Dear experts,

Thanks in advance for any help you can provide.  I’m using “mri_coreg” and trying to accelerate it with the “--threads” (and/or “--nthreads”) flags. However in the subsequent command feedback it looks like it is still using just one thread (see output below, “nthreads 1”; and also it is no faster).  Am I doing something obviously wrong?  There are no errors and it executes successfully…   Not sure if relevant but I’m using this for nifty (.nii.gz) files, my command is:

“mri_coreg --ref <path/to/ref.nii.gz> --mov <path/to/mov.nii.gz> --reg <path/to/registration.lta> --threads 10”

 

I’m on MacOS running a recent dev download (freesurfer-macOS-darwin_arm64-dev-20241011), but I’ve tried it on 7.4.1 with no success either.

 

 

…

INFO: using NIfTI-1 sform (sform_code=1)

Setting cras translation parameters to align volume centers

Init matrix params -0.4553 -6.3123 39.4428  0.0000  0.0000  0.0000  1.0000  1.0000  1.0000  0.0000  0.0000  0.0000 

Initial Matrix (RAS2RAS)

 1.00000   0.00000   0.00000   0.45535;

 0.00000   1.00000   0.00000   6.31235;

 0.00000   0.00000   1.00000  -39.44280;

 0.00000   0.00000   0.00000   1.00000;

Initial parameters to be opt -0.4553 -6.3123 39.4428  0.0000  0.0000  0.0000 

Creating random numbers for coordinate dithering

Performing intensity dithering

Performing intensity dithering on mov with computed dither

Separation list (2):  4  2   min = 2

DoSmoothing 1

DoCoordDither 1

DoIntensityDither 1

nitersmax 4

ftol 1.000e-07

linmintol 1.000e-03

SatPct 99.990000

Hist FWHM 7.000000 7.000000

nthreads 1

movsat = 3917.0000

mov gstd 0.9539 0.9539 0.7422

Smoothing mov

…