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the PID of the process being queried has been reused over time.
That means you might end up retrieving an information referring
to another process in case the original one this instance
refers to is gone in the meantime.
The only exceptions for which process identity is pre-emptively
checked and guaranteed are:
- parent()
- children()
- nice() (set)
- ionice() (set)
- rlimit() (set)
- cpu_affinity (set)
- suspend()
- resume()
- send_signal()
- terminate()
- kill()
To prevent this problem for all other methods you can:
- use is_running() before querying the process
- if you're continuously iterating over a set of Process
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Nc C s | j |� d S )N)�_init)rq rm r r r rl ' s zProcess.__init__Fc C s� |d krt j� }n6t r4t|ttf� r4td| ��|dk rHtd| ��|| _d | _ d | _
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�r4 |�r.� wFY nX | ||< qFW |S )a� Utility method returning process information as a
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only) attributes are assumed.
'ad_value' is the value which gets assigned in case
AccessDenied exception is raised when retrieving that
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zProcess.as_dictc C sJ | j � }|dk rFy t|�}|j� | j� kr.|S W n tk
rD Y nX dS )z�Return the parent process as a Process object pre-emptively
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N)�ppidr' r� r )rq r� r� r r r r� � s zProcess.parentc C s8 | j r
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r2 d| _ dS X dS )z�Return whether this process is running.
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FTN)r� r' rm r )rq r r r rv � s zProcess.is_runningc C s | j S )zThe process PID.)r� )rq r r r rm � s z Process.pidc C s. t r| jj� S | jdkr$| jj� | _| jS dS )z`The process parent PID.
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N)�_POSIXr� r� r� )rq r r r r� � s
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|�rh|}|| j_ || _ | j S )z>The process name. The return value is cached after first call.N� r ) rw r� rn r� �len�cmdliner r �path�basenamer� )rq rn r� Z
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rr Y nX |� _ � j S )z�The process executable as an absolute path.
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c sd � j � }|rRttd�rRttd�rR|d }tjj|�rRtjj|�rRtj|tj�rR|S t| t �r`| �| S )N�access�X_OKr )
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z Process.exe.<locals>.guess_itN� )r� )r� r� r� r �sys�exc_info)rq r� r� �errr )rq r r� � s
z Process.exec C s
| j j� S )z3The command line this process has been called with.)r� r� )rq r r r r� % s zProcess.cmdlinec C s
| j j� S )z2The process current status as a STATUS_* constant.)r� �status)rq r r r r� ) s zProcess.statusc C s4 t r&tdkrtd��tj| j� j�jS | jj� S dS )ztThe name of the user that owns the process.
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Nz0requires pwd module shipped with standard python) r� �pwd� ImportError�getpwuid�uids�realZpw_namer� �username)rq r r r r� - s zProcess.usernamec C s | j dkr| jj� | _ | j S )z�The process creation time as a floating point number
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zProcess.create_timec C s
| j j� S )z6Process current working directory as an absolute path.)r� r� )rq r r r r� C s z Process.cwdc C s8 |dkr| j j� S | j� s(t| j| j��| j j|� dS )z'Get or set process niceness (priority).N)r� Znice_getrv r rm rw Znice_set)rq �valuer r r �niceG s
z Process.nicec C s
| j j� S )zVReturn process UIDs as a (real, effective, saved)
namedtuple.
)r� r� )rq r r r r� R s z Process.uidsc C s
| j j� S )zVReturn process GIDs as a (real, effective, saved)
namedtuple.
)r� �gids)rq r r r r� X s z Process.gidsc C s
| j j� S )zVThe terminal associated with this process, if any,
else None.
)r� �terminal)rq r r r r� ^ s zProcess.terminalc C s
| j j� S )zcReturn the number of file descriptors opened by this
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)r� �num_fds)rq r r r r� d s zProcess.num_fds� io_countersc C s
| j j� S )a
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(read_count, write_count, read_bytes, write_bytes)
namedtuple.
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amount of bytes read and written by the process.
)r� r� )rq r r r r� m s zProcess.io_counters�
ionice_getc C s4 |dkr"|dk rt d��| jj� S | jj||�S dS )a� Get or set process I/O niceness (priority).
