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.. module:: psutil
:synopsis: psutil module
.. moduleauthor:: Giampaolo Rodola' <grodola@gmail.com>
.. warning::
This documentation refers to new 2.X version of psutil.
Instructions on how to port existing 1.2.1 code are
`here <http://grodola.blogspot.com/2014/01/psutil-20-porting.html>`__.
Old 1.2.1 documentation is still available
`here <https://code.google.com/p/psutil/wiki/Documentation>`__.
psutil documentation
====================
Quick links
-----------
* `Home page <https://github.com/giampaolo/psutil>`__
* `Blog <http://grodola.blogspot.com/search/label/psutil>`__
* `Forum <http://groups.google.com/group/psutil/topics>`__
* `Download <https://pypi.python.org/pypi?:action=display&name=psutil#downloads>`__
* `Installation <https://github.com/giampaolo/psutil/blob/master/INSTALL.rst>`_
* `Development guide <https://github.com/giampaolo/psutil/blob/master/DEVGUIDE.rst>`_
* `What's new <https://github.com/giampaolo/psutil/blob/master/HISTORY.rst>`__
About
-----
From project's home page:
psutil (python system and process utilities) is a cross-platform library for
retrieving information on running
**processes** and **system utilization** (CPU, memory, disks, network) in
**Python**.
It is useful mainly for **system monitoring**, **profiling** and **limiting
process resources** and **management of running processes**.
It implements many functionalities offered by command line tools
such as: *ps, top, lsof, netstat, ifconfig, who, df, kill, free, nice,
ionice, iostat, iotop, uptime, pidof, tty, taskset, pmap*.
It currently supports **Linux, Windows, OSX, FreeBSD** and **Sun Solaris**,
both **32-bit** and **64-bit** architectures, with Python versions from
**2.6 to 3.4** (users of Python 2.4 and 2.5 may use `2.1.3 <https://pypi.python.org/pypi?name=psutil&version=2.1.3&:action=files>`__ version).
`PyPy <http://pypy.org/>`__ is also known to work.
The psutil documentation you're reading is distributed as a single HTML page.
System related functions
========================
CPU
---
.. function:: cpu_times(percpu=False)
Return system CPU times as a namedtuple.
Every attribute represents the seconds the CPU has spent in the given mode.
The attributes availability varies depending on the platform:
- **user**
- **system**
- **idle**
- **nice** *(UNIX)*
- **iowait** *(Linux)*
- **irq** *(Linux, FreeBSD)*
- **softirq** *(Linux)*
- **steal** *(Linux 2.6.11+)*
- **guest** *(Linux 2.6.24+)*
- **guest_nice** *(Linux 3.2.0+)*
When *percpu* is ``True`` return a list of namedtuples for each logical CPU
on the system.
First element of the list refers to first CPU, second element to second CPU
and so on.
The order of the list is consistent across calls.
Example output on Linux:
>>> import psutil
>>> psutil.cpu_times()
scputimes(user=17411.7, nice=77.99, system=3797.02, idle=51266.57, iowait=732.58, irq=0.01, softirq=142.43, steal=0.0, guest=0.0, guest_nice=0.0)
.. function:: cpu_percent(interval=None, percpu=False)
Return a float representing the current system-wide CPU utilization as a
percentage. When *interval* is > ``0.0`` compares system CPU times elapsed
before and after the interval (blocking).
When *interval* is ``0.0`` or ``None`` compares system CPU times elapsed
since last call or module import, returning immediately.
That means the first time this is called it will return a meaningless ``0.0``
value which you are supposed to ignore.
In this case is recommended for accuracy that this function be called with at
least ``0.1`` seconds between calls.
When *percpu* is ``True`` returns a list of floats representing the
utilization as a percentage for each CPU.
First element of the list refers to first CPU, second element to second CPU
and so on. The order of the list is consistent across calls.
>>> import psutil
>>> # blocking
>>> psutil.cpu_percent(interval=1)
2.0
>>> # non-blocking (percentage since last call)
>>> psutil.cpu_percent(interval=None)
2.9
>>> # blocking, per-cpu
>>> psutil.cpu_percent(interval=1, percpu=True)
[2.0, 1.0]
>>>
.. warning::
the first time this function is called with *interval* = ``0.0`` or ``None``
it will return a meaningless ``0.0`` value which you are supposed to
ignore.
.. function:: cpu_times_percent(interval=None, percpu=False)
Same as :func:`cpu_percent()` but provides utilization percentages for each
specific CPU time as is returned by
:func:`psutil.cpu_times(percpu=True)<cpu_times()>`.
*interval* and
*percpu* arguments have the same meaning as in :func:`cpu_percent()`.
.. warning::
the first time this function is called with *interval* = ``0.0`` or
``None`` it will return a meaningless ``0.0`` value which you are supposed
to ignore.
.. function:: cpu_count(logical=True)
Return the number of logical CPUs in the system (same as
`os.cpu_count() <http://docs.python.org/3/library/os.html#os.cpu_count>`__
in Python 3.4).
If *logical* is ``False`` return the number of physical cores only (hyper
thread CPUs are excluded). Return ``None`` if undetermined.
>>> import psutil
>>> psutil.cpu_count()
4
>>> psutil.cpu_count(logical=False)
2
>>>
Memory
------
.. function:: virtual_memory()
Return statistics about system memory usage as a namedtuple including the
following fields, expressed in bytes:
- **total**: total physical memory available.
- **available**: the actual amount of available memory that can be given
instantly to processes that request more memory in bytes; this is
calculated by summing different memory values depending on the platform
(e.g. free + buffers + cached on Linux) and it is supposed to be used to
monitor actual memory usage in a cross platform fashion.
- **percent**: the percentage usage calculated as
``(total - available) / total * 100``.
- **used**: memory used, calculated differently depending on the platform and
designed for informational purposes only.
- **free**: memory not being used at all (zeroed) that is readily available;
note that this doesn't reflect the actual memory available (use 'available'
instead).
Platform-specific fields:
- **active**: (UNIX): memory currently in use or very recently used, and so
it is in RAM.
- **inactive**: (UNIX): memory that is marked as not used.
- **buffers**: (Linux, BSD): cache for things like file system metadata.
- **cached**: (Linux, BSD): cache for various things.
- **wired**: (BSD, OSX): memory that is marked to always stay in RAM. It is
never moved to disk.
- **shared**: (BSD): memory that may be simultaneously accessed by multiple
processes.
The sum of **used** and **available** does not necessarily equal **total**.
On Windows **available** and **free** are the same.
See `examples/meminfo.py <https://github.com/giampaolo/psutil/blob/master/examples/meminfo.py>`__
script providing an example on how to convert bytes in a human readable form.
