third_party/psutil/docs/documentation.html - Issue 8159001: Update third_party/psutil and fix the licence issue with it.

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Issue 8159001: Update third_party/psutil and fix the licence issue with it. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src

Patch Set: remove the suppression and unnecessary files. Created 9 years, 2 months ago

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14 <tr>	21 <h1><a name="API_Reference"></a>API Reference<a href="http://code.google.com/p/ psutil/wiki/DocumentationDev?show=content#API_Reference" class="section_anchor"> </a></h1><h2><a name="Exceptions"></a>Exceptions<a href="http://code.google.com/ p/psutil/wiki/DocumentationDev?show=content#Exceptions" class="section_anchor">< /a></h2><p>psutil.<strong>NoSuchProcess</strong><font size="3"><strong><tt>(</tt ></strong></font><i>pid, name=None, msg=None</i><font size="3"><strong><tt>)</tt ></strong></font> </p><blockquote>Raised when no process with the given PID is f ound in the current process list or when a process no longer exists (zombie).

15	22 </blockquote><p></p><p>psutil.<strong>AccessDenied</strong><font size="3"><stron g><tt>(</tt></strong></font><i>pid=None, name=None, msg=None</i><font size="3">< strong><tt>)</tt></strong></font> </p><blockquote>Raised when permission to perf orm an action is denied.

16 <td class="vt" id="wikimaincol" width="100%">	23 </blockquote><p></p><p>psutil.<strong>TimeoutExpired</strong><font size="3"><str ong><tt>(</tt></strong></font><i>pid=None, name=None</i><font size="3"><strong>< tt>)</tt></strong></font> </p><blockquote>Raised on <tt>Process.wait(timeout)</t t> if timeout expires and process is still alive.

17	24 </blockquote><p></p><blockquote><i><strong>New in 0.2.1</strong></i>

18 <div id="wikiheader" style="margin-bottom:1em">	25 </blockquote><hr><h2><a name="Classes"></a>Classes<a href="http://code.google.co m/p/psutil/wiki/DocumentationDev?show=content#Classes" class="section_anchor"></ a></h2><p>psutil.<strong>Process</strong><font size="3"><strong><tt>(</tt></stro ng></font><i>pid</i><font size="3"><strong><tt>)</tt></strong></font> </p><block quote>A class which represents an OS process.

19	26 </blockquote><ul><li><strong>pid</strong><br>The process pid. </li></ul><ul><li> <strong>ppid</strong><br>The process parent pid. </li></ul><ul><li><strong>paren t</strong><br>Return the parent process as a <tt>Process</tt> object. If no ppid is known then return <tt>None</tt>. </li></ul><ul><li><strong>name</strong><br> The process name. </li></ul><ul><li><strong>exe</strong><br>The process executab le as an absolute path name. </li></ul><ul><li><strong>cmdline</strong><br>The c ommand line process has been called with. </li></ul><ul><li><strong>create_time< /strong><br> The process creation time as a floating point number expressed in s econds since the epoch, in <a href="http://en.wikipedia.org/wiki/Coordinated_Uni versal_Time" rel="nofollow">UTC</a>. </li><pre class="prettyprint">>>> import os, psutil, datetime

20 </div>	27 >>> p = psutil.Process(os.getpid())

21 <h1><a name="API_Reference"></a>API Reference<a href="#API_Reference" class="se ction_anchor"></a></h1><h2><a name="Exceptions"></a>Exceptions<a href="#Exceptio ns" class="section_anchor"></a></h2><p>psutil.<strong>NoSuchProcess</strong><fon t size="3"><strong><tt>(</tt></strong></font><i>pid, name=None, msg=None</i><fon t size="3"><strong><tt>)</tt></strong></font> <blockquote>Raised when no process with the given PID was found in the current process list or when a process no l onger exists (zombie).	28 >>> p.create_time

22 </blockquote></p><blockquote><i>Changed in 0.2.0: <tt>pid</tt>, <tt>name</tt> an d <tt>msg</tt> arguments were added </i>	29 1307289803.47

23 </blockquote><p>psutil.<strong>AccessDenied</a></strong><font size="3"><strong>< tt>(</tt></strong></font><i>pid=None, name=None, msg=None</i><font size="3"><str ong><tt>)</tt></strong></font> <blockquote>Raised when permission to perform an action is denied.	30 >>> datetime.datetime.fromtimestamp(p.create_time).strftime("%Y-%M-%d % H:%M")

24 </blockquote></p><blockquote><i>Changed in 0.2.0: <tt>pid</tt>, <tt>name</tt> an d <tt>msg</tt> arguments were added </i>	31 '2011-03-05 18:03'</pre></ul><ul><li><strong>uids</strong><br>The <i>real</i>, < i>effective</i> and <i>saved</i> user ids of the current process as a nameduple. This is the same as <a href="http://docs.python.org/library/os.html#os.getresui d" rel="nofollow">os.getresuid()</a> but per-process. </li></ul><blockquote><i>< strong>New in 0.2.1</strong></i><br><strong><i>Availability:</i></strong><i> UNI X</i>

25 </blockquote><hr/><h2><a name="Classes"></a>Classes<a href="#Classes" class="sec tion_anchor"></a></h2><p>psutil.<strong>Process</strong><font size="3"><strong>< tt>(</tt></strong></font><i>pid</i><font size="3"><strong><tt>)</tt></strong></f ont> </p><blockquote>A class which represents an OS process.	32 </blockquote><ul><li><strong>gids</strong><br>The <i>real</i>, <i>effective</i> and <i>saved</i> group ids of the current process as a nameduple. This is the sa me as <a href="http://docs.python.org/library/os.html#os.getresgid" rel="nofollo w">os.getresgid()</a> but per-process. </li></ul><blockquote><i><strong>New in 0 .2.1</strong></i><br><i><strong>Availability:</strong> UNIX</i>

