Printing Aggregations
By default, multiple aggregations are displayed in the order they are introduced in the D program. You can override this behavior using the printa
() function to print the aggregations. The printa
() function also enables you to precisely format the aggregation data using a format string, as described in Output Formatting in DTrace.
If an aggregation is not formatted with a printa
statement in your D program, the dtrace
command will snapshot the aggregation data and print the results after tracing has completed using the default aggregation format. If a given aggregation is formatted using a printa
statement, the default behavior is disabled. You can achieve equivalent results by adding the statement printa(@
{_}aggregation-name{_})
to a dtrace:::END
probe clause in your program. The default output format for the avg
, count
, min
, max
, and sum
aggregating functions display an integer decimal value corresponding to the aggregated value for each tuple. The default output format for the lquantize
and quantize
aggregating function displays an ASCII table of the results. Aggregation tuples are printed as if trace
had been applied to each tuple element.