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 for Load balancing
From The Free On-line Dictionary of Computing (30 December 2018) :

  load balancing
      Techniques which aim to spread
     tasks among the processors in a parallel processor to avoid
     some processors being idle while others have tasks queueing
     for execution.  Load balancing may be performed either by
     heavily loaded processors (with many tasks in their queues)
     sending tasks to other processors; by idle processors
     requesting work from others; by some centralised task
     distribution mechanism; or some combination of these.  Some
     systems allow tasks to be moved after they have started
     executing ("{task migration") others do not.  It is important
     that the overhead of executing the load balancing
     algorithm does not contribute significantly to the overall
     processing or communications load.
     Distributed scheduling algorithms may be static, dynamic or
     preemptive.  Static algorithms allocate processes to
     processors at run time while taking no account of current
     network load.  Dynamic algorithms are more flexible, though
     more computationally expensive, and give some consideration to
     the network load before allocating the new process to a
     processor.  Preemptive algorithms are more expensive and
     flexible still, and may migrate running processes from one
     host to another if deemed beneficial.  Research to date
     indicates that dynamic algorithms yield significant
     performance benefits, but that further (though lesser) gains
     may be had through the addition of process migration

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