>>> import psutil
>>> mem = psutil.virtual_memory()
>>> mem
svmem(total=8374149120L, available=1247768576L, percent=85.1, used=8246628352L, free=127520768L, active=3208777728, inactive=1133408256, buffers=342413312L, cached=777834496)
>>>
>>> THRESHOLD = 100 * 1024 * 1024 # 100MB
>>> if mem.available <= THRESHOLD:
... print("warning")
...
>>>
.. function:: swap_memory()
Return system swap memory statistics as a namedtuple including the following
fields:
* **total**: total swap memory in bytes
* **used**: used swap memory in bytes
* **free**: free swap memory in bytes
* **percent**: the percentage usage calculated as ``(total - available) / total * 100``
* **sin**: the number of bytes the system has swapped in from disk
(cumulative)
* **sout**: the number of bytes the system has swapped out from disk
(cumulative)
**sin** and **sout** on Windows are meaningless and are always set to ``0``.
See `examples/meminfo.py <https://github.com/giampaolo/psutil/blob/master/examples/meminfo.py>`__
script providing an example on how to convert bytes in a human readable form.
>>> import psutil
>>> psutil.swap_memory()
sswap(total=2097147904L, used=886620160L, free=1210527744L, percent=42.3, sin=1050411008, sout=1906720768)
Disks
-----
.. function:: disk_partitions(all=False)
Return all mounted disk partitions as a list of namedtuples including device,
mount point and filesystem type, similarly to "df" command on UNIX. If *all*
parameter is ``False`` return physical devices only (e.g. hard disks, cd-rom
drives, USB keys) and ignore all others (e.g. memory partitions such as
`/dev/shm <http://www.cyberciti.biz/tips/what-is-devshm-and-its-practical-usage.html>`__).
Namedtuple's **fstype** field is a string which varies depending on the
platform.
On Linux it can be one of the values found in /proc/filesystems (e.g.
``'ext3'`` for an ext3 hard drive o ``'iso9660'`` for the CD-ROM drive).
On Windows it is determined via
`GetDriveType <http://msdn.microsoft.com/en-us/library/aa364939(v=vs.85).aspx>`__
and can be either ``"removable"``, ``"fixed"``, ``"remote"``, ``"cdrom"``,
``"unmounted"`` or ``"ramdisk"``. On OSX and FreeBSD it is retrieved via
`getfsstat(2) <http://www.manpagez.com/man/2/getfsstat/>`__. See
`disk_usage.py <https://github.com/giampaolo/psutil/blob/master/examples/disk_usage.py>`__
script providing an example usage.
>>> import psutil
>>> psutil.disk_partitions()
[sdiskpart(device='/dev/sda3', mountpoint='/', fstype='ext4', opts='rw,errors=remount-ro'),
sdiskpart(device='/dev/sda7', mountpoint='/home', fstype='ext4', opts='rw')]
.. function:: disk_usage(path)
Return disk usage statistics about the given *path* as a namedtuple including
**total**, **used** and **free** space expressed in bytes, plus the
**percentage** usage.
`OSError <http://docs.python.org/3/library/exceptions.html#OSError>`__ is
raised if *path* does not exist. See
`examples/disk_usage.py <https://github.com/giampaolo/psutil/blob/master/examples/disk_usage.py>`__
script providing an example usage. Starting from
`Python 3.3 <http://bugs.python.org/issue12442>`__ this is also
available as
`shutil.disk_usage() <http://docs.python.org/3/library/shutil.html#shutil.disk_usage>`__.
See
`disk_usage.py <https://github.com/giampaolo/psutil/blob/master/examples/disk_usage.py>`__
script providing an example usage.
>>> import psutil
>>> psutil.disk_usage('/')
sdiskusage(total=21378641920, used=4809781248, free=15482871808, percent=22.5)
.. function:: disk_io_counters(perdisk=False)
Return system-wide disk I/O statistics as a namedtuple including the
following fields:
- **read_count**: number of reads
- **write_count**: number of writes
- **read_bytes**: number of bytes read
- **write_bytes**: number of bytes written
- **read_time**: time spent reading from disk (in milliseconds)
- **write_time**: time spent writing to disk (in milliseconds)
If *perdisk* is ``True`` return the same information for every physical disk
installed on the system as a dictionary with partition names as the keys and
the namedtuple described above as the values.
See `examples/iotop.py <https://github.com/giampaolo/psutil/blob/master/examples/iotop.py>`__
for an example application.
>>> import psutil
>>> psutil.disk_io_counters()
sdiskio(read_count=8141, write_count=2431, read_bytes=290203, write_bytes=537676, read_time=5868, write_time=94922)
>>>
>>> psutil.disk_io_counters(perdisk=True)
{'sda1': sdiskio(read_count=920, write_count=1, read_bytes=2933248, write_bytes=512, read_time=6016, write_time=4),
'sda2': sdiskio(read_count=18707, write_count=8830, read_bytes=6060, write_bytes=3443, read_time=24585, write_time=1572),
'sdb1': sdiskio(read_count=161, write_count=0, read_bytes=786432, write_bytes=0, read_time=44, write_time=0)}
Network
-------
.. function:: net_io_counters(pernic=False)
Return system-wide network I/O statistics as a namedtuple including the
following attributes:
- **bytes_sent**: number of bytes sent
- **bytes_recv**: number of bytes received
- **packets_sent**: number of packets sent
- **packets_recv**: number of packets received
- **errin**: total number of errors while receiving
- **errout**: total number of errors while sending
- **dropin**: total number of incoming packets which were dropped
- **dropout**: total number of outgoing packets which were dropped (always 0
on OSX and BSD)
If *pernic* is ``True`` return the same information for every network
interface installed on the system as a dictionary with network interface
names as the keys and the namedtuple described above as the values.
See `examples/nettop.py <https://github.com/giampaolo/psutil/blob/master/examples/nettop.py>`__
for an example application.
>>> import psutil
>>> psutil.net_io_counters()
snetio(bytes_sent=14508483, bytes_recv=62749361, packets_sent=84311, packets_recv=94888, errin=0, errout=0, dropin=0, dropout=0)
>>>
>>> psutil.net_io_counters(pernic=True)
{'lo': snetio(bytes_sent=547971, bytes_recv=547971, packets_sent=5075, packets_recv=5075, errin=0, errout=0, dropin=0, dropout=0),
'wlan0': snetio(bytes_sent=13921765, bytes_recv=62162574, packets_sent=79097, packets_recv=89648, errin=0, errout=0, dropin=0, dropout=0)}
.. function:: net_connections(kind='inet')
Return system-wide socket connections as a list of namedtuples.
Every namedtuple provides 7 attributes:
- **fd**: the socket file descriptor, if retrievable, else ``-1``.
