Core pool size vs maximum pool size in ThreadPoolExecutor

java asynchronous threadpoolexecutor
user2568266 picture user2568266 · Jul 15, 2013 · Viewed 92k times · Source

What exactly is the difference between core pool size and maximum pool size when we talk in terms of ThreadPoolExecutor?
Can it be explained with the help of an example?

Answer

user2568266 picture user2568266 · Jul 16, 2013

From this blog post:

Take this example. Starting thread pool size is 1, core pool size is 5, max pool size is 10 and the queue is 100.

As requests come in, threads will be created up to 5 and then tasks will be added to the queue until it reaches 100. When the queue is full new threads will be created up to maxPoolSize. Once all the threads are in use and the queue is full tasks will be rejected. As the queue reduces, so does the number of active threads.

Related questions

new Thread(task).start() VS ThreadPoolExecutor.submit(task) in Android

In my Android project I had a lot of places where I need to run some code asynchronously (a web request, call to db etc.). This is not long running tasks (maximum a few seconds). Until now I was doing …

Read More
How to asynchronously call a method in Java

I've been looking at Go's goroutines lately and thought it would be nice to have something similar in Java. As far as I've searched the common way to parallelize a method call is to do something like: final String x = "…

Read More
Return a value from AsyncTask in Android

One simple question: is it possible to return a value in AsyncTask? //AsyncTask is a member class private class MyTask extends AsyncTask<Void, Void, Void>{ protected Void doInBackground(Void... params) { //do stuff return null; } @Override protected void onPostExecute(…

Read More