Setting the initial priority of a process (nice command)

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You can set the initial priority of a process to a value lower than the base scheduling priority.

To set the initial priority of a process to a value lower than the base scheduling priority, use the nice command to start the process.

Note: To run a process at a higher priority than the base scheduling priority, you must have root user authority.
To set the initial priority of a process, type the following: 
nice -n Number CommandString
where Number is in the range of 0 to 39, with 39 being the lowest priority. The nice value is the decimal value of the system-scheduling priority of a process. The higher the number, the lower the priority. If you use zero, the process will run at its base scheduling priority. CommandString is the command and flags and parameters you want to run.

You can also use the smit nice command to perform this task.