David, On the SDSF DA panel the fields CPU/L/Z are as follows: CPU ( SDSF help calls this MVS busy) this is the percentage busy the the z/OS operating system thinks it is busy. This includes both the time the logical CP is running plus the time the logical CP is not in a wait state and is waiting for PR/SM to dispatch it. This is because another LPAR is running. L (SDSF help call this LPAR busy) this is the logical CP is running. This is the correct CPU utilisation of the LPAR. Z (SDSF help calls this zAAP busy) this is the zAAP busy percent if you have one. To explain the first two let me sketch a diagram: =================================================> time A B C <====Logical CP running ===> <==== Logical CP running ====> xxxx If during the whole time z/OS has work to run the MVS busy would be the whole time (A + B + C). LPAR busy would be the whole time less the xxxx part (A + C). The xxxx part is when other LPARs have control the real CPU (C). The bigger the difference between MVS busy and LPAR busy the more your work is being delayed by other LPARs. If this is you main production system them you should look at increasing this LPAR's weight. You owe me a pint for this quick course. Just joking.
Terry Draper zSeries Performance Consultant [email protected] mobile: +966 556730876 --- On Wed, 5/8/09, David Speake <[email protected]> wrote: From: David Speake <[email protected]> Subject: SDSF DA fields CPU/L/Z/ To: [email protected] Date: Wednesday, 5 August, 2009, 12:02 AM SDSF DA displays a line of information above the 'COMMAND INPUT' line. SDSF DA SYSJ (ALL) PAG 0 CPU/L 68/ 34 LINE 1-1 (1) Can anyone point me to an IBM manual for citation as to exactly what CPU/L 68/ 34 in the above mean. The Help panel shows CPU/L/Z/ 26/ 26/ 0 | Percentage of time the CPU is busy, MVS, LPAR and zAAP views. The zAAP view would, I guess, reflect busy % for all CPUs (if any) designated as zAAP processors by PR/SM. But what is the definition/distinction for CPU/L (MVS/LPAR) views. I am looking at z/OS: Resource Measurement Facility Performance Management Guide, B.4.2 Value of LPAR CPU management and I cannot form a good definition. An explanation would be appreciated. A definition citation even more so. David ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
