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Rolling 4-Hour MSU Usage Distribution Section

This section shows the distribution of four-hour MSU per hour usage for the busiest 10% of rolling four-hour periods.

If a partition does not have a defined capacity, this section helps you determine the partition value. For the listed MSU values, BMC AMI Ops Monitor for CMF calculates the expected percent of time that soft capping is in effect for the partition if the defined capacity is set to one of these MSU values. To use this section, decide what percentage of time is acceptable for Workload Manager to cap the partition, and then look for that percentage on the PROJECTED % CAPPED BY WLM line. The MSUs line shows the MSU value to be used for the defined capacity.

Related topic

CPU-Utilization-Report


Example
MSUs                                                   33    
                                                   -----   
% OF 4-HOUR PERIODS USING MORE THAN THE CONSUMED MSU    0.4    
PROJECTED % CAPPED BY WLM                               0.8

In this example, 0.4% of four-hour periods consumed more than 33 MSU per hour. If the defined capacity is set at 33 MSU per hour, it is projected that the partition is capped by Workload Manager 0.8% of the time. In other words, if you would like the partition to be capped 0.8% of the time, set the defined capacity of the partition at 33 MSU per hour.

If a partition already has defined capacity, you can adjust its value by using this section and the % Capped by WLM column ( % WLM) in the Partition Data Section.

Calculation method for PROJECTED % CAPPED BY WLM

Every five minutes, Workload Manager calculates the MSU per hour usage averaged over the previous four-hour period. If the average exceeds the defined capacity, the partition is capped for the next five minutes; that is, it can only use as much CPU as set by defined capacity. At the end of this (next) five-minute period, Workload Manager calculates the four-hour average again. If it drops below defined capacity, the capping is removed; otherwise, the partition stays capped.

Similarly, CMF calculates the four-hour MSU per hour average for the end of every recording interval n. If the average exceeds the tentative defined capacity, the partition is considered capped for the entire length of the next recording interval n+1. (If the partition used more than the defined capacity in this next interval, the excess usage is charged to the following interval n+2.) At the end of the recording interval n+1, CMF calculates the four-hour average again. If it drops below tentative defined capacity, the partition is no longer considered capped.

An example of the Rolling 4-Hour MSU Usage Distribution Section of the CPU Utilization Report is shown in the following figure.

PRODUCED BY CMF ANALYZER (v.r.mm  RSL yymm )            CPU UTILIZATION REPORT                          RPTSEQ     3 PAGE     14
 BMC SOFTWARE, INC.                                        BMC SOFTWARE, INC.                            REPORT DATE: 10 SEP 16 23.21
 ACTL 04 SEP 16 11.30.00  08 SEP 16 15.00.01                  HOUSTON, TX.                               SYSTEM ID: SJSC     Z 2.02.0


 BASED ON REC TYPE/# RECS/# SAMPLES/REC HOURS:  70-1/396/356K/98.79
-----------------------------------------  ROLLING 4-HOUR MSU USAGE DISTRIBUTION SECTION  ------------------------------------------
CPU FAMILY: 2964  VERSION: 00  MODEL: 514               CEC CAPACITY =  1,000

 PARTITION = SJSC       NUMBER OF 4-HOUR PERIODS =     334
    CONSUMED MSU                                             98     95     92     89     86     83     80     77     74     71
                                                          -----  -----  -----  -----  -----  -----  -----  -----  -----  -----
    % OF 4-HOUR PERIODS USING MORE THAN THE CONSUMED MSU    2.1    3.3    3.9    4.2    4.8    5.1    5.7    6.3    6.6    6.9

    CONSUMED MSU                                             68     65     62     59     56     53     51
                                                          -----  -----  -----  -----  -----  -----  -----
    % OF 4-HOUR PERIODS USING MORE THAN THE CONSUMED MSU    7.5    7.8    8.4    8.7    9.3    9.6   10.2


 PARTITION = CF11       NUMBER OF 4-HOUR PERIODS =       0

 PARTITION = CF12       NUMBER OF 4-HOUR PERIODS =       0

 PARTITION = CF13       NUMBER OF 4-HOUR PERIODS =       0

 PARTITION = CF16       NUMBER OF 4-HOUR PERIODS =       0

 PARTITION = SJSB       NUMBER OF 4-HOUR PERIODS =     334
    CONSUMED MSU                                             23     22     21     20
                                                          -----  -----  -----  -----
    % OF 4-HOUR PERIODS USING MORE THAN THE CONSUMED MSU    0.6    4.5    8.7   14.4

