IBM Mainframe Forum

Dear all,

I tried to use the nice and renice commands on z/OS USS but they are both giving me the MSG FSUMF022:

nice -n -5 bash
FSUMF022 Cannot set priority

The explanation that is given in the manual is not really helping to identify the cause of the issue:

The request to set or change the scheduling priority of one or more processes failed.

I thought that it might be some security issue but even with Superuser authority it doesn't work.
Also gave myself access to the profile in the UNIXPRIV class but it doesn't help either:
PERMIT SUPERUSER.SETPRIORITY CLASS(UNIXPRIV) ID(xxx) ACC(READ)

There is no real documentation around that describes if and how this should work. After thinking a bit about it I wonder how this would relate to WLM management of the USS workloads and maybe it's intentional that the priority cannot be set with nice and renice?

Any help would be highly appreciated.

Thanks and kind regards,
Marcel