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CP/370 to Page Cache Performance Extension

IP.com Disclosure Number: IPCOM000034193D
Original Publication Date: 1989-Jan-01
Included in the Prior Art Database: 2005-Jan-27

Publishing Venue

IBM

Related People

Authors:
Bloom, MA Erhard, JJ Wade, BK [+details]

Abstract

The IBM Control Program/370 (CP/370) extension provides a link between the page cache and the IBM System/370 (S/370) operating system. With this link, CP can pass information to the cache that was previously unavailable. The information can increase the cache hit ratio, which will increase performance. In Virtual Machine/Personal Computer (VM/PC), the local S/370 operating system is not aware if Page Cache is present. The page file response times will often be faster, but there is no change in the way CP requests page file activity. This isolation from CP means that the benefits of cache may be obtained without changing CP. But it also implies that the cache must work without any information from CP.