Memory Model.

Cosmos uses a distributed memory model of parallelism, in contrast to the shared memory model of Parallel Tierra. In other words, each cell in a multicellular organism in Cosmos has its own copy of the program code, of the other cellular structures, and of the CPU state information (registers, instruction pointer, etc.). This distributed memory model, together with the Cosmos regulator system, should promote the emergence of differentiation in parallel programs. However, little work has so far been conducted with parallel programs in Cosmos, so it is not yet known how effective this approach really is.