that if you double the load you will be
> 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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