External Email - Use Caution

Not a developer, but this is something that comes up frequently in most analysis situations.

For qsub, you should be able to just make separate scripts for each subject and submit them all at once and let the scheduler node handle the rest.

E.g. If you have sub1.sh, sub2.sh,....subn.sh as the submission scripts you can just submit them all:

for j in sub*.sh; do qsub ${j} done

You may consider writing a wrapper that will create all the subscripts based on an input...e.g.:

SUBNAME=$1

Echo "#!/bin/bash #$ -cwd #$ -o /data/holly-host/UserName/logs/ #$ -j y #$ -S /bin/bash #$ -N reconall

export FREESURFER_HOME=/usr/local/freesurfer/8.2.0-1 export FS_LICENSE=/usr/local/freesurfer/8.2.0-1/license.txt export SUBJECTS_DIR=/data/holly-host/hliu/freesurfer_subjects

source $FREESURFER_HOME/SetUpFreeSurfer.sh

mkdir -p $SUBJECTS_DIR

env | grep -E "FREESURFER|FS_LICENSE|SUBJECTS_DIR"

recon-all -all -i /data/holly-host/UserName/anat/${SUBNAME}_t1w.nii -s sub-01 SegmentAAN.sh sub-01

" > ${SUBNAME}.sh

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Today's Topics:

1. Re: Recon-all for multiple subjects on parallel (Huaiyu Liu)

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Message: 1 Date: Tue, 9 Jun 2026 14:35:49 +0000 From: Huaiyu Liu huaiyu.liu@ucl.ac.uk Subject: [Freesurfer] Re: Recon-all for multiple subjects on parallel To: Freesurfer support list freesurfer@nmr.mgh.harvard.edu Message-ID: <DB8PR01MB5899E8997D209D3F51B01799DB1D2@DB8PR01MB5899.eurp rd01.prod.exchangelabs.com> Content-Type: multipart/alternative; boundary="_000_DB8PR01MB5899E8 997D209D3F51B01799DB1D2DB8PR01MB5899eurp_"

External Email - Use Caution

Dear FS Developers,

I recently asked a question about how to run recon-all in parallel for multiple subjects (like 4-8). Could someone give me some clues, I would be really apperciate.

Best, Huaiyu ________________________________ From: Huaiyu Liu huaiyu.liu@ucl.ac.uk Sent: Thursday, May 28, 2026 18:21 To: Freesurfer support list freesurfer@nmr.mgh.harvard.edu Subject: Recon-all for multiple subjects on parallel

Dear FreeSurfer Developers,

I am using the following code on my department's HPC to (1) reconstruct a single participant’s T1w image and (2) perform brainstem segmentation. The code works well, but I have 40 participants in total. Hence, I wonder how I can run recon-all and brainstem segmentation for multiple subjects in parallel. Could you tell me the code?

1) FreeSurfer version: --freesurfer-linux 8.2.0-1 on my department's HPC (high-performance cluster)

2) My shell script for recon-all and brainstem segmentation for single subject: #!/bin/bash #$ -cwd #$ -o /data/holly-host/UserName/logs/ #$ -j y #$ -S /bin/bash #$ -N reconall

export FREESURFER_HOME=/usr/local/freesurfer/8.2.0-1 export FS_LICENSE=/usr/local/freesurfer/8.2.0-1/license.txt export SUBJECTS_DIR=/data/holly-host/hliu/freesurfer_subjects

source $FREESURFER_HOME/SetUpFreeSurfer.sh

mkdir -p $SUBJECTS_DIR

env | grep -E "FREESURFER|FS_LICENSE|SUBJECTS_DIR"

recon-all -all -i /data/holly-host/UserName/anat/sub-01_t1w.nii -s sub-01 SegmentAAN.sh sub-01

3) My command for submit the jobs to the cluster with 32 GB of RAM request

qsub -l vf=32G -l h_vmem=32G reconall

Thank you very much for your time and consideration, I look forward to hearing from you.

Best, Huaiyu _________________________________________ Huaiyu Liu (Ted) Postdoctoral Research Fellow Department of Imaging Neuroscience, Functional Imaging Laboratory University College London 12 Queen Square, London WC1N 3AR