PURPOSE: To improve the throughput of the system by improving the efficiency of paging processing by performing paging with a paging algorithm adaptive for an operating state at each occasion while the system is operated.
CONSTITUTION: While the system is operated, paging by plural paging algorithms is always simulated, an algorithm for which the calling back of pages is least is adopted for the next paging and the optimum algorithms are successively selected so that the most efficient paging processing corresponded to system working state can be performed. Each time when a paging request is generated, such paging processing is performed, the page of a page-out object selected by the current algorithm is stored in a memory pool 24, regarding the page of a page-out object selected by the candidate algorithm, a page number is written for every algorithm in arrangement 25 inside a Kernel area 23, and page-out history is kept remained.
TAKESO TORU
ONO KEITA
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