Assume that node003 had both of these reservations in place simultaneously and a job attempted to access this node during business hours when standing reservation interactive was active. Reservation Stacking To make things just a little more confusing, Maui will not stack reservations unless it has to. If adequate resources exist, it can allocate reserved resources side by side in a single SMP node rather than on top of each other. Take the case of a 16 processor SMP node with two 8 processor standing reservations. Eight of the processors on this node will be allocated to the first reservation, and eight to the next.
Any configuration is possible.
Stacking reservations is not usually required but some sites choose to do it to enforce elaborate policies. There is no problem with doing so so long as you can keep things straight. It really is not too difficult a concept, just takes a little getting used to. See the ' Reservation Overview ' section for a more detailed description of reservation use and constraints. I am working on extending reservation ACL's to allow cleaner arbitrary ACL list support but there are some significant scheduling performance hits associated with completely general ACL support.