26 </blockquote><ul><li><strong>pid</strong><br>The process pid. </li></ul><ul><li> <strong>ppid</strong><br>The process parent pid. </li></ul><ul><li><strong>paren t</strong><br>Return the parent process as a <tt>Process</tt> object. If no ppid is known then return <tt>None</tt>. </li></ul><ul><li><strong>name</strong><br> The process name. </li></ul><ul><li><strong>exe</strong><br>The process executab le as an absolute path name. </li></ul><blockquote><i>New in 0.2.0</i>	33 </blockquote><ul><li><strong>username</strong><br>The name of the user that owns the process. On UNIX this is calculated by using <i>real</i> process uid. </li> </ul><blockquote><i><strong>Changed in 2.0:</strong> Windows implementation has been rewritten in C for performace and <a href="http://sourceforge.net/projects/ pywin32/" rel="nofollow">pywin32</a> extension is no longer required.</i>

27 </blockquote><ul><li><strong>cmdline</strong><br>The command line process has be en called with. </li></ul><ul><li><strong>path</strong><br>The process path. </ li></ul><blockquote><i>Deprecated in 0.2.0</i>	34 </blockquote><ul><li><strong>terminal</strong><br>The terminal associated with t his process, if any, else None. This is similar to "tty" command but per-process . </li></ul><blockquote><i><strong>New in 0.3.0</strong></i><br><i><strong>Avail ability:</strong> UNIX</i>

28 </blockquote><ul><li><strong>create_time</strong><br> The process creation time as a floating point number expressed in seconds since the epoch, in <a href="htt p://en.wikipedia.org/wiki/Coordinated_Universal_Time" rel="nofollow">UTC</a>. </ li></ul><ul><li><strong>uid</strong><br>The real user id of the current process. Where uid doesn't make sense (<i>Windows</i>) always return <tt>-1</tt>. </li></ul><ul><li><strong>gid</strong><br>The real group id of the current proce ss. Where gid doesn't make sense (<i>Windows</i>) always return <tt>-1</tt >. </li></ul><ul><li><strong>username</strong><br>The name of the user that owns the process. </li></ul><blockquote><i>Changed in 2.0: Windows implementation ha s been rewritten in C for performace and <a href="http://sourceforge.net/project s/pywin32/" rel="nofollow">pywin32</a> extension is no longer required.</i>	35 </blockquote><ul><li><strong>status</strong><br>The current process status. The return value is one of the <tt>STATUS_*</tt> constants, which is an integer that can be used in conjunction with str() to obtain a human-readable form of the cu rrent process status. Example: </li><pre class="prettyprint">>>> import psutil, os

29 </blockquote><ul><li><strong>getcwd</strong><font size="3"><strong><tt>()</tt></ strong></font><br>Return a string representing the process current working direc tory. </li></ul><ul><li><strong>get_num_threads</strong><font size="3"><strong>< tt>()</tt></strong></font><br>Return the number of threads used by this process. </li></ul><blockquote><i>New in 0.2.0</i>	36 >>> p = psutil.Process(os.getpid())

30 </blockquote><ul><li><strong>get_cpu_times</strong><font size="3"><strong><tt>() </tt></strong></font><br>Return a tuple whose values are process CPU user and sy stem times which means the amount of time expressed in seconds that a process ha s spent in <a href="http://stackoverflow.com/questions/556405/what-do-real-user- and-sys-mean-in-the-output-of-time1" rel="nofollow">user/system mode</a>. </li>< /ul><ul><li><strong>cpu_percent</strong><font size="3"><strong><tt>(</tt></stron g></font><i>interval=0.1</i><font size="3"><strong><tt>)</tt></strong></font><br >Return a float representing the process CPU utilization as a percentage. When i nterval is > 0.0 compares process times to system CPU times elapsed before an d after the interval (blocking). When interval is 0.0 or None compares process t imes to system CPU times elapsed since last call, returning immediately. In this case is recommended for accuracy that this function be called with at least 0.1 seconds between calls. </li></ul><blockquote><i>Changed in 0.2.0: interval para meter was added</i>	37 >>> p.status

31 </blockquote><ul><li><strong>get_memory_info</strong><font size="3"><strong><tt> ()</tt></strong></font><br>Return a tuple representing <a href="http://en.wikipe dia.org/wiki/Resident_Set_Size" rel="nofollow">RSS</a> (Resident Set Size) and V MS (Virtual Memory Size) in bytes.<br>On UNIX RSS and VMS are the same values sh own by ps. On Windows RSS and VMS refer to "Mem Usage" and "VM Si ze" columns of taskmgr.exe. </li></ul><ul><li><strong>get_memory_percent</s trong><font size="3"><strong><tt>()</tt></strong></font><br>Compare physical sys tem memory to process resident memory and calculate process memory utilization a s a percentage. </li></ul><ul><li><strong>get_children</strong><font size="3"><s trong><tt>()</tt></strong></font><br>Return the children of this process as a li st of <tt>Process</tt> objects. </li></ul><blockquote><i>New in 0.2.0</i>	38 0

32 </blockquote><ul><li><strong>get_open_files</strong><font size="3"><strong><tt>( )</tt></strong></font><br>Return files opened by process as a list of <a href="h ttp://docs.python.org/library/collections.html?highlight=namedtuple#collections. namedtuple" rel="nofollow">namedtuples</a> including file absolute path name and file descriptor. On <strong>OSX</strong> and <strong>FreeBSD</strong> this is d one by parsing <a href="http://en.wikipedia.org/wiki/Lsof" rel="nofollow">lsof</ a> command output. If lsof is not installed on the system <a href="http://docs.p ython.org/library/exceptions.html?highlight=notimplementederror#exceptions.NotIm plementedError" rel="nofollow">NotImplementedError</a> exception is raised. Exa mple: </li><pre class="prettyprint">>>> import psutil, os	39 >>> p.status == psutil.STATUS_RUNNING

33 >>> f = open('file.ext', 'w')	40 True

34 >>> psutil.Process(os.getpid()).get_open_files()	41 >>> str(p.status)

35 [openfile(path='/home/giampaolo/svn/psutil/file.ext', fd=3)]</pre></ul ><blockquote><i>New in 0.2.0</i>	42 'running'