 PARTITION = SJSD       NUMBER OF 4-HOUR PERIODS =     334
    CONSUMED MSU                                             63     62     61     60     59     58     57     56     55
                                                          -----  -----  -----  -----  -----  -----  -----  -----  -----
    % OF 4-HOUR PERIODS USING MORE THAN THE CONSUMED MSU    0.6    1.2    2.7    3.3    4.5    5.4    6.3    8.7   10.8

 PARTITION = SJSG       NUMBER OF 4-HOUR PERIODS =       0

 PARTITION = SJSH       NUMBER OF 4-HOUR PERIODS =     334
    CONSUMED MSU                                             39     38     37     36     35     34     33     32     31     30
                                                          -----  -----  -----  -----  -----  -----  -----  -----  -----  -----
    % OF 4-HOUR PERIODS USING MORE THAN THE CONSUMED MSU    0.3    0.9    1.8    1.8    3.3    5.1    6.3    6.3    6.9    7.2

    CONSUMED MSU                                             29
                                                          -----
    % OF 4-HOUR PERIODS USING MORE THAN THE CONSUMED MSU   10.2


 PARTITION = SYSI       NUMBER OF 4-HOUR PERIODS =       0

Calculating the number of 4-hour periods

The figure below and the steps that follow provide an example of the values and the calculation that determine the value of the NUMBER OF 4-HOUR PERIODS field in the Rolling 4-Hour MSU Usage Distribution Section of the CPU Utilization Report.

PRODUCED BY CMF ANALYZER (v.r.mm  RSL yymm )                       CPU UTILIZATION REPORT
BMC SOFTWARE, INC.                                           XYZ COMPANY.   
REQD 13 JUL 10 08.00.00  13 JUL 10 23.00.59           WORLDWIDE HEADQUARTERS
SHFT 00.00.00 23.59.00 DAYS=ALL                                                
ACTL 13 JUL 10 08.09.00  13 JUL 10 23.09.00


BASED ON REC TYPE/# RECS/# SAMPLES/REC HOURS:  240-1/90/107K/15  70-1/90/107K/15
-----------------------------------------  ROLLING 4-HOUR MSU USAGE DISTRIBUTION
CPU FAMILY: 2097  VERSION: 00  MODEL: 507               CEC CAPACITY =    340  

PARTITION = SJSB       
NUMBER OF 4-HOUR PERIODS =      67
   CONSUMED MSU                                            238    237    236   
                                                         -----  -----  -----   
   % OF 4-HOUR PERIODS USING MORE THAN THE CONSUMED MSU    3.0    7.5   13.4

To calculate the number of 4-hour periods

  1. Determine the total elapsed time of the report, taken from the REC HOURS value in the BASED ON line (15 in the example).
  2. Determine the number of recording intervals, taken from the # RECS value in the BASED ON line (90 in the example).
  3. Convert the total elapsed time to minutes: 15 hours * 60 minutes per hour = 900 minutes.
  4. Calculate the recording interval length = 900 minutes / 90 recording intervals = 10 minutes per interval.
  5. Calculate the number of recording intervals per hour = 60 minutes per hour / 10 minute interval = (6) 10-minute samples per hour.
  6. Calculate the number of hours following the first four hours: 15 - 4 = 11.
  7. Calculate the number of ten-minute recording intervals in 11 hours = (11 * 6) = 66.
  8. Add 1, representing the last reporting interval of the first four-hour period = 66 + 1 = 67.

The total is 67 4-hour periods.

Rolling 4-Hour MSU Usage Distribution Section field descriptions

The table below describes each field in the Rolling 4-Hour MSU Usage Distribution Section of the CPU Utilization Report.

Field

Description

CPU FAMILY VERSION MODEL

CPU family, version, and model

CEC CAPACITY

capacity of all CPs in millions of service units (MSUs) per hour

CPs are those available for MVS partitions.

PARTITION

partition name

NUMBER OF 4-HOUR PERIODS

number of recording intervals that occurred in the input data after the first four hours elapsed

CONSUMED MSU

MSUs per hour consumed by rolling four-hour periods

% OF PERIODS USING MORE THAN THE CONSUMED MSU

percentage of rolling four-hour periods that are using more than the consumed MSU

Important

CMF displays the MSU per hour values of the top 10% periods, not to exceed 20 values.

PROJECTED % CAPPED BY WLM

percentage of time projected to be capped by Workload Manager if the defined capacity equals the MSU amount

Important

This field is shown only if the partition does not have defined capacity.

 

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