executorservice

Fibonacci on Java ExecutorService runs faster sequentially than in parallel

I am trying out the executor service in Java, and wrote the following code to run Fibonacci (yes, the massively recursive version, just to stress out the executor service). Surprisingly, it will run faster if I set the nThreads to 1. It might be related to the fact that the size of each "task"...

Android Images are not getting downloaded (very slow)

Actually here I am trying to download the multiple images from server, when I try to download images from localhost it wotks fine (within 3 sec images getting downloaded). But when I try to download it from actual server it is taking so long (atleast 15 sec) even though my internet connection is...

Java ExecutorService - sometimes slower than sequential processing?

I'm writing a simple utility which accepts a collection of Callable tasks, and runs them in parallel. The hope is that the total time taken is little over the time taken by the longest task. The utility also adds some error handling logic - if any task fails, and the failure is something that can be...

Handling exceptions from Java ExecutorService tasks

I'm trying to use Java's ThreadPoolExecutor class to run a large number of heavy weight tasks with a fixed number of threads. Each of the tasks has many places during which it may fail due to exceptions. I've subclassed ThreadPoolExecutor and I've overridden the afterExecute method which is supposed...

sequential event processing via executorservice

I have an event queue to process. A thread adds events to the queue. I have created a runnable Task that in the run method does all which is necessary to process the event. I have declared an Executors.newCachedThreadPool(); and I execute each Task. public class EventHandler { private static final...