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javamultithreadingfork-join
Hitesh
Hitesh

Reputation: 462

Java Fork/Join Pool : Is it right to assume that number of threads in fork join pool depends entirely on underlying number of CPU's?

Can a developer tell fork/join pool to create certain number of threads? If yes then is it guaranteed that those many number of threads will be created by pool?

Upvotes: 0

Views: 2659

Answers (2)

vermaji
vermaji

Reputation: 539

basically a fork join pool is ThreadPool which works on work-stealing algorithm. There are api to specify parallelism (max number of active threads - (0-2^15-1))

Specifying parallelism doesn't mean pool will create those many threads at start, but it will create threads if required when work is submitted to pool.

Upvotes: 0

Vicky
Vicky

Reputation: 1225

Source : https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/ForkJoinPool.html

A ForkJoinPool is constructed with a given target parallelism level; by default, equal to the number of available processors. The pool attempts to maintain enough active (or available) threads by dynamically adding, suspending, or resuming internal worker threads, even if some tasks are stalled waiting to join others

Upvotes: 1

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