If the connection refers to the current process this may be passed to
`socket.fromfd() <http://docs.python.org/library/socket.html#socket.fromfd>`__
to obtain a usable socket object.
- **family**: the address family, either `AF_INET
<http://docs.python.org//library/socket.html#socket.AF_INET>`__,
`AF_INET6 <http://docs.python.org//library/socket.html#socket.AF_INET6>`__
or `AF_UNIX <http://docs.python.org//library/socket.html#socket.AF_UNIX>`__.
- **type**: the address type, either `SOCK_STREAM
<http://docs.python.org//library/socket.html#socket.SOCK_STREAM>`__ or
`SOCK_DGRAM
<http://docs.python.org//library/socket.html#socket.SOCK_DGRAM>`__.
- **laddr**: the local address as a ``(ip, port)`` tuple or a ``path``
in case of AF_UNIX sockets.
- **raddr**: the remote address as a ``(ip, port)`` tuple or an absolute
``path`` in case of UNIX sockets.
When the remote endpoint is not connected you'll get an empty tuple
(AF_INET*) or ``None`` (AF_UNIX).
On Linux AF_UNIX sockets will always have this set to ``None``.
- **status**: represents the status of a TCP connection. The return value
is one of the :data:`psutil.CONN_* <psutil.CONN_ESTABLISHED>` constants
(a string).
For UDP and UNIX sockets this is always going to be
:const:`psutil.CONN_NONE`.
- **pid**: the PID of the process which opened the socket, if retrievable,
else ``None``. On some platforms (e.g. Linux) the availability of this
field changes depending on process privileges (root is needed).
The *kind* parameter is a string which filters for connections that fit the
following criteria:
.. table::
+----------------+-----------------------------------------------------+
| **Kind value** | **Connections using** |
+================+=====================================================+
| "inet" | IPv4 and IPv6 |
+----------------+-----------------------------------------------------+
| "inet4" | IPv4 |
+----------------+-----------------------------------------------------+
| "inet6" | IPv6 |
+----------------+-----------------------------------------------------+
| "tcp" | TCP |
+----------------+-----------------------------------------------------+
| "tcp4" | TCP over IPv4 |
+----------------+-----------------------------------------------------+
| "tcp6" | TCP over IPv6 |
+----------------+-----------------------------------------------------+
| "udp" | UDP |
+----------------+-----------------------------------------------------+
| "udp4" | UDP over IPv4 |
+----------------+-----------------------------------------------------+
| "udp6" | UDP over IPv6 |
+----------------+-----------------------------------------------------+
| "unix" | UNIX socket (both UDP and TCP protocols) |
+----------------+-----------------------------------------------------+
| "all" | the sum of all the possible families and protocols |
+----------------+-----------------------------------------------------+
On OSX this function requires root privileges.
To get per-process connections use :meth:`Process.connections`.
Also, see
`netstat.py sample script <https://github.com/giampaolo/psutil/blob/master/examples/netstat.py>`__.
Example:
>>> import psutil
>>> psutil.net_connections()
[pconn(fd=115, family=<AddressFamily.AF_INET: 2>, type=<SocketType.SOCK_STREAM: 1>, laddr=('10.0.0.1', 48776), raddr=('93.186.135.91', 80), status='ESTABLISHED', pid=1254),
pconn(fd=117, family=<AddressFamily.AF_INET: 2>, type=<SocketType.SOCK_STREAM: 1>, laddr=('10.0.0.1', 43761), raddr=('72.14.234.100', 80), status='CLOSING', pid=2987),
pconn(fd=-1, family=<AddressFamily.AF_INET: 2>, type=<SocketType.SOCK_STREAM: 1>, laddr=('10.0.0.1', 60759), raddr=('72.14.234.104', 80), status='ESTABLISHED', pid=None),
pconn(fd=-1, family=<AddressFamily.AF_INET: 2>, type=<SocketType.SOCK_STREAM: 1>, laddr=('10.0.0.1', 51314), raddr=('72.14.234.83', 443), status='SYN_SENT', pid=None)
...]
.. note:: (OSX) :class:`psutil.AccessDenied` is always raised unless running
as root (lsof does the same).
.. note:: (Solaris) UNIX sockets are not supported.
.. versionadded:: 2.1.0
.. function:: net_if_addrs()
Return the addresses associated to each NIC (network interface card)
installed on the system as a dictionary whose keys are the NIC names and
value is a list of namedtuples for each address assigned to the NIC.
Each namedtuple includes 4 fields:
- **family**
- **address**
- **netmask**
- **broadcast**
*family* can be either
`AF_INET <http://docs.python.org//library/socket.html#socket.AF_INET>`__,
`AF_INET6 <http://docs.python.org//library/socket.html#socket.AF_INET6>`__
or :const:`psutil.AF_LINK`, which refers to a MAC address.
*address* is the primary address, *netmask* and *broadcast* may be ``None``.
Example::
>>> import psutil
>>> psutil.net_if_addrs()
{'lo': [snic(family=<AddressFamily.AF_INET: 2>, address='127.0.0.1', netmask='255.0.0.0', broadcast='127.0.0.1'),
snic(family=<AddressFamily.AF_INET6: 10>, address='::1', netmask='ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff', broadcast=None),
snic(family=<AddressFamily.AF_LINK: 17>, address='00:00:00:00:00:00', netmask=None, broadcast='00:00:00:00:00:00')],
'wlan0': [snic(family=<AddressFamily.AF_INET: 2>, address='192.168.1.3', netmask='255.255.255.0', broadcast='192.168.1.255'),
snic(family=<AddressFamily.AF_INET6: 10>, address='fe80::c685:8ff:fe45:641%wlan0', netmask='ffff:ffff:ffff:ffff::', broadcast=None),
snic(family=<AddressFamily.AF_LINK: 17>, address='c4:85:08:45:06:41', netmask=None, broadcast='ff:ff:ff:ff:ff:ff')]}
>>>
See also `examples/ifconfig.py <https://github.com/giampaolo/psutil/blob/master/examples/ifconfig.py>`__
for an example application.
.. note:: if you're interested in others families (e.g. AF_BLUETOOTH) you can
use the more powerful `netifaces <https://pypi.python.org/pypi/netifaces/>`__
extension.
.. note:: you can have more than one address of the same family associated
with each interface (that's why dict values are lists).
*New in 3.0.0*
.. function:: net_if_stats()
Return information about each NIC (network interface card) installed on the
system as a dictionary whose keys are the NIC names and value is a namedtuple
with the following fields:
- **isup**
- **duplex**
- **speed**
- **mtu**
*isup* is a boolean indicating whether the NIC is up and running, *duplex*
can be either :const:`NIC_DUPLEX_FULL`, :const:`NIC_DUPLEX_HALF` or
:const:`NIC_DUPLEX_UNKNOWN`, *speed* is the NIC speed expressed in mega bits
(MB), if it can't be determined (e.g. 'localhost') it will be set to ``0``,
*mtu* is the maximum transmission unit expressed in bytes.
