john.archie.mck...@gmail.com (John McKown) writes: > Sounds a bit like a z/VM DCSS.
but that isn't how i originally implemented it, first on cp67/cms and then moved over to vm370/cms ... as part of paged mapped filesystem for cms http//www.garlic.com/~lynn/submain.html#mmap but as i've previously mentioned i let same shared pages appear at different virtual addresses concurrently in different virtual address spaces modulo the problem that lots of code in cms was generated by os/360 compilers that used the adcon convention ... that pinned executable code to fixed address ... which gave me enormous problems creating location independent code. http://www.garlic.com/~lynn/submain.html#adcon the small subset that was released as DCSS in vm370 release three, just restricted sharing to identical addresses ... but i continued to ship full support inside ibm (as well as cms paged mapped filesystem) ... also in the reference for (hone) apl ... workspace files could be mapped shared concurrently in different virtual address spaces at different virtual addresses (since it was interpreted code). re: http://www.garlic.com/~lynn/2014i.html#66 z/OS physical memory usage with multiple copies of same load module at different virtual addresses http://www.garlic.com/~lynn/2014i.html#67 z/OS physical memory usage with multiple copies of same load module at different virtual addresses http://www.garlic.com/~lynn/2014i.html#68 z/OS physical memory usage with multiple copies of same load module at different virtual addresses http://www.garlic.com/~lynn/2014i.html#71 z/OS physical memory usage with multiple copies of same load module at different virtual addresses http://www.garlic.com/~lynn/2014i.html#82 z/OS physical memory usage with multiple copies of same load module at different virtual addresses -- virtualization experience starting Jan1968, online at home since Mar1970 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
