How much memory is my program using Java

Question

I am made a program which uses A* search algorithm to solve 8 game puzzle. I was interested in seeing how much memory is being used by my program from start to finish.

So far i have done

In the beginning of the program

static double totalMem = Runtime.getRuntime().totalMemory()/(1024*1024);
static double memoryMax = Runtime.getRuntime().maxMemory()/(1024*1024);

and at the end of the program

        timeTaken-=System.currentTimeMillis();

        System.out.println("\n\n-------Total Time Taken = "+Math.abs(timeTaken)+
                " millisec ------\n ");

        System.out.println("-------Maximum Memory  = "+memoryMax+" MB------\n ");

        System.out.println("-------Total Memory = "+totalMem
                +" MB------\n ");

        currMem = Runtime.getRuntime().freeMemory()/(1024*1024);

        System.out.println("-------Free Memory  = "+currMem+" MB------\n ");

        double memUsed = (Runtime.getRuntime().totalMemory())/(1024*1024)-currMem;

        System.out.println("-------Total Used = "+memUsed
                +" MB------\n ");

This doesn't seems to be right. When i test with different sets of data. Any sugessitions

Answer 1

It would be better to use profiler or similar software for this purpose. You can start with jvisualvm which is included in JDK or JProfiler.