See also `examples/ifconfig.py <https://github.com/giampaolo/psutil/blob/master/examples/ifconfig.py>`__
for an example application.
Example:
>>> import psutil
>>> psutil.net_if_stats()
{'eth0': snicstats(isup=True, duplex=<NicDuplex.NIC_DUPLEX_FULL: 2>, speed=100, mtu=1500),
'lo': snicstats(isup=True, duplex=<NicDuplex.NIC_DUPLEX_UNKNOWN: 0>, speed=0, mtu=65536)}
*New in 3.0.0*
Other system info
-----------------
.. function:: users()
Return users currently connected on the system as a list of namedtuples
including the following fields:
- **user**: the name of the user.
- **terminal**: the tty or pseudo-tty associated with the user, if any,
else ``None``.
- **host**: the host name associated with the entry, if any.
- **started**: the creation time as a floating point number expressed in
seconds since the epoch.
Example::
>>> import psutil
>>> psutil.users()
[suser(name='giampaolo', terminal='pts/2', host='localhost', started=1340737536.0),
suser(name='giampaolo', terminal='pts/3', host='localhost', started=1340737792.0)]
.. function:: boot_time()
Return the system boot time expressed in seconds since the epoch.
Example:
.. code-block:: python
>>> import psutil, datetime
>>> psutil.boot_time()
1389563460.0
>>> datetime.datetime.fromtimestamp(psutil.boot_time()).strftime("%Y-%m-%d %H:%M:%S")
'2014-01-12 22:51:00'
Processes
=========
Functions
---------
.. function:: pids()
Return a list of current running PIDs. To iterate over all processes
:func:`process_iter()` should be preferred.
.. function:: pid_exists(pid)
Check whether the given PID exists in the current process list. This is
faster than doing ``"pid in psutil.pids()"`` and should be preferred.
.. function:: process_iter()
Return an iterator yielding a :class:`Process` class instance for all running
processes on the local machine.
Every instance is only created once and then cached into an internal table
which is updated every time an element is yielded.
Cached :class:`Process` instances are checked for identity so that you're
safe in case a PID has been reused by another process, in which case the
cached instance is updated.
This is should be preferred over :func:`psutil.pids()` for iterating over
processes.
Sorting order in which processes are returned is
based on their PID. Example usage::
import psutil
for proc in psutil.process_iter():
try:
pinfo = proc.as_dict(attrs=['pid', 'name'])
except psutil.NoSuchProcess:
pass
else:
print(pinfo)
.. function:: wait_procs(procs, timeout=None, callback=None)
Convenience function which waits for a list of :class:`Process` instances to
terminate. Return a ``(gone, alive)`` tuple indicating which processes are
gone and which ones are still alive. The *gone* ones will have a new
*returncode* attribute indicating process exit status (it may be ``None``).
``callback`` is a function which gets called every time a process terminates
(a :class:`Process` instance is passed as callback argument). Function will
return as soon as all processes terminate or when timeout occurs. Tipical use
case is:
- send SIGTERM to a list of processes
- give them some time to terminate
- send SIGKILL to those ones which are still alive
Example::
import psutil
def on_terminate(proc):
print("process {} terminated with exit code {}".format(proc, proc.returncode))
procs = [...] # a list of Process instances
for p in procs:
p.terminate()
gone, alive = wait_procs(procs, timeout=3, callback=on_terminate)
for p in alive:
p.kill()
Exceptions
----------
.. class:: Error()
Base exception class. All other exceptions inherit from this one.
.. class:: NoSuchProcess(pid, name=None, msg=None)
Raised by :class:`Process` class methods when no process with the given
*pid* is found in the current process list or when a process no longer
exists. "name" is the name the process had before disappearing
and gets set only if :meth:`Process.name()` was previosly called.
.. class:: ZombieProcess(pid, name=None, ppid=None, msg=None)
This may be raised by :class:`Process` class methods when querying a zombie
process on UNIX (Windows doesn't have zombie processes). Depending on the
method called the OS may be able to succeed in retrieving the process
information or not.
Note: this is a subclass of :class:`NoSuchProcess` so if you're not
interested in retrieving zombies (e.g. when using :func:`process_iter()`)
you can ignore this exception and just catch :class:`NoSuchProcess`.
*New in 3.0.0*
.. class:: AccessDenied(pid=None, name=None, msg=None)
Raised by :class:`Process` class methods when permission to perform an
action is denied. "name" is the name of the process (may be ``None``).
.. class:: TimeoutExpired(seconds, pid=None, name=None, msg=None)
Raised by :meth:`Process.wait` if timeout expires and process is still
alive.
Process class
-------------
.. class:: Process(pid=None)
Represents an OS process with the given *pid*. If *pid* is omitted current
process *pid* (`os.getpid() <http://docs.python.org/library/os.html#os.getpid>`__)
is used.
Raise :class:`NoSuchProcess` if *pid* does not exist.
When accessing methods of this class always be prepared to catch
:class:`NoSuchProcess` and :class:`AccessDenied` exceptions.
`hash() <http://docs.python.org/2/library/functions.html#hash>`__ builtin can
be used against instances of this class in order to identify a process
univocally over time (the hash is determined by mixing process PID
and creation time). As such it can also be used with
`set()s <http://docs.python.org/2/library/stdtypes.html#types-set>`__.
.. warning::
the way this class is bound to a process is uniquely via its **PID**.
That means that if the :class:`Process` instance is old enough and
the PID has been reused by another process in the meantime you might end up
interacting with another process.
The only exceptions for which process identity is pre-emptively checked
(via PID + creation time) and guaranteed are for
:meth:`nice` (set),
:meth:`ionice` (set),
:meth:`cpu_affinity` (set),
:meth:`rlimit` (set),
:meth:`children`,
:meth:`parent`,
:meth:`suspend`
:meth:`resume`,
:meth:`send_signal`,
:meth:`terminate`, and
:meth:`kill`
methods.
To prevent this problem for all other methods you can use
:meth:`is_running()` before querying the process or use
:func:`process_iter()` in case you're iterating over all processes.
.. attribute:: pid
The process PID.
.. method:: ppid()
The process parent pid. On Windows the return value is cached after first
call.
.. method:: name()
The process name. The return value is cached after first call.
.. method:: exe()
The process executable as an absolute path.
On some systems this may also be an empty string.
The return value is cached after first call.
.. method:: cmdline()
The command line this process has been called with.
