各列参数意义:
USER :进程当前用户;
PID Process ID:进程ID;
PPID Process Parent ID:进程的父进程ID;
VSIZE Virtual Size:进程的虚拟内存大小;
RSS Resident Set Size:实际驻留"在内存中"的内存大小;
WCHAN :休眠进程在内核中的地址;
PC :Program Counter;
NAME: 进程名;