Opterony vs Xeony - aneb cim a jak prelozit program v C

Jan Houstek Jan.Houstek na mff.cuni.cz
Úterý Leden 17 11:41:43 CET 2006


On Tue, 17 Jan 2006, Horák Daniel wrote:
>> To myslite vazne, ze intelsky prekladac bude mit optimalizace,
>> ktere pobezi rychleji na Opteronu od AMD nez na Xeonu od Intela? :)
>
> A vy jste to zkousel, jak jsou na tom? Ja taky nic takoveho netvrdim 
> (kdyz uz nevidite ten smajlik), protoze tady slo jiny kompilator nez 
> GCC.

http://yro.slashdot.org/article.pl?sid=05/07/12/1320202&tid=142&tid=118&tid=123

"In AMD's recient anti-trust lawsuit AMD have examined the Intel compiler 
and found that it deliberatly runs code slower when it detects that the 
processor is an AMD. "To achieve this, Intel designed the compiler to 
compile code along several alternate code paths. ... By design, the code 
paths were not created equally. If the program detects a "Genuine Intel" 
microprocessor, it executes a fully optimized code path and operates with 
the maximum efficiency. However, if the program detects an "Authentic AMD" 
microprocessor, it executes a different code path that will degrade the 
program's performance or cause it to crash.""

--HH


Další informace o konferenci Linux