User CPU Analysis

Specifics - User CPU utilization analysis:

Looking at CPU utilization for users, the following screens/reports can show quickly where to look for more details.

Helpful ESAMON screens/ESAMAP reports (further explained below):

ESAUSP2 - Shows user percentage utilization

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  • UserID/Class - This shows the classes and/or UserID's. Can click (zview) or zoom (z/VM) to see the all of the users in a class.
  • Processor use CPU% Total/Virtual/T:V Rat - This shows again how much CPU time the class/user is using. The highest user percentage is easily seen. ESALNXP can also be used if this is a linux user to see which processes are being run. Virtual time should be equal or close to the total CPU percent or there may be overhead issues.
  • % of LPAR CPU - This shows the percentage of total CPU and storage allocated to the LPAR for this user/class.
    • ESAUSP5 - Shows user SMT CPU percent utilization by user. See SMT Analysis for more information about performance with SMT active.

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  • CPU Percent Consumed Traditional Total/Virtual - This shows the time the CPU core was assigned and dispatched on a thread.
  • CPU Percent Consumed MT-Equivalent Total/Virtual - This shows the time if SMT was not enabled. This also shows the cost in response time.
  • CPU Percent Consumed IBM Prorated Total/Virtual - This shows (approximately) the cycles that were really used.
  • Total CPU VSI Prorated Total/Virtual - This shows the total prorated CPU busy percent as computed by Velocity.
    • ESAXACT - Shows transaction delay analysis.

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  • UserID/Class - This shows the machine user or user class. Can click on a line (zview) or zoom (z/VM) to see the all the users in the group.
  • Percent non-dormant CPU - This shows the percentage of time a user/server/class is waiting for CPU. The virtual machine (virtual processor) is ready and waiting to be dispatched to run but there is no physical processor currently available. A number over 20 is excessive. If a machine has a high CPU wait, check the ESAUSR2 report to compare its CPU use to the total CPU use. Check the CPU utilization for the system, the relative SHARE of the id and also check LPAR weights/overhead (See LPAR weights/overhead)
  • CPU% - This is the CPU percentage used by the class or user.
    • ESAUSRD - Shows virtual machine diagnose command count

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  • UserID/Class - This shows the machine user or user class. Can click on a line (zview) or zoom (z/VM) to see the all the users in the group.
  • Diagnose 044/09C - This shows the diagnose rate for users/classes. These two diagnose commands are indicative of spin locks. Diag 044 are more costly than 09C. Look at how many vCPUs are allocated to machines that have high 044/09C rates (over 100k) - too many vCPUs can cause excessive spin locks and are inefficient.
    • ESATOPU - This shows the top user consuming the most CPU for each minute. Helpful system information:

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  • Userid/Class - This shows for each minute the top consuming user. If this is a spike, as this picture shows, find out what happened and why this user/server is suddenly consuming so much of the system. In this case, it was a system programmer running a trace.
  • Total CPU time - This shows how much of the system is being utilized. It is easy to see the spike in this picture.
  • DASD I/O - This shows the DASD I/O in an interval. If the number shows as 0 and there is high CPU utilization, the user may be "looping" and should be checked/logged off.
    • ESAUSER - This allows for user-specific information to be shown for a particular user. Helpful system information:

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  • Each line has information about a particular user. This is a quick way to see the data from the above screens in one place for one user.
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