[Freesurfer] Advice: Freesurfer Parallel Processing on Large Dataset

Hi FSL Experts,

I am currently processing a large dataset and would like to seek some advice regarding parallel processing.

These are the specifications of my iMac: 3.2GHz , Intel Core i5, No. of processor: 1, Total number of cores: 4, L2 Cache per core: 256kb, L3 Cache: 6MB, Memory: 8GB.

Would it be useful to open 4 terminals and run RECON-ALL on 4 subjects simultaneously? Lastly, is there some sort of -flag I can use to maximize parallel RECON-ALLs ?

Currently, I am running 2 RECON-ALLs on 2 terminals and each subject take on average 7-9 hours for completion, which is rather fast I think.

Many Thanks.

Best Wishes, Elijah