# Eddy on macOS 10.13.6 (17G65): multi-threaded?

**URL:** https://community.mrtrix.org/t/eddy-on-macos-10-13-6-17g65-multi-threaded/1927
**Category:** Uncategorized
**Tags:** preprocessing
**Created:** [September 22, 2018, 3:21pm UTC](https://community.mrtrix.org/t/eddy-on-macos-10-13-6-17g65-multi-threaded/1927 "2018-09-22T15:21:05Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Caesar](https://community.mrtrix.org/letter_avatar_proxy/v4/letter/c/ecd19e/32.png) [@Caesar](https://community.mrtrix.org/u/Caesar)
#### Post date: [September 22, 2018, 3:21pm UTC](https://community.mrtrix.org/t/eddy-on-macos-10-13-6-17g65-multi-threaded/1927/1 "2018-09-22T15:21:05Z")

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Hello,

is eddy (openmp version) supposed to be multi-threaded on mac OS?  
The task is actually only using one core only of the 24 available on my config.

Here the dwipreproc string I’m using for some Philips DTI scans (very low profile right now: 1.5T scanner, 32 directions, b800, 2.5m isotropic scan):  
dwipreproc source.nii.gz destination.nii.gz -fslgrad /path\_to/file.bvec //path\_to/file.bval -nthreads 24 -rpe\_none -json\_import /path\_to/file…json -eddy\_options=" --slm=linear" -pe\_dir PE -info

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### Author: ![rsmith](https://community.mrtrix.org/user_avatar/community.mrtrix.org/rsmith/32/2672_2.png) [@rsmith](https://community.mrtrix.org/u/rsmith)
#### Post date: [September 30, 2018, 12:19pm UTC](https://community.mrtrix.org/t/eddy-on-macos-10-13-6-17g65-multi-threaded/1927/2 "2018-09-30T12:19:06Z")

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I can’t comment at all about running on Mac OSX, but I did myself experience some time in the past a version of `eddy` that I didn’t observe using more than one thread. I suspect this may have been the version of `eddy` provided with FSL before it was moved to closed source. Therefore I would suggest at the very least acquiring the most recent stand-alone `eddy_openmp` binary. However we really can’t provide assistance on an FSL command beyond that.