Many VSE shops have been running on multiple processors for a long time. We first started it on the
4381. Adding virtual processors to VSE improves performance but not as much as most people expect.
With 2 processors you get about 180% of one processor. With 3 processors you get about 240%. More
than 3 processors gives very little if any improvement. I have not found that dedicating a processor
to VSE does any good. Others have done it.
My recommendation with several processors. Define multiple VSE guests and divide the workload among
them. Give each guest 2 virtual processors. Let VM decide how to dispatch the virtual processors on
the real processors.
These recommendations assume any VSE after about VSE/ESA 2.4 using the turbo dispatcher and a VM
after HPO. :)
Posted to both VM-L and VSE-L.
[EMAIL PROTECTED] wrote:
I picked this up from the VSE-L, but it is a good question for VM.
I think many VSE shops are seeing multiple processors for the first time
when they move to z-hardware and under VM it can be confussing as what
to do with 4 processors.
The question(s) arise.
1) Is anything gained by giving VSE more than 1 virtual CPU?
2) With only 4 to go around does dedicating processors to VSE make sense?
3) Would the answers be any different depending on the number of guest VSE?
Assume z/VM 5.2 and z/VSE 3.1
Thanks
--
Stephen Frazier
Information Technology Unit
Oklahoma Department of Corrections
3400 Martin Luther King
Oklahoma City, Ok, 73111-4298
Tel.: (405) 425-2549
Fax: (405) 425-2554
Pager: (405) 690-1828
email: stevef%doc.state.ok.us
