Python使用psutil获取进程信息的例子

> p = psutil.Process(27050)
> p
psutil.Process(pid=27050, name='python', started='10:45:29')
> p.name() #进程名
'python'
> p.exe() #进程的bin路径
'/usr/bin/python3.6'
> p.cwd() #进程的工作目录
'/home/len/scripts/python/designmode'
> p.cmdline() #执行进程的命令
['python']
> p.pid #进程的id
27050
> p.ppid() #父进程的id
16586
> p.children() #进程的子进程
[]
> p.parent() #进程的父进程
psutil.Process(pid=16586, name='bash', started='09:08:15')
> p.parents() #进程的所有父进程，可以看到最后是id为1的systemd
[psutil.Process(pid=16586, name='bash', started='09:08:15'), psutil.Process(pid=16585, name='sshd', started='09:08:15'), psutil.Process(pid=16582, name='sshd', started='09:08:14'), psutil.Process(pid=2892, name='sshd', started='2019-06-21 14:53:40'), psutil.Process(pid=1, name='systemd', started='2019-06-21 14:53:21')]
> p.status() #进程状态
'running'
> p.username() #进程用户名
'len'
> p.create_time() #进程创建的时间戳
1564022729.45
> p.terminal() #执行进程的终端
'/dev/pts/0'
> p.uids() #执行进程的用户id
puids(real=1000, effective=1000, saved=1000)
> p.gids() #执行进程的组id
pgids(real=1000, effective=1000, saved=1000)
> p.cpu_times() #进程占用的cpu时间
pcputimes(user=0.35, system=0.08, children_user=0.0, children_system=0.0)
> p.cpu_percent(interval=1.0) #进程占用的cpu比率
0.0
> p.cpu_affinity() #进程cpu亲和度
[0]
> p.cpu_num() #进程占用cpu个数
0
> p.memory_info() #进程内存信息
pmem(rss=10539008, vms=176517120, shared=3698688, text=4096, lib=0, data=6397952, dirty=0)
> p.memory_full_info() #进程完整内存信息
pfullmem(rss=10539008, vms=176517120, shared=3698688, text=4096, lib=0, data=6397952, dirty=0, uss=9244672, pss=9340928, swap=0)
> p.memory_percent() #进程占用内存比率
0.5467627733813867
> p.threads() #进程的线程
[pthread(id=27050, user_time=0.35, system_time=0.08)]
> p.nice() #进程的优先度
0

> p = psutil.Process(1)
> p
psutil.Process(pid=1, name='systemd', started='2019-06-21 14:53:21')
> p.cwd()
Traceback (most recent call last):
 File "/usr/lib64/python3.6/site-packages/psutil/_pslinux.py", line 1513, in wrapper
  return fun(self, *args, **kwargs)
 File "/usr/lib64/python3.6/site-packages/psutil/_pslinux.py", line 1858, in cwd
  return readlink("%s/%s/cwd" % (self._procfs_path, self.pid))
 File "/usr/lib64/python3.6/site-packages/psutil/_pslinux.py", line 213, in readlink
  path = os.readlink(path)
PermissionError: [Errno 13] Permission denied: '/proc/1/cwd'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "/usr/lib64/python3.6/site-packages/psutil/__init__.py", line 828, in cwd
  return self._proc.cwd()
 File "/usr/lib64/python3.6/site-packages/psutil/_pslinux.py", line 1516, in wrapper
  raise AccessDenied(self.pid, self._name)
psutil.AccessDenied: psutil.AccessDenied (pid=1, name='systemd')

> psutil.test()
USER     PID %MEM   VSZ   RSS NICE STATUS START  TIME CMDLINE
root      1  0.2 123.1M  3.8M    sleep Jun21 10:07 /usr/lib/systemd/systemd --switched-root --system --deserialize 22
root      2  0.0  0.0B  0.0B    sleep Jun21 00:00 kthreadd
...
len    26598  0.3 164.4M  6.2M    sleep Jul02 00:00 w3m baidu.com
len    27050  0.6 168.3M  10.2M    runni 10:45 00:00 python

> for p in psutil.process_iter(attrs=['pid', 'name']):
...   if 'kw' in p.info['name']:
...     print(p.info)
... 
{'name': 'kworker/0:0H', 'pid': 5}
{'name': 'kworker/0:1', 'pid': 785}
{'name': 'kworker/0:1H', 'pid': 1063}
{'name': 'kworker/0:2', 'pid': 1306}
{'name': 'kworker/0:0', 'pid': 1828}
{'name': 'kworker/u2:1', 'pid': 15677}
{'name': 'kworker/u2:2', 'pid': 17551}

for p in psutil.process_iter():
  if 'my.cnf' in ' '.join(p.cmdline()):
    print(p.pid)