On Sat, Feb 19, 2011 at 12:17 AM, Les Koehler <vmr...@tampabay.rr.com> wrote: > Is a logical cpu equivalent to a physical cpu? I realize that the h/w now > has multiple physical cpus, but I was brought up on System/360 and never > have quite grokked how it is all controlled and accounted for!
z/VM itself runs in an LPAR under control of PR/SM. And just like z/VM does for virtual machines, PR/SM will dispatch the LPAR's logical CPUs on any physical CPU as it sees fit. Even when you have a dedicated CPU, it's PR/SM who decides which physical CPU is dedicated to that logical CPU (for almost all the time). And we're not even talking about hot-sparing of CPUs.... You're in a maze and all CPUs look the same .... ;-) Rob -- Rob van der Heij Velocity Software http://www.velocitysoftware.com/
