Evaluate Performance in Detail › Histograms › Image Residence Histograms › CPU Utilization Histogram

CPU Utilization Histogram

The following example shows a CPU Utilization histogram:

Histograms                      DEMAND (VAX 8700)                       Page   1
							 PA Vx.x
Wednesday 01-OCT-2007 00:00 to 12:16

                                                       *--------------------*
                                                       |    Legend: 1       |
                                                       |                    |
                                                       | D  DECnet jobs     |
                                                       | I  interactive     |
                                                       | B  batch           |
                                                       | O  overhead        |
                                                       |    (swapper+netacp)|
                                                       | X  intrupt & mpsync|
                       CPU utilization                 | *  other           |
%used 2                  ---------------               *--------------------*
100 !                                           BBB
 95 !                                           BBB                       B
 90 ! D                                         BBB                       B
 85 ! BB                                        BBB                      BB
 80 ! BB                                        BBB                      BB
 75 ! BB                                        BBB                  B  BBB
 70 ! BB                                        BBB                  B  BBBB
 65 ! BB                                        BBB                  B  BBBB
 60 ! BB                                        BBB                  B  BBBB
 55 ! BB                                        BBB                  B  BBBB
 50 ! BBB                                       BBB                  B  BBBB
 45 ! BBB                                       BBB                  B  BBBB
 40 ! BBBB                                      BBB               II B  BBBB
 35 ! IBBB BB                                  BBBB               II BB BBBI
 30 ! IBBBBBB                                  BBBB               II BB BBBII
 25 ! IBBBBBB                                  BBBB             I II BBBBBBII
 20 ! IBBIBBB                                  BBBB            IIIIIBIIIIBBIII
 15 ! IBIIBBB                            B     BBBB        I   IIIIIIIIIIBIIII
 10 ! IIIIIIIB                           B     BBBB     IIIII IIIIIIIIIIIIIIII
  5 ! XXXXXXXB     B   B     B     B     B     XIBXI IXXXXXXXXXXXXXXXXXXXXXXXX
! -----01----02----03----04----05----06----07---08----09----10----11----12
                                                                         3
   Each Column represents approximately 10 minutes starting from
   1-OCT 00:00:00 to 1-OCT 12:16:44.  An "N" indicates NO DATA.

The following statements are keyed to the CPU Utilization histogram example:

1. Explanatory list of symbols in the histogram columns.
2. Percentage of CPU time used by categories of processes and system overhead.
3. Number of hours spanned by the reporting period. This histogram reflects a reporting period of 12 hours.