m...@mentor-services.com (Mike Myers) writes: > John: > > Interesting that you should mention the CMS file system and MVS. > > Back around 1982 I was working for IBM in the Poughkeepsie, NY > lab. Four of us did a prototype which ran CMS in a TSO address space > under SIE.
I did a coporate advanced technology (adtech) conference/workshop that mar82 (first such corporate event in nearly six years) ... where some of the work was presented ... as well as various unix projects and some number of other things. a few old references to agenda/topics: http://www.garlic.com/~lynn/94.html#22 http://www.garlic.com/~lynn/96.html#4a http://www.garlic.com/~lynn/2000g.html#40 a little earlier there was corporate declaration that CMS was "strategic" for online conversational work and the TSO product administrator approached me about considering rewriting the MVS scheduler (so MVS might be able to better compete for things like interactive response) ... old email reference http://www.garlic.com/~lynn/2006b.html#email800310 in this past post http://www.garlic.com/~lynn/2006b.html#39 another blast from the past back in the cp67 era ... I had done paged mapped interface for the CMS file system, and later moved to vm370 and included it in the internal system distributions that I supported (like csc/vm and later sjr/vm). In the early 80s, it was easy to show that on identical configration & 3380s ... for moderate i/o intensive workload ... it had approx. three times the thruput of the unmodified, non-paged mapped filesystem (short pathlength, higher transfer rates, much better scaleability, etc). misc. past posts mentioning work on paged mapped filesystem http://www.garlic.com/~lynn/submain.html#mmap it wasn't simply just page-mapped/non-page-mapped ... because of the page-mapped I was able to do some fairly trivial filesystem enhancements (some of which would have been significantly more difficult in a non-page-mapped environment). Other things could have been done to the base filesystem ... but weren't ... like contiguous allocation ... akin to recent (linux) enhancement to EXT3 for EXT4 filesystem. -- virtualization experience starting Jan1968, online at home since Mar1970 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
