By default, this thread pool has a maximum size of 40 threads in an application server environment and 10 threads in a client environment. By setting corePoolSize and maximumPoolSize the same, you create a fixed-size thread pool. The rules for the size of a ThreadPoolExecutor's pool are generally miss-understood, because it doesn't work the way that you think it ought to or in the way that you want it to.. Take this example. Starting thread pool size is 1, core pool size is 5, max pool size is 10 and the queue is 100. In IBM WebSphere Application Server Version 7.0, before Fix Pack 5, almost all of the work that is done by the WebSphere MQ messaging provider uses threads from the WMQCommonServices thread pool. This type of executor maintains a fixed-length queue and two pool sizes: a "core" size and a "maximum" size. management For cluster management. The maximum number of thread used by this pool is configure in jbm-configuration.xml with the thread-pool-max-size parameter.. 4. Bounded-Queue Thread Pool Executor. Thread pool type is fixed and a default maximum size of min(5, (# of allocated processors) / 2). Settings for the trivial experiment are: set “server thread pool size” to 1 and have a single client repeatedly makes the request described above for 30 seconds. (Click on the image to enlarge it) Thread pool type is scaling with a keep-alive of 5m and a default maximum size of 5. system_read For read operations on system indices. @bradimus I am using the threadPool only, I want to cap size the number of threads so CPU dont have to spend much time on context switching. This simple example may not demonstrate the full usefulness of using a custom Thread Pool, but the benefits become obvious in situations where we do not want to tie-up the common Thread Pool with long-running tasks (e.g. Thread pool type is fixed with a size of 1 and an unbounded queue size. processing data from a network source), or the common Thread Pool is being used by other components within the application. In previous tutorial, we learned about basic thread pool executor with unlimited possible number of threads into the pool and it’s example usage. This is the most complex executor type. In this post, I want to talk about how to set an optimal thread pool size. This general purpose thread pool is used for most asynchronous actions on the server side. When a task is accepted, if the number of running pool threads is less than the "core" size, a new thread is started to execute the task. – Madhav Patekar Jul 26 '17 at 17:35 @Andreas I am using that, just not sure how to put a cap on it to prevent CPU spending much time on context switching – Madhav Patekar Jul 26 '17 at 17:36 By setting maximumPoolSize to an essentially unbounded value such as Integer.MAX_VALUE, you allow the pool to accommodate an arbitrary number of concurrent tasks. Now lets look example of fixed size thread pool executor which will help in improved performance and better system resource utilization by limiting the maximum number of threads in thread pool.. 1) Create a task to execute The thread pool reuses previously created threads to execute current tasks and offers a solution to the problem of thread cycle overhead and resource thrashing. These help the WorkManager classify stuck threads. 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