IBM does publish "service units per second of task time" for a number of
IBM zSeries systems in the "MVS Initialization and Tuning Guide",
available off of the IBM z/OS library web site. These values can be
converted, with some unknown degree of validity, to MSU values, via the
following formula:
MSU = SU*P*3600/1000000
where "SU" is the service units per second mentioned above and "P" is
the number of physical processors in the system.
A very rough measurement of the MIPS provided per physical processor can
be calculated from:
MIPS = SU/48.5
and total MIPS from
total_MIPS = MIPS * P
These are all rough approximations or rules of thumb....use at your own
risk. ;-)
Thomas Kern wrote:
Does IBM document the conversion algorithm for the MVS CPU to Service
Units? If they do, we could do the computation for ourselves.
/Tom Kern
Schuh, Richard wrote:
As far as I know, there never has been a defined measurement known as a
"service unit" on VM; therefore, no way to convert from anything else to
service units. If you want to define a service unit as n cpu seconds,
then the conversion is straightforward.
Regards, Richard Schuh
-----Original Message-----
From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On
Behalf Of Dave Jones
Sent: Tuesday, November 27, 2007 7:00 AM
To: [email protected]
Subject: Re: CPU adjustment rate
Hi, Tobias.
The short answer is no, there is no such conversion field in VM
itself. Of course, if you are running a guest like MVS under VM, that
support
such a conversion, then that conversion will still work.
Hope this helps.
Tobias Doerkes wrote:
Hi list.
As far as i know VM only gives information about CPU usage by used CPU
seconds. In MVS there is a so called CPU adjustment rate
(rmctadjc) to convert CPU seconds into service units. Is there an
aquivalent field in VM control blocks?
Regards, Tobias Doerkes
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