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SR-2 Xeon e5620 Folding Question - Page 4

post #31 of 37
Have you tried messing around with the NUMA setting in the bios? I've heard one can reap better ppd by turning it off I think. Also which bios are you using with you're SR-2?
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post #32 of 37
Quote:
Originally Posted by thefreeaccount View Post
Rgr...but remember to keep an eye on any systems with that -smp N flag. It works OK with bigadv, but for some SMP WUs, it will cause your system to error the same WU over and over, eventually killing your completion rate and preventing you from getting bigadv in the future. Good job & apologies if you already knew that.
What you want to do with the -smp n flag is choose a number that has a ton of factors. 15(5x3x1) might not be terrible, but -smp (16) is preferred because it has more factors (2x2x2x2x1).

Because F@H creates a three dimensional array with the same dimensions as factors of the number of cores, 16 allows for arrays, 4x2x2, 4x4x1, or even 8x2x1 whereas 15 only allows for an array of size 5x3x1.

I ran into nothing but headaches when I attempted F@H with -smp 11.
    
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post #33 of 37
Thread Starter 
Quote:
Originally Posted by thefreeaccount View Post
Rgr...but remember to keep an eye on any systems with that -smp N flag. It works OK with bigadv, but for some SMP WUs, it will cause your system to error the same WU over and over, eventually killing your completion rate and preventing you from getting bigadv in the future. Good job & apologies if you already knew that.
Hmm, I've done quite a few WUs both with and without the flag (though admittantly, a lot more without). While I've not run into any that constantly error (in fact, I think I've only ever had one screw up), I'll keep that in mind to watch out for, thanks!

Quote:
Originally Posted by dude120 View Post
Have you tried messing around with the NUMA setting in the bios? I've heard one can reap better ppd by turning it off I think. Also which bios are you using with you're SR-2?
Hmm nope, not messed with any NUMA setting to my knowledge. I believe I'm using the most current version (A50). I installed the basic drivers and such from the disc, then updated from their website. All's been rock solid to the best of my knowledge.

Quote:
Originally Posted by RonindeBeatrice View Post
What you want to do with the -smp n flag is choose a number that has a ton of factors. 15(5x3x1) might not be terrible, but -smp (16) is preferred because it has more factors (2x2x2x2x1).

Because F@H creates a three dimensional array with the same dimensions as factors of the number of cores, 16 allows for arrays, 4x2x2, 4x4x1, or even 8x2x1 whereas 15 only allows for an array of size 5x3x1.

I ran into nothing but headaches when I attempted F@H with -smp 11.
Interesting. I didn't realize that that was what it was doing internally. Well I'd run SMP 16 but I've noticed I'm doing much better by allowing the GPU one core instead of none. I could do SMP 14 but that'd limit me in core usage, as well as SMP 13. SMP 12 would yield a lot of combinations but then I'd think it wouldn't be worth the waste of threads. Perhaps I can experiment with that later though.
Edited by The-Real-Link - 1/11/11 at 8:05pm
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post #34 of 37
Quote:
Originally Posted by RonindeBeatrice View Post
What you want to do with the -smp n flag is choose a number that has a ton of factors. 15(5x3x1) might not be terrible, but -smp (16) is preferred because it has more factors (2x2x2x2x1).

Because F@H creates a three dimensional array with the same dimensions as factors of the number of cores, 16 allows for arrays, 4x2x2, 4x4x1, or even 8x2x1 whereas 15 only allows for an array of size 5x3x1.

I ran into nothing but headaches when I attempted F@H with -smp 11.
Interesting, I have had absolutely no problems folding with 15 threads using -smp 15 bigadv on my sr-2.
As for the NUMA setting:
http://hardforum.com/showthread.php?p=1036267148
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post #35 of 37
Thread Starter 
That thread seems to show that NUMA can either be very helpful, very unhelpful, or same differerence with an internal change of how the folding loads the RAM and such. I think for my infancy still with OC'ing and the SR-2 in general, it's folding just fine at SMP -15 so I'll leave it as that unless I start erroring every WU or something. I'd at least like to finish one BigWU!
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post #36 of 37
Get 3.6ghz or higher!! Nothing like a 50% overclock!
post #37 of 37
Quote:
Originally Posted by kingofyo1 View Post
whoa... just thinking about the cost of that system.. 2 of those xeons new and the sr2 is around $1500 >.> but yeah, OC to 4 ghz and your ppd will be dramatically increased
And then there are the opteron 8-cores for ~$250 ... and a quad CPU board for $500. 16 intel threads for $1500 or 32 AMD threads for about the same price...?


Not that I've been hating on drooling over all the xeon multi cpu systems ever since I got here or anything.
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