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Showing posts from October, 2017

Java ExecutorService and Linux Max Process Limit

Here's a little post about the Java ExecutorService, and a problem I ran into on Ubuntu. Consider this Java code
public static void main(String[] args) throws InterruptedException { int tasksSubmitted = 0; int nTasks = 800; int taskDur = 2000; int nThreads = 400; ExecutorService executor = Executors.newFixedThreadPool(nThreads); try { for (int i = 0; i < nTasks; i++) { executor.submit(() -> { try { Thread.sleep(taskDur); } catch (InterruptedException e) { System.out.println(e); } }); tasksSubmitted++; } } catch (Error | Exception e) { System.out.println(e); } System.out.println("Tasks submitted: " + tasksSubmitted); executor.shutdown(); executor.awaitTermination(Long.MAX_VALUE, TimeUnit.MILLISECONDS); if (tasksSubmitted != nTasks) { System.out.println("Only…