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CPU Rule Analysis Report

The following example shows a CPU Rule analysis:

Full Analysis                 SUPPLY (VAX-11/780)                       Page   2
PA Vx.x
Saturday 01-OCT-2006 00:00 to 23:59
CONCLUSION 2.							{C0010}
There is an apparent bottleneck at the CPU due to the large number of COM/COMO processes.  There exists
higher priority process(es) which are  causing  lower priority  COM  and/or  COMO processes to wait for
the CPU which may be the cause of the problem.   This  is considered a LOCKOUT condition. Examine and or
review process priorities.   For an equitable distribution  of  CPU  time  over  the COM processes, be
sure they all have the same BASE PRIORITY.
Total number of samples giving this conclusion:  4
CONDITIONS
1. COMPUTABLE_PROCESSES .GE. 5.00 * COM_SCALING 
2. PRIORITY_LOCKOUT .EQ. 1.00 
3. TOP_CPU_PROC_CPU .GT. 7.00 4. OCCURRENCES .GE. 4
EVIDENCE
# Proc     Process receiving most CPU        COM Process 
in COM   --------------------------------   ----------------     Time of 
or COMO  USERNAME     IMAGE     %CPU PRIB  USERNAME     PRIB    occurrence 
------   ------------ --------- ---- ----  ------------ ----  ---------------- 
     1      2           3          4    5    6             7            8      
     8   SMITH        GAME        83    8  JONES           4    1-OCT 00:04:00 
    20   JOHN         TIME        83    8  DOE             4    1-OCT 00:06:00 
    20   TOM          LIFE        83    8  MACK            4    1-OCT 00:08:00 
    20   JERRY        MEGA        83    8  HALL            4    1-OCT 00:10:00

The following statements are keyed to the columns in the previous CPU Rule analysis report:

1. Average number of processes in computable or computable outswapped state during the interval.
2. User name string of the process that consumed the most CPU time during the interval.
3. The first 12 characters of the image name.
4. Percentage of the total available CPU time consumed by the user's process during the interval.
5. Base priority of the process that used the most CPU time during the interval.
6. User name string for the process that was in the computable state most during the interval.
7. Base priority of the process that was in the computable state most during the interval.
8. Beginning time of the interval in which the condition occurred.

In the previous CPU Rule analysis report example, the average number of processes in either COM or COMO state is five or greater on four occasions, with the actual number of COM/COMO processes ranging from 8 to 20. These blocked computable processes (for users Jones, Doe, Mack, and Hall) each have a base priority of 4. Other processes with a base priority of 8 (for users Smith, John, Tom, and Jerry) prevent the other computable processes from executing because of their elevated base priority, thereby creating the LOCKOUT condition.