系统版本：
[root@docker ~]# cat /etc/redhat-release CentOS Linux release 7.2.1511 (Core) [root@docker ~]#
查看内存信息：其实只需要关注前5行即可；
[root@docker ~]# cat /proc/meminfo MemTotal: 2049248 kB MemFree: 85408 kB MemAvailable: 1061812 kB Buffers: 138044 kB Cached: 885028 kB SwapCached: 33308 kB Active: 881088 kB Inactive: 832516 kB Active(anon): 315948 kB Inactive(anon): 375464 kB Active(file): 565140 kB Inactive(file): 457052 kB Unevictable: 0 kB Mlocked: 0 kB SwapTotal: 524284 kB SwapFree: 377836 kB Dirty: 24 kB Writeback: 0 kB AnonPages: 659500 kB Mapped: 71544 kB Shmem: 876 kB Slab: 160772 kB SReclaimable: 123148 kB SUnreclaim: 37624 kB KernelStack: 7408 kB PageTables: 20580 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 1548908 kB Committed_AS: 2998548 kB VmallocTotal: 34359738367 kB VmallocUsed: 156648 kB VmallocChunk: 34359541760 kB HardwareCorrupted: 0 kB AnonHugePages: 434176 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 2048 kB DirectMap4k: 73664 kB DirectMap2M: 2023424 kB DirectMap1G: 0 kB [root@docker ~]# [root@docker ~]# free -m total used free shared buff/cache available Mem: 2001 762 81 0 1156 1035 Swap: 511 142 369 [root@docker ~]#
内存使用率的计算：mem_used=MemTotal-MemFree-Buffers
python 代码：
#/usr/bin/env python
import time
import pymysql as mysql
db = mysql.connect(user='dba',passwd='123456',db='memory',host='localhost')
db.autocommit(True)
cur = db.cursor()
def getMem():
f = open('/proc/meminfo')
total = int(f.readline().split()[1])
free = int(f.readline().split()[1])
MemAvailable = f.readline().split()
cache = int(f.readline().split()[1])
mem_use = total-free-cache
t = time.time()
sql = 'insert into memory(memory,time) values(%s,%s)' %(mem_use/1024,t)
cur.execute(sql)
#print mem_use
print ('ok')
while True:
time.sleep(1)
getMem()安装pymysql模块
pip install pymysql
创建数据库以及表：
MariaDB [(none)]> create database memory charset=utf8; MariaDB [(none)]> use memory; MariaDB [(none)]> CREATE TABLE `memory` ( `memory` int(11) DEFAULT NULL, `time` int(11) DEFAULT NULL ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4; 授权用户 MariaDB [(none)]> grant all on *.* to dba@'localhost' identified by '123456'; MariaDB [(none)]> flush privileges;
执行python代码，每隔一秒就会打印一个ok到终端，然后在Mysql里查询一下；
MariaDB [memory]> select * from memory limit 5; +--------+------------+ | memory | time | +--------+------------+ | 1775 | 1513906229 | | 1775 | 1513906230 | | 1775 | 1513906231 | | 1775 | 1513906232 | | 1775 | 1513906233 | +--------+------------+ 5 rows in set (0.00 sec)
注：Mysql的表只用了两个字段，一个内存使用率，这个值是以兆为单位的，另一个就是时间了。
MariaDB [(none)]> use memory; Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A Database changed MariaDB [memory]> show create table memory\G *************************** 1. row *************************** Table: memory Create Table: CREATE TABLE `memory` ( `memory` int(11) DEFAULT NULL, `time` int(11) DEFAULT NULL ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 1 row in set (0.00 sec) MariaDB [memory]>
Python 获取CentOS7的内存使用率并写入mysql
原文地址：http://blog.51cto.com/dengaosky/2053186
