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[GCN] Multicore doesn't mean equal core

post #1 of 15
Thread Starter 
Not all cores perform equally on a multicore chip, researchers find

http://www.gcn.com/online/vol1_no1/47765-1.html

(Obvious, of course. This has implications for F@H, too, as discussed in the article.)
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post #2 of 15
Good luck with those i7.
post #3 of 15
Thread Starter 
I haven't read the research paper yet, but it suggests that future operating systems could incorporate some changes to make multicore processing more efficient. Time to get Linux.
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post #4 of 15
I wonder if this effect is more common in lower bin CPU? It would be interesting to see the data, especially compared to stock and overclocked CPUs, and different CPUs along the same line.
post #5 of 15
I think the bigger problem (for us at least) is that multicore means we can only overclock as much as the slowest core will allow. For quads especially there's a pretty high chance of there being at least one 'dud' in there.
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post #6 of 15
Quote:
Originally Posted by error10 View Post
I haven't read the research paper yet, but it suggests that future operating systems could incorporate some changes to make multicore processing more efficient. Time to get Linux.
Lol, I knew you couldn't resist.

Let's hope it's not too far in the future they start making those changes, I mean it's not like multi-core processors just came out...
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post #7 of 15
Quote:
Originally Posted by Arkanor View Post
I think the bigger problem (for us at least) is that multicore means we can only overclock as much as the slowest core will allow. For quads especially there's a pretty high chance of there being at least one 'dud' in there.
Not with AMD, as AMD allows you to disable cores completely, or OC them at different amounts individually. Good cores can be pushed really high while dud cores are kept lower or turned off to save TDP/Heat for better cores.
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post #8 of 15
Thread Starter 
Quote:
Originally Posted by zooterboy View Post
Lol, I knew you couldn't resist.

Let's hope it's not too far in the future they start making those changes, I mean it's not like multi-core processors just came out...
Well you know there will be an experimental Linux kernel next week. I might write it myself if I get REALLY bored over the holiday. But for Microsoft, you'll have to wait for Windows 8...or maybe 9...

Plus, the point of the research, as I understand it, is that programs (or at least the OS) can become aware of how each particular core performs relative to each other and optimize scheduling based on that data. Among other things this could mean a faster and more efficient Folding@home core.
Edited by error10 - 12/23/08 at 8:56pm
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post #9 of 15
Wow interesting read.
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Bye Bye 775
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post #10 of 15
Quote:
Originally Posted by JTD92 View Post
Good luck with those i7.
You have a multi-core CPU... Good luck with Core 2 Duo?

"A number of factors contribute to that variance, the researchers said. One factor is how the CPU hardware handles interrupts. In many cases, they could be directed to a single core, which could slow other applications on that core. However, if the interrupts are distributed across all the cores dynamically, there is no guarantee that the core handling the interrupt will be the same one that is running the program for which that interrupt was intended. Therefore, additional communication time is needed between the two cores."

Uh..isn't that what out of order executing cores/branch prediction is supposed to alleviate? I'm thinking yes.

@ error10: Did MSFT kill your kittens?
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