1. A method of assigning prestack seismic input data of a seismic survey comprising an array of bins to processing nodes of a multiprocessor computer having remote and local memory comprising the steps of: a) dividing the processing nodes into a plurality of input and operator nodes; b) reading prestack seismic input data from remote memory into the local memory of input nodes; c) determining the coverage of prestack seismic input data associated with each bin in the seismic survey; d) broadcasting the coverage to at least the operator processing nodes; and e) assigning bins to operator processing nodes based on the coverage in each bin, the amount of coverage assigned to each processing node being generally equal.