[Linux-ia64] Itanium gets supercomputing software
duraid at octopus.com.au
Mon Apr 14 19:23:26 EDT 2003
Craig Tierney wrote:
> On Mon, 2003-04-14 at 14:18, Duraid Madina wrote:
>>Mikhail Kuzminsky wrote:
>>> Taking into account that Itanium 2 has much more high performance,
>>>the price from HP looks reasonable.
>>On FP-heavy workloads, perhaps. On integer workloads, hardly. And that's
>>only comparing it against HP's own PA-8700 hardware! Compare it to more
>>mainstream hardware and you'll see just how laughable Itanium 2 prices
>>are. The Itanium 2 doesn't have significantly higher performance than
>>today's Xeons. Opteron, at least for the time being, performs
>>significantly better again.
> Er, really? What are your comparisons?
> My comparisons show that
> Itanium 2's operate about 100% faster on my codes than my 2.2 Ghz Xeons
> (400 Mhz FSB).
> This is without going in and trying to tweak the code.
> I don't know if it is running as fast as it should be.
Why am I not surprised.
> No, this still doesn't justify the price difference, but the performance
> isn't as bad as you are implying.
I was mistaken. Since Itanium 2 is in the habit of routinely performing
integer codes at double the speed of 2.2GHz Xeons, it's
> The I2 does have integer math performance problems, but is supposed to
> be corrected with the next generation chip (Madison).
Madison will be called Itanium 2, and for good reason. Isn't it an
Itanium 2, respun on a 130nm process and with (potentially) more cache?
If there are any other differences, I'd be grateful if you could tell me
about those. As far as I can see, this year's ISSCC papers still aren't
> Unless we want start a flame war on NDA hardware, I think should be
> adding the phrase 'It depends' to any Opteron benchmarks, because it
> does. Lets get to arguing numbers in about 2 weeks when we can.
One week to go! ;)
> And no, for MY CODES, Opteron does not perform significantly better than
> the Itanium 2 in all cases.
Does your code fit in cache? I can't think of any other reason why you'd
perform so badly on an Opteron. Which stepping of Opteron have you been
> However, when we start to talk
> price/performance the Opteron will be the right choice for many
> applications. However, not necessarily all of them.
Nope, just most of them.
> I am not trying to be negative about a platform that does not exist
I am trying to be negative about a platform that is overpriced. ;)
> Personally I want 8 to 1000 Opteron nodes to do some real work.
Personally, I want two Itanium 2s to stick under my desk. But I can't
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