Alan Altmark writes: > On Tue, 2002-09-10 at 16:23, Phil Payne wrote: > > > This was forwarded to me by a co-worker. It's interesting, and sort > of > > > echoes IBM's experience with 64-bit Linux on zSeries. IBM mainframes > have a > > > maximum of 16 processors per box, but they also saw linear scalability > when > > > running a 2.4 kernel in 64-bit mode. This is very nice verification > of > > > those results. > > > > I didn't think Linux supported a 16-way image. > > I would be remiss if I didn't point out that IBM only *sells* boxes with a > maximum of 16 CPUs. That is not an architectural maximum of zSeries. > Consider that z/VM guest virtual machines can have a maximum of 64 virtual > CPUs (again, an implementation limit , not architeture)! Granted, it > isn't useful to have more virtual CPUs than you have real ones, but I just > don't want anyone to get the idea that mainframes have some sort of > inherent CPU limit.
I can confirm that a Linux guest (RedHat 7.1 s390x) boots OK with 32 CPUs (virtual ones) under z/VM 4.3. What amused me was that when I ran "top" it only had room to show 3 or 4 process lines at the bottom because the whole top section was taking 20 or so lines showing the per-CPU usage information. --Malcolm -- Malcolm Beattie <[EMAIL PROTECTED]> Linux Technical Consultant IBM EMEA Enterprise Server Group... ...from home, speaking only for myself