36 </blockquote><ul><li><strong>get_connections</strong><font size="3"><strong><tt> ()</tt></strong></font><br>Return all TCP and UPD connections opened by process as a list of <a href="http://docs.python.org/library/collections.html?highlight= namedtuple#collections.namedtuple" rel="nofollow">namedtuples</a>. Every namedtu ple provides 6 attributes:<br></br> </li><ul><li><strong>fd</strong>: the socket file descriptor. This can be passed to <a href="http://docs.python.org/library/ socket.html#socket.fromfd" rel="nofollow">socket.fromfd</a> to obtain a usable s ocket object. This is only available on UNIX; on Windows <tt>-1</tt> is always r eturned.<br> </li><li><strong>family</strong>: the address family, either <a hre f="http://docs.python.org/library/socket.html#socket.AF_INET" rel="nofollow">AF_ INET</a> or <a href="http://docs.python.org/library/socket.html#socket.AF_INET6" rel="nofollow">AF_INET6</a> <br> </li><li><strong>type</strong>: the address ty pe, either <a href="http://docs.python.org/library/socket.html#socket.SOCK_STREA M" rel="nofollow">SOCK_STREAM</a> or <a href="http://docs.python.org/library/soc ket.html#socket.SOCK_DGRAM" rel="nofollow">SOCK_DGRAM</a> <br> </li><li><strong> local_address</strong>: the local address as a <tt>(ip, port)</tt> tuple. <br> < /li><li><strong>remote_address</strong>: the remote address as a <tt>(ip, port)< /tt> tuple. When the remote endpoint is not connected the tuple is empty. <br> < /li><li><strong>status</strong>: a string representing the TCP connections statu s. String values are supposed to match Linux's <a href="http://students.mim uw.edu.pl/lxr/source/include/net/tcp_states.h" rel="nofollow">tcp_states.h</a> h eader file across all platforms. For UDP sockets this is always going to be an e mpty string.<br> </li></ul></ul><blockquote>Example:	43 >>></pre></ul><blockquote><i><strong>New in 2.1</strong></i>

	44 </blockquote><ul><li><strong>nice</strong><br>Get or set process <a href="http:/ /blogs.techrepublic.com.com/opensource/?p=140" rel="nofollow">niceness</a> (prio rity). On UNIX this is a number which usually goes from -20 to 20. The higher th e nice value, the lower the priority of the process. </li><pre class="prettyprin t">>>> p = psutil.Process(os.getpid())

	45 >>> p.nice

	46 0

	47 >>> p.nice = 10 # set/change process priority

	48 >>> p.nice

	49 10</pre></ul><blockquote>On Windows this is available as well by using <a href=" http://msdn.microsoft.com/en-us/library/ms683211(v=vs.85).aspx" rel="nofollow">G etPriorityClass</a> and <a href="http://msdn.microsoft.com/en-us/library/ms68621 9(v=vs.85).aspx" rel="nofollow">SetPriorityClass</a>. <tt>psutil.*_PRIORITY_CLAS S</tt> constants (explained <a href="http://msdn.microsoft.com/en-us/library/ms6 86219(v=vs.85).aspx" rel="nofollow">here</a>) can be used in conjunction. Exampl e which increases process priority:

	50 </blockquote><blockquote><pre class="prettyprint">>> p.nice = psutil.HIGH_ PRIORITY_CLASS</pre>

	51 </blockquote><blockquote><i><strong>New in 2.1</strong></i>

	52 </blockquote><ul><li><strong>getcwd</strong><font size="3"><strong><tt>()</tt></ strong></font><br>Return a string representing the process current working direc tory. </li></ul><blockquote><i><strong>Availability:</strong> Windows, Linux</i>

	53 </blockquote><ul><li><strong>get_io_counters</strong><font size="3"><strong><tt> ()</tt></strong></font><br>Return process I/O statistics as a namedtuple includi ng the number of read and write operations performed by the process and the amou nt of bytes read and written. For linux refer to <a href="http://www.mjmwired.ne t/kernel/Documentation/filesystems/proc.txt#1304" rel="nofollow">/proc filesysem documentation</a>. On BSD there's apparently no way to retrieve bytes counters, hence <tt>-1</tt> is returned for <tt>read_bytes</tt> and <tt>write_bytes</tt> fields. OSX is not supported. </li><pre class="prettyprint">>>> p.get_i o_counters()

	54 io(read_count=454556, write_count=3456, read_bytes=110592, write_bytes=0)</pre>< /ul><blockquote><i><strong>New in 2.1</strong></i><br><i><strong>Availability:</ strong> Linux, Windows, FreeBSD</i>

	55 </blockquote><ul><li><strong>get_ionice</strong><font size="3"><strong><tt>()</t t></strong></font><br>Return <a href="http://friedcpu.wordpress.com/2007/07/17/w hy-arent-you-using-ionice-yet/" rel="nofollow">process I/O niceness</a> (priorit y) as a namedtuple including priority class and priority data. See <tt>set_ionic e</tt> below for more information. </li></ul><blockquote><i><strong>New in 2.1</ strong></i><br><i><strong>Availability:</strong> Linux</i>

	56 </blockquote><ul><li><strong>set_ionice</strong><font size="3"><strong><tt>(</tt ></strong></font><i>ioclass, value=None</i><font size="3"><strong><tt>)</tt></st rong></font><br>Change <a href="http://friedcpu.wordpress.com/2007/07/17/why-are nt-you-using-ionice-yet/" rel="nofollow">process I/O niceness</a> (priority). <i >ioclass</i> is one of the <strong><tt>IOPRIO_CLASS_*</tt></strong> constants. < i>value</i> is a number which goes from 0 to 7. The higher <i>value</i> value, t he lower the I/O priority of the process. For further information refer to <a hr ef="http://linux.die.net/man/1/ionice" rel="nofollow">ionice</a> command line ut ility or <a href="http://linux.die.net/man/2/ioprio_set" rel="nofollow">ioprio_s et</a> system call. The example below sets IDLE priority class for the current p rocess, meaning it will only get I/O time when no other process needs the disk: </li><pre class="prettyprint">>>> import psutil, os

	57 >>> p = psutil.Process(os.getpid())

	58 >>> p.set_ionice(psutil.IOPRIO_CLASS_IDLE)

	59 >>></pre></ul><blockquote><i><strong>New in 2.1</strong></i><br><i><str ong>Availability:</strong> Linux</i>

	60 </blockquote><ul><li><strong>get_num_threads</strong><font size="3"><strong><tt> ()</tt></strong></font><br>Return the number of threads used by this process. </ li></ul><ul><li><strong>get_threads</strong><font size="3"><strong><tt>()</tt></ strong></font><br>Return threads opened by process as a list of namedtuples incl uding thread id and thread CPU times (user/system). </li></ul><blockquote><i><st rong>New in 0.2.1</strong></i>

