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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.

Figure 1. NUMBER OF 4-HOUR PERIODS field example

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.

 

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