选择() + UDP 导致打开文件过多
我目前有一个 select() 语句配置为跟踪两个 UDP socker。我在一个通用数据套接字上每秒可能发送 10 - 20 条消息，这正如我所期望的那样。
然而，当我收到大约 1024 条消息时，我收到通知：
talker：套接字：打开的文件太多 talker：绑定套接字失败
这对我来说是合乎逻辑的，因为 ulimit -n 显示该用户最多打开 1024 个文件。但是，为什么会有所有这些打开的文件呢？使用UDP，没有建立连接，所以我不认为我需要每次都关闭套接字（尽管也许我错了）。
有什么想法吗？提前致谢。
I currently have a select() statement configured to keep track of two UDP sockers. I send perhaps 10 - 20 messages a second at one general data socket, which is this interpreted as I expected.
However, once I hit around 1024 messages, I get the notice:
talker: socket: Too many open files
talker: failed to bind socket
This is logical to me, since ulimit -n shows a max of 1024 open files for this user. However, why are there all of these open files? With UDP, there is no connection made, so I do not believe I need to be closing a socket each time (although perhaps I'm wrong).
Any ideas? Thanks in advance.
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我认为在这种情况下“打开的文件太多”实际上意味着您已经达到了文件描述符限制；网络套接字计入此限制。您确定没有其他东西（例如在
routehelper中）创建更多套接字吗？你在什么平台上运行？如果 Linux，
lsof或在/proc//fd 中摸索 - 当它运行时，在达到限制之前 - 可能会说明所有 fd 的去向。提示：不要依赖
socket_udp_inboundALL在数值上大于socket_udp_inboundRC- 最好至少显式比较它们的值一次。I think in this case "Too many open files" really means you've hit the file descriptor limit; network sockets count towards this limit. Are you sure that there's nothing else - say in
routehelper- that's creating further sockets?What platform are you running on? If Linux,
lsofor grobbling around in/proc/<pid>/fd- while it's running, before it hits the limit - might illustrate where all the fds are going.Tip: Don't rely on
socket_udp_inboundALLbeing numerically larger thansocket_udp_inboundRC- it's better to explicitly compare their values at least once.如果您使用的是 Linux，请执行
strace(1)在客户端上检查socket(2)和open(2)与close(2)系统调用（尝试- e trace=socket,open,close选项）。这是此时平衡文件描述符计数的最简单方法。If you are on Linux do an
strace(1)on the client to check for thesocket(2)andopen(2)vsclose(2)system calls (try-e trace=socket,open,closeoption). This is the easiest way to balance the file descriptor count at this point.