wget https://pypi.python.org/packages/source/p/psutil/psutil-2.2.0.tar.gz --no-check-certificate 
tar xf psutil-2.2.0.tar.gz 
cd psutil-2.2.0
python setup.py install

pip install psutil

获取CPU的物理个数
>>> psutil.cpu_count(logical=False)
 
获取CPU的逻辑个数，默认logical=True
>>> psutil.cpu_count()
 
获取cpu负载的百分比
>>> psutil.cpu_percent()
0.10000000000000001
 
获取cpu的完整信息，需要显示所有逻辑cpu信息
>>> psutil.cpu_times()
scputimes(user=3.2999999999999998, nice=0.0, system=16.329999999999998, idle=8322.0400000000009, iowait=21.93, irq=0.46999999999999997, softirq=0.54000000000000004, steal=0.0, guest=0.0)
 
获取单项数据信息，如用户user的CPU时间比 
>>> psutil.cpu_times().user
3.2999999999999998
 
时间间隔，是否以列表形式输出
>>> psutil.cpu_times_percent(interval=2,percpu=True)
[scputimes(user=0.0, nice=0.0, system=0.0, idle=100.0, iowait=0.0, irq=0.0, softirq=0.0, steal=0.0, guest=0.0)]

>>>mem = psutil.virtual_memory() 
获取获取内存完整信息
>>> mem    
svmem(total=1960640512L, available=1861410816L, percent=5.0999999999999996, used=158261248L, free=1802379264L, active=55451648, inactive=35868672, buffers=13492224L, cached=45539328)
 
获取内存总数
>>> mem.total
1960640512L
 
获取使用内存
>>> mem.used
158261248L
 
获取空闲内存
>>> mem.free
1802379264L
 
获取swap分区信息
>>> psutil.swap_memory()
sswap(total=4160741376L, used=0L, free=4160741376L, percent=0.0, sin=0, sout=0)

获取磁盘的完整信息
>>> psutil.disk_partitions()
[sdiskpart(device='/dev/mapper/VolGroup-lv_root', mountpoint='/', fstype='ext4', opts='rw'), sdiskpart(device='/dev/sda1', mountpoint='/boot', fstype='ext4', opts='rw')]
 
获取分区的使用情况
>>> psutil.disk_usage('/')
sdiskusage(total=16521789440, used=1433333760, free=14249177088, percent=8.6999999999999993)
>>> psutil.disk_usage('/boot')
sdiskusage(total=507744256, used=33196032, free=448333824, percent=6.5)
 
获取硬盘总的IO数
>>> psutil.disk_io_counters()
sdiskio(read_count=7295, write_count=7190, read_bytes=116201472, write_bytes=38065152, read_time=123500, write_time=33952)
 
获取单个分区IO个数 读写信息
>>> psutil.disk_io_counters(perdisk=True)
{'dm-1': sdiskio(read_count=297, write_count=0, read_bytes=1216512, write_bytes=0, read_time=534, write_time=0), 'sda2': sdiskio(read_count=2462, write_count=2543, read_bytes=56902656, write_bytes=19034112, read_time=29130, write_time=11733), 'dm-0': sdiskio(read_count=3859, write_count=4647, read_bytes=55251968, write_bytes=19034112, read_time=93096, write_time=22216), 'sda1': sdiskio(read_count=677, write_count=6, read_bytes=2830336, write_bytes=21504, read_time=740, write_time=5)}

获取网络总的IO信息，默认pernic=False
>>> psutil.net_io_counters()
snetio(bytes_sent=910776, bytes_recv=13499265, packets_sent=8757, packets_recv=15556, errin=0, errout=0, dropin=0, dropout=0)
 
 
获取每个网络接口的IO信息
>>> psutil.net_io_counters(pernic=True)
{'lo': snetio(bytes_sent=0, bytes_recv=0, packets_sent=0, packets_recv=0, errin=0, errout=0, dropin=0, dropout=0), 'eth2': snetio(bytes_sent=911296, bytes_recv=13405208, packets_sent=8761, packets_recv=14795, errin=0, errout=0, dropin=0, dropout=0), 'eth1': snetio(bytes_sent=1788, bytes_recv=98301, packets_sent=18, packets_recv=803, errin=0, errout=0, dropin=0, dropout=0)}
 