	61 </blockquote><ul><li><strong>get_cpu_times</strong><font size="3"><strong><tt>() </tt></strong></font><br>Return a tuple whose values are process CPU user and sy stem times which means the amount of time expressed in seconds that a process ha s spent in <a href="http://stackoverflow.com/questions/556405/what-do-real-user- and-sys-mean-in-the-output-of-time1" rel="nofollow">user/system mode</a>. </li>< /ul><ul><li><strong>get_cpu_percent</strong><font size="3"><strong><tt>(</tt></s trong></font><i>interval=0.1</i><font size="3"><strong><tt>)</tt></strong></font ><br>Return a float representing the process CPU utilization as a percentage. Wh en interval is > 0.0 compares process times to system CPU times elapsed befor e and after the interval (blocking). When interval is 0.0 or None compares proce ss times to system CPU times elapsed since last call, returning immediately. In this case is recommended for accuracy that this function be called with at least 0.1 seconds between calls. </li></ul><blockquote><i><strong>Changed in 0.2.0:</ strong> interval parameter was added</i>

	62 </blockquote><ul><li><strong>get_memory_info</strong><font size="3"><strong><tt> ()</tt></strong></font><br>Return a tuple representing <a href="http://en.wikipe dia.org/wiki/Resident_Set_Size" rel="nofollow">RSS</a> (Resident Set Size) and V MS (Virtual Memory Size) in bytes.<br>On UNIX RSS and VMS are the same values sh own by ps. On Windows RSS and VMS refer to "Mem Usage" and "VM Size" columns of taskmgr.exe. </li></ul><ul><li><strong>get_memory_percent</strong><font size="3" ><strong><tt>()</tt></strong></font><br>Compare physical system memory to proces s resident memory and calculate process memory utilization as a percentage. </li ></ul><ul><li><strong>get_children</strong><font size="3"><strong><tt>()</tt></s trong></font><br>Return the children of this process as a list of <tt>Process</t t> objects. </li></ul><ul><li><strong>get_open_files</strong><font size="3"><str ong><tt>()</tt></strong></font><br>Return files opened by process as a list of < a href="http://docs.python.org/library/collections.html?highlight=namedtuple#col lections.namedtuple" rel="nofollow">namedtuples</a> including file absolute path name and file descriptor. On <strong>FreeBSD</strong> this is done by parsing < a href="http://en.wikipedia.org/wiki/Lsof" rel="nofollow">lsof</a> command outpu t. If lsof is not installed on the system <a href="http://docs.python.org/librar y/exceptions.html?highlight=notimplementederror#exceptions.NotImplementedError" rel="nofollow">NotImplementedError</a> exception is raised. Example: </li><pre class="prettyprint">>>> import psutil, os

	63 >>> f = open('file.ext', 'w')

	64 >>> p = psutil.Process(os.getpid())

	65 >>> p.get_open_files()

	66 [openfile(path='/home/giampaolo/svn/psutil/file.ext', fd=3)]</pre></ul><blockquo te><i><strong>Changed in 0.2.1:</strong> OSX implementation rewritten in C; no l onger requiring lsof.</i>

	67 </blockquote><ul><li><strong>get_connections</strong><font size="3"><strong><tt> ()</tt></strong></font><br>Return all TCP and UPD connections opened by process as a list of <a href="http://docs.python.org/library/collections.html?highlight= namedtuple#collections.namedtuple" rel="nofollow">namedtuples</a>. Every namedtu ple provides 6 attributes:<br><br> </li><ul><li><strong>fd</strong>: the socket file descriptor. This can be passed to <a href="http://docs.python.org/library/s ocket.html#socket.fromfd" rel="nofollow">socket.fromfd</a> to obtain a usable so cket object. This is only available on UNIX; on Windows <tt>-1</tt> is always re turned.<br> </li><li><strong>family</strong>: the address family, either <a href ="http://docs.python.org/library/socket.html#socket.AF_INET" rel="nofollow">AF_I NET</a> or <a href="http://docs.python.org/library/socket.html#socket.AF_INET6" rel="nofollow">AF_INET6</a> <br> </li><li><strong>type</strong>: the address typ e, either <a href="http://docs.python.org/library/socket.html#socket.SOCK_STREAM " rel="nofollow">SOCK_STREAM</a> or <a href="http://docs.python.org/library/sock et.html#socket.SOCK_DGRAM" rel="nofollow">SOCK_DGRAM</a> <br> </li><li><strong>l ocal_address</strong>: the local address as a <tt>(ip, port)</tt> tuple. <br> </ li><li><strong>remote_address</strong>: the remote address as a <tt>(ip, port)</ tt> tuple. When the remote endpoint is not connected the tuple is empty. <br> </ li><li><strong>status</strong>: a string representing the TCP connections status . String values are supposed to match Linux's <a href="http://students.mimuw.edu .pl/lxr/source/include/net/tcp_states.h" rel="nofollow">tcp_states.h</a> header file across all platforms. For UDP sockets this is always going to be an empty s tring.<br> </li></ul></ul><blockquote>Example:

37 <pre class="prettyprint">>>> p = psutil.Process(1694)	68 <pre class="prettyprint">>>> p = psutil.Process(1694)

38 >>> p.name	69 >>> p.name

39 'firefox'	70 'firefox'

40 >>> p.get_connections()	71 >>> p.get_connections()

41 [connection(fd=115, family=2, type=1, local_address=('10.0.0.1', 48776 ), remote_address=('93.186.135.91', 80), status='ESTABLISHED&#x27 ;),	72 [connection(fd=115, family=2, type=1, local_address=('10.0.0.1', 48776), remote_ address=('93.186.135.91', 80), status='ESTABLISHED'),

42 connection(fd=117, family=2, type=1, local_address=('10.0.0.1', 43761 ), remote_address=('72.14.234.100', 80), status='CLOSING'),	73 connection(fd=117, family=2, type=1, local_address=('10.0.0.1', 43761), remote_ address=('72.14.234.100', 80), status='CLOSING'),

43 connection(fd=119, family=2, type=1, local_address=('10.0.0.1', 60759 ), remote_address=('72.14.234.104', 80), status='ESTABLISHED&#x27 ;),	74 connection(fd=119, family=2, type=1, local_address=('10.0.0.1', 60759), remote_ address=('72.14.234.104', 80), status='ESTABLISHED'),

