return new PrintingEventListener(callId, System.nanoTime());
      }
    };

    final long callId;
    final long callStartNanos;

    PrintingEventListener(long callId, long callStartNanos) {
      this.callId = callId;
      this.callStartNanos = callStartNanos;
    }

    private void printEvent(String name) {
      long elapsedNanos = System.nanoTime() - callStartNanos;

  static void delay(long millis) throws InterruptedException {
    long startTime = System.nanoTime();
    long ns = millis * 1000 * 1000;
    for (; ; ) {
      if (millis > 0L) {
        Thread.sleep(millis);
      } else {
        // too short to sleep
        Thread.yield();
      }
      long d = ns - (System.nanoTime() - startTime);
      if (d > 0L) {
        millis = d / (1000 * 1000);
      } else {

    peer.sendFrame().ping(true, Http2Connection.AWAIT_PING, 5)
    peer.play()

    // Play it back.
    val connection = connect(peer)
    val pingAtNanos = System.nanoTime()
    connection.writePingAndAwaitPong()
    val elapsedNanos = System.nanoTime() - pingAtNanos
    assertThat(elapsedNanos).isGreaterThan(0L)
    assertThat(elapsedNanos).isLessThan(TimeUnit.SECONDS.toNanos(1))

    Request request = chain.request();

    long t1 = System.nanoTime();
    logger.info(String.format("Sending request %s on %s%n%s",
        request.url(), chain.connection(), request.headers()));

    Response response = chain.proceed(request);

    long t2 = System.nanoTime();
    logger.info(String.format("Received response for %s in %.1fms%n%s",

    }
  }

  private fun ensureAllTaskQueuesIdle() {
    val entryTime = System.nanoTime()

    for (queue in TaskRunner.INSTANCE.activeQueues()) {
      // We wait at most 1 second, so we don't ever turn multiple lost threads into
      // a test timeout failure.
      val waitTime = (entryTime + 1_000_000_000L - System.nanoTime())
      if (!queue.idleLatch().await(waitTime, TimeUnit.NANOSECONDS)) {

            // In real implementation, this would send using DiSNI:
            // DisniMemoryRegion disniRegion = (DisniMemoryRegion) region;
            // IbvSendWR sendWR = new IbvSendWR();
            // sendWR.setWr_id(System.nanoTime());
            // sendWR.setOpcode(IbvSendWR.IbvWrOpcode.IBV_WR_SEND.ordinal());
            // sendWR.setSend_flags(IbvSendWR.IBV_SEND_SIGNALED);
            //
            // LinkedList<IbvSge> sgeList = new LinkedList<>();

            queryCommand.isSearchField(testField);
        }

        // Measure Set-based lookup
        long startTime = System.nanoTime();
        for (int i = 0; i < 10000; i++) {
            queryCommand.isSearchField(testField);
        }
        long duration = System.nanoTime() - startTime;

        // Should complete quickly (relaxed threshold for CI environments)

  static void delay(long millis) throws InterruptedException {
    long startTime = System.nanoTime();
    long ns = millis * 1000 * 1000;
    for (; ; ) {
      if (millis > 0L) {
        Thread.sleep(millis);
      } else {
        // too short to sleep
        Thread.yield();
      }
      long d = ns - (System.nanoTime() - startTime);
      if (d > 0L) {
        millis = d / (1000 * 1000);
      } else {

  }

  private static final class PrintingEventListener extends EventListener {
    long callStartNanos;

    private void printEvent(String name) {
      long nowNanos = System.nanoTime();
      if (name.equals("callStart")) {
        callStartNanos = nowNanos;
      }
      long elapsedNanos = nowNanos - callStartNanos;
      System.out.printf("%.3f %s%n", elapsedNanos / 1000000000d, name);
    }

   * - System.nanoTime() is expensive enough that we want to call it the minimum required number of
   *   times, typically once before invoking a blocking method. This often requires keeping track of
   *   the first time in a method that nanoTime() has been invoked, for which the special value 0L
   *   is reserved to mean "uninitialized". If timeout is non-positive, then nanoTime need never be
   *   called.