On 5/15/24 18:47, Ken Seefried via cctalk wrote: > Please...I'm trying very hard not to remember them (or NOS...worse, NOS/VE).
I left CDC at around the time that SCOPE 3.4 was being renamed NOS BE and KRONOS was becoming NOS. I remember attending a design meeting for the pager in what was to become NOS/VE. I asked the presenter if he'd conferred with any of the virtual memory pager talent that CDC had in-house. Blank stare. I informed him that the STAR-100 people had lived in that particular hell since about 1969--and that demand paging was not the way to run a shop. STAR had long-since switched to a working set algorithm. Even that wasn't enough. If one selected a large (65 KW) page size and set up certain vector instructions so that addresses crossed page boundaries, it was impossible to get the required pages into memory all at once. The system just sat there and thrashed.... --Chuck
