python获取系统信息psutil：psutil获取系统cpu使用率的方法是cpu_percent(),其有两个参数，分别是interval和percpu,interval指定的是计算cpu使用率的时间间隔，percpu则指定是选择总的使用率还是每个cpu的使用率。

import psutil

    #cpu使用率

    cpu=(str)(psutil.cpu_percent(1))+'%'

    #剩余内存.free  总共.total

    memory=str(psutil.virtual_memory().free/(1024.0*1024.0))+'M'

    #剩余磁盘 "/"是当前磁盘，可换成其他路径

    #>>>psutil.disk_usage() 有四个值

    #>>>sdiskusage(total=278206668800L, used=140436959232L, free=137769709568L, percent=50.5)

    disk=str(psutil.disk_usage("/")[2]/(1024.0 * 1024 * 1024))

>>> message = '''interpreter

... prompt'''

psutil

psutil是python的一个用于获取cpu信息的模块，非常好使，以下附上官方的一些example：

- - - - - - - - - - CPU-> Examples

>>> import psutil

>>> psutil.cpu_times()

scputimes(user=3961.46, nice=169.729, system=2150.659, idle=16900.540, iowait=629.59, irq=0.0, softirq=19.42, steal=0.0, guest=0, nice=0.0)

>>>

>>> for x in range(3):

...     psutil.cpu_percent(interval=1)

...

4.0

5.9

3.8

>>>

>>> for x in range(3):

...     psutil.cpu_percent(interval=1, percpu=True)

...

[4.0, 6.9, 3.7, 9.2]

[7.0, 8.5, 2.4, 2.1]

[1.2, 9.0, 9.9, 7.2]

>>>

>>>

>>> for x in range(3):

...     psutil.cpu_times_percent(interval=1, percpu=False)

...

scputimes(user=1.5, nice=0.0, system=0.5, idle=96.5, iowait=1.5, irq=0.0, softirq=0.0, steal=0.0, guest=0.0, guest_nice=0.0)

scputimes(user=1.0, nice=0.0, system=0.0, idle=99.0, iowait=0.0, irq=0.0, softirq=0.0, steal=0.0, guest=0.0, guest_nice=0.0)

scputimes(user=2.0, nice=0.0, system=0.0, idle=98.0, iowait=0.0, irq=0.0, softirq=0.0, steal=0.0, guest=0.0, guest_nice=0.0)

>>>

>>> psutil.cpu_count()

4

>>> psutil.cpu_count(logical=False)

2

>>>

---------------------------Memory-> Examples:

>>> psutil.virtual_memory()

svmem(total=8374149120L, available=2081050624L, percent=75.1, used=8074080256L, free=300068864L, active=3294920704, inactive=1361616896, buffers=529895424L, cached=1251086336)

>>> psutil.swap_memory()

sswap(total=2097147904L, used=296128512L, free=1801019392L, percent=14.1, sin=304193536, sout=677842944)

>>>

>

----------------------Disks-> Examples:

>>> psutil.disk_partitions()

[sdiskpart(device='/dev/sda1', mountpoint='/', fstype='ext4', opts='rw,nosuid'),

 sdiskpart(device='/dev/sda2', mountpoint='/home', fstype='ext', opts='rw')]

>>>

>>> psutil.disk_usage('/')

sdiskusage(total=21378641920, used=4809781248, free=15482871808, percent=22.5)

>>>

>>> psutil.disk_io_counters(perdisk=False)

sdiskio(read_count=719566, write_count=1082197, read_bytes=18626220032, write_bytes=24081764352, read_time=5023392, write_time=63199568)

>>>

>

--------------------------Networks-> Examples:

>>> psutil.net_io_counters(pernic=True)

{'eth0': netio(bytes_sent=485291293, bytes_recv=6004858642, packets_sent=3251564, packets_recv=4787798, errin=0, errout=0, dropin=0, dropout=0),

 'lo': netio(bytes_sent=2838627, bytes_recv=2838627, packets_sent=30567, packets_recv=30567, errin=0, errout=0, dropin=0, dropout=0)}

>>>

>>> psutil.net_connections()

[pconn(fd=115, family=2, type=1, laddr=('10.0.0.1', 48776), raddr=('93.186.135.91', 80), status='ESTABLISHED', pid=1254),

 pconn(fd=117, family=2, type=1, laddr=('10.0.0.1', 43761), raddr=('72.14.234.100', 80), status='CLOSING', pid=2987),

 pconn(fd=-1, family=2, type=1, laddr=('10.0.0.1', 60759), raddr=('72.14.234.104', 80), status='ESTABLISHED', pid=None),

 pconn(fd=-1, family=2, type=1, laddr=('10.0.0.1', 51314), raddr=('72.14.234.83', 443), status='SYN_SENT', pid=None)

 ...]

