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What if ‘msgsize’ takes on a number of values
throughout the execution of the program and for each value a number
of runs is performed? How would one log the median of each set of
data? Using ‘THE msgsize’ won’t work because the
message size is not constant. Using ‘msgsize’ alone
won’t work either because coNCePTuaL would then take the median of
the times gathered across all message sizes, which is
undesirable. The solution is for the program to specify explicitly
when aggregate functions ( MEDIAN
and all of the other
functions listed in Aggregate
functions) compute a value:
<flush_stmt> | ::= | <source_task> |
COMPUTES
AGGREGATES |
The intention is that an inner loop might LOG
data after every iteration and
an outer loop would ‘COMPUTE AGGREGATES’ after each
iteration.