C++ grpc同步服务器限制句柄线程

我使用grpc cpp示例“HelloWorld”代码来测试限制句柄线程。但是我找不到任何方法来做

grpc版本：1.15

linux:ubuntu 16.04

我将生成器设置为：

builder.SetSyncServerOption(ServerBuilder::SyncServerOption::MIN_POLLERS, 1);
builder.SetSyncServerOption(ServerBuilder::SyncServerOption::MAX_POLLERS, 1);
builder.SetSyncServerOption(ServerBuilder::SyncServerOption::NUM_CQS, 1);

class GreeterServiceImpl final : public Greeter::Service {
  Status SayHello(ServerContext* context, const HelloRequest* request,
                  HelloReply* reply) override {
    std::string prefix("Hello ");
    std::cout << "start " << std::this_thread::get_id() << std::endl;
    reply->set_message(prefix + request->name());

    //**** sleep 5s, keep this thread block ****
    std::this_thread::sleep_for(std::chrono::seconds(5));

    std::cout << "end " << std::this_thread::get_id() << std::endl;
    return Status::OK;
  }
};

如下所示设置手柄：

builder.SetSyncServerOption(ServerBuilder::SyncServerOption::MIN_POLLERS, 1);
builder.SetSyncServerOption(ServerBuilder::SyncServerOption::MAX_POLLERS, 1);
builder.SetSyncServerOption(ServerBuilder::SyncServerOption::NUM_CQS, 1);

class GreeterServiceImpl final : public Greeter::Service {
  Status SayHello(ServerContext* context, const HelloRequest* request,
                  HelloReply* reply) override {
    std::string prefix("Hello ");
    std::cout << "start " << std::this_thread::get_id() << std::endl;
    reply->set_message(prefix + request->name());

    //**** sleep 5s, keep this thread block ****
    std::this_thread::sleep_for(std::chrono::seconds(5));

    std::cout << "end " << std::this_thread::get_id() << std::endl;
    return Status::OK;
  }
};

class GreeterServiceImpl final:公共问候者：：服务{
状态SayHello（ServerContext*context，const HelloRequest*request，
HelloReply*回复）覆盖{
字符串前缀（“Hello”）；
std:：cout您正在使用的是sync API，它将在每次调用时启动一个线程。您可以查看异步API以减少线程数。
您可以通过以下方式使用SetMaxThread：

grpc::ResourceQuota rq;
rq.SetMaxThreads(n);
builder.SetResourceQuota(rq);

似乎每个完成队列都需要一个线程，所以当您有一个完成队列时，如果n=4，则剩下3个线程用于处理请求