DUAL CPU board vs 2 Single CPU boards: bang for buck?

Jim Fraser fraser5 at cox.net
Thu Mar 7 12:45:26 EST 2002


Amazing. 1 cpu 63 ps/day, 2 cpu = 179 ps/day, sounds like a case of  1 + 1 =
2.84   (ie. 63 + 63 = 179 (not 126)?)
Sounds fishy to me but I am unfamiliar with your application.
Jim

-----Original Message-----
From: beowulf-admin at beowulf.org [mailto:beowulf-admin at beowulf.org]On
Behalf Of Velocet
Sent: Thursday, March 07, 2002 11:00 AM
To: beowulf at beowulf.org
Subject: Re: DUAL CPU board vs 2 Single CPU boards: bang for buck?


On Thu, Mar 07, 2002 at 07:24:08AM -0500, Jim Fraser's all...
> I don't desire to start a flame but it seems to me that for computational
> intensive and memory intensive work that 2 singles are better and in most
> cases cheaper then a dual setup.  The dual SMP systems out there now have
to
> fight for bandwidth along the same bus.  The AMD chips while fast appear
to
> be starved for data when *big* memory jobs are running.  Further I don't
see
> the cost benefits, if you actually dig into the "bang-for-buck" duals
never
> seem to win.

Counter example:

d.dppc on gromacs 3.0 calculation on a dual tyan 2460 board:

1 cpu 63 ps/day
dual cpu 179 ps/day

cache, baby.

now, if only we could get 8 way athlons!

/kc

> The only significant benefit I see from dual is less hardware and higher
> computing density, that may be reason enough to go with duals esp. if your
> application does not require a lot of memory fetches.


>
> Jim Fraser
>
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--
Ken Chase, math at velocet.ca  *  Velocet Communications Inc.  *  Toronto,
CANADA
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