Working Set
A working set of a process is used to model the
dynamic locality of its memory usage
Working set = set of pages a process currently needs
Denning in late 60’s
Definition:
WS(t,w) = set of pages referenced in the interval
between time t-w and time t
t is time and w is working set window (measured in page refs)
Page is in working set only if it was referenced in last w
references