srakacomfort.blogg.se - Java timeslice windows

Now the question gets to be, does it make sense to have more than 4? This seems evident to us as if we have more CPU available and we use less thread, which means we are basically wasting our CPU. That means we have to have at least 4 threads. Let's assume we have a machine with 4 CPUs our goal is to maximize the usages of that 4 CPUs.

It also depends on how often the individual task will block. It depends on the nature of the workload we are putting in and the hardware the application is running. So the first question would be, what would be the maximum number? Well, the answer isn't straightforward. If we put too many, that may result in detrimental to the application's performance. However, the question still remains: what would be the minimum and the maximum number that we should use? Because this very critical to get the best performance. The ThreadPoolExecutor has multiple constructors and the Executors factory class uses the combination of these constructors and creates ThreadPool for us and makes our life a bit easy.

If we submit a task, these existing threads will pick it up. In the above ThreadPool, the minimum threads count is 5, which is when we would create the Pool, 5 threads will be created immediately, and they will be kept around, waiting for tasks, even if they are idle. Var threadPool = new ThreadPoolExecutor(5, 25, 100, TimeUnit.MILLISECONDS, new LinkedBlockingDeque(),ĮfaultThreadFactory(), new AbortPolicy()) įor (int i = 0 i ("Hello \uD83C\uDF0E"))

handler: the handler to use when execution is blocked because the thread bounds and queue capacities are reached for example, if capacities are reached, we want to reject the tasks.

It creates all threads in the same ThreadGroup.

threadFactory: the factory that creates a new thread when needed.

This is the queue where we put the tasks.

workQueue: Ideally the tasks are kept into a blocking queue.

timeUnit: time unit of keepAliveArgument, if could millisecond, second, etc.

This is the time thread will wait before getting terminated if they are idle.

keepAliveTime: if the number of the threads becomes larger than the corePoolSize, if some of them are idle, they get terminated.

maximumPoolSize: the maximum number of threads that the Pool allows.

corePoolSize: the number of threads that are always alive in the Pool, even when idle.

We can directly create a pool invoking its constructor. This class is the representation of ThreadPool that we use. Using the Executors factory class, we can create our thread pool however, all the factory methods internally create an instance of ThreadPoolExcutors. This article will go a bit in-depth about how many worker threads we could put in a pool to get the best result. Our previous article discussed different ways to create a Java thread pool and put and execute result-bearing tasks to the Pool.

Java Thread Programming (Part 13) February 08, 2022