meaning of zappas
1. ZAPP Zero Assignment Parallel Processor. A virtual tree machine architecture in which a process tree is dynamically mapped onto a fixed, strongly connected network of processors communicating by message passing. The basic operation of each node is to apply a divide and conquer function which takes four arguments: 1 a function primitive which takes a problem description PD and returns true if it can be solved without division, 2 a function solve which takes a primitive PD and returns its solution, 3 a function divide which takes a PD and returns a list of PDs of smaller problems and 4 a function combine which returns the solution to a problem by combining a list of solutions of subproblems. Each node has a copy of the code and one is given the initial problem description. Task distribution is by process stealing in which a process constructs a descriptor for each subtask and idle lightly loaded processors can steal a descriptor from a physically connected neighbour. Z-buffer
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