Java jmap与jcmd命令dump内存heap堆

Posted 2021-12-04 zhangphil

        //获取当前Java程序的进程id
        long pid = ProcessHandle.current().pid();

        //jmap与jcmd两种命令方式效果相同，均为dump内存
        String[] cmd1 = {"jmap", "-dump:live,formt=b,file=D:/dump/jmap.hprof", String.valueOf(pid)};
        String[] cmd2 = {"jcmd", String.valueOf(pid), "GC.heap_dump", "D:/dump/jcmd.hprof"};

        try {
            Runtime.getRuntime().exec(cmd1);
            Runtime.getRuntime().exec(cmd2);
        } catch (IOException e) {
            e.printStackTrace();
        }

        try {
            //等待输入任意按钮结束程序。如果没有这一段代码，程序很快返回后，dump内存来不及处理，没有日志输出。
            System.in.read();
        } catch (IOException e) {
            e.printStackTrace();
        }