44 connection(fd=123, family=2, type=1, local_address=('10.0.0.1', 51314 ), remote_address=('72.14.234.83', 443), status='SYN_SENT')] </pre>On <strong>OSX</strong> and <strong>FreeBSD</strong> this is implemented b y parsing <a href="http://en.wikipedia.org/wiki/Lsof" rel="nofollow">lsof</a> co mmand output. If lsof is not installed on the system <a href="http://docs.python .org/library/exceptions.html?highlight=notimplementederror#exceptions.NotImpleme ntedError" rel="nofollow">NotImplementedError</a> exception is raised. For third party processes (different than <tt>os.getpid()</tt>) results can differ depend ing on user privileges.<br>	75 connection(fd=123, family=2, type=1, local_address=('10.0.0.1', 51314), remote_ address=('72.14.234.83', 443), status='SYN_SENT')]</pre>On <strong>FreeBSD</stro ng> this is implemented by parsing <a href="http://en.wikipedia.org/wiki/Lsof" r el="nofollow">lsof</a> command output. If lsof is not installed on the system <a href="http://docs.python.org/library/exceptions.html?highlight=notimplementeder ror#exceptions.NotImplementedError" rel="nofollow">NotImplementedError</a> excep tion is raised and for third party processes (different than <tt>os.getpid()</tt >) results can differ depending on user privileges.<br>

45 </blockquote><blockquote><i>New in 0.2.0</i>	76 </blockquote><blockquote><i><strong>Changed in 0.2.1:</strong> OSX implementatio n rewritten in C; no longer requiring lsof.</i>

46 </blockquote><ul><li><strong>is_running</strong><font size="3"><strong><tt>()</t t></strong></font><br>Return whether the current process is running in the curre nt process list. </li></ul><ul><li><strong>suspend</strong><font size="3"><stron g><tt>()</tt></strong></font><br>Suspend process execution. </li></ul><ul><li><s trong>resume</strong><font size="3"><strong><tt>()</tt></strong></font><br>Resum e process execution. </li></ul><ul><li><strong>terminate</strong><font size="3"> <strong><tt>()</tt></strong></font><br>Terminate the process with <tt>SIGTERM</t t> signal. On Windows this is an alias for <tt>kill()</tt>. </li></ul><blockquot e><i>New in 0.2.0</i>	77 </blockquote><ul><li><strong>is_running</strong><font size="3"><strong><tt>()</t t></strong></font><br>Return whether the current process is running in the curre nt process list. </li></ul><ul><li><strong>send_signal</strong><font size="3"><s trong><tt>(</tt></strong></font><i>signal</i><font size="3"><strong><tt>)</tt></ strong></font><br>Send a signal to process (see <a href="http://docs.python.org/ library/signal.html" rel="nofollow">signal module</a> constants). On Windows onl y <tt>SIGTERM</tt> is valid and is treated as an alias for <tt>kill()</tt>. </li ></ul><ul><li><strong>suspend</strong><font size="3"><strong><tt>()</tt></strong ></font><br>Suspend process execution with <tt>SIGSTOP</tt> signal. On Windows t his is done by suspending all process threads execution. </li></ul><ul><li><stro ng>resume</strong><font size="3"><strong><tt>()</tt></strong></font><br>Resume p rocess execution with <tt>SIGCONT</tt> signal. On Windows this is done by resumi ng all process threads execution. </li></ul><ul><li><strong>terminate</strong><f ont size="3"><strong><tt>()</tt></strong></font><br>Terminate the process with < tt>SIGTERM</tt> signal. On Windows this is an alias for <tt>kill()</tt>. </li></ ul><ul><li><strong>kill</strong><font size="3"><strong><tt>()</tt></strong></fon t><br>Kill the current process by using <tt>SIGKILL</tt> signal. </li></ul><bloc kquote><i><strong>Changed in 0.2.0:</strong> no longer accepts <tt>sig</tt> keyw ord argument - use <tt>send_signal()</tt> instead. </i>

47 </blockquote><ul><li><strong>send_signal</strong><font size="3"><strong><tt>(</t t></strong></font><i>signal</i><font size="3"><strong><tt>)</tt></strong></font> <br>Send a signal to process (see <a href="http://docs.python.org/library/signal .html" rel="nofollow">signal module</a> constants). On Windows only <tt>SIGTERM< /tt> is valid and is treated as an alias for <tt>kill()</tt>. </li></ul><blockqu ote><i>New in 0.2.0</i>	78 </blockquote><ul><li><strong>wait</strong><font size="3"><strong><tt>(</tt></str ong></font><i>timeout=None</i><font size="3"><strong><tt>)</tt></strong></font>< br>Wait for process termination and if the process is a children of the current one also return the exit code, else <tt>None</tt>. On Windows there's no such li mitation (exit code is always returned). If the process is already terminated do es not raise <tt>NoSuchProcess</tt> exception but just return <tt>None</tt> imme diately. If <i>timeout</i> is specified and process is still alive raises <tt>Ti meoutExpired</tt> exception. </li></ul><blockquote><i><strong>New in 0.2.1</stro ng></i>

48 </blockquote><ul><li><strong>kill</strong><font size="3"><strong><tt>()</tt></st rong></font><br>Kill the current process by using <tt>SIGKILL</tt> signal. </li> </ul><blockquote><i>Changed in 0.2.0: no longer accepts <tt>sig</tt> keyword arg ument - use <tt>send_signal()</tt> instead. </i>	79 </blockquote><p><br><br> psutil.<strong>Popen</strong><font size="3"><strong><tt >(</tt></strong></font><tt>args, *kwargs</tt><font size="3"><strong><tt>)</tt> </strong></font> </p><blockquote>A more convenient interface to stdlib <a href=" http://docs.python.org/library/subprocess.html#subprocess.Popen" rel="nofollow"> subprocess.Popen</a>. It starts a sub process and deals with it exactly as when using subprocess.Popen class but in addition also provides all the properties an d methods of psutil.Process class in a unique interface. For method names common to both classes such as <i>kill()</i> and <i>terminate()</i>, psutil.Process im plementation takes precedence. For a complete documentation refers to <a href="h ttp://docs.python.org/library/subprocess.html" rel="nofollow">subprocess module documentation</a>.

