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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
…

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