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Multi-GPU NVIDIA core

post #1 of 18
Thread Starter 
Quote:
Originally Posted by slegrand
Subject says it all... I've just been given clearance to spill the beans...

But some caveats upfront..

1. Device 0 *must* be a supported CUDA and DirectX display device. It's a client quirk, and there is a workaround in development, but for now, those are the rules.

2. If all your GPUs are CUDA devices and they are all extended onto the desktop, you can just use -gpu n where n is the display device number and it will work just like an ATI client, which means follow the ATI multi-GPU FAQ and you'll be folding away.

3. In the event that 2 above is not the case, there is an override. Skip the -gpu flag and instead set the environment variable NV_FAH_DEVICE=n where n is the CUDA device you wish to use. You may find yourself also playing with CPU affinity here to get the right mix, but that's why we provided the power tools here so to speak. And also it provides a way for anyone with a tesla server/board out there to run F@H today.


3. set VAR=value is the proper syntax. If you put spaces in this, it won't work, i.e. set VAR = value is incorrect.

4. You need to set these variables either in a script that launches the client, or before you launch the client. Doing so after starting the client will have no effect until it is stopped and restarted.

I'm sure we're about to see some quirkiness, but that's what betas are all about... Have fun!
http://foldingforum.org/viewtopic.php?f=43&t=3692
Quote:
Quote:
Originally Posted by friedrim
A new Nvidia core (v1.07) has been posted at http://www.stanford.edu/~friedrim/FahCore_11.exe. Scott has added support for a new environment variable, NV_FAH_CPU_AFFINITY, that allows the user to directly set the processor affinity mask or set it to zero to disable all affinity settings. The CPU affinity is set with individual bits (it's a mask, not a CPU selector):
setting NV_FAH_CPU_AFFINITY to
1 ==> CPU 0
2 ==> CPU 1
3 ==> CPU 0 and 1
4 ==> CPU 2
8 ==> CPU 3
15 ==> CPUs 0-3
etc

If this variable is undefined, the default behavior is exhibited. A primer on Windows environment variables is at http://www.chem.gla.ac.uk/~louis/software/faq/q1.html. Please test it by manually deleting an existing core. Thanks.
http://foldingforum.org/viewtopic.php?f=43&t=3689
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post #2 of 18
hmm...
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post #3 of 18
So this means we can use SLI? Or run it on X2 cards?

~Gooda~
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post #4 of 18
ahhh sweet Jesus the time is upon us. Let me get this bad boy running *giggles like a little school girl*
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post #5 of 18
Good find Bowman, thanks. rep+
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post #6 of 18
Quote:
Originally Posted by Havegooda View Post
So this means we can use SLI? Or run it on X2 cards?

~Gooda~
SLI like Crossfire is seen as 1 device so I doubt that SLI and 2 GPU2 clients will work.

All IMHO
    
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post #7 of 18
Alright so this is kinda of tricky to setup... I'm going to wait till someone here can tell me how to run this thing
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post #8 of 18
Thread Starter 
This thing made me go and look at the price of a K9A2 and four dual slot cards.

I'll wait for the dust to settle, then maybe..
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post #9 of 18
but I'll have to wait til a tutorial is out,cool though.
    
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post #10 of 18
Quote:
Originally Posted by markt View Post
but I'll have to wait til a tutorial is out,cool though.
Just follow the ati faq tutorial. Its not that hard to tell you the truth.

* Copy your \\Application Data\\Folding@home-gpu folder to a new folder \\Folding@home-gpu2 (\\AppData\\Roaming\\Folding@home-gpu in Vista)
* Create a new shortcut for the first client, and be sure to use the correct Target: and Start In: information. Note that one has to be very careful with shortcuts, and in particular, make sure that the "Start in:" field is set correctly. If you are having problems with automatic core upgrades, it is likely that your short cut is not set up correctly.
* Edit the shortcut properties to add the -gpu 0 switch to the end of the Target: field.
* Create a new shortcut for the second client, and be sure to use the correct Target: and Start In: information.
* Edit the shortcut properties to add the -gpu 1 switch to the end of the Target: field.
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