.. method:: create_time()
The process creation time as a floating point number expressed in seconds
since the epoch, in
`UTC <http://en.wikipedia.org/wiki/Coordinated_universal_time>`__.
The return value is cached after first call.
>>> import psutil, datetime
>>> p = psutil.Process()
>>> p.create_time()
1307289803.47
>>> datetime.datetime.fromtimestamp(p.create_time()).strftime("%Y-%m-%d %H:%M:%S")
'2011-03-05 18:03:52'
.. method:: as_dict(attrs=None, ad_value=None)
Utility method returning process information as a hashable dictionary.
If *attrs* is specified it must be a list of strings reflecting available
:class:`Process` class's attribute names (e.g. ``['cpu_times', 'name']``)
else all public (read only) attributes are assumed. *ad_value* is the
value which gets assigned to a dict key in case :class:`AccessDenied`
or :class:`ZombieProcess` exception is raised when retrieving that
particular process information.
>>> import psutil
>>> p = psutil.Process()
>>> p.as_dict(attrs=['pid', 'name', 'username'])
{'username': 'giampaolo', 'pid': 12366, 'name': 'python'}
.. versionchanged:: 3.0.0 *ad_value* is used also when incurring into
:class:`ZombieProcess` exception, not only :class:`AccessDenied`
.. method:: parent()
Utility method which returns the parent process as a :class:`Process`
object pre-emptively checking whether PID has been reused. If no parent
PID is known return ``None``.
.. method:: status()
The current process status as a string. The returned string is one of the
:data:`psutil.STATUS_*<psutil.STATUS_RUNNING>` constants.
.. method:: cwd()
The process current working directory as an absolute path.
.. method:: username()
The name of the user that owns the process. On UNIX this is calculated by
using real process uid.
.. method:: uids()
The **real**, **effective** and **saved** user ids of this process as a
namedtuple. This is the same as
`os.getresuid() <http://docs.python.org//library/os.html#os.getresuid>`__
but can be used for every process PID.
Availability: UNIX
.. method:: gids()
The **real**, **effective** and **saved** group ids of this process as a
namedtuple. This is the same as
`os.getresgid() <http://docs.python.org//library/os.html#os.getresgid>`__
but can be used for every process PID.
Availability: UNIX
.. method:: terminal()
The terminal associated with this process, if any, else ``None``. This is
similar to "tty" command but can be used for every process PID.
Availability: UNIX
.. method:: nice(value=None)
Get or set process
`niceness <blogs.techrepublic.com.com/opensource/?p=140>`__ (priority).
On UNIX this is a number which usually goes from ``-20`` to ``20``.
The higher the nice value, the lower the priority of the process.
>>> import psutil
>>> p = psutil.Process()
>>> p.nice(10) # set
>>> p.nice() # get
10
>>>
Starting from `Python 3.3 <http://bugs.python.org/issue10784>`__ this
functionality is also available as
`os.getpriority() <http://docs.python.org/3/library/os.html#os.getpriority>`__
and
`os.setpriority() <http://docs.python.org/3/library/os.html#os.setpriority>`__
(UNIX only).
On Windows this is available as well by using
`GetPriorityClass <http://msdn.microsoft.com/en-us/library/ms683211(v=vs.85).aspx>`__
and `SetPriorityClass <http://msdn.microsoft.com/en-us/library/ms686219(v=vs.85).aspx>`__
and *value* is one of the
:data:`psutil.*_PRIORITY_CLASS <psutil.ABOVE_NORMAL_PRIORITY_CLASS>`
constants.
Example which increases process priority on Windows:
>>> p.nice(psutil.HIGH_PRIORITY_CLASS)
.. method:: ionice(ioclass=None, value=None)
Get or set
`process I/O niceness <http://friedcpu.wordpress.com/2007/07/17/why-arent-you-using-ionice-yet/>`__ (priority).
On Linux *ioclass* is one of the
:data:`psutil.IOPRIO_CLASS_*<psutil.IOPRIO_CLASS_NONE>` constants.
*value* is a number which goes from ``0`` to ``7``. The higher the value,
the lower the I/O priority of the process. On Windows only *ioclass* is
used and it can be set to ``2`` (normal), ``1`` (low) or ``0`` (very low).
The example below sets IDLE priority class for the current process,
meaning it will only get I/O time when no other process needs the disk:
>>> import psutil
>>> p = psutil.Process()
>>> p.ionice(psutil.IOPRIO_CLASS_IDLE) # set
>>> p.ionice() # get
pionice(ioclass=<IOPriority.IOPRIO_CLASS_IDLE: 3>, value=0)
>>>
On Windows only *ioclass* is used and it can be set to ``2`` (normal),
``1`` (low) or ``0`` (very low).
Availability: Linux and Windows > Vista
.. versionchanged:: 3.0.0 on >= Python 3.4 the returned ``ioclass``
constant is an `enum <https://docs.python.org/3/library/enum.html#module-enum>`__
instead of a plain integer.
.. method:: rlimit(resource, limits=None)
Get or set process resource limits (see
`man prlimit <http://linux.die.net/man/2/prlimit>`__). *resource* is one of
the :data:`psutil.RLIMIT_* <psutil.RLIMIT_INFINITY>` constants.
*limits* is a ``(soft, hard)`` tuple.
This is the same as `resource.getrlimit() <http://docs.python.org/library/resource.html#resource.getrlimit>`__
and `resource.setrlimit() <http://docs.python.org/library/resource.html#resource.setrlimit>`__
but can be used for every process PID and only on Linux.
Example:
>>> import psutil
>>> p = psutil.Process()
>>> # process may open no more than 128 file descriptors
>>> p.rlimit(psutil.RLIMIT_NOFILE, (128, 128))
>>> # process may create files no bigger than 1024 bytes
>>> p.rlimit(psutil.RLIMIT_FSIZE, (1024, 1024))
>>> # get
>>> p.rlimit(psutil.RLIMIT_FSIZE)
(1024, 1024)
>>>
Availability: Linux
.. method:: io_counters()
Return process I/O statistics as a namedtuple including the number of read
and write operations performed by the process and the amount of bytes read
and written. For Linux refer to
`/proc filesysem documentation <https://www.kernel.org/doc/Documentation/filesystems/proc.txt>`__.
On BSD there's apparently no way to retrieve bytes counters, hence ``-1``
is returned for **read_bytes** and **write_bytes** fields. OSX is not
supported.
>>> import psutil
>>> p = psutil.Process()
>>> p.io_counters()
pio(read_count=454556, write_count=3456, read_bytes=110592, write_bytes=0)
Availability: all platforms except OSX and Solaris
.. method:: num_ctx_switches()
The number voluntary and involuntary context switches performed by
this process.
.. method:: num_fds()
The number of file descriptors used by this process.
