DISTRIBUTED PARALLEL DATA PROCESSOR, RECORDING MEDIUM RECORDING DISTRIBUTED PARALLEL DATA PROCESSING PROGRAM AND DISTRIBUTED PARALLEL DATA PROCESSING SYSTEM

摘要

PROBLEM TO BE SOLVED: To maximize the throughput of the whole system by uniforming the loads of respective computers in the parallel data processing for mainly executing reading processing from a secondary storage device and to prevent the sharp decline of performance by uniforming a subrogated load by remaining computers even when a part of computers are stopped. SOLUTION: Large-scale data are divided, distributed and stored in respective computers, redundantly storing divided data so as not to have the copies of the divided data overlapped to execute processing for the same divided data by different computers. Processing time including reading time from the secondary storage device is measured, a distribution ration is calculated so that the number of requests for the processing of a computer having long processing time is reduced and the number of requests for the processing of a computer having short processing time is increased to subrogate the processing. When a part of the computers is stopped, the distribution ratio of the stopped computer is fixed to 0 and the distribution ratio is recalculated, so that subrogated processing is prevented from being concentrated to a part of the computers by distributing the loads.