GetMemInfo

getPIDMemInfo.sh

#!/bin/bash

get_main()
{
    #注意 awk print 有些系統是 $2 有些是 $1
    target=$(ps -ef | grep -v grep | grep $1 | awk '{print $2}')
    para1="grep -e State: -e Pid: -e Ppid: -e VmRSS: -e VmData: -e Threads:"
    para2="grep -v TracerPid:"

    for pid in $target
    do
        i=0
        if [ -d /proc/$pid ]; then
            #echo -n pid=$pid, `awk '{print $3 ", ppid="$4 ", tid_cnt="$20}' /proc/$pid/stat`
            val=$(cat /proc/$pid/status | $para1 | $para2 | awk '{print $2}')
        fi
        for ret in $val
        do
            if [ $i -eq 0 ]; then
                echo -n $ret
            elif [ $i -eq 1 ]; then
                echo -n " pid="$ret
            elif [ $i -eq 2 ]; then
                echo -n " ppid="$ret
            elif [ $i -eq 3 ]; then
                echo -n " VmRss="$(($ret/1024))"MB"
                vmrss=$ret
            elif [ $i -eq 4 ]; then
                echo -n " VmData="$(($ret/1024))"MB"
                vmdata=$ret
            elif [ $i -eq 5 ]; then
                echo -n " threads="$ret
            fi
            i=$((i+1))
        done
        echo -n -e '\t' "TotalMem="$(($(($vmrss+$vmdata))/1024))"MB"
        if [ -d /proc/$pid/fd ]; then
            echo " fd="$(ls -l /proc/$pid/fd | wc -l)
        else
            echo
        fi
    done
    echo ------
}

get_memory()
{
    ret=$(free -m | awk 'NR==3 {print "free="$4}')
    echo $ret"MB"
}


if [ $# -lt 1 ]; then
    echo "enter a execution name, ex: python3, java, chrome"
    exit
else
    echo "execution name:$1"
fi

while true;
do
    get_memory
    get_main $1
    sleep 3
done
  

./getPIDMemInfo.sh java


free 比較舊版本的格式

             total       used       free     shared    buffers     cached
Mem:           434        258        175          1          6         82
-/+ buffers/cache:        169        264
Swap:            0          0          0

ref:
1 .Linux Memory Usage 記憶體使用詳解
2. /proc/pid/stat說明
3. /proc/pid/status說明
4. 《嵌入式Linux内存使用与性能优化》笔记