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Bulldozer Questions from an Intel User. - Page 13

post #121 of 162
Quote:
Originally Posted by JF-AMD View Post
No.




Not that I am aware of. Can you please explain to us how this works because I have never seen a single thread spread over multiple cores.
Quote:
Originally Posted by Dromihetes View Post
BallaTheFeared ,you ve been made checkmate !
Move on.
Yeah, no.



SuperPI is single threaded, one thread, multiple cores. Its not working on them at the exact same time, however there is activity on several cores from SuperPI alone, this "characteristic" of Windows causes my i5-2600k to only go to phase 2 turbo at most, usually it stays at phase 1.
    
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post #122 of 162
Quote:
Originally Posted by pietro sk View Post
AFAIk games code are branchy,
BD has big improvement in branch prediction and prefetchers

this year CRAY XK 6
http://www.cray.com/Assets/PDF/produ...K6Brochure.pdf



i love how intel users come here and complain..
are you guys jealous , or w.t.f ?
I have 3 AMD Machines sitting next to me and own their stock, I am not a fanboy.

Yes I am very jealous that I went from a 965 @ 4GHZ to a 2600K @ 4.5GHZ and saw a 60FPS increase in FSX.

I hope AMD takes the crown back thats how we get better prices and competition in the market.
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post #123 of 162
I thought maybe my previous post didn't show exactly what I was talking about well enough, so I reset my bios back to default so you can see how windows thread spreading causes turbo to fail.

Affinity on auto (all cores):


Affinity manually set to core 4:
    
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post #124 of 162
JF, the ball is in your court.

The issue Balla has highlighted will effect when cores/modules try to shut down for turboCORE, right?
Edited by JCPUser - 5/26/11 at 7:00pm
post #125 of 162
Quote:
Originally Posted by JCPUser View Post
JF, the ball is in your court.

The issue Balla has highlighted will effect when cores/modules try to shut down for turboCORE, right?
That is an intel issue. We can boost with 16 active cores.

And, for the record, that is not an example of an OS breaking a single thread across multiple cores. We still need to see that.

That ball was never in my court because nothing has been proven.
post #126 of 162
Tee Hee


I used the search function, thats the first time "break" was used in this thread.


Also it is using turbo, its just not using "per core used" turbo correctly because a single thread can run on multiple cores. Obviously not at the same time, that would be silly and defy how cpus work. However windows clearly takes a single thread and balances it over several cores so one core doesn't do all the work (probably something to do with thermals).

I think if you asked a x6 T AMD user to run SuperPI at factory settings you'd find their chip probably isn't going into turbo at all.

I'm sure you're aware there are a lot of people with X6/X4 cpus who play games and use programs that see this sort of "thread sharing" and think they're getting their monies worth because the program is clearly using all cores. I see it often with x6 AMD/INTEL users who have cpu bottlenecks but are unaware of it because "None of my cores are maxed out". It probably wouldn't help resale if more people were aware that often less cores, but faster cores provides a better end user experience for most people not in the sever market, while more slower cores probably produces the throughput they're seeking.
Edited by BallaTheFeared - 5/26/11 at 8:39pm
    
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post #127 of 162
Quote:
Originally Posted by BallaTheFeared View Post

I think if you asked a x6 T AMD user to run SuperPI at factory settings you'd find their chip probably isn't going into turbo at all.
Lawl,while running Linx on my Thuban,Turbo core kicks in on every core for a few seconds (according to Core Temp) .
Edited by Heavy MG - 5/26/11 at 9:17pm
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post #128 of 162
Are you stressing 3 or less cores?
    
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post #129 of 162
Balla, you keep missing the point. The original question (to actually quote properly) was:

Quote:
Originally Posted by Mokka View Post
OK, I have read quite a bit about the Bulldozer modules but I still don't completely understand. Can one module combine its resources and act as a single core?
The question was not "can a single thread be run across different cores, but not simultaneously". The question was can two cores combine resources to act as a single core.

In your scenario each core is discrete and resources are not combined. The application runs on different cores but they are never combined. They are each running at different times.

No OS lets a single thread run simultaneously across multiple cores that I am aware of.
post #130 of 162
So a thread is not split in "n" parts or whatever the core number is and it s not "cloned" and "done" in same time on all cores.
The thread is executed on every core in a fast succession.
Perfectly logical to me.
   
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