java - why do we have to fix the duration for each measurement iteration? -

what timing iterations means ?

@measurement(iterations = 50, time = 2) 

should time of measurement fixed, if iteration of measurement takes longer 2 seconds, iteration stopped ? if true impact have on measurements.

the straightforward answer question is: "we have provide iteration time (or rely on default iteration time), because otherwise iteration never stop". depending on benchmark mode, meaning iteration time may different. example, javadoc says:

/**  * <p>throughput: operations per unit of time.</p>  *  * <p>runs continuously calling {@link benchmark} methods,  * counting total throughput on worker threads.   * mode time-based, , run until iteration  * time expires.</p>  */ throughput("thrpt", "throughput, ops/time"), 

there no way stop uncooperative execution in java, short of killing vm. (interrupting thread needs cooperation: there should check interruption). therefore, if @benchmark call takes longer requested iteration time, have no other option except waiting it.