[Freesurfer] question about Correction for Multiple Comparison

Hi all: A few days ago, i have asked about some questions about Correction for Multiple Comparison. But i'm still confused about it. The version of FS is 5.1.0. when i performed Correction for Multiple Comparison using command line with 'mris_glmfit-sim', it usually took many hours to complete. However, when i performed this in qdec, it only took a few seconds. Moreover, i couldn't find command with ''mris_glmfit-sim' in the terminal except for the 'mri_surfcluster' command. I wander whether the 'mri_surfcluster' command can be used for the Correction for Multiple Comparison?

Any suggestions will be appreciated. Thank you!