-smp 7 produces consistent EUEs on projects 750x

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Re: -smp 7 produces consistent EUEs on projects 750x

Postby YARDofSTUF » Mon Apr 09, 2012 3:02 pm

Well this thread answers my question.

I have been running "-smp 7" due to my AMD 6770 using up a core. Checked my log from last night and saw that I had 2 WUs EUE on me, a 7500 and a 7501.

After that it has picked up a 7504 which its been working on fine. I'll reset the client to use just "-smp" and see if that fixes the issue for future 7500s and 7501s. Its too bad this happens as I found a performance gain going from "-smp" to "-smp 7" even though the available processor power has been the same.

And just for reference, my system is an i7 2600, 8 GB RAM, AMD 6770, nothing overclocked.
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Re: -smp 7 produces consistent EUEs on projects 750x

Postby bruce » Mon Apr 09, 2012 7:55 pm

Use -smp 6.

An an AMD GPU requires one (virtual) core. Using -smp 8 needs all 8 to get reasonable performance, so -smp 7 + AMD does give a performance increase.

Using a prime number of SMP cores (including 7) increases the chances of getting an EUE, so 6 should be better than 7.

The i7 has four FPUs which are shared between pairs of virtual cores. Thus in isolation, choosing values for smp of 2 through 4 increases the throughput very significantly, and for 4 through 8 (assuming no EUE), performance increases quite slowly.

Use 6.

(I suppose it's possible that some really old AMD GPU might earn earn so few points if you use it plus -smp 6 than if you don't run it at all and use -smp 8, but that's a pretty unlikely scenario.)
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Re: -smp 7 produces consistent EUEs on projects 750x

Postby YARDofSTUF » Mon Apr 09, 2012 9:30 pm

Ya, at "-smp 6" I can finish a 6097 WU in 20 hours, plus do about 6k PPD on the 6770. With the SMP client using all 8 cores it can finish the 6097 WU in 15 hours 45 mins. So its not a big difference, thanks for the info Bruce.
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