Java生成堆内存dump的问题

jmap -dump:format=b,file=/path/heap.bin 进程ID  
jmap -dump:live,format=b,file=/path/heap.bin 进程ID  

package com.szh;
 
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Scanner;
import java.util.concurrent.TimeUnit;
 
public class TestDump {
    public static void main(String[] args) throws InterruptedException, IOException {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy_MM_dd_HH_mm_ss");
        Runtime runtime = Runtime.getRuntime();
 
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入java进程PID：");
        int pID = scanner.nextInt();
        System.out.println("请输入dump文件输出路径：");
        String dumpPath = scanner.next();
        scanner.close();
 
        if (!dumpPath.endsWith(File.separator)) {
            dumpPath = dumpPath + File.separator;
        }
        String cmd = "jmap -dump,format=b,file=" + dumpPath + "_" + sdf.format(new Date()) + ".bin " + pID;
        runtime.exec(cmd);
        TimeUnit.SECONDS.sleep(5L);
 
        while (true) {
            cmd = "jmap -dump:live,format=b,file=" + dumpPath + "_" + sdf.format(new Date()) + ".bin " + pID;
            Process process = runtime.exec(cmd);
            /*InputStreamReader isr = new InputStreamReader(process.getInputStream(), "GBK");
            BufferedReader br = new BufferedReader(isr);
            while (true) {
                String str = br.readLine();
                if (str == null) {
                    break;
                }
                System.out.println(str);
            }*/
            TimeUnit.HOURS.sleep(1L);
        }
    }
}

-XX:+HeapDumpOnOutOfMemoryError

-XX:+HeapDumpOnOutOfMemoryError
-XX:HeapDumpPath=/home/app/dumps/

jmap -dump:format=b,file=/home/app/testdump.hprof 6218