multithreading - How to configure a fine tuned thread pool for futures?

Question

How large is Scala's thread pool for futures?

My Scala application makes many millions of future {}s and I wonder if there is anything I can do to optimize them by configuring a thread pool.

Thank you.

Answer 1

This answer is from monkjack, a comment from the accepted answer. However, one can miss this great answer so I'm reposting it here.

implicit val ec = ExecutionContext.fromExecutor(Executors.newFixedThreadPool(10))

If you just need to change the thread pool count, just use the global executor and pass the following system properties.

-Dscala.concurrent.context.numThreads=8 -Dscala.concurrent.context.maxThreads=8