系统信息

1、查看cpu信息

说明：

us：用户态使用的cpu时间比
sy：系统态使用的cpu时间比
ni：用做nice加权的进程分配的用户态cpu时间比
id：空闲的cpu时间比
wa：cpu等待磁盘写入完成时间
hi：硬中断消耗时间
si：软中断消耗时间
st：虚拟机偷取时间
guest：访客状态下使用的cpu时间
guest_nice ： 访客状态下做nice加权的进程分配的用户态cpu时间

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详细说明参考：http://www.cnblogs.com/yjf512/p/3383915.html

2、查询内存信息

total, 内存总量

used, 已使用的内存数

free, 空闲内存数

buffers, 缓冲区使用数

swap, 交换分区使用数

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>>>
psutil.swap_memory()

sswap(total=2147479552L, used=0L, free=2147479552L, percent=0.0, sin=0, sout=0)

>>> psutil.virtual_memory()

svmem(total=1915383808L, available=1675317248L, percent=12.5, used=468250624L, free=1447133184L, active=155291648, inactive=167825408, buffers=1478656L, cached=226705408)

>>>

3、磁盘信息
磁盘利用率及IO信息 
read_count，读IO数 
write_count，写IO数 
read_bytes，读IO字节数 
write_count，写IO字节数 
read_time，磁盘读时间 
write_time，磁盘写时间

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>>> psutil.disk_partitions()

[sdiskpart(device='/dev/mapper/centos-root', mountpoint='/', fstype='xfs', opts='rw,seclabel,relatime,attr2,inode64,noquota'), sdiskpart(device='/dev/sda1', mountpoint='/boot', fstype='xfs', opts='rw,seclabel,relatime,attr2,inode64,noquota')]

>>> psutil.disk_usage('/')

sdiskusage(total=18746441728, used=6114557952, free=12631883776, percent=32.6)

>>> psutil.disk_usage('/boot')

sdiskusage(total=520794112, used=124702720, free=396091392, percent=23.9)

>>> psutil.disk_io_counters('perdisk=False？true')

{'sr0': sdiskio(read_count=11,
write_count=0, read_bytes=45056,
write_bytes=0, read_time=536,
write_time=0), 'dm-1': sdiskio(read_count=311, write_count=0, read_bytes=1273856, write_bytes=0, read_time=164, write_time=0), 'sda2': sdiskio(read_count=7551, write_count=1056, read_bytes=204730368, write_bytes=54938112, read_time=47515, write_time=177197),
'dm-0': sdiskio(read_count=7804, write_count=2387, read_bytes=203026432, write_bytes=54938112, read_time=52569, write_time=389048), 'sda1': sdiskio(read_count=2083, write_count=2117, read_bytes=9762816, write_bytes=20545024, read_time=1623, write_time=2216)}

4、网络信息
bytes_sent，发送字节数 
packets_sent，接收字节数 
packets_sent，发送数据包数 
packets_sent，接收数据包数
---------------------------------
>>> psutil.net_io_counters(pernic=False)
snetio(bytes_sent=153700, bytes_recv=175714, packets_sent=1214, packets_recv=1750, errin=0, errout=0, dropin=0, dropout=0)

5、用户登录退出信息
users 当前登录系统的用户信息
boot_time 获取开机时间，以linux时间戳返回
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>>> psutil.users()

[suser(name='root', terminal='tty1', host='', started=1437552640.0), suser(name='root', terminal='pts/0', host='192.168.91.1', started=1437549952.0)]
>>> psutil.boot_time()

1437549972.0

>>>import datetime

>>> datetime.datetime.fromtimestamp(psutil.boot_time ()).strftime("%Y-%m-%d %H: %M: %S")

'2015-07-23 08: 41: 10'