Hi Douglas,
You asked a good question which prompted me to do an experiment with just "-threads 8 -itkthreads 8". The run time has been quite slower (~8 hours) compared to ~5 hours it took with "-parallel -openmp 8". I agree with you about the underestimation of run time with the latter flags in that page. Though the page stipulates 3 hours, I have never been able to get a freesurfer done in less than 5 hours. Maybe it is related to the resolution of my data? -Tashrif . -parallel -openmp 4 should run things with 4 processors and parallelize across hemi where it can The run time on that page is probably not accurate. But is it faster when you use those options? On 7/16/2020 11:47 PM, Billah, Tashrif wrote: This <https://surfer.nmr.mgh.harvard.edu/fswiki/ReleaseNotes>says "-openmp <num> after -parallel", this <https://surfer.nmr.mgh.harvard.edu/fswiki/BrainstemSubstructures> says "export ITK_GLOBAL_DEFAULT_NUMBER_OF_THREADS=2", while this <https://surfer.nmr.mgh.harvard.edu/fswiki/mri_coreg> says "--threads nthreads" for parallel processing. I want to run recon-all and want all processes under recon-all to be parallelized. Which one(s) of the above flags should I provide with recon-all? Please note that the values are not my interest, the flags are. I know the proper values I should choose for the flags on my machines. So far I have been trying "-parallel -openmp 4" option only but my run time stays over 5 hours contrary to less than 3 hours stipulated in the documentation. -Tashrif . _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
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