思路:通过系统命令或操作系统文件获取到内存信息(linux 内存信息存在/proc/meminfo文件中,mac os 通过命令vm_stat命令可以查看)
并将获取到信息保存到数据库中,通过web将数据实时的展示出来.(获取数据—展示数据)
1、后台数据采集(获取数据)

import subprocess
import re
import MySQLdb as mysql
import time
import socket

#获取mysql数据游标,通过游标操作数据库
db = mysql.connect(user="root", passwd="123456",host="localhost", db="EBANK", charset="utf8")
db.autocommit(True)
cur = db.cursor()

"""
   Mac系统各应用程序占内存信息
"""
def processesUseMeminfo():
    ps = subprocess.Popen(['ps', '-caxm', '-orss,comm'], stdout=subprocess.PIPE).communicate()[0]
    processLines = ps.split('\n')
    print  processLines
    sep = re.compile('[\s]+')
    rssTotal = 0 # kB
    for row in range(1,len(processLines)):
       rowText = processLines[row].strip()
       rowElements = sep.split(rowText)
       try:
          rss = float(rowElements[0]) * 1024
       except:
          rss = 0 # ignore...
       rssTotal += rss
    return  rssTotal

"""
   Mac内存活动信息
"""
def processVM():
    vm = subprocess.Popen(['vm_stat'], stdout=subprocess.PIPE).communicate()[0]
    vmLines = vm.split('\n')
    sep = re.compile(':[\s]+')
    vmStats = {}
    for row in range(1,len(vmLines)-2):
        rowText = vmLines[row].strip()
        rowElements = sep.split(rowText)
        vmStats[(rowElements[0])] = int(rowElements[1].strip('\.'))/1024
    return vmStats

"""
   执行更新数据库中内存信息,供web展示内存的实时数据
"""
erval = 0
def execute():
    '''更新内存活动信息'''
    global erval
    try:
        ip = socket.gethostbyname(socket.gethostname()) #获取本机ip
        #ip = '10.21.8.10'
        vmStats = processVM()
        wired = vmStats['Pages wired down']
        active = vmStats['Pages active']
        free = vmStats['Pages free']
        inactive = vmStats['Pages inactive']
        t = int(time.time())
        sql = "insert into stat(host,mem_free,mem_usage,mem_total,load_avg,time) VALUES ('%s','%d','%d','%d','%d','%d')"\
              %(ip,wired,active,free,inactive,t)
        print sql
        cur.execute(sql)
        erval += 1
        if erval > 50:
            del_sql = "delete from stat where time < %d "%t
            print '执行数据清理.',del_sql
            cur.execute(del_sql)
            erval = 0

    except Exception , message :
        print '获取内存信息异常:',message
        #pass
    finally:
        pass


    '''更新'''
    #TODO
    #rssTotal = processesUseMeminfo()

#死循环不停的读取内存,每一秒钟插入一条新的内存信息
while True:
    time.sleep(1)
    execute()
    print 'none.'

获取到数据保存到MySQL数据中,新建表:

CREATE TABLE `stat` (
  `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `host` varchar(256) DEFAULT NULL,
  `mem_free` int(11) DEFAULT NULL,
  `mem_usage` int(11) DEFAULT NULL,
  `mem_total` int(11) DEFAULT NULL,
  `load_avg` varchar(128) DEFAULT NULL,
  `time` bigint(11) DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `host` (`host`(255))
) ENGINE=InnoDB AUTO_INCREMENT=0 DEFAULT CHARSET=utf8;

2、前台web采用flask应用框架,通过highstock实时展示折线图数据

from flask import Flask, request, render_template
import json
import MySQLdb as mysql

app = Flask(__name__)
db = mysql.connect(user="root", passwd="123456",host="localhost", db="EBANK", charset="utf8")
db.autocommit(True)
cur = db.cursor()

@app.route("/")
def index():
    return render_template("monitor.html")

tmp_time = 0

@app.route("/data")
def getdata():
    '''第一次查询全量数据,后面只查询增量数据'''
    global  tmp_time
    if tmp_time > 0 :
        sql = "select time,mem_free from stat where time >%s" %(tmp_time)
    else:
        sql = "select time,mem_free from stat"
    cur.execute(sql)
    datas = []
    for i in cur.fetchall():
        datas.append([i[0], i[1]])

    if len(datas) > 0 :
        tmp_time = datas[-1][0]

    return json.dumps(datas)


if __name__ == "__main__":
    app.run(host='0.0.0.0',port=8888,debug=True)

新建一个monitor.html

<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>内存监控</title>
    <script src="http://cdn.hcharts.cn/jquery/jquery-1.8.3.min.js"></script>
    <script src="http://cdn.hcharts.cn/highstock/highstock.js"></script>
    <script src="http://cdn.hcharts.cn/highcharts/modules/exporting.js"></script>
</head>
<body>

<div id="container" style="min-width:400px;height:400px"></div>

</body>

<script type="text/javascript">

$(function () {
    $.getJSON('/data', function (data) {
        // Create the chart
        $('#container').highcharts('StockChart', {
            chart: {
                events: {
                    load: function () {
                        var chart = $('#container').highcharts();
                        var series = chart.series[0];
                        //隔1秒,请求一次/data,实时获取内存信息
                        setInterval(function () {                  
                            $.getJSON("/data", function (res) {
                                $.each(res, function (i, v) {
                                    series.addPoint(v);
                                });
                            });
                        }, 1000);
                    }
                }
            },
            rangeSelector : {
                selected : 1
            },
            title : {
                text : 'AAPL Stock Price'
            },
            series : [{
                name : 'AAPL',
                data : data,
                tooltip: {
                    valueDecimals: 2
                }
            }]
        });
    });
});

</script>
</html>

done.
运行后台数据采集,运行前台web,通过http://localhost:8888/ 实时监控内存的活动情况。
效果图

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