[Freesurfer] recon-all -use-gpu instances on a node with multiple GPUs

Hello FreeSurfer Developers,

I’m attempting to make some performances evaluation on recon-all using GPUs on a node with 4 nVidia K80. Submitting different instances of recon-all on 8 different subjects, every instance run on the same device (#0), compromising the efficiency of the test. Is there a way to address different instances on different devices? Thank you in advance.

FreeSurfer version: freesurfer-Linux-centos6_x86_64-stable-pub-v5.3.0.tar.gz cudawn9:~ # cat /etc/SuSE-release SUSE Linux Enterprise Server 11 (x86_64) VERSION = 11 PATCHLEVEL = 4 cudawn9:~ # uname -a Linux cudawn9 3.0.101-63-default #1 SMP Tue Jun 23 16:02:31 UTC 2015 (4b89d0c) x86_64 x86_64 x86_64 GNU/Linux

Simone