Linked by Thom Holwerda on Tue 22nd Sep 2009 21:20 UTC
Intel More than a decade ago, Intel ran into an issue trying to deliver what was to be the world's top-ranked supercomputer: it looked possible that its new Pentium Pro processors at the heart of the system might not arrive in time. As a result, the chipmaker made an unusual move by paying Hewlett-Packard $100,000 to evaluate building the system using its PA-RISC processors in the machine, said Paul Prince, now Dell's chief technology officer for enterprise products but then Intel's system architect for the supercomputer. Called ASCI Red and housed at Sandia National Laboratories, it was designed to be the first supercomputer to cross the threshold of a trillion math calculations per second.
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Comment by kaiwai
by kaiwai on Wed 23rd Sep 2009 01:55 UTC
kaiwai
Member since:
2005-07-06

Given what a lemon Itanium is; the original aim was for it to become a general purpose processor to replace Xeon so that it could compete with the UNIX world, I wonder whether PA-RISC would have been a better architecture to go for instead of Itanium.

I also wonder what it would have been like if Intel sprinkled PA-RISC with its power saving magic and what it would be like in a laptop ;)

Reply Score: 3

RE: Comment by kaiwai
by neticspace on Wed 23rd Sep 2009 02:34 in reply to "Comment by kaiwai"
neticspace Member since:
2009-06-09

Given what a lemon Itanium is; the original aim was for it to become a general purpose processor to replace Xeon so that it could compete with the UNIX world, I wonder whether PA-RISC would have been a better architecture to go for instead of Itanium.

I also wonder what it would have been like if Intel sprinkled PA-RISC with its power saving magic and what it would be like in a laptop ;)


Just a simple question. What is the exact relationship between Itanium and PA-RISC?

Reply Parent Score: 1

RE[2]: Comment by kaiwai
by kaiwai on Wed 23rd Sep 2009 03:23 in reply to "RE: Comment by kaiwai"
kaiwai Member since:
2005-07-06

Just a simple question. What is the exact relationship between Itanium and PA-RISC?


Itanium started off initially as a project by HP as a successor to PA-RISC, hence, there is from the start the design of a compatibility layer so that people can run PA-RISC binaries on Itanium unmodified.

The problem with Itanium is that it placed far too much hope in the skill of compiler engineers to create a compiler that can handle all the things which HP thought should be pushed back as a matter of software compiling rather than at runtime. The net result has been what we've seen today a lacklustre CPU performance which seems to be more of a by-product of university theory rather than business practicality.

Btw, this isn't the first time a VLIW-like processor has been attempted; its one of those ideas that came out of the engineering academia when it should have stayed there. Nice on the blackboard when teaching kids but reality is that it throws out reality in favour of the perfect set of scenarios.

Reply Parent Score: 3

RE: Comment by kaiwai
by zlynx on Wed 23rd Sep 2009 04:43 in reply to "Comment by kaiwai"
zlynx Member since:
2005-07-20

I have to wonder if people who call Itanium a "lemon" and "Itanic" have ever used one.

I do think that Intel didn't get the success they planned on. But it is a good processor.

I have a dual processor Itanium2 1.4GHz (Celestica off eBay) that produces roughly the same speed results as a 2GHz dual Opteron when I compile my software with GCC 4.4 with profiling feedback.

That's pretty good for a 600 MHz speed difference.

Itanium has other neat features, like not using the stack for function call returns. And things like a large selection of jumbo and giant page sizes.

Reply Parent Score: 3

RE[2]: Comment by kaiwai
by JAlexoid on Wed 23rd Sep 2009 09:16 in reply to "RE: Comment by kaiwai"
JAlexoid Member since:
2009-05-19

There is not just the only one generation of Opterons, you know. Witch one were you benchmarking against.

Reply Parent Score: 1

RE[2]: Comment by kaiwai
by bannor99 on Wed 23rd Sep 2009 10:59 in reply to "RE: Comment by kaiwai"
bannor99 Member since:
2005-09-15

I have to wonder if people who call Itanium a "lemon" and "Itanic" have ever used one.

I do think that Intel didn't get the success they planned on. But it is a good processor.

I have a dual processor Itanium2 1.4GHz (Celestica off eBay) that produces roughly the same speed results as a 2GHz dual Opteron when I compile my software with GCC 4.4 with profiling feedback.

That's pretty good for a 600 MHz speed difference.

Itanium has other neat features, like not using the stack for function call returns. And things like a large selection of jumbo and giant page sizes.


First off, you're not using the "Itanic", you have the second generation. You're also using an up to date compiler - after all, the whole idea of the Itanium / EPIC arch was that the smarts would be in the compiler.

Based on your description, your Itanium2 could be as old as 2003 or as new as 2006. The Opterons have had such a wide clockspeed range that I can't tell how old they would be.
Let's assume that both your Opterons and Itaniums date to 2004; now answer these questions, what was the price differential? How about typical power dissipation? What was the performance of software using the compilers ( free or otherwise ) available at the time? If commercial compilers were used, how expensive were they?

Another thing to consider is that the original Itanium was supposed to deliver decent IA-32 performance - and it didn't, even though there was hardware emulation.

So the question remains, how could Intel and HP screw up so badly? It also opened the door for AMD to take the lead on Intel's own architecture. If AMD had had more fabrication plants and better manufacturing processes, Chipzilla might have gone the way of the dinosaur.

Reply Parent Score: 3

RE[2]: Comment by kaiwai
by asdf on Wed 23rd Sep 2009 14:55 in reply to "RE: Comment by kaiwai"
asdf Member since:
2009-09-23

Clock speed is just one parameter (think about the P4s and how they achieved very high clock speed by shortening each pipeline stage). Have you compared the transistor count, memory bandwidth and process technology used? Itaniums have only been competitive because they poured resources into it - large cache, high memory bandwidth and so on. I've heard recent ones are pretty good but I doubt even the yet-to-come Tukwila would surpass Nehalems by much, well, if at all. If you factor in the overall cost, it just doesn't make much sense unless you're talking about highend niche.

Edited 2009-09-23 14:56 UTC

Reply Parent Score: 1

RE[2]: Comment by kaiwai
by sbergman27 on Thu 24th Sep 2009 06:03 in reply to "RE: Comment by kaiwai"
sbergman27 Member since:
2005-07-24

I have to wonder if people who call Itanium a "lemon" and "Itanic" have ever used one.

Well, that was the problem, wasn't it? The Titanic wasn't a bad ship. It hit an iceberg and sank. The Itanic also hit an iceberg and sank. The difference being that plenty of people saw the iceberg that Itanic was heading for, and Intel still just plowed into it.

Maybe compilers today do have the smarts necessary to have averted that collision years ago. And maybe modern technology could have averted Titanic's own collision. (For that matter, 1912 technology could have done so, if only <fill in the blank>. But does it really matter today?

Reply Parent Score: 2