49 </blockquote><hr/><h2><a name="Functions"></a>Functions<a href="#Functions" clas s="section_anchor"></a></h2><p>psutil.<strong>get_pid_list</strong><font size="3 "><strong><tt>()</tt></strong></font><br> <blockquote>Return a list of current r unning PIDs.	80 <pre class="prettyprint">>>> import psutil

50 </blockquote></p><p>psutil.<strong>pid_exists</strong><font size="3"><strong><tt >(</tt></strong></font><i>pid</i><font size="3"><strong><tt>)</tt></strong></fon t><br> <blockquote>Check whether the given PID exists in the current process lis t.	81 >>> from subprocess import PIPE

51 </blockquote></p><p>psutil.<strong>process_iter</strong><font size="3"><strong>< tt>()</tt></strong></font><br> <blockquote>Return an iterator yielding a Process class instances for all running processes on the local machine.	82 >>> p = psutil.Popen(["/usr/bin/python", "-c", "print 'hi'"], stdout=PI PE)

52 </blockquote></p><hr/><h2><a name="System_related_objects"></a>System related ob jects<a href="#System_related_objects" class="section_anchor"></a></h2><p>psutil .<strong>cpu_percent</strong><font size="3"><strong><tt>(</tt></strong></font><i >interval=0.1</i><font size="3"><strong><tt>)</tt></strong></font><br> <blockquo te>Return a float representing the current system-wide CPU utilization as a perc entage. When interval is > 0.0 compares system CPU times elapsed before and a fter the interval (blocking). When interval is 0.0 or None compares system CPU t imes elapsed since last call or module import, returning immediately. In this ca se is recommended for accuracy that this function be called with at least 0.1 se conds between calls.	83 >>> p.name

53 </blockquote></p><blockquote><i>Changed in 0.2.0: interval parameter was added</ i>	84 'python'

54 </blockquote><p>psutil.<strong>cpu_times</strong><font size="3"><strong><tt>()</ tt></strong></font><br> <blockquote>Return system CPU times as a <tt>CPUTimes</t t> class object. Every CPU time is accessible in form of a <tt>CPUTimes</tt> att ribute and represents the time CPU has spent in the given mode.<br>The attribute s availability varies depending on the platform. Here follows a list of all ava ilable attributes:	85 >>> p.uids

55 </blockquote></p><blockquote>- <strong>user</strong><br>	86 user(real=1000, effective=1000, saved=1000)

56 - <strong>system</strong><br>	87 >>> p.username

57 - <strong>idle</strong><br>	88 'giampaolo'

58 - <strong>nice</strong> <i>(UNIX)</i><br>	89 >>> p.communicate()

59 - <strong>iowait</strong> <i>(Linux)</i><br>	90 ('hi\n', None)

60 - <strong>irq</strong> <i>(Linux, FreeBSD)</i><br>	91 >>> p.wait(timeout=2)

61 - <strong>softirq</strong> <i>(Linux)</i><br>	92 0

62 </blockquote><p>psutil.<strong>TOTAL_PHYMEM</strong><br> psutil.<strong>avail_ph ymem</strong><font size="3"><strong><tt>()</tt></strong></font><br> psutil.<stro ng>used_phymem</strong><font size="3"><strong><tt>()</tt></strong></font><br> <b lockquote>Return the amount of total, available and used physical memory on the system, in bytes.	93 >>></pre></blockquote><blockquote><i><strong>New in 0.2.1</strong></i>

63 </blockquote></p><p>psutil.<strong>cached_phymem</strong><font size="3"><strong> <tt>()</tt></strong></font><br> <blockquote>Return the amount of cached memory o n the system, in bytes. This reflects the "cached" column of free comm and line utility on Linux.	94 </blockquote><hr><h2><a name="Functions"></a>Functions<a href="http://code.googl e.com/p/psutil/wiki/DocumentationDev?show=content#Functions" class="section_anch or"></a></h2><p>psutil.<strong>get_pid_list</strong><font size="3"><strong><tt>( )</tt></strong></font><br> </p><blockquote>Return a list of current running PIDs .

64 </blockquote></p><blockquote><i>New in 0.2.0</i><br><i>Availability: <strong>Lin ux</strong></i>	95 </blockquote><p></p><p>psutil.<strong>pid_exists</strong><font size="3"><strong> <tt>(</tt></strong></font><i>pid</i><font size="3"><strong><tt>)</tt></strong></ font><br> </p><blockquote>Check whether the given PID exists in the current proc ess list. This is faster than doing <tt>pid in psutil.get_pid_list()</tt> and sh ould be preferred.

65 </blockquote><p>psutil.<strong>phymem_buffers</strong><font size="3"><strong><tt >()</tt></strong></font><br> <blockquote>Return the amount of physical memory bu ffers used by the kernel in bytes. This reflects the "buffers" column of free command line utility on Linux.	96 </blockquote><p></p><p>psutil.<strong>process_iter</strong><font size="3"><stron g><tt>()</tt></strong></font><br> </p><blockquote>Return an iterator yielding a Process class instances for all running processes on the local machine. This sho uld be preferred over doing <tt>for pid in psutil.get_pid_list(): psutil.Process (pid)</tt> as it safe from race conditions.

66 </blockquote></p><blockquote><i>New in 0.2.0</i><br><i>Availability: <strong>Lin ux</strong></i>	97 </blockquote><p></p><hr><h2><a name="System_related_functions"></a>System relate d functions<a href="http://code.google.com/p/psutil/wiki/DocumentationDev?show=c ontent#System_related_functions" class="section_anchor"></a></h2><h3><a name="CP U"></a>CPU<a href="http://code.google.com/p/psutil/wiki/DocumentationDev?show=co ntent#CPU" class="section_anchor"></a></h3><p>psutil.<strong>cpu_percent</strong ><font size="3"><strong><tt>(</tt></strong></font><i>interval=0.1, percpu=False< /i><font size="3"><strong><tt>)</tt></strong></font><br> </p><blockquote>Return a float representing the current system-wide CPU utilization as a percentage. Wh en interval is > 0.0 compares system CPU times elapsed before and after the i nterval (blocking). When interval is 0.0 or None compares system CPU times elaps ed since last call or module import, returning immediately. In this case is reco mmended for accuracy that this function be called with at least 0.1 seconds betw een calls.<br>When <i>percpu</i> is True returns a list of floats representing t he utilization as a percentage for each CPU. First element of the list refers t o first CPU, second element to second CPU and so on. The order of the list is co nsistent across calls.

