[mythtv-users] SMP Performance

devsk funtoos at yahoo.com
Sun Dec 10 18:12:23 UTC 2006

I think i have to disagree with John's evaluation. No single operation uses both cores but two different operations happening at the same time very well can. It boils down to prices on these things.

AMD Athlon 64 FX-55 San Diego 2.6GHz
AMD Athlon 64 X2 3800+ Windsor 2.0GHz

I think these are good comparison points because they are the same price on newegg. Now the question is whether to go for 30% more raw speed or to go for the slower dual core? Last year when I bought my X2, this was between a 2.4 single and 2.0 X2 and I went for X2, and I am happy I did that. For a mythtv system, I would still go for X2 because 30% clock gain is not really 30% performance gain, and with mythtv you are not really looking for performance gain as much as for multiple tasks happening at the same, a situation where dual core just rules ["theoretically" dual core/cpu is a 100% clock gain if the instruction pipeline is saturated and other conditions (like scheduler, cache conflicts) are perfect, but conditions are never perfect to achieve that in practice].

my 2 cents.

----- Original Message ----
From: John Drescher <drescherjm at gmail.com>
To: Discussion about mythtv <mythtv-users at mythtv.org>
Sent: Sunday, December 10, 2006 6:33:06 AM
Subject: Re: [mythtv-users] SMP Performance

On 12/9/06, Ho-Kuo Chan <hokuo.chan at gmail.com> wrote:
> Hi,
> I've searched the archives but can't find any information on MythTV
> running on SMP machines. Can anyone tell me if MythTV will take
> advantage of the SMP setup for building a time-slip capable PVR? (I
> guess that would also depend on the capture card drivers)? I have an
> ATI TV Wonder PCI.
If you are not using HD (and do not plan to in the near future) you
will be better off using a faster single core processor over two
slower cores as most operations in myth do not make use of the second
core. Mytharchive, commercial flagging, mythtranscode ... do not use
more than one core on a single video but you can sometimes execute
more than one instance of some of these in parallel as long as they
are working on a different video.

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