什么决定了RPC服务器中的CQ数量？

Question

我在src / cpp / server / server_builder.cc中阅读了ServerBuilder :: BuildAndStart（）函数的代码，其中包括以下代码：

  // cqs_ contains the completion queue added by calling the ServerBuilder's
  // AddCompletionQueue() API. Some of them may not be frequently polled (i.e by
  // calling Next() or AsyncNext()) and hence are not safe to be used for
  // listening to incoming channels. Such completion queues must be registered
  // as non-listening queues
  for (auto it = cqs_.begin(); it != cqs_.end(); ++it) {
    grpc_server_register_completion_queue(server->server_, (*it)->cq(),
                                          nullptr);
  }

这意味着RPC服务器在初始化期间创建多个CQ。那么，什么决定了创建的CQ数量呢？每个CQ是否有必要处理来自每个不同客户端的请求？