C# TCP 套接字性能在应用程序运行时下降
本文关键字：运行时 应用程序 TCP 套接字 性能 | 更新日期: 2023-09-27 18:32:34
我写了一个C#服务器应用程序。服务器使用异步 TCP 套接字。
数据包是 80-180 字节的数据。
对于性能测试，我有一个客户端连续连接和发送数据包。通过调试，大约 5 秒内收到前 100 个数据包 (0-100(。当服务器收到数据包 #300-400 时，大约需要 30 秒才能收到数据包。随着更多接收的发生，性能会继续下降。
我环顾四周，一直找不到解决方案。我尝试设置Socket.NoDelay标志，以防Nagle算法禁止服务器。
我已经禁用了服务器中的所有功能;因此它只是接收以确保我不会在其他代码中失去性能。
我还检查了我的 CPU 利用率，它是 ~13%。我有超过 2 GB 的可用内存。运行应用程序时，RAM 不会持续增长，利用率也很小。
我不知道接下来要调试和研究什么......
编辑：添加的代码示例
public void StartListening()
{
try
{
IPAddress ipAddress = IPAddress.Parse("192.168.2.60");
IPEndPoint localEndPoint = new IPEndPoint(ipAddress, m_Port);
m_MainSocket = new Socket(localEndPoint.Address.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
m_MainSocket.NoDelay = true;
m_MainSocket.Bind(localEndPoint);
m_MainSocket.Listen(10);
m_MainSocket.BeginAccept(new AsyncCallback(clientConnected), null);
System.Diagnostics.Debug.WriteLine("Listening on:Local IP Address: " + localEndPoint.Address.ToString() + " Port :" + localEndPoint.Port.ToString() + "'n");
}
catch (SocketException se)
{
System.Diagnostics.Debug.WriteLine("Listening Exception 'n");
System.Diagnostics.Debug.WriteLine(se.Message);
}
}
void clientConnected(IAsyncResult ar)
{
try
{
SocketState state = new SocketState(m_MainSocket.EndAccept(ar));
Client client = new Client(state);
if (client.SocketState.clientSocket.Connected)
{
System.Diagnostics.Debug.WriteLine("Client #?????? Connected 'n");
AddLogText("Client #?????? Connected 'r'n'r'n");
waitForData(client);
SetSendButton(true);
}
m_MainSocket.BeginAccept(new AsyncCallback(clientConnected), null);
}
catch (ObjectDisposedException)
{
System.Diagnostics.Debug.WriteLine("Client Connected: Socket has been closed'n");
}
catch (SocketException se)
{
System.Diagnostics.Debug.WriteLine("Client Connected Exception 'n");
System.Diagnostics.Debug.WriteLine(se.Message);
}
}
void waitForData(Client client)
{
try
{
SocketState state = new SocketState(client.SocketState.clientSocket);
client.SocketState.clientSocket = null;
client.SocketState = state;
client.SocketState.clientSocket.BeginReceive(client.SocketState.DataBuffer, 0, client.SocketState.DataBuffer.Length, SocketFlags.None, new AsyncCallback(readDataCallback), client);
}
catch (SocketException se)
{
System.Diagnostics.Debug.WriteLine("Wait For Data Exception 'n");
System.Diagnostics.Debug.WriteLine(se.Message);
}
}
public void readDataCallback(IAsyncResult ar)
{
Client client = (Client)ar.AsyncState;
try
{
// Read data from the client socket.
int iRx = client.SocketState.clientSocket.EndReceive(ar);
client.SocketState.SB.Append(Encoding.ASCII.GetString(client.SocketState.DataBuffer, 0, iRx));
string sPacketString = client.SocketState.SB.ToString();
Server formServer = this;
Packet_Helper packet_helper = new Packet_Helper(sPacketString, formServer);
Packet packet = new Packet(sPacketString);
client.SerialNumber = packet.SerialNumber;
client.FirmwareVersion = packet.FirmwareVersion;
client.ProductID = packet.ProductID;
client.HardwareVersion = packet.HardwareVersion;
if (!m_Clients.ContainsKey(packet.SerialNumber))
{
m_Clients.Add(packet.SerialNumber, client);
UpdateClientList();
string[] packets = client.refreshAll();
for (int i = 0; i < packets.Length; i++)
{
byte[] byteData = Encoding.ASCII.GetBytes(packets[i]);
client.SocketState.clientSocket.BeginSend(byteData, 0, byteData.Length, SocketFlags.None, new AsyncCallback(SendCallback), client);
AddPacketsSentText(packets[i] + "--" + (iSent++).ToString() + "'r'n'r'n");
}
}
System.Diagnostics.Debug.WriteLine("Read " + sPacketString.Length.ToString() + " bytes from " + client.SerialNumber + "'n" + sPacketString + "'n");
AddLogText("Read " + sPacketString.Length.ToString() + " bytes from " + client.SerialNumber + " 'r'n");
AddLogText(sPacketString.ToString() + "'r'n'r'n");
waitForData(client);
}
catch (ObjectDisposedException)
{
System.Diagnostics.Debugger.Log(0, "1", "'nOnDataReceived: Socket has been closed'n");
}