On Linux 'ioclass' is one of the IOPRIO_CLASS_* 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
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Available on Linux and Windows > Vista only.
Nz'ioclass' must be specified)r� r� r� Z
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zProcess.ionicer� c C s& |dkr| j j|�S | j j||�S dS )a" Get or set process resource limits as a (soft, hard)
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zProcess.rlimit�cpu_affinity_getc C s" |dkr| j j� S | j j|� dS )z�Get or set process CPU affinity.
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N)r� r� Zcpu_affinity_set)rq �cpusr r r � cpu_affinity� s
zProcess.cpu_affinityc C s
| j j� S )z\Return the number of handles opened by this process
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)r� � num_handles)rq r r r r� � s zProcess.num_handlesc C s
| j j� S )zkReturn the number of voluntary and involuntary context
switches performed by this process.
)r� �num_ctx_switches)rq r r r r� � s zProcess.num_ctx_switchesc C s
| j j� S )z2Return the number of threads used by this process.)r� � num_threads)rq r r r r� � s zProcess.num_threadsc C s
| j j� S )z�Return threads opened by process as a list of
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C s� t td�rtj� }nd}g }|s�|dkr|x�t� D ]F}y,|j� | jkr^| j� |j� kr^|j|� W q0 tk
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�r�|j|� |j| k�r�| j|j� �q�W �q�W |S )u& Return the children of this process as a list of Process
instances, pre-emptively checking whether PID has been reused.
If recursive is True return all the parent descendants.
Example (A == this process):
A ─┐
│
├─ B (child) ─┐
│ └─ X (grandchild) ─┐
│ └─ Y (great grandchild)
├─ C (child)
└─ D (child)
>>> import psutil
>>> p = psutil.Process()
>>> 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 listed as the reference to process A
is lost.
�ppid_mapN)
r� r� r� r+ r� rm r� �appendr �itemsr' r> �list) rq � recursiver� r� �prm r� Zchild�tableZ checkpidsZintimer r r r� � s\
zProcess.childrenc s |dk o|dk}t � � tr(� fdd�}ndd� }|r`|� }| jj� }tj|� |� }| jj� }n<| j}| j}|� }| jj� }|dks�|dkr�|| _|| _dS |j|j |j |j }|| } || _|| _y|| d � }
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r� dS X t |
d�S dS )a� Return a float representing the current process CPU
utilization as a percentage.
When interval is 0.0 or None (default) compares process times
to system CPU times elapsed since last call, returning
immediately (non-blocking). That means that the first time
this is called it will return a meaningful 0.0 value.
When interval is > 0.0 compares process times to system CPU
times elapsed before and after the interval (blocking).
In this case is recommended for accuracy that this function
be called with at least 0.1 seconds between calls.
Examples:
>>> import psutil
>>> p = psutil.Process(os.getpid())
>>> # blocking
>>> p.cpu_percent(interval=1)
2.0
>>> # non-blocking (percentage since last call)
>>> p.cpu_percent(interval=None)
2.9
>>>
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t � � S )N)�_timerr )�num_cpusr r �<lambda>B s z%Process.cpu_percent.<locals>.<lambda>c S s
t t� �S )N)�sumr/ r r r r r� D s �d r� ) r2 r� r� r/ �time�sleepr� r� �user�system�ZeroDivisionError�round) rq �interval�blockingZtimerZst1Zpt1Zst2Zpt2Z
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| j j� S )z�Return a (user, system) namedtuple representing the
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)r� r/ )rq r r r r/ i s zProcess.cpu_timesc C s
| j j� S )a 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.
)r� � memory_info)rq r r r r� p s zProcess.memory_infoc C s
| j j� S )z�Return a namedtuple with variable fields depending on the
platform representing extended memory information about
this process. All numbers are expressed in bytes.
