YCSB-throttle.java

private void throttleNanos(long startTimeNanos) {
	//throttle the operations
	if (_targetOpsPerMs > 0)
	{
	    // delay until next tick
	    long deadline = startTimeNanos + _opsdone*_targetOpsTickNs;
	    sleepUntil(deadline);
	    _measurements.setIntendedStartTimeNs(deadline);
	}
}