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Radeon 6850 and FX-8150 still less than 7k ppd

post #1 of 8
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The title says it all. I should be burning more than that for sure. I've search the guides and haven't come up with anything. Where do I start looking?
post #2 of 8
What client are you running?

Are you running an flags such as advance or beta?

I am going to assume that you are not and try to help. drop the smp on the processor from 8 to 7. This should bring you up to ~14K ppd on the processor. The extra thread is needed for ati for non-17 core work units.

The 6850, I really don't remember what the production is on it, but 8-9K ppd is what is coming to mind right now even on the advance wu.
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post #3 of 8
-smp 6 is what the OP would want, IIRC GROMACS cores do not play nice with 7, but I could be remembering wrong smile.gif
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post #4 of 8

Nah, he can do 7 on the FX since it's actually 8 cores rather than an Intel i7 4 core with 8 threads. Those chips have to have even numbers, 2-4-6-8 since they're HT.


Edited by BWG - 8/8/13 at 7:30am
 
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post #5 of 8
I thought it was more of a GROMACS thing, where it does not like/play nice with prime numbers, nothing to do really with HT, that was my understanding atleast, and the reason certain number for -smp on larger 4p G34 machines are not used.
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post #6 of 8

I did -smp 5 for a few months on my X6 with no issues, but -smp 7 on my i7 was a no go as it threw errors at me until I changed it to -smp 6.

 
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post #7 of 8
http://hardforum.com/showthread.php?t=1607020

Has quotes from Kasson saying that -smp 7 will cause work unit stability issues, and shouldnt be used smile.gif

One of the quotes:
Quote:
The problem is that Gromacs does a 2D decomposition based on factoring the number of threads you give it. So if you give it a number like 7 or 13, the best it can do is 7x1 or 13x1, whereas 12 can yield 4x3 and 8 can yield 4x2. The more thinly the system gets broken up, the more likely it is to fail. Hence easily factorable numbers are better...

Most of the early A3 SMP work units we've done involve relatively large systems (particularly many of the influenza-related projects I have). So I think we may have had an early bias towards systems where one could get away with less-stable settings more of the time


So yes, 7 is a bad idea on A3 units atlesat, which some are still out there. If you get one and it fails due to -smp 7 , your boned until a client restart, whereas Kasson has said that -smp 3 and -smp 5 are fine
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post #8 of 8

Yes, I remember the word of caution and what they said, but I folded the X6 in January quite a bit in TC. It must be a non-issue for a5.

 
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