Availability: UNIX
.. method:: num_handles()
The number of handles used by this process.
Availability: Windows
.. method:: num_threads()
The number of threads currently used by this process.
.. method:: threads()
Return threads opened by process as a list of namedtuples including thread
id and thread CPU times (user/system).
.. method:: cpu_times()
Return a tuple whose values are process CPU **user** and **system**
times which means the amount of time expressed in seconds that a process
has spent in
`user / system mode <http://stackoverflow.com/questions/556405/what-do-real-user-and-sys-mean-in-the-output-of-time1>`__.
This is similar to
`os.times() <http://docs.python.org//library/os.html#os.times>`__
but can be used for every process PID.
.. method:: cpu_percent(interval=None)
Return a float representing the process CPU utilization as a percentage.
When *interval* is > ``0.0`` compares process times to system CPU times
elapsed before and after the interval (blocking). When interval is ``0.0``
or ``None`` compares process times to system CPU times elapsed since last
call, returning immediately. That means the first time this is called it
will return a meaningless ``0.0`` value which you are supposed to ignore.
In this case is recommended for accuracy that this function be called a
second time with at least ``0.1`` seconds between calls. Example:
>>> import psutil
>>> p = psutil.Process()
>>>
>>> # blocking
>>> p.cpu_percent(interval=1)
2.0
>>> # non-blocking (percentage since last call)
>>> p.cpu_percent(interval=None)
2.9
>>>
.. note::
a percentage > 100 is legitimate as it can result from a process with
multiple threads running on different CPU cores.
.. warning::
the first time this method is called with interval = ``0.0`` or
``None`` it will return a meaningless ``0.0`` value which you are
supposed to ignore.
.. method:: cpu_affinity(cpus=None)
Get or set process current
`CPU affinity <http://www.linuxjournal.com/article/6799?page=0,0>`__.
CPU affinity consists in telling the OS to run a certain process on a
limited set of CPUs only. The number of eligible CPUs can be obtained with
``list(range(psutil.cpu_count()))``. On set raises ``ValueError`` in case
an invalid CPU number is specified.
>>> import psutil
>>> psutil.cpu_count()
4
>>> p = psutil.Process()
>>> p.cpu_affinity() # get
[0, 1, 2, 3]
>>> p.cpu_affinity([0]) # set; from now on, process will run on CPU #0 only
>>> p.cpu_affinity()
[0]
>>>
>>> # reset affinity against all CPUs
>>> all_cpus = list(range(psutil.cpu_count()))
>>> p.cpu_affinity(all_cpus)
>>>
Availability: Linux, Windows, BSD
.. versionchanged:: 2.2.0 added support for FreeBSD
.. method:: memory_info()
Return a tuple representing RSS (Resident Set Size) and VMS (Virtual
Memory Size) in bytes. On UNIX *rss* and *vms* are the same values shown
by ps. On Windows *rss* and *vms* refer to "Mem Usage" and "VM Size"
columns of taskmgr.exe. For more detailed memory stats use
:meth:`memory_info_ex`.
.. method:: memory_info_ex()
Return a namedtuple with variable fields depending on the platform
representing extended memory information about the process.
All numbers are expressed in bytes.
+--------+---------+-------+-------+--------------------+
| Linux | OSX | BSD | SunOS | Windows |
+========+=========+=======+=======+====================+
| rss | rss | rss | rss | num_page_faults |
+--------+---------+-------+-------+--------------------+
| vms | vms | vms | vms | peak_wset |
+--------+---------+-------+-------+--------------------+
| shared | pfaults | text | | wset |
+--------+---------+-------+-------+--------------------+
| text | pageins | data | | peak_paged_pool |
+--------+---------+-------+-------+--------------------+
| lib | | stack | | paged_pool |
+--------+---------+-------+-------+--------------------+
| data | | | | peak_nonpaged_pool |
+--------+---------+-------+-------+--------------------+
| dirty | | | | nonpaged_pool |
+--------+---------+-------+-------+--------------------+
| | | | | pagefile |
+--------+---------+-------+-------+--------------------+
| | | | | peak_pagefile |
+--------+---------+-------+-------+--------------------+
| | | | | private |
+--------+---------+-------+-------+--------------------+
Windows metrics are extracted from
`PROCESS_MEMORY_COUNTERS_EX <http://msdn.microsoft.com/en-us/library/windows/desktop/ms684874(v=vs.85).aspx>`__ structure.
Example on Linux:
>>> import psutil
>>> p = psutil.Process()
>>> p.memory_info_ex()
pextmem(rss=15491072, vms=84025344, shared=5206016, text=2555904, lib=0, data=9891840, dirty=0)
.. method:: memory_percent()
Compare physical system memory to process resident memory (RSS) and
calculate process memory utilization as a percentage.
.. method:: memory_maps(grouped=True)
Return process's mapped memory regions as a list of namedtuples whose
fields are variable depending on the platform. As such, portable
applications should rely on namedtuple's `path` and `rss` fields only.
This method is useful to obtain a detailed representation of process
memory usage as explained
`here <http://bmaurer.blogspot.it/2006/03/memory-usage-with-smaps.html>`__.
If *grouped* is ``True`` the mapped regions with the same *path* are
grouped together and the different memory fields are summed. If *grouped*
is ``False`` every mapped region is shown as a single entity and the
namedtuple will also include the mapped region's address space (*addr*)
and permission set (*perms*).
See `examples/pmap.py <https://github.com/giampaolo/psutil/blob/master/examples/pmap.py>`__
for an example application.
>>> import psutil
>>> p = psutil.Process()
>>> p.memory_maps()
[pmmap_grouped(path='/lib/x8664-linux-gnu/libutil-2.15.so', rss=16384, anonymous=8192, swap=0),
pmmap_grouped(path='/lib/x8664-linux-gnu/libc-2.15.so', rss=6384, anonymous=15, swap=0),
pmmap_grouped(path='/lib/x8664-linux-gnu/libcrypto.so.0.1', 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),
...]
>>>
.. method:: children(recursive=False)
Return the children of this process as a list of :Class:`Process` objects,
pre-emptively checking whether PID has been reused. If recursive is `True`
return all the parent descendants.
Example assuming *A == this process*:
::
A ─┐
│
├─ B (child) ─┐
│ └─ X (grandchild) ─┐
│ └─ Y (great grandchild)
├─ C (child)
└─ D (child)
>>> p.children()
B, C, D
>>> p.children(recursive=True)
B, X, Y, C, D
Note that in the example above if process X disappears process Y won't be
returned either as the reference to process A is lost.