)r� �memory_info_ex)rq r r r r� { s zProcess.memory_info_exc C sD | j j� d }tpt� j}y|t|� d S tk
r> dS X dS )z�Compare physical system memory to process resident memory
(RSS) and calculate process memory utilization as a percentage.
r r� g N)r� r� �
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rh |� |< Y qX qW tj�� �fdd�� D �S tj��fdd�|D �S dS ) a� Return process' mapped memory regions as a list of nameduples
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entity and the namedtuple will also include the mapped region's
address space ('addr') and permission set ('perms').
r� � Nc S s | | S )Nr )r� �yr r r r� � s z%Process.memory_maps.<locals>.<lambda>c s g | ]}�|f� | �� �qS r r )r r� )�drf r r r � s z'Process.memory_maps.<locals>.<listcomp>c s g | ] }� |� �qS r r )r r� )rf r r r � s )r� � memory_maps�map�KeyErrorr� Z
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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
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rn tj� d }|jtjkrNd| _t | j| j
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Nr z"timeout must be a positive integer)r� r� r� )rq �timeoutr r r r� s z Process.waitr� )� replacementc C s d S )Nr )rq r r r � get_children s zProcess.get_childrenr c C s d S )Nr )rq r r r �get_connections$ s zProcess.get_connectionsr� c C s d S )Nr )rq r r r �get_cpu_affinity) s zProcess.get_cpu_affinityc C s d S )Nr )rq r� r r r �set_cpu_affinity- s zProcess.set_cpu_affinityr0 c C s d S )Nr )rq r r r �get_cpu_percent1 s zProcess.get_cpu_percentr/ c C s d S )Nr )rq r r r �
get_cpu_times5 s zProcess.get_cpu_timesr� c C s d S )Nr )rq r r r r� 9 s zProcess.getcwdr� c C s d S )Nr )rq r r r �get_ext_memory_info= s zProcess.get_ext_memory_infoc C s d S )Nr )rq r r r �get_io_countersB s zProcess.get_io_countersr� c C s d S )Nr )rq r r r �
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c C s d S )Nr )rq r r r �get_open_filesq s zProcess.get_open_filesc C s d S )Nr )rq r r r �
get_rlimitv s zProcess.get_rlimitc C s d S )Nr )rq r� r� r r r �
set_rlimitz s zProcess.set_rlimitr� c C s d S )Nr )rq r r r � get_threads~ s zProcess.get_threadsc C s d S )Nr )rq r� r r r �set_nice� s zProcess.set_nice)N)F)N)NN)N)N)F)N)T)r )N)N)Wrh ri rj rk rl r~ rs r� r� r� r� r� r� rv r; rm r� rn r� r� r� r� r� r� r� r� r� r� r� r� r� r� r' r� r� r� r� �_WINDOWSr� r� r� r� r} r� r0 r/ r� r� r r r
r r r� r� r� r� r� r� r� �localsZ_locals�_deprecated_methodr r r r r r r� r r r! r" r# r$ r% r& r' r( r) r* r+ r, r- r. r/ r r r r r' s�
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� Z� ZS ) r( at A more convenient interface to stdlib subprocess module.
It starts a sub process and deals with it exactly as when using
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properties and methods of psutil.Process class as a unified
interface:
>>> import psutil
>>> from subprocess import PIPE
>>> p = psutil.Popen(["python", "-c", "print 'hi'"], stdout=PIPE)
>>> p.name()
'python'
>>> p.uids()
user(real=1000, effective=1000, saved=1000)
>>> p.username()
'giampaolo'
>>> p.communicate()
('hi
', None)
>>> p.terminate()
>>> p.wait(timeout=2)
0
>>>
For method names common to both classes such as kill(), terminate()
and wait(), psutil.Process implementation takes precedence.
Unlike subprocess.Popen this class pre-emptively checks wheter PID
has been reused on send_signal(), terminate() and kill() so that
you don't accidentally terminate another process, fixing
http://bugs.python.org/issue6973.
For a complete documentation refer to:
http://docs.python.org/library/subprocess.html
c O s$ t j||�| _| j| jjdd� d S )NT)r� )�
subprocessr( �_Popen__subprocr~ rm )rq rx ry r r r rl � s zPopen.__init__c C s t ttt�ttj� ��S )N)�sortedr� r� r( r3 )rq r r r �__dir__� s z
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c C s t j� S )z&Return a list of current running PIDs.)r� r* r r r r r* � s c C s0 | dk r dS | dkr"t r"| t� kS tj| �S dS )z�Return True if given PID exists in the current process list.
