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Creating Monitor Pictures
A.3 Arithmetic Expressions and Operators
Aggregation of Data Items
DISPLAY commands which select multiple instances of a data item (for example,
multiple instances of a process counter) can use the following keywords to control
the way the items are aggregated.
_MIN—select the data item instance with the lowest value
_MAX—select the data item instance with the higheest value
By default, data items are totaled unless the
/AVERAGE=( )
qualifier is specified.
The following example from SYSTEM.MON shows the use of the _MIN keyword:
! Warn if any messages have been pending for more than 30 seconds
DISPLAY TEXT /X=32 /Y=17 -
"X" -
/BOLD -
/SELECT="...
((rtr:rtr_current_time - _MIN(prc:rtr_mt_received_time)) <= 30)"
DISPLAY TEXT /X=40 /Y=17 -
"X" -
/BOLD /BLINK -
/SELECT="...
((rtr:rtr_current_time - _MIN(prc:rtr_mt_received_time)) > 30)"
Some output has been omitted for clarity.
Creating Monitor Pictures A–5