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SMP Folding: Understanding and Improving - Page 2

post #11 of 23
That is a lot of great work done right there Nice job! With this in mind, I'll start working to optimize my folding setup ASAP
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post #12 of 23
Thread Starter 
I made a few adjustments to terminology to help clarify some things.

I was on the official folding support site at http://forum.folding-community.org this evening checking on some performance stats and saw that there was a discussion based on some of the same testing I had done. After a little second thought, I posted a link to this thread as some examples of performance testing of SMP folding. I invited comments from those with more knowedge on the subject to feel free to comment.

Well about an hour later I got an message from Bruce. He is the site admin for the folding forums and if you have visited the site, you would recognize his name. Needless to say I had a knot in my stomach as I clicked on his message.

First of all the fact that he read my entire document made me quite happy. To my relief he was very complimentary and offered a few terminology changes and a better explanation of how the assignment servers and work servers functioned at stanford.

I have been busy the past few days getting my farm back up and running to boost up the numbers, and have not had as much time for testing as I had hoped. I should have more time this weekend to test out a more settings as well as get the C2D and the Athlon X2 I purchased for a better test pool.
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post #13 of 23
Great FAQ or Read on Folding Knitelife!!! rep+ for you from me...

I'll use this to help figure out some things on my rigs AND help others by directing them here....

Fold On! :-)
post #14 of 23
Good explanation in terms that are easy to understand.

Yes, many of the SMP work units are not only gated by processor speed, but also by memory bandwidth. Kick up the FSB or kick down the memory timings a bit, and watch your PPD go up.

And while the P5K board you are using is one of the best, it doesn't have a dip in the memory bandwidth from 401 to 460 MHz where boards like the Asus P5B do have that dip. Going from 400 to 401 will actually cost you some PPD. If you want to look in to this a little more, Google P5B and strapping.
post #15 of 23
Very very nice.
Sticky!

BTW -- so on a quad, in Linux, you have run two SMP clients; one to machine ID 1, and the other to 2, or both to the same number?

Just wondering.
Nice stuff.
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post #16 of 23
Thread Starter 
Quote:
Originally Posted by The Pook View Post
Very very nice.
Sticky!

BTW -- so on a quad, in Linux, you have run two SMP clients; one to machine ID 1, and the other to 2, or both to the same number?

Just wondering.
Nice stuff.
You need to use 2 different numbers. It will most likely throw an error message at you if you dont.
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post #17 of 23
Thread Starter 
Quote:
Originally Posted by 7im View Post
Good explanation in terms that are easy to understand.

Yes, many of the SMP work units are not only gated by processor speed, but also by memory bandwidth. Kick up the FSB or kick down the memory timings a bit, and watch your PPD go up.

And while the P5K board you are using is one of the best, it doesn't have a dip in the memory bandwidth from 401 to 460 MHz where boards like the Asus P5B do have that dip. Going from 400 to 401 will actually cost you some PPD. If you want to look in to this a little more, Google P5B and strapping.
Thanks 7im! They moved the the strap on the P5K to 500 instead of 400 on the P5B. Much better, and it looks like they are adding selectable strapping to the P5K deluxe and P5K3 deluxe.

I am just starting to test DDR3 on the P5K3 Deluxe. Not sure it if will yield much more production, but every little bit helps.
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post #18 of 23
'Nother question.

I'm sure it could be figured with some somewhat simple math, but I have no idea how.

RAM @ DDR2-965, 4-4-4-10, CPU @ 3.25Ghz.
Or.
RAM @ DDR2-1100, 5-5-5-10, CPU @ 3.25Ghz.

I'm leaning towards the last of which, but I'm not entirely sure -- figure since 4-4-4-6 to 5-5-5-12 was "only" ~100PDD on a quad, and 300+ just from 850 -> 1150Mhz.

Any insight from the F@H genius child?
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post #19 of 23
Thread Starter 
Quote:
Originally Posted by The Pook View Post
'Nother question.

I'm sure it could be figured with some somewhat simple math, but I have no idea how.

RAM @ DDR2-965, 4-4-4-10, CPU @ 3.25Ghz.
Or.
RAM @ DDR2-1100, 5-5-5-10, CPU @ 3.25Ghz.

I'm leaning towards the last of which, but I'm not entirely sure -- figure since 4-4-4-6 to 5-5-5-12 was "only" ~100PDD on a quad, and 300+ just from 850 -> 1150Mhz.

Any insight from the F@H genius child?
The DDR2-1100 will be a better choice in my opinion. It will help some WUs a little, and some WUs more. Tighter timing does help, but not as much as the overall mhz the memory is running at. I have not folded yet on an AMD processor, and I have heard that AMD does benefit more from tighter timing than Intel. Would be interesting to see the difference between the two. I purchased an Athlon X2, but at this point have more motherboard/cpu/ram combos than I have cases and power supplies, so I will have to try that out later.

On another note, I have yet to post on your results thread because I am running 2 SMP clients per quad, and did not know how to report the numbers accurately. I can run one rig with just a single SMP client, or should I report the results running two clients?
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post #20 of 23
If you run both, that'd be fine. I'll just state that it is two SMP clients and not just one.

BTW - why not run caseless? Lower deltas and no money buying cases.
It seems to like DDR2-1100 a lot better than 965 anyway...went from ~22 minutes a frame to ~19.5-20.
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