Distribution Graph
In data processing, frequency of occurrence of conditions generally cluster around a certain set of values. For this reason, distribution can be normalized; this is the default. The horizontal axis shows the percentage of CPU busy time. The vertical axis shows the percentage of time that the CPU had a specific percentage of activity. A range of 0 to 50%, in 5% increments, is displayed if the greatest percentage of occurrence is below 50%.
The first fill character is used for all measures, no matter how many measures are requested.
A sample Distribution Graph for CPU usage is shown in the following figure.
BMC SOFTWARE, INC. XYZ COMPANY REPORT DATE: DD MMM YY 9.33
ACTL 10 JUN YY 06.45.01 10 JUN YY 07.45.00 WORLDWIDE HEADQUARTERS SYSTEM ID: SYSB Z v.rr.n
P E R C E N T S O F A C T I V I T Y
0 10 20 30 40 50 60 70 80 90 100
+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
50. . . . . . . . . . .
. . . . . . . . . . .
. . . . . . . . . . .
. . . . . . . . . . .
CPU ENVIRONMENT P . . . . . . . . . . .
REQUESTED: ALL 45. . . . . . . . . . .
E . . . . . . . . . . .
STANDARD . . . . . . . . . . .
DEVIATION = 18.8 R . . . . . . . . . . .
. . . . . . . . . . .
AVERAGE = 37 C 40. . . . . . . . . . .
. . . . . . . . . . .
MEDIAN = 32 E . . . . . . . . . . .
. . . . . . . . . . .
MODE = 25 N . . . . . . . . . . .
35. . . . . . . . . . .
T . . . . . . . . . . .
. . . . . . . . . . .
. . . . . . . . . . .
. . . . . . . . . . .
O 30. . . . . . . . . . .
. . . . . . . . . . .
F . . . . . . . . . . .
. . . . . . . . . . .
. . . . . . . . . . .
25. . . . . . . . . . .
O . . . *****. . . . . . . .
. . . *****. . . . . . . .
C . . . *****. . . . . . . .
. . . *****. . . . . . . .
C 20. . . *****. . . . . . . .
. . . *****. . . . . . . .
U . . . ********** . . . . . . .
. . . ********** . . . . . . .
R . . . ********** . . . . . . .
15. . . ********** . . . . . . .
R . . . ********** . . . . . . .
. . . ********** . . . . . . .
E . ***** . ********** . . . . . . .
. ***** . ********** . . . . . . .
N 10. ***** . ********** . . . . . . .
. ***** . ********** . . . . . . .
C . ***** . ********** . . . . . . .
. ***** . ********** . . . . . . .
E . ************************* ********************. **********. . .
5. ************************* ********************. **********. . .
. ************************* ********************. **********. . .
. ************************* ********************. **********. . .
. ************************* ********************. **********. . .
. ************************* ********************. **********. . .
0+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
As shown, the CPU was never below 10% busy during the reporting period nor greater than 80% busy. A quarter of the time, the CPU was 25% to 30% busy.
A plateau in the graph represents an accumulated percentage of occurrence. The CPU ran at an accumulated busy rate of 40% to 60%, as shown in the example. The CPU ran at this rate 24% of the time, not 6% of the time.
Distribution Graph field descriptions
The table below describes each field in the Distribution Graph.
Field | Description |
|---|---|
CPU ENVIRONMENT REQUESTED: | CPU number or numbers selected in the GRAPH or WLMGRAPH control statement |
STANDARD DEVIATION = | standard deviation arrived at in calculating percentage of CPU busy time |
AVERAGE | average value arrived at in calculating percentage of CPU busy time |
MEDIAN = | median value arrived at in calculating percentage of CPU busy time |
MODE = | indicates the recording mode under which the records were extracted |
PERCENT OF OCCURRENCE | axis showing percentage of time that the measurement was at the indicated value |
PERCENTS OF ACTIVITY | axis representing percentage of measured activity during the interval Each column represents a normalized value, showing a grouping of measurement values (see breakdown in the description of the report). |