Lower CUDA requirement

Questions and Answers : Wish list : Lower CUDA requirement

To post messages, you must log in.

AuthorMessage
FloydHung

Send message
Joined: 22 Jul 99
Posts: 5
Credit: 690,896
RAC: 820
Taiwan
Message 906350 - Posted: 11 Jun 2009, 23:56:00 UTC

My notebook's GPU has 128MB. So I just wish the development team can lower requirement to 128MB. Otherwise, the 'insufficent memory' message is so anguished.

ID: 906350 · Report as offensive
Profile Ageless
Avatar

Send message
Joined: 9 Jun 99
Posts: 13815
Credit: 3,269,733
RAC: 0
Netherlands
Message 906364 - Posted: 12 Jun 2009, 0:31:09 UTC - in response to Message 906350.
Last modified: 12 Jun 2009, 0:31:51 UTC

The need for at least 256MB of video memory is for translating the task into something the GPU can handle. It can't just run through the data as the CPU can do it, as a task has to be translated into kernels for the GPU to run. These kernels take up a lot of space, around 200MB.

It's not just one kernel running, it's a lot of them. That's why the CPU is used to transfer this data from the disk to the video memory and once the GPU is done with it, back to the disk to make room for the next kernel.

There is for this project just no way around using that amount of video memory. Perhaps that other projects use less memory, but I wouldn't hold my hopes up.


Jord

Ancient Astronaut Theorists suggest that in many ways, you can be considered an alien conspiracy!

ID: 906364 · Report as offensive
FloydHung

Send message
Joined: 22 Jul 99
Posts: 5
Credit: 690,896
RAC: 820
Taiwan
Message 908996 - Posted: 19 Jun 2009, 0:18:35 UTC - in response to Message 906364.

Well, somehow before verion 6.6.26(?) I did not receive "insuff..." message and seem CUDA worked. Maybe I was wrong about those messages. :D
Anyway, if the development team can overcome this tech issue, I will be very very happy. lol

ID: 908996 · Report as offensive
OzzFan
Volunteer tester
Avatar

Send message
Joined: 9 Apr 02
Posts: 15112
Credit: 45,328,579
RAC: 43,417
United States
Message 909042 - Posted: 19 Jun 2009, 3:35:20 UTC - in response to Message 908996.

You didn't get those messages before, but the requirement was always at 255MB of video RAM. If you didn't have it, it would fall back to CPU processing.

I really don't foresee them lowering the requirement to 128MB. It was nVidia's own programmers that made the program, so I have to assume they optimized it as best they could and 255MB was the lowest they could do.


ID: 909042 · Report as offensive

Questions and Answers : Wish list : Lower CUDA requirement


 
©2016 University of California
 
SETI@home and Astropulse are funded by grants from the National Science Foundation, NASA, and donations from SETI@home volunteers. AstroPulse is funded in part by the NSF through grant AST-0307956.