Local Processing

Some analyses run very slowly over the network. This is mainly due to slow write times where SPM functions write slice-by-slice. The slow-down depends on network traffic and the number of people accessing the files. The intensive network writing can also cause file errors.

A local processing option is implemented in some functions.

Function	Comments

Function

Comments

fMRI slice timing

Example at UCLA: slice timing over 420 HCP files

Network: 5840 seconds

Local: 620 seconds

fMRI Drifter

Less important since 2022 speed-up (reading volumes)

fMRI smoothing

Example at UCLA: smoothing 420 HCP fMRI files

Network: 1200 seconds

Local: 390 seconds (3 x speed-up)

This option copies files to a local folder (e.g., C:\matlab\spm12\toolbox\CSPM\temp\auto 2022-07-21 14h09m49s\), performs the processing, saves the output files back to the network folder, and deletes the local files and folder.