如何使用SIGAR库获取Java进程的内存使用情况？

Question

The process below is executing a c++ code.I want to know the memory used by the c++ code.

ProcessBuilder p = new ProcessBuilder("./" + compiledFile);
Process pp = p.start();
long id = getProcessID(pp);
Sigar sigar=new Sigar();
ProcMem memory=new ProcMem();
memory.gather(sigar, id);
System.out.println("memory ---> "+Long.toString(memory.getSize()));

I have tried the follwing code.But it returns sigar exception: "No such process". To get the process id I am using following method

public long getProcessID(Process p)
    {
        long pid = -1;
        try
        {
            if (p.getClass().getName().equals("java.lang.UNIXProcess")) 
            {
                Field f = p.getClass().getDeclaredField("pid");
                f.setAccessible(true);
                result = f.getLong(p);
                f.setAccessible(false);
            }
        }
        catch(Exception ex)
        {
            pid = -1;
        }
        return pid;
    }

I am a novice.Did I get something wrong? Or Am i doing something wrong? any help or suggestion will be much appreciated..thanks.

Answer 1

Have you looked at this class . It is not elegant at all, but seems to be an example of what you would want to do.