Allocation Time and Congestion Handling

• problem is that there is a big overhead to checking all the allocation on a depot or a set of depots.
• so want to minimize how often this is done on a recurring basis
• so how short a time is "just short enough"?
• at depot level it will be best effort, real congestion handling should be done at higher level - at LoCI tools or L-Store
• for the next 6 months, our plan:
  • see what "short enough" is, try a month at beginning, maybe adjust as needed
  • work at LoCI/L-Store levels to do this right
  • implement a manager for something like a really short term duration use case as an interim solution (for example for the Condor checkpoint file use case).