Hi Chintan - Freesurfer is open source, so all of our source code is available, but trac-all is actually a shell script, so you can find it under $FREESURFER_HOME/bin/.
TRACULA just expects the output files of bedpostX, and does not care if they were generated on GPUs or CPUs. Just provide the $subjectID/dmri directory (created by the first step of trac-all) as the argument to either version of bedpostX. After it's done, you can skip to the 3rd step of trac-all. Hope this helps, a.y ________________________________ From: freesurfer-boun...@nmr.mgh.harvard.edu [freesurfer-boun...@nmr.mgh.harvard.edu] on behalf of Mehta, Chintan [chintan.me...@yale.edu] Sent: Monday, October 16, 2017 5:31 PM To: freesurfer@nmr.mgh.harvard.edu Subject: [Freesurfer] TRACULA bedpostx step with gpu Dear FreeSurfer users, I am using Freesurfer 6.0 and Tracula 6.0 for processing MRI and DTI scans. The second step of the trac-all pipeline performs the ball-and-stick fit with the bedpost function from FSL. Documentation for FSL suggests that the use of GPUs can considerably speed this process (from ~15 hours on a single-threaded machine to 30 minutes on GPU; see bulletpoint 7 under processing pipeline at https://fsl.fmrib.ox.ac.uk/fsl/fslwiki/FDT/UserGuide#Processing_pipeline). Using GPU requires calling "bedpostx_gpu" (instead of "bedpostx") on a machine with a NVIDIA GPU and CUDA toolkit, both of which I have access to. The "bedpostx_gpu" function has, otherwise, the same flags as "bedpostx". While there is another post on the FreeSurfer forum on this topic (https://www.mail-archive.com/freesurfer@nmr.mgh.harvard.edu/msg54498.html), the answer there does not refer to how "bedpostx_gpu" can be used. Is there a way to call on "bedpostx_gpu" instead of "bedpostx" in the second step of the trac-all pipeline? More precisely, is there a way to adjust the command: > trac-all -bedp -c dmrirc to take advantage of GPU capabilities? Alternatively, is the source code for the "trac-all" binary available? For example, if is there a bash script that performs the same steps as the "trac-all -bedp -c dmrirc" available, then GPU capabilities can be exploited by running that script except replacing "bedpostx" with "bedpostx_gpu". Thank you. Best, Chintan
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