@vftdan If the program can be run under a different account or group, limits.conf can help.
https://unix.stackexchange.com/questions/102945/how-can-i-allow-a-user-to-prioritize-a-process-to-negative-niceness
@jollyrogueWhen I tried limits.conf it seemed only to be read for login shells. Using SGID + limits.conf would be the best solution, if it works; so I'll try once again
Gregory's Server
@jollyrogue
When I tried limits.conf it seemed only to be read for login shells. Using SGID + limits.conf would be the best solution, if it works; so I'll try once again