[RC5] gpu client

Kevin McCoy kgmccoy at idk-inc.com
Wed Feb 18 11:17:40 EST 2009

SideWinder wrote:
> I'm not sure, but I believe the problem is not so much in the client 
> being "not nice" in terms of scheduling with the GPU, but that the 
> driver has to reload lots of stuff to the card's memory when it 
> switches between graphics and the CUDA work.
It might be slow because this machine is running dual monitors at 1680 x 
1050 x 32bit with a 60 Hz refresh. Whats that work out to? 3360x1050? 
Eek! This is my software development machine (no games, some CAD) and I 
like to have a lot of windows open at a time.
> At least to me it doesn't look like there is any difference between 
> what is being drawn in 2D, the refresh rate just sucks when the CUDA 
> Dnetc is running. The Vista Aero UI is another issue though.
I'm running XP - too many issues on Vista that I am not willing to deal 
with. I'll let you early adopters bash MS bugs for me :-)
> Btw, what kind of keyrate do you get with the card and which core is 
> the best for it?
It peaks out at ~80 MKeys/S 
<http://idk.serveftp.net/cowboy/u1/host.html>. Click on the link and 
look down my herd stats table until you see "Samovar" (get it? :-) ) 
Samovar is pretty much my only RC5-72 machine right now, since I 
concentrate almost all my other cows on OGR.

The RC5-72 /average/ is a bit less, since I have to pause the thing to 
get any work accomplished.

I am using the CUDA 2-pipe 64-thd core. It worked out best in the long 
benchmark test I ran. Surprisingly, the short benchmark picked another 
core that wasn't nearly as fast. I think the CUDA client developers need 
to tweak the default-core picker a bit.

Best regards,

Kevin G. McCoy

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