I am assuming you have five different Capacity Scheduler queues setup giving each a guaranteed 20% with bursting to 100% (probably better to be a bit under that such as 90% to limit preemption thrashing that could occur in some scenarios). The preemption configuration describes sounds like it is working, but it would only take away 20% of user1's usage so that user2 could get its guarantee of 20%. There are more fine-grained user limit factors within the queues, but it doesn't sounds like what you want either which I understand to mean if 1 user (100%), 2 users (50% each), 3 users (33%), 4 users (25%) and 5 users (20%). With the queue setup I suggested of 20-100% then you would get something like if 1 user (100%), add 2nd user then (user1-80%, user2-20%), add 3rd user (user1-60%, user2-20%, user3-20%), and on down to when adding the 5th user they all get 20%. Of course, that assumes a LOT of things. Generally speaking, the queue has a min guarantee and preemption can help you get hold of that when other queues are consuming more than their min. I do not believe this is a way to get the time-delayed release of resources you asked for above.
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