m42tom-ibmm...@yahoo.com (Tom Marchant) writes: > The implementation of PR/SM is indeed similar to VM. It may even share > quite a bit of code, but it is not virtual. You have to allocate the > processor > storage to each LPAR. Real devices have to be provided for each of them. > Consoles, for example.
a lot of PR/SM is the same virtual machine performance assist microcode. To some extent, PR/SM is a relatively static subset of VM ... with some fixed amount of physical resources (although this has become somewhat more dynamic over the years). Early implementations also had problems with microcode being mutually exclusive ... either for PR/SM or for VM (i.e. vm lost some of the microcode assist when run in an LPAR). some later discussion here http://www.vm.ibm.com/perf/tips/z890.html i may have unwittingly contributed to some of the Amdahl hypervisor (with ibm eventually responded to with PR/SM on 3090) by giving some detailed presentations on vm performance assist ECPS microcode at baybunch (monthly user group meeting held at slac that had lots of institutions & vendors) and then getting grilled by a couple Amdahl people at the after hrs event (usually at Oasis or the Dutch Goose). http://theoasisbeergarden.com/ http://www.dutchgoose.net/Dutch_Goose/Home.html -- 42yrs virtualization experience (since Jan68), 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