This is faster than doing "pid in psutil.pids()" and
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r FN)r� r* r� r) )rm r r r r) � s
c c s� dd� } dd� }t t� �}t tj� �}|| }|| }x|D ] }||� q<W x�tttj� �ttj|�j� � �D ]p\}}y2|dkr�| |�V n|j � r�|V n
| |�V W qp t
k
r� ||� Y qp t k
r� |V Y qpX qpW dS )a� Return a generator yielding a Process instance for all
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safe in case a PID has been reused by another process, in which
case the cached instance is updated.
The sorting order in which processes are yielded is based on
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c S s t | �}|t|j< |S )N)r' �_pmaprm )rm �procr r r �add� s
zprocess_iter.<locals>.addc S s t j| d � d S )N)r= �pop)rm r r r �remove� s z process_iter.<locals>.removeN) r� r* r= �keysr5 r� r� r� �fromkeysrv r r )r? rA �a�bZnew_pidsZ gone_pidsrm r> r r r r+ � s(
c s � �fdd�}|dk r0|dk r0d| }t |��t� �t| �}� dk r\t� � r\tdt ��|dk rnt� | }xt|r�|dk r�|dkr�P xP|D ]H}dt|� }|dk r�t|t� |�}|dkr�P |||� q�|||� q�W |� }qpW |�r
x|D ]}||d� q�W |� }t��t|�fS )a� Convenience function which waits for a list of processes 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 (may be None).
'callback' is a function which gets called every time a process
terminates (a Process instance is passed as callback argument).
Function will return as soon as all processes terminate or when
timeout occurs.
Typical 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:
>>> def on_terminate(proc):
... print("process {} terminated".format(proc))
...
>>> for p in procs:
... p.terminate()
...
>>> gone, alive = wait_procs(procs, timeout=3, callback=on_terminate)
>>> for p in alive:
... p.kill()
c s\ y| j |d�}W n tk
r$ Y n4X |d k s8| j� rX|| _�j| � � d k rX� | � d S )N)r )r� r
rv r: r? )r> r r: )�callback�goner r �
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z wait_procs.<locals>.check_goneNr z*timeout must be a positive integer, got %sz callback %r is not a callableg �?)r� r� r< r� r� r� �minr� ) Zprocsr rF rH ro �aliveZdeadliner> Z max_timeoutr )rF rG r r, s6 "
Tc C s | r t j� S t j� S dS )as Return the number of logical CPUs in the system (same as
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If logical is False return the number of physical cores only
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The return value is cached after first call.
If desired cache can be cleared like this:
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N)r� Zcpu_count_logicalZcpu_count_physical)Zlogicalr r r r2 v s Fc C s | s t j� S t j� S dS )a� Return system-wide CPU times as a namedtuple.
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- 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 nameduples for each CPU.
First element of the list refers to first CPU, second element
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The order of the list is consistent across calls.
N)r� r/ Z
per_cpu_times)�percpur r r r/ � s )rK c C s� | dk o| dk}dd� }|sF|r2t � }tj| � nt}t � a||t�S g }|rdt dd�}tj| � nt}t dd�ax&t|t�D ]\}}|j|||�� q~W |S dS )a� 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 (non
blocking). That means the first time this is called it will
return a meaningless 0.0 value which you should 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.
Examples:
>>> # blocking, system-wide
>>> psutil.cpu_percent(interval=1)
2.0
>>>
>>> # blocking, per-cpu
>>> psutil.cpu_percent(interval=1, percpu=True)
[2.0, 1.0]
>>>
>>> # non-blocking (percentage since last call)
>>> psutil.cpu_percent(interval=None)
2.9
>>>
Ng c S sV t | �}|| j }t |�}||j }||kr0dS || }|| }|| d }t|d�S )Ng r� r� )r� Zidler� ) �t1�t2Zt1_allZt1_busyZt2_allZt2_busyZ
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c C s� | dk o| dk}dd� }|sF|r2t � }tj| � nt}t � a||t�S g }|rdt dd�}tj| � nt}t dd�ax&t|t�D ]\}}|j|||�� q~W |S dS )a� Same as cpu_percent() but provides utilization percentages
for each specific CPU time as is returned by cpu_times().
