Hi Aziz

-openmp 4 will speed up the recon of a single subject. If you had 16 processors and enough RAM you could run 4 subjects at the same time that way and each of them would be faster. We've had recons complete in 2-3 hours this way, depending on the anatomy.

cheers
Bruce
On Sat, 4 Feb 2017, Aziz Nanthaamornphong wrote:

Hi Bruce,

So, I am not sure if I understand correct. Suppose, I would like to run 4 
subjects simultenously, I have
to run the recon-all command of each subject on each terminal with -openmp. 
Otherwise, is there any
other options to run 4 subjects in one terminal.
Thank you,
Aziz.

On Sat, Feb 4, 2017 at 9:46 PM, Bruce Fischl <fis...@nmr.mgh.harvard.edu> wrote:
      yes it does, and it should significantly reduce execution time unless you 
don't have
      multiple cores

      cheers
      Bruce
      On Sat, 4 Feb 2017, Aziz Nanthaamornphong wrote:

            Hi Bruce,
            Does FS6 support the 'openmp 8' flag? I tried to use this flag with 
'recon-all
            -all' on FS6, but it took
            longer time for only one subject. 

            Thank you,
            Aziz.

            On Fri, Feb 3, 2017 at 10:16 PM, Bruce Fischl 
<fis...@nmr.mgh.harvard.edu>
            wrote:
                  Hi Aziz

                  with multiple course you can specify -openmp 8 for exmaple to 
use 8 cores,
            which speeds
                  things up a lot. It also depends how many recons you will be 
running at
            the same time. A 16
                  core machine with 64G of ram would be able to run 4 recons in 
a few hours
            each.

                  cheers
                  Bruce

                  On Fri, 3 Feb 2017, Aziz Nanthaamornphong wrote:

                        Hi experts,
                        I would like to find a new high-performance computer to 
run the
            reconstruction
                        process in Freesurfer. 
                        Currently, I used a single computer (Intel core i7, RAM 
8MB) to run
            the commands
                        (e.g., 'recon-all -all'
                        ) that spent average time 7-9 hours per one subject 
data. 

                        Please let me know what the best spec of the computer 
that can
            reduce the time
                        to 2-3 hours (if
                        possible). 

                        Thank you,
                        Aziz


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            --

            Aziz Nanthaamornphong, Ph.D.,
            Chair of Master of Science Program in Information Technology
            Department of ICT
            Faculty of Technology and Environment
            Prince of Songkla University, Phuket Campus
            +66 7627 6716 (v)
            http://research.te.psu.ac.th/aziz



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