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我在 Windows 上使用 boost::asio 进行了一个非常简单的服务器/客户端性能测试，它的性能似乎真的很差。我希望我只是错误地使用了图书馆，并希望得到任何建议。

我有一个会话类，它写入一个消息长度然后写入一条消息，然后等待读取一个消息长度然后读取一条消息，并且不停地一遍又一遍地这样做。但是，当我在自己的计算机上本地运行它时，我会获得极快的性能；当我在一台计算机上运行服务器并在另一台计算机上运行客户端时，即使在同一网络上，性能也会变慢，读/写操作需要多达 1 秒的时间。

服务器源代码文件如下：

#include <cstdlib>
#include <iostream>
#include <boost/asio.hpp>
#include <boost/bind.hpp>

using namespace boost;
using namespace boost::asio;
using namespace boost::asio::ip;
using namespace std;

class Session {
  public:

    Session(io_service& ioService)
      : m_socket(ioService) {}

    tcp::socket& GetSocket() {
      return m_socket;
    }

    void StartRead() {
      m_messageSizeIterator = reinterpret_cast<char*>(&m_messageSize);
      async_read(m_socket, buffer(m_messageSizeIterator, sizeof(m_messageSize)),
        bind(&Session::HandleSizeRead, this, placeholders::error,
        placeholders::bytes_transferred));
    }

    void StartWrite(const char* message, int messageSize) {
      m_messageSize = messageSize;
      m_message = new char[m_messageSize];
      memcpy(m_message, message, m_messageSize);
      async_write(m_socket, buffer(&m_messageSize, sizeof(int)),
        bind(&Session::HandleSizeWritten, this, placeholders::error));
    }

    void HandleSizeRead(const system::error_code& error,
        size_t bytes_transferred) {
      if(!error) {
        m_message = new char[m_messageSize];
        async_read(m_socket, buffer(m_message, m_messageSize),
          bind(&Session::HandleMessageRead, this, placeholders::error,
          placeholders::bytes_transferred));
      } else {
        delete this;
      }
    }

    void HandleMessageRead(const system::error_code& error,
        size_t bytes_transferred) {
      if(!error) {
        cout << string(m_message, m_messageSize) << endl;
        async_write(m_socket, buffer(&m_messageSize, sizeof(int)),
          bind(&Session::HandleSizeWritten, this, placeholders::error));
      } else {
        delete this;
      }
    }

    void HandleSizeWritten(const system::error_code& error) {
      if(!error) {
        async_write(m_socket, buffer(m_message, m_messageSize),
          bind(&Session::HandleMessageWritten, this, placeholders::error));
      } else {
        delete this;
      }
    }

    void HandleMessageWritten(const system::error_code& error) {
      if(!error) {
        delete m_message;
        m_messageSizeIterator = reinterpret_cast<char*>(&m_messageSize);
        async_read(m_socket, buffer(m_messageSizeIterator,
          sizeof(m_messageSize)), bind(&Session::HandleSizeRead, this,
          placeholders::error, placeholders::bytes_transferred));
      } else {
        delete this;
      }
    }

  private:
    tcp::socket m_socket;
    int m_messageSize;
    char* m_messageSizeIterator;
    char* m_message;
};

class Server {
  public:

    Server(io_service& ioService, short port)
        : m_ioService(ioService),
          m_acceptor(ioService, tcp::endpoint(tcp::v4(), port)) {
      Session* new_session = new Session(m_ioService);
      m_acceptor.async_accept(new_session->GetSocket(), bind(&Server::HandleAccept,
        this, new_session,asio::placeholders::error));
    }

    void HandleAccept(Session* new_session, const system::error_code& error) {
      if(!error) {
        new_session->StartRead();
        new_session = new Session(m_ioService);
        m_acceptor.async_accept(new_session->GetSocket(), bind(
          &Server::HandleAccept, this, new_session, placeholders::error));
      } else {
        delete new_session;
      }
    }

  private:
    io_service& m_ioService;
    tcp::acceptor m_acceptor;
};

int main(int argc, char* argv[]) {
  try {
    if(argc != 2) {
      cerr << "Usage: server <port>\n";
      return 1;
    }
    io_service io_service;
    Server s(io_service, atoi(argv[1]));
    io_service.run();
  } catch(std::exception& e) {
    cerr << "Exception: " << e.what() << "\n";
  }
  return 0;
}

