在缺少监控工具时的内存监控脚本

#!/bin/bash
while true
do
        prog_name="systemd"
        prog_mem=$(pidstat  -r -u -h -C $prog_name |awk 'NR==4{print $12}')
        time=$(date "+%Y-%m-%d %H:%M:%S")
        echo $time" memory(KByte)  "$prog_mem 
        sleep 1
done