For instance, on Linux we'll get:
>>> cpu_times_percent()
cpupercent(user=4.8, nice=0.0, system=4.8, idle=90.5, iowait=0.0,
irq=0.0, softirq=0.0, steal=0.0, guest=0.0, guest_nice=0.0)
>>>
interval and percpu arguments have the same meaning as in
cpu_percent().
Ng c S s� g }t |�t | � }x~| jD ]t}t||�t| |� }yd| | }W n tk
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c C s t j� } | ja| S )a� Return statistics about system memory usage as a namedtuple
including the following fields, expressed in bytes:
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total physical memory available.
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the actual amount of available memory that can be given
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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:
OSX: active + inactive + wired
BSD: active + wired + cached
LINUX: total - free
- 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 (BSD, Linux):
cache for things like file system metadata.
- cached (BSD, OSX):
cache for various things.
- wired (OSX, BSD):
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.
)r� r- r� r� )r� r r r r- H s 6c C s t j� S )a� Return system swap memory statistics as a namedtuple including
the following fields:
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- used: used swap memory in bytes
- free: free swap memory in bytes
- percent: the percentage usage
- sin: no. of bytes the system has swapped in from disk (cumulative)
- sout: no. of bytes the system has swapped out from disk (cumulative)
'sin' and 'sout' on Windows are meaningless and always set to 0.
)r� r. r r r r r. � s
c C s
t j| �S )z�Return disk usage statistics about the given path as a namedtuple
including total, used and free space expressed in bytes plus the
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)r� r7 )r� r r r r7 � s c C s
t j| �S )a3 Return mounted partitions as a list of
(device, mountpoint, fstype, opts) namedtuple.
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options which may vary depending on the platform.
If "all" parameter is False return physical devices only and ignore
all others.
)r� r6 )�allr r r r6 � s c C s\ t j� }|std��| r>x |j� D ]\}}t|� ||< q"W |S tdd� t|j� � D �� S dS )a� Return system 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 namedutuple
described above as the values.
On recent Windows versions 'diskperf -y' command may need to be
executed first otherwise this function won't find any disk.
z couldn't find any physical diskc S s g | ] }t |��qS r )r� )r r� r r r r � s z$disk_io_counters.<locals>.<listcomp>N)r� r5 � RuntimeErrorr� �_nt_sys_diskiorR �values)Zperdisk�rawdictZdisk�fieldsr r r r5 � s c C s\ t j� }|std��| r>x |j� D ]\}}t|� ||< q"W |S tdd� t|j� � D �� S dS )a Return network I/O statistics as a namedtuple including
the following fields:
- 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.
z#couldn't find any network interfacec S s g | ] }t |��qS r )r� )r r� r r r r � s z#net_io_counters.<locals>.<listcomp>N)r� r3 rY r� �
_nt_sys_netiorR r[ )�pernicr\ Znicr] r r r r3 � s r c C s
t j| �S )a� Return system-wide connections as a list of
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In case of limited privileges 'fd' and 'pid' may be set to -1
and None respectively.
The 'kind' parameter filters for connections that fit the
following criteria:
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
)r� r4 )r
r r r r4 � s c C s t j� S )zvReturn the system boot time expressed in seconds since the epoch.
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)r� r9 r r r r r9 s c C s t j� S )a� 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.
- 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.
)r� r8 r r r r r8 s
z
psutil.pids())r c C s t � S )N)r* r r r r � get_pid_list# s r` zlist(process_iter())c C s
t t� �S )N)r� r+ r r r r �get_process_list( s ra zpsutil.users()c C s t � S )N)r8 r r r r � get_users- s rb zpsutil.virtual_memory()c C s t � S )z�Return the amount of total, used and free physical memory
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)r- r r r r � phymem_usage2 s rc zpsutil.swap_memory()c C s t � S )N)r. r r r r �
virtmem_usage; s rd zpsutil.phymem_usage().freec C s t � jS )N)rc �freer r r r � avail_phymem@ s rf zpsutil.phymem_usage().usedc C s t � jS )N)rc �usedr r r r � used_phymemE s rh z psutil.virtmem_usage().totalc C s t � jS )N)rd r� r r r r �
total_virtmemJ s ri zpsutil.virtmem_usage().usedc C s t � jS )N)rd rg r r r r � used_virtmemO s rj zpsutil.virtmem_usage().freec C s t � jS )N)rd re r r r r �
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