Browse Prior Art Database

Reconfiguration of STORAGE Elements to Improve Performance

IP.com Disclosure Number: IPCOM000047719D
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 13K

Publishing Venue

IBM

Related People

Moore, BB: AUTHOR [+4]

Abstract

Reconfigurable computer systems require a mechanism for dynamically reassigning real main storage addresses within storage elements in order to reduce access contention associated with heavily referenced pages. In a computer system such as the IBM 3081 data processing system, main storage elements contain, for example, 8 megabytes of information storage circuits. Real main storage addresses are assigned to the circuits in smaller sections (e.g., 2 megabytes). Because of operator initiated reconfigurations or workload characteristics, heavily referenced page frames may be assigned to a single storage element. Consequently, system performance is improved by an SCP (system control programming)-initiated reconfiguration which separates these page frames.

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Reconfiguration of STORAGE Elements to Improve Performance

Reconfigurable computer systems require a mechanism for dynamically reassigning real main storage addresses within storage elements in order to reduce access contention associated with heavily referenced pages. In a computer system such as the IBM 3081 data processing system, main storage elements contain, for example, 8 megabytes of information storage circuits. Real main storage addresses are assigned to the circuits in smaller sections (e.g., 2 megabytes). Because of operator initiated reconfigurations or workload characteristics, heavily referenced page frames may be assigned to a single storage element. Consequently, system performance is improved by an SCP (system control programming)-initiated reconfiguration which separates these page frames. As an example of the above, Table 1 shows two storage elements of four sections each. The addresses in even-numbered page frames among frames 0-1023 are assigned to the fourth section of one storage element, the addresses in the odd frames among 0-1023 to the second section of the same element, and so on. In this configuration, MVS system pages are all backed in page frames 0-1023 and 3072-4095, that is, in storage element A. This situation is improved as follows. First MVS asks the system's Maintenance and Support Service Facility (MSSF) to describe the main storage addresses assigned to storage elements A and B. An MVS analysis routine then determines that all system pages are backed in storage element A and that page frames 2048-3071, for example, are not crucial to continued operations (e.g., they all ba...