[Beowulf] Three notes from ISC 2006

Vincent Diepeveen diep at xs4all.nl
Wed Jun 28 19:24:28 EDT 2006


Woodcrest totally destroys everything in terms of raw cpu performance.

Not only it clocks nearly 25% higher. According to junior team who used such 
a system
from HP (that's their normal sponsor) at world champs 2006 it was giving a 
20% higher ipc for their program too.

That's 50% faster than 2.4Ghz dual core opteron.

Only for those who need latency to the RAM above cpu performance,
A64-single core with 16GB RAM at each node will be more interesting.

That's not many applications.

Of course if you buy something *today* the dual core opteron is the 
preferred node,
as woodcrest isn't in the shop yet buyable.

If your software can work with gigabit ethernet then of course the price per 
node of an A64 dual core with cheap RAM
and a cheap mainboard could be more interesting than a faster node that's a 
little bit more expensive, using DDRII ram.

So the aspect of cost could be a concern.

At dual socket level however, the choice is simple. Woodcrest will outgun 
AMD in a big way.

Add to that that the new socket from intel is like 125 watts TDP. That's 
just not normal. That's wasting as much as itanium2!

Vincent

----- Original Message ----- 
From: "Kevin Ball" <kball at pathscale.com>
To: "Erik Paulson" <epaulson at cs.wisc.edu>
Cc: <beowulf at beowulf.org>; "Patrick Geoffray" <patrick at myri.com>
Sent: Wednesday, June 28, 2006 10:29 PM
Subject: Re: [Beowulf] Three notes from ISC 2006


> On Wed, 2006-06-28 at 13:41, Erik Paulson wrote:
>> On Wed, Jun 28, 2006 at 04:25:40PM -0400, Patrick Geoffray wrote:
>> >
>> > I just hope this will be picked up by an academic that can convince
>> > vendors to donate. Tax break is usually a good incentive for that :-)
>> >
>>
>> How much care should be given to the selection of the nodes? Performance
>> is a function of both the nodes and the interconnect - so while your
>> test cluster allows for direct comparisons of the interconnects it's only
>> for a cluster of AMD processors, or for Intel processors.
>
> Prior to Woodcrest, I would have said AMD 100%.  Now?  Its hard to say.
> I think AMD nodes will still tend to do better at scaling and show
> interconnects in a better light than Intel nodes, but Woodcrest
> performance looks like it may be good enough to at least make things
> competitive for all but the largest clusters.
>
>>
>> I could imagine there would be academic sites that would host this
>> thing, and possibly even spring for the nodes, provided that the
>> interconnects were donated and they got to use it when it's not in
>> use (and probably had some promise that no more than X% of the time
>> would the cluster be in "benchmark" mode)
>
> This is very possible... especially if the benchmarking results were
> interesting enough to pull some papers out of.
>
> -Kevin
>
>>
>> -Erik, not legally authorized to volunteer the University of Wisconsin to
>> host any such thing.
>
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