Limited Directory Scheme
Entry only contains pointers for the processors that actually contain the data
Cannot use simple flags any more - must specify a processor number (need log2(N) bits for each pointer if supporting a maximum of N processors)
- Only more space efficient than a full map scheme if: k * log2 (N) < N where k is the number of pointers, N is the number of processors.
- For N = 256, need to maintain less than 32 pointers