//
    // TODO(user): Consider scaling by number of mutator threads,
    // e.g. using Thread#activeCount()
    return max(10L, Runtime.getRuntime().totalMemory() / (32L * 1024L * 1024L));
  }

  /**
   * Waits until the given future {@linkplain Future#isDone is done}, invoking the garbage collector
   * as necessary to try to ensure that this will happen.
   *

      messageCount++
      val queueSize = webSocket.queueSize()
      assertThat(queueSize).isBetween(0L, messageCount * message.size)
      // Expect to fail before enqueueing 32 MiB.
      assertThat(messageCount).isLessThan(32L)
    }

    // Confirm all sent messages were received, followed by a client-initiated close.
    val server = serverListener.assertOpen()
    for (i in 0 until messageCount) {

    }

    static long readTime(final byte[] src, final int srcIndex) {
        final int low = readInt4(src, srcIndex);
        final int hi = readInt4(src, srcIndex + 4);
        final long t = (long) hi << 32L | low & 0xFFFFFFFFL;
        return t / 10000L - MILLISECONDS_BETWEEN_1970_AND_1601;
    }

    static void writeTime(long t, final byte[] dst, final int dstIndex) {
        if (t != 0L) {