How to configure a fine tuned thread pool for futures?

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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

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