> Want to build a web app, every more or less popular framework is async.
I think its the same as Java, Tomcat has some async threadpool inside, they just hide it from you, and your favorite rust framework doesn't, you need manually move your sync logic to Tokio spawn_blocking
Java is different. Tomcat's thread pool is the older way. A lot of newer stuff was using something promises-related instead with an event loop. But then recently Java added virtual threads which should obviate the need for that, similar to Go. Rust considered virtual threads but chose against that because it requires a more abstracted runtime like Java and Go have. Great preso on this https://www.youtube.com/watch?v=lJ3NC-R3gSI
All the "async" stuff is super poorly named. They mean cooperative multitasking, or I guess "async within a single kernel thread." Yeah multiple kernel threads are asynchronous but "async" doesn't mean that :S
