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Preference for using the CAEN lab computers is given to individuals who show up in person to the CAEN lab and login directly to the computer's console display and use it interactively. The reason for this is to fairly allocate resources, especially during busy times. However, there are times during the day and semester when not all computers are in use by those who are seated in the labs, and CAEN encourages the full use of CAEN lab computers but under the following conditions:

• Individuals should not occupy more than one CAEN lab console display at a time. Thus, being logged into multiple CAEN lab computers on the console display simultaneously is prohibited.
• CAEN lab computers should not be disguised to look busy or broken or otherwise dissuade individuals to log in and use. This includes leaving notes by a computer indicating the computer is in use running a computation program. You must be present when logged into a lab console computer (exceptions are allowed for locking the display console and leaving for a 15 minute period of time).
• The background program should not be started on a CAEN lab computer that already have someone logged into its console display. (Hint: in Linux this can be accomplished by checking the ownership of the file "/dev/console" to see if its owned by "root" when no one is logged in to the console display). The background program should suspend or kill itself within 10 seconds of someone logging into the console display. Simply running the background program at a lower priority is not enough as this cannot prevent paging system thrashing. After the console display user has logged out, the background program can unsuspend or restart itself.
• Individuals should not use CAEN remote login or terminal servers to run compute intensive or background programs.

Individuals that violate this policy will be asked to immediately comply. If CAEN is unable to make contact with an individual, or if the impact is very significant or extremely widespread, access to those resources may be temporarily disabled.

Individuals who require background computing resources that cannot be satisfied with this policy are encouraged to evaluate the resources of the Center for Advanced Computing (CAC), which delivers high performance computing, grid infrastructure, large data storage, and advanced visualization services. With its multitude of processors, high-speed switches for fast networking, and terabytes of storage, the CAC can provide resources for most any computation problem or background job you may have.

All background processes, regardless of creation method, must adhere to existing University and CAEN policies and responsibilities.