NCSA Policy regarding Co-scheduling

IA-64 Cluster (mercury)

Reservations may be made any time

No restrictions. However, please take into consideration that the scheduler and other back end processes may take 5-10 minutes to complete actions associated with the reservation, so allow a buffer period for making a reservation before submitting a job to run within that reservation.

Maximum nodes: 256 (512 processors)
Maximum wall clock time: 24 hours

The charge for a reservation is the number of processors used * wall clock time.

Usage will be charged for the entire interval of the reservation whether the reservation is used or not. If any unsed portion of a reservation is cancelled no charge will be made for the unused portion of the reservation

Example: A user requesting a reservation for a 64-node job using 4 hours will be charged 4 * 64 = 256 SUs

A reservation can be cancelled at any time and a no charges will be made for any unused portion of the reservation.

A total of 256 nodes (512 processors) can be reserved at any one time by any combination of users.

Your entire job request must run within the allotted reservation time. This includes a few minutes for the scheduler and other back end processes to complete initial activities at the beginning of your job. So allow for 5-10 minutes at the start. Examples:

A 3-hour job that is submitted within 2 hours of the end of your reservation will not start. If you submit a job with a wall clock time of 18 hours exactly at the start of your 18-hour reservation, it will not run; if you submit it with a wall clock time of 17 hours and 50 minutes, it should start.