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[YT] AMD FX Bulldozer @ 6.5 GHz - under LN2 - Page 11

post #101 of 116
Quote:
Originally Posted by StarDestroyer View Post
what is the siperpi soccccccccccccccccccccccre
Score?

We don't know.

But what we do know is that it's not useful in determining real-life or vs. Intel performance in any way shape or form.

Ergo... It doesn't matter.
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post #102 of 116
Quote:
Originally Posted by Fr0sty View Post
at this moment no better sources exist ..


and dont worry about the Epic Fail moment .. we all have one every once in a while
at least once a day
post #103 of 116
that video was a piece of failure.
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post #104 of 116
Quote:
Originally Posted by JCPUser View Post
That is NOT the reason. It favors Intel because SPi uses an outdated, rather obsolete instruction set called x87. x87 has basically been replaced by SSE (and it variants) in modern applications. However, Intel still uses x87 on their CPUs wheras AMD just emulates it... this is the main reason why SPi is faster on Intel processors.
That's not correct. Scientific computing sometimes needs the additional accuracy of a 64bit mantissa and even in real world code as used in our company there can be situations where it is difficult to maintain enough accuracy due to bit cancellation problems.

And thus x87 is executed in HW on Bulldozer. One half of the register files is able to store full x87 mapped registers and at least the lower halves of the two 128b FMAC units execute x87 mul/add type ops. Emulation with narrower FP hardware would cause performance to drop <25% at least.

Have a look at Hiroshige Goto's diagram:

http://pc.watch.impress.co.jp/img/pc...tml/9.jpg.html
x87 == EP (extended precision)

As someone at XS pointed out, SuperPi might suffer from bad use of caches and memory, maybe also of decode hardware, since it's been compiled for some old arch (Pentium?), which had much different needs for code optimization than newer archs.
For other possible explainations of performance behaviour have a look at my latest blog entry: http://citavia.blog.de/2011/08/28/bu...mmit-11338315/
post #105 of 116
Quote:
Originally Posted by Dresdenboy View Post
That's not correct. Scientific computing sometimes needs the additional accuracy of a 64bit mantissa and even in real world code as used in our company there can be situations where it is difficult to maintain enough accuracy due to bit cancellation problems.

And thus x87 is executed in HW on Bulldozer. One half of the register files is able to store full x87 mapped registers and at least the lower halves of the two 128b FMAC units execute x87 mul/add type ops. Emulation with narrower FP hardware would cause performance to drop <25% at least.

Have a look at Hiroshige Goto's diagram:

http://pc.watch.impress.co.jp/img/pc...tml/9.jpg.html
x87 == EP (extended precision)

As someone at XS pointed out, SuperPi might suffer from bad use of caches and memory, maybe also of decode hardware, since it's been compiled for some old arch (Pentium?), which had much different needs for code optimization than newer archs.
For other possible explainations of performance behaviour have a look at my latest blog entry: http://citavia.blog.de/2011/08/28/bu...mmit-11338315/
OK. You clearly know more than I do... however, leaving bulldozer ES chips aside for a moment why do current AMD processors perform far worse compared to Intel in super pi than in other single threaded benchmarks? If it is just about SPi not being optimized for new archs then Intel should suffer similar performance losses.
Edited by JCPUser - 9/2/11 at 12:52am
post #106 of 116
More fake OBR crap.

The fact that this thread is 11 pages long is an insult to OCN.
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post #107 of 116
Quote:
Originally Posted by Usario View Post
More fake OBR crap.

The fact that this thread is 11 pages long is an insult to OCN.
It's only 3 pages for me.
post #108 of 116
Quote:
Originally Posted by Faint View Post
It's only 3 pages for me.
2 for me >.>
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post #109 of 116
Quote:
Originally Posted by Junkboy View Post
2 for me >.>
11 for me as well...
    
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post #110 of 116
As long as we are playing this game...1 page for me. AutoPager add-on
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