I am seeing a process titled, 'Locum' show up in my OS X process list. Does anyone know the details of what this process does?

  • 3
    If you see that is using a large amount of resources, you are probably emptying your trash or the trash is being emptied in the background; it can also eat CPU if you have a large number of "preview" windows opened.
    – user117090
    Feb 6, 2012 at 21:37
  • 1
    Locum also appears when copying old Time Machine data sets from one drive to another. The finder needs escalated privileges to be able to copy everything that's inside the backups.
    – Læti
    Feb 13, 2013 at 14:50
  • @user117090 — What would the process Locum have to do with "preview" windows ? Nov 24, 2013 at 17:15

2 Answers 2


Google says that it's a helper process for Finder, that does all the stuff Finder would need escalated privileges for.


In addition to what's said, if you choose to "Secure Empty Trash..." in Finder, Locum will consume a lot of resources because it will re-write the data (possibly several times) of where your trashed items resided. This will ensure you can never ever recover them.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.