C#Socket.send非常慢
问题描述:
我使用Socket
类将字节数组中的图像数据发送到在同一台PC上运行的第三方程序(所以我不必担心连接问题)。由于我的应用非常简单,因此我只使用同步send(bytes)
函数,仅此而已。问题是,它运行速度很慢。如果我发送一张20kB的小图片,它需要接近15ms,但是如果图片足够大--1.5mB,则需要接近800ms,这对我来说是不可接受的。我该如何提高插座性能?C#Socket.send非常慢
Socket sender = new Socket(AddressFamily.InterNetwork,SocketType.Stream, ProtocolType.Tcp);
IPHostEntry ipHostInfo = Dns.Resolve(Dns.GetHostName());
IPAddress ipAddress = ipHostInfo.AddressList[0];
IPEndPoint remoteEP = new IPEndPoint(ipAddress, 3998);
sender.Connect(remoteEP);
byte[] imgBytes;
MemoryStream ms = new MemoryStream();
Image img = Image.FromFile("С:\img.bmp");
img.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp);
imgBytes = ms.ToArray();
/*Some byte operations there: adding headers, file description and other stuff.
They are really fast and add just 10-30 bytes to array, so I don't post them*/
DateTime baseDate = DateTime.Now; // Countdown start
for (uint i = 0; i < 100; i++) sender.Send(byteMsg);
TimeSpan diff = DateTime.Now - baseDate;
Debug.Print("End: " + diff.TotalMilliseconds);
// 77561 for 1.42mB image, 20209 for 365kb, 1036 for 22kB.
答
问题是在另一边。我使用CCV socket modification作为服务器,看起来,该程序即使在接收图片时也会执行大量操作。我用测试服务器应用程序(来自Microsoft的Synchronous Server Socket Example,并从中删除了字符串分析)尝试了我的代码,因为这一切都开始工作快近100倍。
答
这可以读取一个大文件到存储器流,将其复制到一个数组,然后重新分配该阵列与一些数据,这实际上会影响性能预先考虑它,而不是Socket.send()。
尝试使用流流拷贝方法:
Socket sender = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
IPHostEntry ipHostInfo = Dns.Resolve(Dns.GetHostName());
IPAddress ipAddress = ipHostInfo.AddressList[0];
IPEndPoint remoteEP = new IPEndPoint(ipAddress, 3998);
sender.Connect(remoteEP);
using (var networkStream = new NetworkStream(sender))
{
// Some byte operations there: adding headers, file description and other stuff.
// These should sent here by virtue of writing bytes (array) to the networkStream
// Then send your file
using (var fileStream = File.Open(@"С:\img.bmp", FileMode.Open))
{
// .NET 4.0+
fileStream.CopyTo(networkStream);
// older .NET versions
/*
byte[] buffer = new byte[4096];
int read;
while ((read = fileStream.Read(buffer, 0, buffer.Length)) > 0)
networkStream.Write(buffer, 0, read);
*/
}
}
+0
谢谢你的回答,但它确实是'Socket.send()'杀死了性能。我已更新我的帖子,以使其明显。 – JustLogin
你可以显示你发送图像的方式吗? – mxmissile
更新了我的文章。 – JustLogin
你是基准吗?那就是,只有'sender.Send'? – Martijn