How to monitor Linux UDP buffer available space?

Question

I have a java app on linux which opens UDP socket and waits for messages.

After couple of hours under heavy load, there is a packet loss, i.e. the packets are receiv

Answer 1

The process is simple:

1. If desired, pause the application process.

2. Open the UDP socket. You can snag it from the running process using /proc//fd if necessary. Or you can add this code to the application itself and send it a signal -- it will already have the socket open, of course.

3. Call recvmsg in a tight loop as quickly as possible.

4. Count how many packets/bytes you got.

This will discard any datagrams currently buffered, but if that breaks your application, your application was already broken.