客户端代码如下：

#include <cstdlib>
#include <cstring>
#include <iostream>
#include <boost/bind.hpp>
#include <boost/asio.hpp>

using namespace boost;
using namespace boost::asio;
using namespace boost::asio::ip;
using namespace std;

class Session {
  public:

    Session(io_service& ioService)
      : m_socket(ioService) {}

    tcp::socket& GetSocket() {
      return m_socket;
    }

    void StartRead() {
      m_messageSizeIterator = reinterpret_cast<char*>(&m_messageSize);
      async_read(m_socket, buffer(m_messageSizeIterator, sizeof(m_messageSize)),
        bind(&Session::HandleSizeRead, this, placeholders::error,
        placeholders::bytes_transferred));
    }

    void StartWrite(const char* message, int messageSize) {
      m_messageSize = messageSize;
      m_message = new char[m_messageSize];
      memcpy(m_message, message, m_messageSize);
      async_write(m_socket, buffer(&m_messageSize, sizeof(int)),
        bind(&Session::HandleSizeWritten, this, placeholders::error));
    }

    void HandleSizeRead(const system::error_code& error,
        size_t bytes_transferred) {
      if(!error) {
        m_message = new char[m_messageSize];
        async_read(m_socket, buffer(m_message, m_messageSize),
          bind(&Session::HandleMessageRead, this, placeholders::error,
          placeholders::bytes_transferred));
      } else {
        delete this;
      }
    }

    void HandleMessageRead(const system::error_code& error,
        size_t bytes_transferred) {
      if(!error) {
        cout << string(m_message, m_messageSize) << endl;
        async_write(m_socket, buffer(&m_messageSize, sizeof(int)),
          bind(&Session::HandleSizeWritten, this, placeholders::error));
      } else {
        delete this;
      }
    }

    void HandleSizeWritten(const system::error_code& error) {
      if(!error) {
        async_write(m_socket, buffer(m_message, m_messageSize),
          bind(&Session::HandleMessageWritten, this, placeholders::error));
      } else {
        delete this;
      }
    }

    void HandleMessageWritten(const system::error_code& error) {
      if(!error) {
        delete m_message;
        m_messageSizeIterator = reinterpret_cast<char*>(&m_messageSize);
        async_read(m_socket, buffer(m_messageSizeIterator,
          sizeof(m_messageSize)), bind(&Session::HandleSizeRead, this,
          placeholders::error, placeholders::bytes_transferred));
      } else {
        delete this;
      }
    }

  private:
    tcp::socket m_socket;
    int m_messageSize;
    char* m_messageSizeIterator;
    char* m_message;
};

int main(int argc, char* argv[]) {
  try {
    if(argc != 3) {
      cerr << "Usage: client <host> <port>\n";
      return 1;
    }
    io_service io_service;
    tcp::resolver resolver(io_service);
    tcp::resolver::query query(tcp::v4(), argv[1], argv[2]);
    tcp::resolver::iterator iterator = resolver.resolve(query);
    Session session(io_service);
    tcp::socket& s = session.GetSocket();
    s.connect(*iterator);
    cout << "Enter message: ";
    const int MAX_LENGTH = 1024;
    char request[MAX_LENGTH];
    cin.getline(request, MAX_LENGTH);
    int requestLength = strlen(request);
    session.StartWrite(request, requestLength);
    io_service.run();
  } catch (std::exception& e) {
    cerr << "Exception: " << e.what() << "\n";
  }
  return 0;
}

任何帮助将不胜感激，谢谢。

就我的目的而言，发送非常小的消息并想要虚拟实时回复，禁用 Nagle 的算法原来是性能不佳的原因。

4

2 回答 2

40

您必须关闭Nagle 算法。称呼：

m_socket.set_option(tcp::no_delay(true));

适合您的代码的地方。

于 2010-01-11T01:08:57.733 回答
6

就我的目的而言，发送非常小的消息并想要虚拟实时回复，禁用 Nagle 的算法原来是性能不佳的原因。

于 2010-01-11T01:05:11.750 回答