>It's this quote that's driving this problem >"z/OS handles many address spaces very well." > >It's far less wonderful at handling them (at least in our experience) when >the machine is busy.
On the contrary, I assert that it handles them extraordinarily well. Is there another operating system that can operate anywhere near 100% busy? If your reason for thinking "less wonderful" is because you are not getting enough CPU time when the system is busy, then consider blaming the WLM settings that your site set which have deemed your application not worthy of a larger share. >I agree that limiting the number of dispatchable units of work (TCB's) to >the number of CPs is not particularly useful. You may agree, but I believe that you are mostly incorrect. Once it is asserted that the tasks do not wait (which I believe was asserted), you cannot get much more work out of 11 TCBs than 10 TCBs if there are only 10 CPUs. You certainly cannot have them all run at the same time. Yes, if one task is waiting for a page fault to be resolved, you could have another one do some work. But that all presumes that you are the only user of the LPAR, otherwise other work will be competing with you to run. Peter Relson z/OS Core Technology Design
