A simple UDP client/server system for server to pick top 90% of shortest messages from all messages from a client.

Server runs in multi-threaded mode, where the main thread spawns off all the worker thread, and wait them to terminate. In test mode, the threads will terminate. In UDP server mode, the server and its threads never terminate until forced by ctl-c.

The worker threads totaled 5, one of which is the reader of UDP socket. All others are message processer.

To compile:

make all

Then first run the server:

./server 9090

Afterward, run any number of clients:

./client localhost 9090 6

which will read from a file client-data/messages-6.txt, and send line by line to the server at localhost:9090.

For convenience of testing, a script is provided:

./multi-client-test.sh

will create multiple simultanerous clients to send UDP traffic to the server.

Each line is prefixed with the client ID, e.g. <6:> as above. Any empty line such as "6:" will indicate the end of the line stream.

The server is unlikely to terminate, unless user intervene. Client will terminate quickly at each run once finish sending the file.

The server can be unit tested if compiled with -DTEST=1. In that case, the server can ran using the internal test cases, and produce the same results in server-data/.

./stress-test.sh will create 4000 clients to send traffic at sporatic random intervals between [0, 1] millisecond. Performance could be limited also by file system IOs.