Detailed explanation of psutil library developed by Python Operation and maintenance

introduce

psutil makes it easy to capture the process and system utilization of a running system.

The import module

import psutils

Get system performance information

CPU information

Get the complete information about CPU using the cpu_times() method:

>>> psutil.cpu_times()

Obtain single data, such as CPU time ratio of user user:

>>> psutil.cpu_times().user

Get the number of CPU:

>>> psutil.cpu_count() #  The default logical=True , get the logical number 
>>> psutil.cpu_count(logical=False) #  To obtain CPU Physical number of 

Memory information

Gets the total physical memory size and used memory:

>>> mem = psutil.virtual_memory()
>>> mem   #  Displays all the parameters 
>>> mem.total #  The total memory 
>>> mem.used  #  Used memory 
>>> mem.free  #  Gets the number of free memory  
>>> psutil.swap_memory() #  To obtain SWAP Partition information 

Disk information

Get full disk information:

>>> psutil.disk_partitions()

Get partition usage:

>>> psutil.disk_usage('C:/') #  The parameter is the disk partition you are on 

Get the total number of IO of hard disk:

>>> psutil.disk_io_counters()
>>> psutil.disk_io_counters(perdisk=True) #  Gets a single partition IO The number of 

The network information

Obtain total IO information of the network:

>>> psutil.net_io_counters()
>>> psutil.net_io_counters(pernic=True) #  Outputs a single network interface IO information 

Other system information

Return the user information of the current login system:

>>> psutil.users()

Get boot time:

>>> psutil.cpu_times()

0

Process management

Process information

List all processes PID

>>> psutil.cpu_times()

1

Instantiate the process object

>>> psutil.cpu_times()

2

The use of the popen class

The popen class gets information about the application process that the user started.

>>> p = putil.Popen(["/usr/bin/python","-c","print('Hello')"],stdout=subprocess.PIPE)
>>> p.name()
>>> p.username() #  The user who created the process 
>>> p.communicate()
('hello\n',None)
>>> p.cpu_times() #  Gets the process running CPU time