Jan Hudec a écrit : > On Tue, Aug 23, 2005 at 20:00:03 +0000, Vincenzo Mallozzi wrote: > >>While, the result of "ps -l -C javaprog" is like this: >> >>pid ppid ......... >>510 507 ........ >>511 510 ........ >>512 511 ...... >> >>Why this happens on Java programs? What is the real program? >>I want to underline that, in these examples, I'm not using threads. > > > It looks like threads anyway. This is not a matter of Linux, but rather > a matter of gcj. It may be using threads for garbage collection or something > even if the program itself does not use them. > I confirm: the JVM usually used a separate thread as a garbage collector. For the third thread, it is probably the thread for managing the events (if you use a GUI for example). It might be something else, but it depends of your program. Also note that it can depends of your JVM implementation. For example, SableVM seems smart enought for not using a thread for garbage collection if there is no needs for it, so your program give me only one thread. But on normal non-multithreaded programs it give me 3 threads likes you. I get similar results on Solaris with SUN Java implementation. So I guess your JVM always start a thread for the garbage collector and another one for managing the events regardless if your program needs it or not. Simon Valiquette http://gulus.USherbrooke.ca http://www.gulus.org -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
