Path: csiph.com!eternal-september.org!feeder.eternal-september.org!nntp.eternal-september.org!.POSTED!not-for-mail From: Lynn Wheeler Newsgroups: alt.folklore.computers,comp.os.linux.misc Subject: Re: My Computer History (Re: Is This An Old Folks Home?) Date: Mon, 09 Nov 2026 07:48:09 -1000 Organization: Wheeler&Wheeler Lines: 50 Message-ID: <87tslpoq06.fsf@localhost> References: <18e45d18dce2f904$1893$2999836$802601b3@news.usenetexpress.com> <11ce3a1$advt$1@dont-email.me> <11ceaa8$c9ap$1@dont-email.me> <11cm2tq$33858$1@dont-email.me> <11cnco2$3gavo$2@dont-email.me> <11cndv9$3gu68$1@dont-email.me> <-xqdnZUBGPklVnL3nZ2dnZfqnPSdnZ2d@giganews.com> <11cpall$52k0$1@dont-email.me> <11crbft$svli$1@dont-email.me> MIME-Version: 1.0 Content-Type: text/plain Injection-Date: Mon, 09 Nov 2026 17:48:17 +0000 (UTC) Injection-Info: dont-email.me; logging-data="1519194"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1+OGpNVf8pPfRs8s7tr9vDsXcAGsNPIXzc="; posting-host="cc0d1c59bf80b5e05b6bd4808524c619" User-Agent: Gnus/5.13 (Gnus v5.13) Cancel-Lock: sha1:ZFn5WaDIkD1Wl8wN1O1bxxvilxc= sha1:RHRS6325LiV+REFRcUvIMucSO+Y= sha256:GbL8vPsmR5QIwCugrIdW2fVrV9pvRA8S4TMWZ4emtHw= sha1:jSD055clR/CzyRUUnoue32d9uhI= sha256:r741nkcSj/GU4NDR0uAAPoHNt/5Xog/+Erl1T2CDvkM= Xref: csiph.com alt.folklore.computers:236699 comp.os.linux.misc:95388 Lars Poulsen writes: > Back in my University Computer Center days, a few of us attended a > class in London on debugging paradigms. On the first day, we > introduced ourselves and described our workplace's significant > computer systems. One of the attendeed was from IBM Grenoble, and as > he described their main system with a whopping 16MB of main memory, we > all oohed and aahed and wondered aloud how anyone could make > productive use of that much memory. But he explained that they easily > used it all up with their static analysis tools, their version control > system, their auditing programs making sure the programs adhered to > their programming standards etc. We all shook our heads at how IBM > clearly had too much money on their hands if they could spend it on > such frills!! I was undergraduate when 360/67 arrived and hired originally full-time responsible for OS/360 (360/67, running as 360/65). Then CSC came out to install (virtual machine) CP/67 (3rd after CSC itself and MIT Lincoln Labs) and I mostly get to play with it during my weekend 48hr window. I then spend a few months rewriting pathlengths for running OS/360 in virtual machine. Bare machine test ran 322secs ... initially 856secs (CP67 CPU 534secs). After a few months I had CP67 CPU down from 534secs to 113secs. I then start rewriting the dispatcher/scheduler (dynamic adaptive resource manager/default fair share scheduling policy), paging, adding ordered seek queuing (from FIFO) and mutli-page transfer channel programs (from FIFO and optimized for transfers/revolution, getting 2301 paging drum from 70-80 4k transfers/sec to channel transfer peak of 270). I was invited to spring SHARE meeting in Houston for "official" CP67/CMS announcement. Six months after univ initial CP/67 install, CSC was giving one week class in LA. I arrive on Sunday afternoon and asked to teach the class, it turns out that the people that were going to teach it had resigned the Friday before to join one of the 60s CSC CP67 commercial online spin-offs. Then before I graduate, I was hired into small group in Boeing CFO office to help with the formation of Boeing Computer Services (consolidate all dataprocessing into independent business unit). When I graduate I join the IBM Cambridge Scientific Center that had 768kbyte 360/67 (104 pageable 4k pages, and I upgrade the page replacement algorithm with my global "LRU" algorithm). Then Grenoble Science Center got a 1mbyte 360/67 (155 pageable 4k pages) running CP67/CMS and modify page replacement to local "LRU" algorithm from 60s academic literature. Both centers had similar CMS workload, except I got 75-80 users with better response and throughput than Grenoble running 35 users. -- virtualization experience starting Jan1968, online at home since Mar1970