The maxup parameter defines the number of processes allowed per user login. This number should always be at least 5 processes smaller than nproc.
Value
Default: 150 processes
Range: 15-10000 (but never larger than nproc - 5)
When to Change
Increase this parameter to allow more processes per user. In a heavily loaded time-sharing environment, you may want to decrease the value to reduce the number of processes per user.