how many threads to run in java?

Question

I had this brilliant idea to speed up the time needed for generating 36 files: use 36 threads!! Unfortunately if I start one connection (one j2ssh connection object

Answer 1

You could narrow it down to a more reasonable number of threads with an ExecutorService. You probably want to use something near the number of processor cores available, e.g:

int threads = Runtime.getRuntime().availableProcessors();
ExecutorService service = Executors.newFixedThreadPool(threads);
for (int i = 0; i < 36; i++) {
    service.execute(new Runnable() {
        public void run() {
            // do what you need per file here
        }
    });
}
service.shutdown();