My guess is that this VM system is second level (probably under LPAR, but a host VM would yield the same). The involuntary CPU waits imposed by the first level (LPAR or CP) is not known to IND LOAD, it is taken as busy. If the first level host decides your zVM gets e.g. 50% of the entire system, and this zVM want to use 50% or more: IND LOAD will display 100% busy as the zVM never places itself in voluntary wait. Logically your zVM system is indeed 100% busy (it cannot execute more instructions than it currently does); physically it gets 50%. And, if you sum up what is used in zVM, you will get at 50% indeed.
I don't know the HMC monitor enough to know if you can see logical and physical CPU busy for an LPAR. When the entire system is not heavily loaded, and capping isn't turned on, then the difference between logical and physical CPU usage is small. Maybe this system got a bit more load making that the involuntary waits are no longer neglectable. 2008/11/24 [EMAIL PROTECTED] <[EMAIL PROTECTED]> > There is no perfomance monitor. I had written a rexx procedure which issues > an IND USER for each machine every minute and calculates from the difference > to the value of the minute before the cpu consumption for this single > machine. IBM in Germany (in Person Hans Joachim Ebert, meanwhile a retired > VSE/CICS expert from IBM Munich) has compared the values from my procedure > with a real monitor and it was nearly the same. The result of this procedure > is that the added cpu consumption of the measured users is not more than > 50%. > > The main purpose for this procedure was to get an estimate of the cpu usage > if customers have no monitor. So unfortunately I cannot look into details. > > kind regards > Franz Josef Pohlen > > > > Rich Smrcina schrieb: > > Do you have a performance monitor that can help you narrow down if a >> specific VSE machine is the culprit? >> >> [EMAIL PROTECTED] wrote: >> >>> Hello listers, >>> >>> I have installed zVSE 4.1.1 und zVM 5.3 (Level 0703) at a customer where >>> we replaced vm/vtam with an additional 4th zVSE machine with only vtam >>> running for cross-domain between three zVSE4 systems. Before the change of >>> the environment the customer was on zVSE 4.1.0. >>> >>> The added cpu consumption of the running guests is between 40-50% but the >>> IND LOAD and the activity on HMC shows permanently between 85 and 100% cpu >>> usage. This creates of course massive performance problems. >>> >>> I have no clue what process(es) may create this additional load. We have >>> restarted the zVM but it didn't help. If you put e. g. a batch job on the >>> zVSE the cpu load of the zVSE rises as expected to 30-50% and the the vm >>> load as indicated by IND LOAD is between 85 and 100%. Except of the >>> production VSE the load of the other machines including VM tcpip, FTPSERVE >>> and any others can be almost neglected (in sum below 10%). >>> There are no error msgs from hardware which could explain such a >>> behaviour. >>> >>> For documentation I have attached the user direct entries of the vse >>> systems, the system config, the autolog profile and the cms profile of the >>> VSE systems. >>> >>> Has anybody experienced such a behaviour of zVM and an idea where to look >>> for the error. I know that the IND LOAD cpu value is rounded over a period >>> of time, but I have never seen a difference greater than 5 - 10% to the >>> added cpu% of the running systems. >>> >>> >> >> -- Kris Buelens, IBM Belgium, VM customer support
