Abstract: A computer system having physical resources including a plurality of processors (10, 11, 12 ,13, 20, 21, 22, 23) and a physical memory (14, 24) for executing processes in a virtual address space by means of a virtual storage manager (59) that maps real pages of physical memory with virtual pages of the virtual address space. A scheduler (55) is arranged for scheduling the execution of threads of processes in the processors. The computer system includes at least one named set of physical resources RS (50, 51, 52) including a given number of identified processors (10, 11, 12, 13) and a given number of identified real pages (18, 19, 36). The scheduler (55) is configured to have a thread of an identified process executed by one or more of the processors of the set RS and the virtual storage manager (61) maps a real page of the set RS to a virtual page if the thread causes a page fault.