.. method:: open_files()
Return regular files opened by process as a list of namedtuples including
the absolute file name and the file descriptor number (on Windows this is
always ``-1``). Example:
>>> import psutil
>>> f = open('file.ext', 'w')
>>> p = psutil.Process()
>>> p.open_files()
[popenfile(path='/home/giampaolo/svn/psutil/file.ext', fd=3)]
.. warning::
on Windows this is not fully reliable as due to some limitations of the
Windows API the underlying implementation may hang when retrieving
certain file handles.
In order to work around that psutil on Windows Vista (and higher) spawns
a thread and kills it if it's not responding after 100ms.
That implies that on Windows this method is not guaranteed to enumerate
all regular file handles (see full discusion
`here <https://github.com/giampaolo/psutil/pull/597>`_).
.. warning::
on FreeBSD this method can return files with a 'null' path (see
`issue 595 <https://github.com/giampaolo/psutil/pull/595>`_).
.. versionchanged:: 3.1.0 no longer hangs on Windows.
.. method:: connections(kind="inet")
Return socket connections opened by process as a list of namedtuples.
To get system-wide connections use :func:`psutil.net_connections()`.
Every namedtuple provides 6 attributes:
- **fd**: the socket file descriptor. This can be passed to
`socket.fromfd() <http://docs.python.org/library/socket.html#socket.fromfd>`__
to obtain a usable socket object.
This is only available on UNIX; on Windows ``-1`` is always returned.
- **family**: the address family, either `AF_INET
<http://docs.python.org//library/socket.html#socket.AF_INET>`__,
`AF_INET6 <http://docs.python.org//library/socket.html#socket.AF_INET6>`__
or `AF_UNIX <http://docs.python.org//library/socket.html#socket.AF_UNIX>`__.
- **type**: the address type, either `SOCK_STREAM
<http://docs.python.org//library/socket.html#socket.SOCK_STREAM>`__ or
`SOCK_DGRAM
<http://docs.python.org//library/socket.html#socket.SOCK_DGRAM>`__.
- **laddr**: the local address as a ``(ip, port)`` tuple or a ``path``
in case of AF_UNIX sockets.
- **raddr**: the remote address as a ``(ip, port)`` tuple or an absolute
``path`` in case of UNIX sockets.
When the remote endpoint is not connected you'll get an empty tuple
(AF_INET) or ``None`` (AF_UNIX).
On Linux AF_UNIX sockets will always have this set to ``None``.
- **status**: represents the status of a TCP connection. The return value
is one of the :data:`psutil.CONN_* <psutil.CONN_ESTABLISHED>` constants.
For UDP and UNIX sockets this is always going to be
:const:`psutil.CONN_NONE`.
The *kind* parameter is a string which filters for connections that fit the
following criteria:
.. table::
+----------------+-----------------------------------------------------+
| **Kind value** | **Connections using** |
+================+=====================================================+
| "inet" | IPv4 and IPv6 |
+----------------+-----------------------------------------------------+
| "inet4" | IPv4 |
+----------------+-----------------------------------------------------+
| "inet6" | IPv6 |
+----------------+-----------------------------------------------------+
| "tcp" | TCP |
+----------------+-----------------------------------------------------+
| "tcp4" | TCP over IPv4 |
+----------------+-----------------------------------------------------+
| "tcp6" | TCP over IPv6 |
+----------------+-----------------------------------------------------+
| "udp" | UDP |
+----------------+-----------------------------------------------------+
| "udp4" | UDP over IPv4 |
+----------------+-----------------------------------------------------+
| "udp6" | UDP over IPv6 |
+----------------+-----------------------------------------------------+
| "unix" | UNIX socket (both UDP and TCP protocols) |
+----------------+-----------------------------------------------------+
| "all" | the sum of all the possible families and protocols |
+----------------+-----------------------------------------------------+
Example:
>>> import psutil
>>> p = psutil.Process(1694)
>>> p.name()
'firefox'
>>> p.connections()
[pconn(fd=115, family=<AddressFamily.AF_INET: 2>, type=<SocketType.SOCK_STREAM: 1>, laddr=('10.0.0.1', 48776), raddr=('93.186.135.91', 80), status='ESTABLISHED'),
pconn(fd=117, family=<AddressFamily.AF_INET: 2>, type=<SocketType.SOCK_STREAM: 1>, laddr=('10.0.0.1', 43761), raddr=('72.14.234.100', 80), status='CLOSING'),
pconn(fd=119, family=<AddressFamily.AF_INET: 2>, type=<SocketType.SOCK_STREAM: 1>, laddr=('10.0.0.1', 60759), raddr=('72.14.234.104', 80), status='ESTABLISHED'),
pconn(fd=123, family=<AddressFamily.AF_INET: 2>, type=<SocketType.SOCK_STREAM: 1>, laddr=('10.0.0.1', 51314), raddr=('72.14.234.83', 443), status='SYN_SENT')]
.. method:: is_running()
Return whether the current process is running in the current process list.
This is reliable also in case the process is gone and its PID reused by
another process, therefore it must be preferred over doing
``psutil.pid_exists(p.pid)``.
.. note::
this will return ``True`` also if the process is a zombie
(``p.status() == psutil.STATUS_ZOMBIE``).
.. method:: send_signal(signal)
Send a signal to process (see
`signal module <http://docs.python.org//library/signal.html>`__
constants) pre-emptively checking whether PID has been reused.
This is the same as ``os.kill(pid, sig)``.
On Windows only **SIGTERM** is valid and is treated as an alias for
:meth:`kill()`.
.. method:: suspend()
Suspend process execution with **SIGSTOP** signal pre-emptively checking
whether PID has been reused.
On UNIX this is the same as ``os.kill(pid, signal.SIGSTOP)``.
On Windows this is done by suspending all process threads execution.
.. method:: resume()
Resume process execution with **SIGCONT** signal pre-emptively checking
whether PID has been reused.
On UNIX this is the same as ``os.kill(pid, signal.SIGCONT)``.
On Windows this is done by resuming all process threads execution.
.. method:: terminate()
Terminate the process with **SIGTERM** signal pre-emptively checking
whether PID has been reused.
On UNIX this is the same as ``os.kill(pid, signal.SIGTERM)``.
On Windows this is an alias for :meth:`kill`.
.. method:: kill()
Kill the current process by using **SIGKILL** signal pre-emptively
checking whether PID has been reused.
On UNIX this is the same as ``os.kill(pid, signal.SIGKILL)``.
On Windows this is done by using
`TerminateProcess <http://msdn.microsoft.com/en-us/library/windows/desktop/ms686714(v=vs.85).aspx>`__.
