What is the optimal number of threads for performing IO operations in java?

Question

In Goetz\'s \"Java Concurrency in Practice\", in a footnote on page 101, he writes \"For computational problems like this that do not I/O and access no shared data, Ncpu or

Answer 1

Like all performance related things it depends.

If you're I/O bound, then adding threads won't help you at all. (Ok, as Steven Sudit points out, you might get an increase in performance, but it'll be small) If you're not I/O bound then adding threads may help

Not trying to be smart, but the best way to find out is to profile it and see what works for your particular circumstances.

Edit: Updated based on comments