------------------Other system info-> Examples:

>>> psutil.users()

[user(name='giampaolo', terminal='pts/2', host='localhost', started=1340737536.0),

 user(name='giampaolo', terminal='pts/3', host='localhost', started=1340737792.0)]

>>>

>>> psutil.boot_time()

1365519115.0

>>>

Process Management-> Examples:

>>> import psutil

>>> psutil.pids()

[1, 2, 3, 4, 5, 6, 7, 46, 48, 50, 51, 178, 182, 222, 223, 224,

 268, 1215, 1216, 1220, 1221, 1243, 1244, 1301, 1601, 2237, 2355,

 2637, 2774, 3932, 4176, 4177, 4185, 4187, 4189, 4225, 4243, 4245,

 4263, 4282, 4306, 4311, 4312, 4313, 4314, 4337, 4339, 4357, 4358,

 4363, 4383, 4395, 4408, 4433, 4443, 4445, 4446, 5167, 5234, 5235,

 5252, 5318, 5424, 5644, 6987, 7054, 7055, 7071]

>>>

>>> p = psutil.Process(7055)

>>> p.name()

'python'

>>> p.exe()

'/usr/bin/python'

>>> p.cwd()

'/home/giampaolo'

>>> p.cmdline()

['/usr/bin/python', 'main.py']

>>>

>>> p.status()

'running'

>>> p.username()

'giampaolo'

>>> p.create_time()

1267551141.5019531

>>> p.terminal()

'/dev/pts/0'

>>>

>>> p.uids()

puids(real=1000, effective=1000, saved=1000)

>>> p.gids()

pgids(real=1000, effective=1000, saved=1000)

>>>

>>> p.cpu_times()

pcputimes(user=1.02, system=0.31)

>>> p.cpu_percent(interval=1.0)

12.1

>>> p.cpu_affinity()

[0, 1, 2, 3]

>>> p.cpu_affinity([0])  # set

>>>

>>> p.memory_percent()

0.63423

>>>

>>> p.memory_info()

pmem(rss=7471104, vms=68513792)

>>> p.ext_memory_info()

extmem(rss=9662464, vms=49192960, shared=3612672, text=2564096, lib=0, data=5754880, dirty=0)

>>> p.memory_maps()

[pmmap_grouped(path='/lib/x86_64-linux-gnu/libutil-2.15.so', rss=16384, anonymous=8192, swap=0),

 pmmap_grouped(path='/lib/x86_64-linux-gnu/libc-2.15.so', rss=6384, anonymous=15, swap=0),

 pmmap_grouped(path='/lib/x86_64-linux-gnu/libcrypto.so.1.0.0', rss=34124, anonymous=1245, swap=0),

 pmmap_grouped(path='[heap]', rss=54653, anonymous=8192, swap=0),

 pmmap_grouped(path='[stack]', rss=1542, anonymous=166, swap=0),

 ...]

>>>

>>> p.io_counters()

pio(read_count=478001, write_count=59371, read_bytes=700416, write_bytes=69632)

>>>

>>> p.open_files()

[popenfile(path='/home/giampaolo/svn/psutil/somefile', fd=3)]

>>>

>>> p.connections()

[pconn(fd=115, family=2, type=1, laddr=('10.0.0.1', 48776), raddr=('93.186.135.91', 80), status='ESTABLISHED'),

 pconn(fd=117, family=2, type=1, laddr=('10.0.0.1', 43761), raddr=('72.14.234.100', 80), status='CLOSING'),

 pconn(fd=119, family=2, type=1, laddr=('10.0.0.1', 60759), raddr=('72.14.234.104', 80), status='ESTABLISHED'),

 pconn(fd=123, family=2, type=1, laddr=('10.0.0.1', 51314), raddr=('72.14.234.83', 443), status='SYN_SENT')]

>>>

>>> p.num_threads()

4

>>> p.num_fds()

8

>>> p.threads()

[pthread(id=5234, user_time=22.5, system_time=9.2891),

 pthread(id=5235, user_time=0.0, system_time=0.0),

 pthread(id=5236, user_time=0.0, system_time=0.0),

 pthread(id=5237, user_time=0.0707, system_time=1.1)]

>>>

>>> p.num_ctx_switches()

pctxsw(voluntary=78, involuntary=19)

>>>

>>> p.nice()

0

>>> p.nice(10)  # set

>>>

>>> p.ionice(psutil.IOPRIO_CLASS_IDLE)  # IO priority (Win and Linux only)

>>> p.ionice()

pionice(ioclass=3, value=0)

>>>

>>> p.rlimit(psutil.RLIMIT_NOFILE, (5, 5))  # set resource limits (Linux only)

>>> p.rlimit(psutil.RLIMIT_NOFILE)

(5, 5)

>>>

>>> p.suspend()

>>> p.resume()

>>>

>>> p.terminate()

>>> p.wait(timeout=3)

0

>>>

>>> psutil.test()

USER         PID %CPU %MEM     VSZ     RSS TTY        START    TIME  COMMAND

root           1  0.0  0.0   24584    2240            Jun17   00:00  init

root           2  0.0  0.0       0       0            Jun17   00:00  kthreadd

root           3  0.0  0.0       0       0            Jun17   00:05  ksoftirqd/0

...

giampaolo  31475  0.0  0.0   20760    3024 /dev/pts/0 Jun19   00:00  python2.4

giampaolo  31721  0.0  2.2  773060  181896            00:04   10:30  chrome

root       31763  0.0  0.0       0       0            00:05   00:00  kworker/0:1

>>>

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