>It may be in some old SHARE presentations, but Multi-system's Test >used to run VM under MVS and more MVS's under VM according to >Peter B. Yes, I believe it was some how connected to Preferred Machine Assist (PMA) where page 0 was actually owned by MVS not VM.
This was to facilitate performance for VM/MVS shops because there was no comparable VM/VSE feature for MVS and VM to control the handshaking between the two The entire MVS virtual machine would get swapped out whenever an MVS address space, eg TSO user, batch, was swapped out. The handshaking issues have since been resolved by later versions of VM and/or MVS and the two now coexist fairly well. I did not mean to touch off a debate, however delightful, with my "glittering generality" as to what constitutes a "true" operating system. It was just from the little I can tell, as an outsider, that in the "one-upsmanship" operating system battle, VM still controls page 0, though there have been momentary lapses like PMA in the past, and whoever controls page 0 wins. On Mon, Feb 22, 2010 at 10:00 AM, Ed Finnell <efinnel...@aol.com> wrote: > > In a message dated 2/22/2010 7:16:52 A.M. Central Standard Time, > m42tom-ibmm...@yahoo.com writes: > > No. z/OS doesn't run Unix underneath it. Rather, the Unix API's are > incorporated in z/OS. > > > >> > It may be in some old SHARE presentations, but Multi-system's Test > used to run VM under MVS and more MVS's under VM according to Peter B. > Saergant. The purpose was to drive the hardware as hard as possible and > see > how it recovered in various scenarios. There was also a CMS under MVS( Sam > Lapore, RATSO SHARE Project), internal CLIST compiler(CLIQ) that's still > on > the shelf in Armonk for 'Marketing Reasons'. > > > > > ---------------------------------------------------------------------- > 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 > -- George Henke (C) 845 401 5614 ---------------------------------------------------------------------- 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
