serve.sd
A static file server
Python's http.server, compiled. Serves a directory with a thread per request.
kv_server.sd
A threaded key-value server
A thread per connection sharing one store, with match parsing commands. The compiler checks it's race-free.
kv_client.sd
A load-testing client
Checks every reply from the key-value server, then hammers it from a thread pool. Also plain Python.