CODEWITHSUNDEEP
java-8
Mohit Sharma
Mohit Sharma

Reputation: 112

What is the maximum number of processes that can be used in parallel Stream

I know that we can use -Djava.util.concurrent.ForkJoinPool.common.parallelism to set the parallelism, but is there any upper limit to it?

Upvotes: 1

Views: 319

Answers (1)

Holger
Holger

Reputation: 298123

By looking into the source code of ForkJoinPool, I find the definition of

MAX_CAP    = 0x7fff;  // max #workers - 1

which is enforced when using the constructor ForkJoinPool(int) by throwing an exception when you attempt to specify more. However, when using the system property, java.util.concurrent.ForkJoinPool.common.parallelism to configure the parallelism of the common pool, you can safely specify more (up to Integer.MAX_VALUE), it will be silently reduced to the supported maximum then.

Upvotes: 2

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