获取所有接口的网卡信息
>>> psutil.net_connections()
[sconn(fd=3, family=2, type=1, laddr=('0.0.0.0', 22), raddr=(), status='LISTEN', pid=1110), sconn(fd=12, family=2, type=1, laddr=('127.0.0.1', 25), raddr=(), status='LISTEN', pid=1186), sconn(fd=3, family=2, type=1, laddr=('192.168.10.26', 22), raddr=('192.168.10.1', 54342), status='ESTABLISHED', pid=1794), sconn(fd=4, family=10, type=1, laddr=('::', 22), raddr=(), status='LISTEN', pid=1110), sconn(fd=13, family=10, type=1, laddr=('::1', 25), raddr=(), status='LISTEN', pid=1186), sconn(fd=6, family=2, type=2, laddr=('0.0.0.0', 68), raddr=(), status='NONE', pid=1745), sconn(fd=6, family=2, type=2, laddr=('0.0.0.0', 68), raddr=(), status='NONE', pid=1643)]
 
获取指定接口的网卡信息
>>> psutil.net_connections(kind='inet4')
[sconn(fd=3, family=2, type=1, laddr=('0.0.0.0', 22), raddr=(), status='LISTEN', pid=1110), sconn(fd=12, family=2, type=1, laddr=('127.0.0.1', 25), raddr=(), status='LISTEN', pid=1186), sconn(fd=3, family=2, type=1, laddr=('192.168.10.26', 22), raddr=('192.168.10.1', 54342), status='ESTABLISHED', pid=1794), sconn(fd=6, family=2, type=2, laddr=('0.0.0.0', 68), raddr=(), status='NONE', pid=1745), sconn(fd=6, family=2, type=2, laddr=('0.0.0.0', 68), raddr=(), status='NONE', pid=1643)]

获取当前登录系统的用户信息
>>> psutil.users()
[suser(name='root', terminal='tty1', host='', started=1427459328.0), suser(name='root', terminal='pts/0', host='192.168.10.1', started=1427459456.0), suser(name='root', terminal='pts/1', host='192.168.10.1', started=1427459456.0), suser(name='root', terminal='pts/2', host='192.168.10.1', started=1427459584.0)]
>>> len(psutil.users())
4
 
获取系统开机时间并格式化输出
>>> datetime.datetime.fromtimestamp(psutil.boot_time()).strftime('%Y-%m-%d %H:%M:%S')
'2015-03-27 20:27:36'

>>> import psutil
>>> psutil.pids()    列出所有进程的PID
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 37, 38, 40, 41, 71, 199, 203, 218, 219, 220, 325, 327, 344, 345, 364, 417, 569, 764, 765, 817, 1042, 1058, 1070, 1110, 1186, 1194, 1197, 1209, 1211, 1213, 1215, 1217, 1219, 1228, 1229, 1231, 1298, 1643, 1745, 1794, 1796, 1829, 1846, 2004, 2039, 2154, 2175]
>>> p = psutil.Process(2154)    实例化一个Process对象，参数为一个进程的PID
>>> p.name()    进程名
'python'
>>> p.exe()    进程bin路径
'/usr/bin/python'
>>> p.cwd()    进程工作目录绝对路径
'/root'
>>> p.status()    进程状态
'running'
>>> p.create_time()    进程创建时间、时间戳格式
1427469528.49
>>> p.uids()    进程uid信息
puids(real=0, effective=0, saved=0)
>>> p.gids()    进程gid信息
pgids(real=0, effective=0, saved=0)
>>> p.cpu_times()    进程CPU时间信息
pcputimes(user=0.059999999999999998, system=0.050000000000000003)
>>> p.cpu_affinity()    get进程CPU亲和度
[0]
>>> p.memory_percent()    进程内存利用率
0.43265534645853532
>>> p.memory_info()    进程内存rss、vms信息
pmem(rss=8486912, vms=185946112)
>>> p.io_counters()    进程IO信息，包括读写IO数及字节数
pio(read_count=2206, write_count=1286, read_bytes=40960, write_bytes=0)
>>> p.connections()    返回打开进程socket的namedutples列表
[]
>>> p.num_threads()    进程开启的线程数
1