psutil模块在获取进程信息方面也提供了很好的支持，包括使用psutil.pids()方法获取所有进程PID

{#7031-1542185592715}1）进程信息

{#1220-1542185011291}#列出所有进程PID

{#4170-1542184715370}>>> import psutil

{#8673-1542184988164}>>> psutil.pids()

{#4580-1542184988165}[1, 2, 3, 5, 7, 8, 9, 10, 12, 13, 14, 15, 16, 17, 18, 19, 25, 26, 27, 28, 36, 38, 39, 40, 59, 91, 227, 233, 234, 235, 236, 239, 251, 256, 257, 324, 430, 451, 456, 480, 3997, 4640, 12449, 12495, 13428, 13481, 13508, 13605, 13664, 13682, 13692, 15000, 19846, 23371, 23422, 24774, 25907, 26079, 26081, 26192, 26194, 26242, 26279, 26280, 26322, 30759]

{#1311-1542185037962}#实例化一个Process对象，参数为一进程PID

{#6721-1542184988165}>>> p = psutil.Process(4640)

{#2430-1542185040683}#进程名

{#2448-1542184988165}>>> p.name()

{#4050-1542184988165}'sshd'

{#1282-1542185095899}#进程bin路径

{#5425-1542184988165}>>> p.exe()

{#2539-1542184988165}'/usr/sbin/sshd'

{#8030-1542185107564}#进程工作目录觉得路径

{#3456-1542184988165}>>> p.cwd()

{#8993-1542184988165}'/'

{#4070-1542185112890}#进程状态

{#9826-1542184988165}>>> p.status()

{#8336-1542184988165}'sleeping'

{#6056-1542185114699}#进程创建时间，时间戳格式

{#9618-1542184988165}>>> p.create_time()

{#5070-1542184988165}1533908809.82

{#9147-1542185117098}#进程uid信息

{#8485-1542184988165}>>> p.uids()

{#5033-1542184988165}puids(real=0, effective=0, saved=0)

{#1994-1542185243115}#进程gid信息

{#9510-1542184988165}>>> p.gids()

{#6345-1542184988165}pgids(real=0, effective=0, saved=0)

{#6097-1542185245162}#进程CPU时间信息，包括user、system两个CPU时间

{#5779-1542184988165}>>> p.cpu_times()

{#4482-1542184988165}pcputimes(user=0.0, system=0.02)

{#1053-1542185247579}#get进程CPU亲和度，如要设置进程CPU亲和度，将CPU号作为参数即可

{#9050-1542184988165}>>> p.cpu_affinity()

{#1484-1542184988165}[0]

{#3492-1542185249323}#进程内存利用率

{#5949-1542184988165}>>> p.memory_percent()

{#7369-1542184988165}0.22893646482172475

{#2939-1542185549882}#进程内存rss、vms信息

{#7820-1542184988165}>>> p.memory_info()

{#8517-1542184988165}pmem(rss=4415488, vms=115519488)

{#2355-1542185555405}#进程IO信息，包括读写IO数及字节数

{#2643-1542184988165}>>> p.io_counters()

{#4064-1542184988165}pio(read_count=67866, write_count=52290, read_bytes=1716224, write_bytes=218906624)

{#3280-1542185433131}#返回打开进程socket的namedutples列表，包括fs、family、laddr等信息

{#4649-1542184988165}>>> p.connections()

{#3391-1542184988165}[pconn(fd=3, family=2, type=1, laddr=('0.0.0.0', 1993), raddr=(), status='LISTEN')]

{#6624-1542185435851}#进程开启的线程数

{#3944-1542184988165}>>> p.num_threads()

{#5417-1542184988165}1

{#7311-1542185738427}2）popen类的使用

{#6566-1542185945532}#通过psutil的Popen方法启动的应用程序，可以跟踪该程序运行的所有相关信息

{#4520-1542185749259}>>> import psutil

{#8268-1542185943315}>>> from subprocess import PIPE

{#5830-1542185943315}>>> p = psutil.Popen(["/usr/bin/python", "-c", "print('hello')"], stdout=PIPE)

{#6696-1542185943315}>>> p.name()

{#6022-1542185943315}'python'

{#2638-1542185943315}>>> p.username()

{#8886-1542185943315}'root'

{#6694-1542185943315}>>> p.communicate()

{#7228-1542185943315}('hello\n', None)
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