$ZHOROLOG
Synopsis
$ZHOROLOG $ZH
Description
$ZHOROLOG contains the number of seconds that have elapsed since the most recent Caché startup. This is a count, which is independent of clock changes and day boundaries. The value is expressed as a floating point number, indicating seconds and fractions of a second. The number of decimal digits is platform-dependent. $ZHOROLOG truncates trailing zeros in this fractional portion.
This special variable cannot be modified using the SET command. Attempting to do so results in a <SYNTAX> error.
Because of a limitation in the Windows operating system, putting your Windows system into hibernate or standby mode may cause $ZHOROLOG to return unpredictable values. This problem does not affect $HOROLOG or $ZTIMESTAMP values.
Examples
This example outputs the current $ZHOROLOG value.
WRITE $ZHOROLOG
returns a value such as: 1036526.244932.
The following example shows how you might use $ZHOROLOG to time events and do benchmarks. This example times an application through 100 executions, then finds the average runtime.
Cycletime
SET start=$ZHOROLOG
FOR i=1:1:100 { DO Myapp }
SET end=$ZHOROLOG
WRITE !,"Average run was ",(end-start)/100," seconds."
QUIT
Myapp
WRITE !,"executing my application"
; application code goes here
QUIT
See Also
$HOROLOG special variable
$ZTIMESTAMP special variable