67 </blockquote><p>psutil.<strong>total_virtmem</strong><font size="3"><strong><tt> ()</tt></strong></font><br> psutil.<strong>avail_virtmem</strong><font size="3"> <strong><tt>()</tt></strong></font><br> psutil.<strong>used_virtmem</strong><fon t size="3"><strong><tt>()</tt></strong></font><br> <blockquote>Return the amount of total, available and used virtual memory on the system, in bytes.<br>On Linu x they match the values returned by <tt>free</tt> command line utility. On OS X and FreeBSD they represent the same values as returned by <tt>sysctl vm.vmtotal< /tt>. On Windows they are determined by reading the <tt>*PageFile</tt> values of <a href="http://msdn.microsoft.com/en-us/library/aa366770(VS.85).aspx" rel="nof ollow">MEMORYSTATUSEX</a> structure.	98 </blockquote><p></p><pre class="prettyprint">>>> # blocking, system-wid e

68 </blockquote></p>	99 >>> psutil.cpu_percent(interval=1)

69 </td>	100 2.0

70 </tr>	101 >>>

71 </table>	102 >>> # blocking, per-cpu

	103 >>> psutil.cpu_percent(interval=1, percpu=True)

	104 [2.0, 1.0]

	105 >>>

	106 >>> # non-blocking (percentage since last call)

	107 >>> psutil.cpu_percent(interval=0)

	108 2.9

	109 >>></pre><blockquote><i><strong>Changed in 0.2.0:</strong> interval par ameter was added</i><br><i><strong>Changed in 0.3.0:</strong> percpu parameter w as added</i>

	110 </blockquote><p>psutil.<strong>cpu_times</strong><font size="3"><strong><tt>(</t t></strong></font><i>percpu=False</i><font size="3"><strong><tt>)</tt></strong>< /font><br> </p><blockquote>Return system CPU times as a namedtuple. Every attrib ute represents the time CPU has spent in the given mode.<br>The attributes avail ability varies depending on the platform. Here follows a list of all available attributes:

	111 </blockquote><blockquote>- user<br>

	112 - system<br>

	113 - idle<br>

	114 - nice <i>(UNIX)</i><br>

	115 - iowait <i>(Linux)</i><br>

	116 - irq <i>(Linux, FreeBSD)</i><br>

	117 - softirq <i>(Linux)</i>

	118 </blockquote><p></p><blockquote>When <i>percpu</i> is True return a list of name duples for each CPU. First element of the list refers to first CPU, second eleme nt to second CPU and so on. The order of the list is consistent across calls.

	119 </blockquote><blockquote><i><strong>Changed in 0.3.0:</strong> percpu parameter was added</i>

	120 </blockquote><hr><h3><a name="Memory"></a>Memory<a href="http://code.google.com/ p/psutil/wiki/DocumentationDev?show=content#Memory" class="section_anchor"></a>< /h3><p>psutil.<strong>phymem_usage</strong><font size="3"><strong><tt>()</tt></s trong></font><br> </p><blockquote>Return the amount of total, used and free phys ical memory on the system in bytes plus the percentage usage.

	121 <p></p><pre class="prettyprint">>>> psutil.phymem_usage()

	122 usage(total=4153868288, used=2854199296, free=1299668992, percent=34.6)</pre><i> <strong>New in 0.3.0</strong></i>

	123 </blockquote><p>psutil.<strong>virtmem_usage</strong><font size="3"><strong><tt> ()</tt></strong></font><br> </p><blockquote>Return the amount of total, used and free virtual memory on the system in bytes plus the percentage usage.<br>On Lin ux they match the values returned by <tt>free</tt> command line utility. On OS X and FreeBSD they represent the same values as returned by <tt>sysctl vm.vmtotal </tt>. On Windows they are determined by reading the <tt>*PageFile</tt> values o f <a href="http://msdn.microsoft.com/en-us/library/aa366770(VS.85).aspx" rel="no follow">MEMORYSTATUSEX</a> structure.

	124 <p></p><pre class="prettyprint">>>> psutil.virtmem_usage()

	125 usage(total=2097147904, used=4096, free=2097143808, percent=0.0)</pre><i><strong >New in 0.3.0</strong></i>

	126 </blockquote><p>psutil.<strong>cached_phymem</strong><font size="3"><strong><tt> ()</tt></strong></font><br> psutil.<strong>phymem_buffers</strong><font size="3" ><strong><tt>()</tt></strong></font><br> </p><blockquote>Return the amount of ca ched memory and physical memory buffers on the system, in bytes. Thet reflects t he "cached" and "buffers" columns of free command line utility on Linux.

	127 </blockquote><p></p><blockquote><i><strong>Availability:</strong> Linux</i>

	128 </blockquote><p>psutil.<strong>avail_phymem</strong><font size="3"><strong><tt>( )</tt></strong></font><br> psutil.<strong>used_phymem</strong><font size="3"><st rong><tt>()</tt></strong></font><br> psutil.<strong>total_virtmem</strong><font size="3"><strong><tt>()</tt></strong></font><br> psutil.<strong>avail_virtmem</s trong><font size="3"><strong><tt>()</tt></strong></font><br> psutil.<strong>used _virtmem</strong><font size="3"><strong><tt>()</tt></strong></font><br> </p><blo ckquote>These functions are deprecated by <i>psutil.phymem_usage()</i> and <i>ps util.virtmem_usage()</i>. Use them instead.

