FastAPI python: How to run a thread in the background?

Option 1 You should start your Thread before calling uvicorn.run, as uvicorn.run is blocking the thread. import time import threading from fastapi import FastAPI import uvicorn app = FastAPI() class BackgroundTasks(threading.Thread): def run(self,*args,**kwargs): while True: print(‘Hello’) time.sleep(5) if __name__ == ‘__main__’: t = BackgroundTasks() t.start() uvicorn.run(app, host=”0.0.0.0″, port=8000) You could also start your thread using … Read more

Does an asynchronous call always create/call a new thread?

This is an interesting question. Asynchronous programming is a paradigm of programming that is principally single threaded, i.e. “following one thread of continuous execution”. You refer to javascript, so lets discuss that language, in the environment of a web browser. A web browser runs a single thread of javascript execution in each window, it handles … Read more

How does the JVM terminate daemon threads? or How to write daemon threads that terminate gracefully

I just wrote the following code as a test: public class DaemonThreadPlay { public static void main(String [] args) { Thread daemonThread = new Thread() { public void run() { while (true) { try { System.out.println(“Try block executed”); Thread.sleep(1000l); } catch (Throwable t) { t.printStackTrace(); } } } @Override public void finalize() { System.out.println(“Finalize method … Read more

WPF BackgroundWorker vs. Dispatcher

The main difference between the Dispatcher and other threading methods is that the Dispatcher is not actually multi-threaded. The Dispatcher governs the controls, which need a single thread to function properly; the BeginInvoke method of the Dispatcher queues events for later execution (depending on priority etc.), but still on the same thread. BackgroundWorker on the … Read more

Is it possible to force an existing Java application to use no more than x cores?

It’s called setting CPU affinity, and it’s an OS setting for processes, not specific to Java. On Linux: http://www.cyberciti.biz/tips/setting-processor-affinity-certain-task-or-process.html On Windows: http://www.addictivetips.com/windows-tips/how-to-set-processor-affinity-to-an-application-in-windows/ On Mac it doesn’t look like you can set it: https://superuser.com/questions/149312/how-to-set-processor-affinity-on-os-x