使用Java中的ProcessBuilder调用的外部进程使用的内存和占用的时间

Question

I searched stackoverflow for this question but i did not got any useful answer. I want to get the memory used and time taken by the external process which in being invoked by the ProcessBuilder in Java. If the process exceeds a time limit/memory limit then i need to kill it.

To calculate the time taken by the process I am using the following code:

   process = new ProcessBuilder(command).start();
starttTime = System.currentTimeMillis();
     flag=false;
        while (flag != true) {
                    try { 
                        returnValue = process.exitValue();
                        flag = true;
                        if (returnValue != 0) {
                            System.out.println("Abnormal termination");
                        } else {
                           System.out.println("Normal termination");
                        }
                        System.out.println("Done");

                    } catch (IllegalThreadStateException e) {
                    }

                    currentTime = System.currentTimeMillis();
                    if (currentTime - startTime > timeLimitInMilli) {
                        System.out.println("process exceeding time limit");
                        break;
                    }

              }

But this method of calculating the time is slow. Is there any faster method of doing the same. Also, I am unable to get the memory used by the process. How can I get it ?

Also, this code is being used by multiple threads that means more than one process is being invoked at a time by different threads.

Answer 1

One solution would be to run a wrapper script instead of running the command directly. The purpose of the script would be to check the execution time and memory usage (using OS utilities) and return an error code to indicate any problems.

Alternatively, you could use JNI or other OS-specific commands to determine the memory usage of the other process.

If the other process is a JVM or some other program that will report back its memory usage (for example, via an MXBean) then your loop could ask it directly to report memory usage.