n00b PPD question

[Flycatchr]

everyone talks about the PPD, and it would seem from the way it is talked about that it is a primary measure of your clients performance on your GPU/CPU.

How on earth is it worked out? would someone please explain, as i have searched theses forums and i couldnt seem to find a clear explanation. i understand PPD is points per day, and would basically refer to how fast you client is folding the WU. is there section in the log file that gives you the WU points, are there standard points for most of the WU ( i know there are more points for higher spec'ed WU). is there a link that someone could plaese post so that i can work this out.

part of the reason for asking is that i am consistantly folding 1% every 11 minutes (1.19 core) on a 8500gt (GPU client)
windows vista home 64 bit
xfx 8300 mobo
8500 gt
8 gigs ram
phenome 9750 2.4 mhz

thanks

[bruce]

Suppose a WU is worth 500 points. Suppose your computer is fast enough to finish 1% of it in 15 minutes -- or 10% in 150m10s -- or 100% in 25.0278 houes. Then it finishes 24/25.0278 = 95.6% of the WU in one day (or 0.956 of that WU in a day). It earns 0.956*500 = 479.5 points per day

A different WU, say one worth 1000 points, will take about twice as long so if you finish that onr in 50 hous, it will earn 1000*24/50= 480 PPD

[anandhanju]

Several programs found in the 3rd party tools section of this forum provide accurate estimates of the PPD depending on your current WU and time per frame (TPF).

[Flycatchr]

thanks bruce, i do understand that maths, where do i find he value of the WU, is it in the log files somewhere?

i know that the more dificult WU do take longer and are worth more points, but are those points roughly the same PPD or more?

[anandhanju]

The value of a WU can be found at the psummary page: http://fah-web.stanford.edu/psummary.html

[Amaruk]

[snip] where do i find the value of the WU [/snip]

Currently Running Projects list:

http://fah-web.stanford.edu/psummary.html


~~~edit~~~

Must. type. faster.

[Flycatchr]

THANKS amaruk

edit - and Anan

[Flycatchr]

is there a specific formula that is used to work out the points for the folding
i know that there are supposed to more point for a more dificult WU, but what i see at the moment is that it takes longer, and it seems to work out to the same PPD anyway? please correct me if i am wrong

[anandhanju]

The Pandegroup runs each new project on their benchmark machine. Depending on how long it takes, it assigns the points for that WU. The purpose of doing this is to have a consistent and fair points scheme that can be shared by projects of the same class.

Each class of projects (e.g., PS3/ GPU/ SMP/ classic single processor) is benchmarked differently. Some of these give more points due to the trouble involved in monitoring and running these clients and the high resource requirements for these projects.

To return to your question, yes, what you have observed is correct. If a unit takes longer, it works out to the same PPD as a smaller unit that finished quicker. This is the purpose of benchmarking.

[codysluder]

Follow the link to th main FAH site http://folding.stanford.edu and pick the link for FAQ. Then pick the client you're running and you'll learn a lot, including how they benchmark and how they set the deadlines.