joshtriplett / countserver

counter server example in threads and async/await

countserver: demo of Rust parallel/async

Bart Massey 2020

This is a little demo that provides client and server implementations of a counter: concurrent clients grab unique counter values from the server.

To build, specify either --features=tokio-rt or --features=async-std-rt to get an async client and server built with the specified async runtime.

Supplied programs:

• csthread: Concurrent count server using threads that access an Arc-protected atomic counter.

• csasync: Concurrent count server using async accesses to an Arc-protected atomic counter.

• ccasync: Concurrent count client that spawns many connections before collecting all counts.

Note that on my modern Linux box I need to run these things as root to get decent performance, and I need to

sysctl net.ipv4.tcp_syncookies=1

to get SYN cookies turned off on localhost. (Sigh. Working on reporting this.) Don't forget to turn it off when you're done!