1. A digital data processor comprising a plurality of processing cells interconnected by a network, A. each processing cell including an associated memory element having a plurality of sets, each set storing at least one page, each set maintained by the memory element of each processing cell corresponding to a respective one of said sets maintained by the memory element of each of said other processing cells, B. one of said processing cells, as a first processing cell, including i a page distributor for determining when a first one of said sets in the associated memory element reaches a predetermined storage commitment condition; and ii a page-transfer element for generating and transmitting to a selected one of said other processing cells, as a candidate processing cell, a transfer request signal for a selected page in said first one of said sets in response to said page distributor determining that said first one of said sets has reached said predetermined storage commitment condition; C. said candidate processing cell including a take-ownership element responsive to the transfer request signal for generating a request for ownership access to said selected page.