Stuck at "We will use the optimizer Powell with default settings." about mdt HOT 2 OPEN

Hi Eli,

This is unfortunately a very common problem, but very hard to solve. The problem is that it hangs at kernel compilation. To run code on the GPU, MDT will offer a kernel to the compiler to compile the code the GPU will execute. These kernels are relatively large and complex and sometimes compilers trip over these kernels. I had similar issues where with the same GPU, an older driver worked fine, a newer did not, and an even newer worked fine again. It seems these compiler bugs come and go.

What you could try is to install the latest version of "POCL" as a CPU runtime. It may not give you GPU power just yet, but at least you can try experimenting with MDT. After that, you could try upgrading the GPU drivers to see if that works. It is unfortunately the best I can do, OpenCL driver support is somewhat volatile.

Best, Robbert

from mdt.

Hi Robbert,

Many thanks for the reply.

Unfortunately I could not get POCL to work with MDT either. However, I tried the singularity recipe here and the NODDI model ran successfully to completion on the HPC.

But alas, the ODI values were fixed at 0.5 throughout the entire brain mask so I am not sure what's happening. At this juncture, I find myself at a loss on how to proceed.

Another consideration is acquiring a dedicated workstation for MDT in my lab. However, I'm uncertain about the process, given the apparent complexity involving various factors such as OpenCL drivers. If anyone has successfully implemented MDT on a GPU, kindly share your workstation configuration.

I also explored AMICO, but the correlation between its regional ODI and MDT ODI (before it ceased functioning on our HPC) exhibited weak to moderate consistency within individual subjects.

AMICO offers an option to save modulated ODI maps (scaled by the tissue fraction, i.e., inverted free water maps), revealing a closer agreement with original MDT values.

Best Wishes,
Eli

from mdt.