On 3 March 2016 at 13:22, Francis Tyson Thomas francistthomas@email.arizona.edu wrote:
Also, it looks like development for GPU usage has been halted for now and so I was trying to use the CUDA 5 for getting it working under ubuntu 14.04. I have been not successful that as the cuda device isn't getting selected. Do you have any recommendations on that?
I have recently started looking at the CUDA port again, although I'm making no promises as to the amount of time I'll have to spend on it. This said I've got mri_ca_register running with CUDA 7.5 on my machine. On my E3 Xeon with a K1200, I can run mri_ca_register with the test dataset in about 9 minutes.
Are you compiling from source? I had to tamper a bit with the configure script before compiling CUDA was enabled again. I don't have access to the right machine at the moment, but as I recall, there was a line with_cuda="" which I had to comment out, since it was overriding the path to the machine's CUDA installation which I was passing on the command line. There are a few other minor bug fixes and performance improvements for GPU code which I've submitted for Zeke; no new kernels yet, I'm afraid.
If you could give me some more details about what you're doing, I may be able to help.
Just the standard warning: the GPU results will be different from the CPU results on the same inputs. We've been kicking around some ideas recently to quantify how different (and to devise input datasets where the correct answers are unambiguous).
Regards,
Richard