Seastar (C++ Async Framework)

It is a C++ framework for building server to handle huge load.
Invented in 2010. In 2015 ScyllaDB started using it

Architecture

Multicore
Asynchronous
Shared nothing
Thread-per-Core (Shared-Nothing) <<<<< This makes it Ultra Fast
  1 thread is allocated per CPU core. if system 10 physical CPU cores, seastar will start with 10 threads. Each thread binded(CPU affinity) to each core
  Each CPU core acts as an isolated, self-contained server with its own
  RAM
  network queue
  disk etc.
  This makes threads not to share memory with each other. Hence OS locking, context switching, IPC is completely skipped making it super fast.

Code

#include <seastar/core/app-template.hh>
#include <iostream>

int main(int argc, char** argv) {
    seastar::app_template app;

    return app.run(argc, argv, [] {
        std::cout << "Hello from Seastar!" << std::endl;
        return seastar::make_ready_future<>();
    });
}