Page Cache System for Pc/370
Original Publication Date: 1989-Jan-01
Included in the Prior Art Database: 2005-Jan-27
The purpose of any cache is to increase computing system performance by decreasing data access time. The IBM Virtual Machine/Personal Computer (VM/PC) Page Cache employs an area of PC-AT RAM to cache I/O to the VM/PC page file. This reduces the run time of local IBM System/370 (S/370) jobs that page. The slow hard disk access time of the PC has been shown to increase job times significantly when paging increases. The page cache system described here is transparent to the S/370 operating system (and therefore to the S/370 user). No modification is needed to VM/PC Conversational Monitoring System (CMS) or the VM/PC local session application program. All of the page cache changes are in the CP/370 and control program input/output (CPIO) portions of VM/PC. The page cache system requires PC AT extended memory.