	129 </blockquote><p></p><blockquote><i><strong>Deprecated in 0.3.0</strong></i>

	130 </blockquote><hr><h3><a name="Disk"></a>Disk<a href="http://code.google.com/p/ps util/wiki/DocumentationDev?show=content#Disk" class="section_anchor"></a></h3><p >psutil.<strong>disk_partitions</strong><font size="3"><strong><tt>(</tt></stron g></font><i>all=False</i><font size="3"><strong><tt>)</tt></strong></font><br> < /p><blockquote>Return all mounted disk partitions as a list of namedtuples inclu ding device, mount point and filesystem type, similarly to "df" command on posix . <br>If <i>all</i> parameter is False return physical devices only (e.g. hard d isks, cd-rom drives, USB keys) and ignore all others (e.g. memory partitions suc h as <a href="http://www.cyberciti.biz/tips/what-is-devshm-and-its-practical-usa ge.html" rel="nofollow">/dev/shm</a>).<br> Namedtuple's 'fstype' field is a stri ng which varies depending on the platform. <br>On Linux it can be one of the val ues found in /proc/filesystems (e.g. 'ext3' for an ext3 hard drive o 'iso9660' f or the CD-ROM drive). <br>On Windows it is determined via <a href="http://msdn.m icrosoft.com/en-us/library/aa364939(v=vs.85).aspx" rel="nofollow">GetDriveType</ a> and can be either "removable", "fixed", "remote", "cdrom", "unmounted" or "ra mdisk". <br>On OSX and FreeBSD it is retrieved via <a href="http://www.manpagez. com/man/2/getfsstat/" rel="nofollow">getfsstat(2)</a>. <br>See <a href="http://p sutil.googlecode.com/svn/trunk/examples/disk_usage.py" rel="nofollow">examples/d isk_usage.py</a> script providing an example usage.

	131 <p></p><pre class="prettyprint">>>> psutil.get_partitions()

	132 [partition(device='/dev/sda3', mountpoint='/', fstype='ext4'),

	133 partition(device='/dev/sda7', mountpoint='/home', fstype='ext4')]

	134 >>></pre></blockquote><blockquote><i><strong>New in 0.3.0</strong></i>

	135 </blockquote><p>psutil.<strong>disk_usage</strong><font size="3"><strong><tt>(</ tt></strong></font><i>path</i><font size="3"><strong><tt>)</tt></strong></font>< br> </p><blockquote>Return disk usage statistics about the given <i>path</i> as a namedtuple including total, used and free space expressed in bytes plus the pe rcentage usage. OSError is raised if path does not exist. See <a href="http://ps util.googlecode.com/svn/trunk/examples/disk_usage.py" rel="nofollow">examples/di sk_usage.py</a> script providing an example usage.

	136 <p></p><pre class="prettyprint">>>> psutil.disk_usage('/')

	137 usage(total=21378641920, used=4809781248, free=15482871808, percent=22.5)</pre>< /blockquote><blockquote><i><strong>New in 0.3.0</strong></i>

	138 </blockquote><hr><h2><a name="Constants"></a>Constants<a href="http://code.googl e.com/p/psutil/wiki/DocumentationDev?show=content#Constants" class="section_anch or"></a></h2><p>psutil.<strong>TOTAL_PHYMEM</strong><br> </p><blockquote>The amo unt of total physical memory on the system, in bytes.

	139 </blockquote><p></p><p>psutil.<strong>NUM_CPUS</strong><br> </p><blockquote>The number of CPUs on the system. This is preferable than using <tt>os.environ['NUMB ER_OF_PROCESSORS']</tt> as it is more accurate and always available.

	140 </blockquote><p></p><p>psutil.<strong>BOOT_TIME</strong><br> </p><blockquote>A n umber indicating the system boot time expressed in seconds since the epoch.

	141 </blockquote><p></p><blockquote><i><strong>New in 0.2.1</strong></i>

	142 </blockquote><p>psutil.<strong>ABOVE_NORMAL_PRIORITY_CLASS</strong><br> psutil.< strong>BELOW_NORMAL_PRIORITY_CLASS</strong><br> psutil.<strong>HIGH_PRIORITY_CLA SS</strong><br> psutil.<strong>IDLE_PRIORITY_CLASS</strong><br> psutil.<strong>N ORMAL_PRIORITY_CLASS</strong><br> psutil.<strong>REALTIME_PRIORITY_CLASS</strong ><br> </p><blockquote>A set of integers representing the priority of a process o n Windows (see <a href="http://msdn.microsoft.com/en-us/library/ms686219(v=vs.85 ).aspx" rel="nofollow">MSDN documentation</a>). They can be used in conjunction with <tt>psutil.Process.nice</tt> to get or set process priority.

	143 </blockquote><p></p><blockquote><i><strong>New in 0.2.1</strong></i><br><i><stro ng>Availability:</strong> Windows</i>

	144 </blockquote><p>psutil.<strong>IOPRIO_CLASS_NONE</strong><br> psutil.<strong>IOP RIO_CLASS_RT</strong><br> psutil.<strong>IOPRIO_CLASS_BE</strong><br> psutil.<st rong>IOPRIO_CLASS_IDLE</strong><br> </p><blockquote>A set of integers representi ng the I/O priority of a process on Linux. They can be used in conjunction with <tt>psutil.Process.get_ionice()</tt> and <tt>psutil.Process.set_ionice()</tt> to get or set process I/O priority. For further information refer to <a href="http ://linux.die.net/man/1/ionice" rel="nofollow">ionice</a> command line utility or <a href="http://linux.die.net/man/2/ioprio_get" rel="nofollow">ioprio_get</a> s ystem call.

	145 </blockquote><p></p><blockquote><i><strong>New in 0.2.1</strong></i><br><i><stro ng>Availability:</strong> Linux</i>

	146 </blockquote><p>psutil.<strong>STATUS_RUNNING</strong><br> psutil.<strong>STATUS _SLEEPING</strong><br> psutil.<strong>STATUS_DISK_SLEEP</strong><br> psutil.<str ong>STATUS_STOPPED</strong><br> psutil.<strong>STATUS_TRACING_STOP</strong><br> psutil.<strong>STATUS_ZOMBIE</strong><br> psutil.<strong>STATUS_DEAD</strong><br > psutil.<strong>STATUS_WAKE_KILL</strong><br> psutil.<strong>STATUS_WAKING</str ong><br> psutil.<strong>STATUS_IDLE</strong><br> psutil.<strong>STATUS_LOCKED</s trong><br> psutil.<strong>STATUS_WAITING</strong><br> </p><blockquote>A set of i ntegers representing the status of a process. To be used in conjunction with <tt >psutil.Process.status</tt> property. If used with str() return a human-readable status string.

	147 </blockquote><p></p><blockquote><i><strong>New in 0.2.1</strong></i><br><i><stro ng>

	148 </strong></i></blockquote>

	149 </div>

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