.. method:: wait(timeout=None)
Wait for process termination and if the process is a children of the
current one also return the exit code, else ``None``. On Windows there's
no such limitation (exit code is always returned). If the process is
already terminated immediately return ``None`` instead of raising
:class:`NoSuchProcess`. If *timeout* is specified and process is still
alive raise :class:`TimeoutExpired` exception. It can also be used in a
non-blocking fashion by specifying ``timeout=0`` in which case it will
either return immediately or raise :class:`TimeoutExpired`.
To wait for multiple processes use :func:`psutil.wait_procs()`.
Popen class
-----------
.. class:: Popen(*args, **kwargs)
A more convenient interface to stdlib
`subprocess.Popen <http://docs.python.org/library/subprocess.html#subprocess.Popen>`__.
It starts a sub process and deals with it exactly as when using
`subprocess.Popen <http://docs.python.org/library/subprocess.html#subprocess.Popen>`__
but in addition it also provides all the methods of
:class:`psutil.Process` class in a single interface.
For method names common to both classes such as
:meth:`send_signal() <psutil.Process.send_signal()>`,
:meth:`terminate() <psutil.Process.terminate()>` and
:meth:`kill() <psutil.Process.kill()>`
:class:`psutil.Process` implementation takes precedence.
For a complete documentation refer to
`subprocess module documentation <http://docs.python.org/library/subprocess.html>`__.
.. note::
Unlike `subprocess.Popen <http://docs.python.org/library/subprocess.html#subprocess.Popen>`__
this class pre-emptively checks wheter PID has been reused on
:meth:`send_signal() <psutil.Process.send_signal()>`,
:meth:`terminate() <psutil.Process.terminate()>` and
:meth:`kill() <psutil.Process.kill()>`
so that you can't accidentally terminate another process, fixing
http://bugs.python.org/issue6973.
>>> import psutil
>>> from subprocess import PIPE
>>>
>>> p = psutil.Popen(["/usr/bin/python", "-c", "print('hello')"], stdout=PIPE)
>>> p.name()
'python'
>>> p.username()
'giampaolo'
>>> p.communicate()
('hello\n', None)
>>> p.wait(timeout=2)
0
>>>
Constants
=========
.. _const-pstatus:
.. data:: STATUS_RUNNING
STATUS_SLEEPING
STATUS_DISK_SLEEP
STATUS_STOPPED
STATUS_TRACING_STOP
STATUS_ZOMBIE
STATUS_DEAD
STATUS_WAKE_KILL
STATUS_WAKING
STATUS_IDLE
STATUS_LOCKED
STATUS_WAITING
A set of strings representing the status of a process.
Returned by :meth:`psutil.Process.status()`.
.. _const-conn:
.. data:: CONN_ESTABLISHED
CONN_SYN_SENT
CONN_SYN_RECV
CONN_FIN_WAIT1
CONN_FIN_WAIT2
CONN_TIME_WAIT
CONN_CLOSE
CONN_CLOSE_WAIT
CONN_LAST_ACK
CONN_LISTEN
CONN_CLOSING
CONN_NONE
CONN_DELETE_TCB (Windows)
CONN_IDLE (Solaris)
CONN_BOUND (Solaris)
A set of strings representing the status of a TCP connection.
Returned by :meth:`psutil.Process.connections()` (`status` field).
.. _const-prio:
.. data:: ABOVE_NORMAL_PRIORITY_CLASS
BELOW_NORMAL_PRIORITY_CLASS
HIGH_PRIORITY_CLASS
IDLE_PRIORITY_CLASS
NORMAL_PRIORITY_CLASS
REALTIME_PRIORITY_CLASS
A set of integers representing the priority of a process on Windows (see
`MSDN documentation <http://msdn.microsoft.com/en-us/library/ms686219(v=vs.85).aspx>`__).
They can be used in conjunction with
:meth:`psutil.Process.nice()` to get or set process priority.
Availability: Windows
.. versionchanged:: 3.0.0 on Python >= 3.4 these constants are
`enums <https://docs.python.org/3/library/enum.html#module-enum>`__
instead of a plain integer.
.. _const-ioprio:
.. data:: IOPRIO_CLASS_NONE
IOPRIO_CLASS_RT
IOPRIO_CLASS_BE
IOPRIO_CLASS_IDLE
A set of integers representing the I/O priority of a process on Linux. They
can be used in conjunction with :meth:`psutil.Process.ionice()` to get or set
process I/O priority.
*IOPRIO_CLASS_NONE* and *IOPRIO_CLASS_BE* (best effort) is the default for
any process that hasn't set a specific I/O priority.
*IOPRIO_CLASS_RT* (real time) means the process is given first access to the
disk, regardless of what else is going on in the system.
*IOPRIO_CLASS_IDLE* means the process will get I/O time when no-one else
needs the disk.
For further information refer to manuals of
`ionice <http://linux.die.net/man/1/ionice>`__
command line utility or
`ioprio_get <http://linux.die.net/man/2/ioprio_get>`__
system call.
Availability: Linux
.. versionchanged:: 3.0.0 on Python >= 3.4 thse constants are
`enums <https://docs.python.org/3/library/enum.html#module-enum>`__
instead of a plain integer.
.. _const-rlimit:
.. data:: RLIMIT_INFINITY
RLIMIT_AS
RLIMIT_CORE
RLIMIT_CPU
RLIMIT_DATA
RLIMIT_FSIZE
RLIMIT_LOCKS
RLIMIT_MEMLOCK
RLIMIT_MSGQUEUE
RLIMIT_NICE
RLIMIT_NOFILE
RLIMIT_NPROC
RLIMIT_RSS
RLIMIT_RTPRIO
RLIMIT_RTTIME
RLIMIT_RTPRIO
RLIMIT_SIGPENDING
RLIMIT_STACK
Constants used for getting and setting process resource limits to be used in
conjunction with :meth:`psutil.Process.rlimit()`. See
`man prlimit <http://linux.die.net/man/2/prlimit>`__ for futher information.
Availability: Linux
.. _const-aflink:
.. data:: AF_LINK
Constant which identifies a MAC address associated with a network interface.
To be used in conjunction with :func:`psutil.net_if_addrs()`.
*New in 3.0.0*
.. _const-duplex:
.. data:: NIC_DUPLEX_FULL
NIC_DUPLEX_HALF
NIC_DUPLEX_UNKNOWN
Constants which identifies whether a NIC (network interface card) has full or
half mode speed. NIC_DUPLEX_FULL means the NIC is able to send and receive
data (files) simultaneously, NIC_DUPLEX_FULL means the NIC can either send or
receive data at a time.
To be used in conjunction with :func:`psutil.net_if_stats()`.
*New in 3.0.0*
Development guide
=================
If you plan on hacking on psutil (e.g. want to add a new feature or fix a bug)
take a look at the
`development guide <https://github.com/giampaolo/psutil/blob/master/DEVGUIDE.rst>`_.
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