Know how memory that is free compared to the maximum allowed

Question

Hi i want to know how memory is free compared to the maximum memory set in the jre advanced option or the defaut one
this function is suppose to work, bu im not able to have something good, for example if i set -Xmx256m, so 256mo max thatr the jre can use, and i know that my program use 30mo, i want to see that i have 30mo, but it always give me a weird number, like too low
     * This function will check the maximum memory allowed by the java runtime
     *  and check the number of memory avalaible now and calculate the memory
     *  that is free for using (if he havent enough memory, like only 30M free,
     *  the users will have a message into the java console). The function will
     *  try to release some memory with the garbage collector before displaying
     *  the warning user message
    public void checkMemory()
        /* Call the Garbage Collector and the finalization function 5 times to
            be sure that he has been notified */
        Runtime.getRuntime().runFinalization();
        Runtime.getRuntime().runFinalization();
        Runtime.getRuntime().runFinalization();
        Runtime.getRuntime().runFinalization();
        Runtime.getRuntime().runFinalization();
        System.gc();
        System.gc();
        System.gc();
        System.gc();
        System.gc();
        System.out.println("Total" + Runtime.getRuntime().totalMemory() / 102400);
        System.out.println("Free" + Runtime.getRuntime().freeMemory() / 102400);
        System.out.println("Max" + Runtime.getRuntime().maxMemory() / 102400);
        long freeBytes = Runtime.getRuntime().totalMemory()
            - Runtime.getRuntime().freeMemory();
        long freeMo = freeBytes / 102400;
        if (freeMo < 30)
            System.out.println("You have less than 30mo free for the java "
                + "runtime, you must close all your internet explorer and open "
                + "a new session, sorry for the incovenient and thank you");
        else
            System.out.println("ok");   
    //End of checkMemory function
[\code]
thx                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               

Answer 1

ok i know that isnt ok, if i change my division by /
(1024*1024) how can i know how to do the things i want
to do?
Huh? As I mentioned you are not using a meg. You are using some other number. So something is wrong with that.
And as I also mention you are using 'total' memory for your calculation instead of 'max' memory - and again I doubt that is what you want.
>
by the way mo is mb in french but i used this only for
myself... didnt think when i wrote the post
Interesting.