NDLI: CPU-utilization and secondary-storage performance: the demand for a new secondary-storage technology

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CPU-utilization and secondary-storage performance: the demand for a new secondary-storage technology

Content Provider	ACM Digital Library
Author	Schneider, Peter
Abstract	Previous studies investigated the usability of charge-coupled devices (CCDs) in the context of economies to be achieved in main memory capacity. In systems with virtual memories, such economies result from the use of fast paging devices. In spite of the concomitant savings in main memory costs, which will probably be eaten up by the costs of the new-technology paging device, the price/performance ratio must be expected to be less favorable than that of conventional systems, since the share of the operating system software required for page fault handling will increase. More recent research has shown, however, that not only the degree of multiprogramming, i.e., the number of processes required to cover an I/O time interval, is a factor of crucial importance for optimum CPU utilization, but also the number of disk devices available in the secondary-storage system: unless the number of storage devices is large enough to handle, within an I/O time interval, at least as many parallel I/O operations as are needed to ensure that a sufficient number of processes are again ready for busying the CPU, the aim of full utilization of the CPU cannot be achieved---not even through a higher degree of multiprogramming. With disk devices of ever higher recording densities but otherwise nearly constant performance data becoming available, fewer devices than today will be required in the future to store the on-line data file volume. Since fast, favorably priced central processing units are likewise becoming available, it must be expected that the future systems, unlike the systems of today, will for the first time be beset with the problem of input/output bottlenecks arising from an insufficient number of storage devices. Rather than attempting to achieve the required I/O data rate through a sufficient number of devices operating in parallel, use should therefore be made of such devices as CCD storages in secondary-storage hierarchies, which offer themselves as the less costly solution to the problem.
Starting Page	819
Ending Page	825
Page Count	7
File Format	PDF
DOI	10.1145/1499402.1499552
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1977-06-13
Publisher Place	New York
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article

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