Let's say I'm running a multicore process. How do I nice this via htop after submission? 
How does one nice a PID via htop after the process has begun?
nice;htop
My version of htop displays this as the help line:F1Help  F2Setup F3Search F4Invert F5Tree  F6SortBy F7Nice - F8Nice + F9Kill  F10QuitSo you would hit F7 to decrease the nice value, and F8 to increase it(the former may require special privileges).