GPU Trial Factoring FAQ - Page 7

Dubslow · 2012-05-28, 05:15

Quote:

Originally Posted by aketilander

Well I think if you have two cards of different brands, one AMD and one NVIDIA in the same computer both are counted as the first one, so the switch should be "-d 0" or rather you don't need the switch at all, that is you can run mfakto and mfaktc without a switch, or if you like to use the switch it should be "-d 0" in both programs. The switch is only needed if you have more then one card of the same brand.

Well, I may be wrong on this one.

The whole '-d 0' only applies to CUDA programs, meaning only nVidia GPUs by default. CUDA will not even know if there's an AMD card.

Edit: I don't know how OpenCL/mfakto/AMD choose between more than 1 GPU.

flashjh · 2012-05-28, 05:26

Quote:

Originally Posted by Dubslow

Edit: I don't know how OpenCL/mfakto/AMD choose between more than 1 GPU.

mfakto uses the same -d 0 | -d 1 switch

sonjohan · 2012-10-16, 21:36

So, here I wanted to take benefit of the new mfaktc (0.19; I have 0.17), so I installed the nVidia 4.2 toolkit (complete) as well as copied the 0.19 files from the zip-file (in the original directory).

I get the following when running the new mfaktc
CUDA version info
binary compiled for CUDA 4.20
CUDA runtime version 0.0
CUDA driver version 4657.4 (actually, it's a random number)

Any ideas? I probably forgot something. (I'm the install & forget it kinda guy.)

flashjh · 2012-10-16, 22:22

Quote:

Originally Posted by sonjohan

So, here I wanted to take benefit of the new mfaktc (0.19; I have 0.17), so I installed the nVidia 4.2 toolkit (complete) as well as copied the 0.19 files from the zip-file (in the original directory).

I get the following when running the new mfaktc
CUDA version info
binary compiled for CUDA 4.20
CUDA runtime version 0.0
CUDA driver version 4657.4 (actually, it's a random number)

Any ideas? I probably forgot something. (I'm the install & forget it kinda guy.)

It looks like you're remoting in, are you? If so, you have to be logged in locally or use a remote site like logmein.com

If you're not remote, your driver is not installed correctly. Try removing all drivers and do a clean install with the newest drivers. Let us know what happens.

Dubslow · 2012-10-16, 22:59

Your drivers probably need an upgrade. If your drivers are definitely from before installing mfaktc 0.17, then drivers are definitely the problem.

Batalov · 2012-10-16, 23:13

Is it time to add mmff and mmff-gfn to the PDF?
(I don't volunteer.)

I will just provide the new links:
http://www.mersenneforum.org/mmff/ and
http://www.mersenneforum.org/mmff-gfn/
Plus there are the threads where the status is discussed.

sonjohan · 2012-10-17, 05:52

Quote:

Originally Posted by Dubslow

Your drivers probably need an upgrade. If your drivers are definitely from before installing mfaktc 0.17, then drivers are definitely the problem.

My drivers are still at 285.62.
Available version is 306.97.

I guess I'll have to update.

garo · 2012-10-17, 10:32

Are Radeon HD 6770M any good with mfakto or are mobile GPPUs just too poor?

Bdot · 2012-10-17, 13:56

Quote:

Originally Posted by garo

Are Radeon HD 6770M any good with mfakto or are mobile GPPUs just too poor?

It's much less than a 6770:

6770 = 800 cores @ 850 MHz
6770M = 480 cores @ 725 MHz

After all it comes out at about 50% of the desktop version. According to James' sheet the desktop is ~ 75GHz-days/day, but with 3 instances, slightly overclocked and higher SievePrimes I run it at 150GHz-days/day.

The 6770M should be good for 40-70 GHz-days/day, depending on how much CPU-power you can throw at it.

Keldor · 2013-03-01, 10:52

If I got that right, since version 0.20 sieving is done on the GPU, so mfakt doesn't need much CPU time, and there is no need to start multiple instances of mfakt to keep the GPU busy.
Perhaps the answer to "Q. Does mfaktc require CPU time?" in the first posting needs an update?

LaurV · 2013-03-01, 12:01

Indeed. That is only valid for mfakto, but hopefully not for long either, work is being done (by Bdot and co., if I not mistaken) to add OpenCL GPU sieving too.

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2012-10-16, 21:36	#69
sonjohan May 2003 Belgium 2·139 Posts	So, here I wanted to take benefit of the new mfaktc (0.19; I have 0.17), so I installed the nVidia 4.2 toolkit (complete) as well as copied the 0.19 files from the zip-file (in the original directory). I get the following when running the new mfaktc CUDA version info binary compiled for CUDA 4.20 CUDA runtime version 0.0 CUDA driver version 4657.4 (actually, it's a random number) Any ideas? I probably forgot something. (I'm the install & forget it kinda guy.)

2012-10-16, 22:59	#71
Dubslow Basketry That Evening! "Bunslow the Bold" Jun 2011 40<A<43 -89<O<-88 1110000110101₂ Posts	Your drivers probably need an upgrade. If your drivers are definitely from before installing mfaktc 0.17, then drivers are definitely the problem.

2012-10-16, 23:13	#72
Batalov "Serge" Mar 2008 Phi(4,2^7658614+1)/2 9,391 Posts	Is it time to add mmff and mmff-gfn to the PDF? (I don't volunteer.) I will just provide the new links: http://www.mersenneforum.org/mmff/ and http://www.mersenneforum.org/mmff-gfn/ Plus there are the threads where the status is discussed.

2012-10-17, 10:32	#74
garo Aug 2002 Termonfeckin, IE 3²·307 Posts	Are Radeon HD 6770M any good with mfakto or are mobile GPPUs just too poor?

2013-03-01, 10:52	#76
Keldor Feb 2013 2³ Posts	If I got that right, since version 0.20 sieving is done on the GPU, so mfakt doesn't need much CPU time, and there is no need to start multiple instances of mfakt to keep the GPU busy. Perhaps the answer to "Q. Does mfaktc require CPU time?" in the first posting needs an update?

2013-03-01, 12:01	#77
LaurV Romulan Interpreter Jun 2011 Thailand 9,377 Posts	Indeed. That is only valid for mfakto, but hopefully not for long either, work is being done (by Bdot and co., if I not mistaken) to add OpenCL GPU sieving too.