sclass MultiBencher {
  settable Runnable action;
  settable double seconds = 10;
  settable double interval = 0.001;
  double elapsedSeconds;
  
  new L<BenchForNSeconds> benchers;
  
  run {
    ensureCapacity(benchers, doubleRatio(seconds, interval)+2);
    long start = nanoTime(), endTime = lround(start+secondsToNanos(seconds));
    while (nanoTime() < endTime) {
      var bencher = addAndReturn(benchers, new BenchForNSeconds(interval, action));
      bencher.run();
    }
  }
}