catch (SocketException se)
{
if (se.ErrorCode == 10054) // Error code for Connection reset by peer
{
string sclientSerial = "??????";
if (client.SerialNumber != null || client.SerialNumber != "")
sclientSerial = client.SerialNumber;
AddLogText("Client " + sclientSerial + " Disconnected" + "'r'n'r'n");
System.Diagnostics.Debug.WriteLine("Client " + sclientSerial + " Disconnected" + "'n");
m_Clients.Remove(sclientSerial);
UpdateClientList();
}
else
{
System.Diagnostics.Debug.WriteLine("Read Data Exception 'n");
System.Diagnostics.Debug.WriteLine(se.Message);
}
}
}
class SocketState
{
private Socket m_ClientSocket; //Socket connection to the client
private byte[] m_DataBuffer = new byte[256]; //Buffer to store the data sent by the client
private StringBuilder m_SB = new StringBuilder(); //for building recieved data into a string
/// <summary>
/// Gets or Sets the client Socket
/// </summary>
public Socket clientSocket
{
get { return m_ClientSocket; }
set { m_ClientSocket = value; }
}
/// <summary>
/// Gets the DataBuffer
/// </summary>
public byte[] DataBuffer
{
get { return m_DataBuffer; }
set { DataBuffer = value; }
}
/// <summary>
/// Gets or Sets the SB
/// </summary>
public StringBuilder SB
{
get { return m_SB; }
set { m_SB = value; }
}
public SocketState(Socket socket)
{
m_ClientSocket = socket;
m_ClientSocket.ReceiveBufferSize = 256;
m_ClientSocket.NoDelay = true;
//m_DataBuffer = Enumerable.Repeat((byte)0, 256).ToArray();
}
}
编辑：添加了AddLogText((函数。此函数用于向 UI 中的文本框添加文本。
//Delegate - 启用非同步调用以设置tb_ListeningLog的文本属性
delegate void AddLogTextCallback(string text);
private void AddLogText(string text)
{
// InvokeRequired required compares the thread ID of the
// calling thread to the thread ID of the creating thread.
// If these threads are different, it returns true.
if (this.tb_ListeningLog.InvokeRequired)
{
AddLogTextCallback d = new AddLogTextCallback(AddLogText);
this.Invoke(d, new object[] { text });
}
else
{
this.tb_ListeningLog.Text += text;
tb_ListeningLog.SelectionStart = tb_ListeningLog.Text.Length;
tb_ListeningLog.ScrollToCaret();
}
}
我对这个答案有点不了解，但您发布的代码肯定会有所帮助。
随着时间的推移，您可能会看到性能降低的原因是 readDataCallback 方法中的代码。按照您的设置方式，数据处理是在您进行另一次接收之前完成的。这意味着随着处理时间的增加，接收数据之间的持续时间也会增加。
我不知道你的很多方法中有什么代码，但你通常应该查看可能需要一段时间才能完成的任何循环。如果在查看代码时无法找到瓶颈，请尝试查找哪些方法需要最长的时间才能完成，并继续缩小代码范围。
例如(我猜瓶颈出在这个代码领域(：
if (!m_Clients.ContainsKey(packet.SerialNumber))
{
m_Clients.Add(packet.SerialNumber, client);
AddLogText("Running UpdateClientList'r'n");
UpdateClientList();
AddLogText("Doing client.refreshAll'r'n");
string[] packets = client.refreshAll();
AddLogText("Doing for loop'r'n");
for (int i = 0; i < packets.Length; i++)
{
byte[] byteData = Encoding.ASCII.GetBytes(packets[i]);
client.SocketState.clientSocket.BeginSend(byteData, 0, byteData.Length, SocketFlags.None, new AsyncCallback(SendCallback), client);
AddPacketsSentText(packets[i] + "--" + (iSent++).ToString() + "'r'n'r'n");
}
}
只需用眼睛观察每种方法之间的时间量，或者使其更容易并使用Stopwatch或DateTime来显示确切的时间。
此外，如果您发现代码的行为无法提高效率，则可以考虑在单独的线程中处理数据的想法。不过，我假设这种行为是不需要的，因为手头的问题。
对于AddLogText方法，请尝试使用 tb_ListeningLog.Text.AppendText 而不是 +=。
我不确定为什么你有这么长的一段代码来读取更多数据。 此外，尝试将消息放入可由其他线程处理的队列中。
这是我使用的一个实现：
// Read data from the client
private void ReadCallback(IAsyncResult ar)
{
StateObject state = (StateObject)ar.AsyncState;
Socket socket = state.workSocket;
try
{
if (socket.Connected)
{
// Read the socket
int bytesRead = socket.EndReceive(ar);
// Deserialize objects
foreach (MessageBase msg in MessageBase.Receive(socket, bytesRead, state))
{
// Add objects to the message queue
lock (this.messageQueue)
messageQueue.Enqueue(msg);
}
// Notify any event handlers
if (DataRecieved != null)
DataRecieved(socket, bytesRead);
// Asynchronously read more client data
socket.BeginReceive(state.Buffer, state.readOffset, state.BufferSize - state.readOffset, 0,
ReadCallback, state);
}
else
{
HandleClientDisconnect(socket);
}
}
catch (SocketException)
{
HandleClientDisconnect(socket);
}
}