2024-03-29T05:48:15Zhttps://ipsj.ixsq.nii.ac.jp/ej/?action=repository_oaipmhoai:ipsj.ixsq.nii.ac.jp:000600102017-03-31T05:36:57Z05471:05540:05543
Realization of a Processor with Virtual Tapes and Its EvaluationRealization of a Processor with Virtual Tapes and Its Evaluationenghttp://id.nii.ac.jp/1001/00060010/Articlehttps://ipsj.ixsq.nii.ac.jp/ej/?action=repository_action_common_download&item_id=60010&item_no=1&attribute_id=1&file_no=1Copyright (c) 1979 by the Information Processing Society of JapanInstitute of Information Sciences and Electronics University of TsukubaDepartment of Information Science University of TokyoKozo, ItanoEiichi, GotoArchitecture of a processor equipped with a "virtual tape" memory is presented and programming examples and their performance evaluations are given. The physical entity of the virtual tape consists of data blocks on auxiliary memory buffered in main memory by employing a look-ahead swapping technique. Logically a programmer can use a virtual tape as fast and unlimited tape memory. The virtual tape greatly simplified programs involving stacks queues and I/0 buffers. Matrix operation and fast Fourier transform program are shown to run more efficiently on a virtual tape machine than on a conventional paged virtual memory.Architecture of a processor equipped with a "virtual tape" memory is presented, and programming examples and their performance evaluations are given. The physical entity of the virtual tape consists of data blocks on auxiliary memory buffered in main memory by employing a look-ahead swapping technique. Logically, a programmer can use a virtual tape as fast and unlimited tape memory. The virtual tape greatly simplified programs involving stacks, queues and I/0 buffers. Matrix operation and fast Fourier transform program are shown to run more efficiently on a virtual tape machine than on a conventional paged virtual memory.AA00700121Journal of Information Processing 2265711979-07-301882-66522009-06-30