Programming Concurrency on the JVM

Recap

Here are the ways to reap the benefits of multicore processors:

• We have to divide the application into multiple tasks that can be run concurrently.

• We should choose at least as many threads as the number of cores, provided the problem is large enough to benefit from those many threads.

• For computationally intensive applications, we should limit the number of threads to the number of cores.

• For IO-intense applications, the time spent blocking influences the number of threads we’d create.

• Estimate the number of threads using the following formula:

  where 0 ≤ blocking coefficient < 1.

• We should slice the problem into several parts so there is enough work for cores and ...