1. A dynamic processor-set management method comprising: process mapping processes to logical processor sets so that: when processor utilization by a process increases to meet a first utilization-related criterion, it is transferred from a shared processor set of logical processors to which set that and another process had been concurrently mapped to a dedicated processor set of logical processors to which set only that process will be mapped; and when processor utilization by a process decreases to meet a second utilization-related criterion, that process is transferred from a dedicated processor set of logical processors to which set only that process had been mapped to a shared processor set of logical processors to which set that process will be concurrently mapped with another process; core mapping said processor sets to processor cores; and executing processes mapped to a processor set on the core or cores to which that processor set is mapped.