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2to3.rst.txt	14647	0644	editdlrm
abc.rst.txt	7219	0644	editdlrm
aepack.rst.txt	4257	0644	editdlrm
aetools.rst.txt	3532	0644	editdlrm
aetypes.rst.txt	4257	0644	editdlrm
aifc.rst.txt	7086	0644	editdlrm
al.rst.txt	5309	0644	editdlrm
allos.rst.txt	695	0644	editdlrm
anydbm.rst.txt	4111	0644	editdlrm
archiving.rst.txt	424	0644	editdlrm
argparse.rst.txt	74685	0644	editdlrm
array.rst.txt	10524	0644	editdlrm
ast.rst.txt	10111	0644	editdlrm
asynchat.rst.txt	9206	0644	editdlrm
asyncore.rst.txt	12937	0644	editdlrm
atexit.rst.txt	3910	0644	editdlrm
audioop.rst.txt	10395	0644	editdlrm
autogil.rst.txt	1015	0644	editdlrm
base64.rst.txt	6252	0644	editdlrm
basehttpserver.rst.txt	10404	0644	editdlrm
bastion.rst.txt	2611	0644	editdlrm
bdb.rst.txt	12456	0644	editdlrm
binascii.rst.txt	6508	0644	editdlrm
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calendar.rst.txt	11282	0644	editdlrm
carbon.rst.txt	15956	0644	editdlrm
cd.rst.txt	11974	0644	editdlrm
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code.rst.txt	7115	0644	editdlrm
codecs.rst.txt	66966	0644	editdlrm
codeop.rst.txt	3774	0644	editdlrm
collections.rst.txt	41448	0644	editdlrm
colorpicker.rst.txt	913	0644	editdlrm
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commands.rst.txt	2595	0644	editdlrm
compileall.rst.txt	4678	0644	editdlrm
compiler.rst.txt	37464	0644	editdlrm
configparser.rst.txt	19607	0644	editdlrm
constants.rst.txt	2328	0644	editdlrm
contextlib.rst.txt	6012	0644	editdlrm
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crypt.rst.txt	2292	0644	editdlrm
crypto.rst.txt	355	0644	editdlrm
csv.rst.txt	22757	0644	editdlrm
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curses.ascii.rst.txt	9046	0644	editdlrm
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curses.rst.txt	74877	0644	editdlrm
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datetime.rst.txt	74679	0644	editdlrm
dbhash.rst.txt	3865	0644	editdlrm
dbm.rst.txt	3117	0644	editdlrm
debug.rst.txt	446	0644	editdlrm
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development.rst.txt	640	0644	editdlrm
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dircache.rst.txt	1813	0644	editdlrm
dis.rst.txt	23248	0644	editdlrm
distribution.rst.txt	426	0644	editdlrm
distutils.rst.txt	1958	0644	editdlrm
dl.rst.txt	3392	0644	editdlrm
doctest.rst.txt	73985	0644	editdlrm
docxmlrpcserver.rst.txt	3802	0644	editdlrm
dumbdbm.rst.txt	2841	0644	editdlrm
dummy_thread.rst.txt	1058	0644	editdlrm
dummy_threading.rst.txt	799	0644	editdlrm
easydialogs.rst.txt	10346	0644	editdlrm
email-examples.rst.txt	1271	0644	editdlrm
email.charset.rst.txt	9654	0644	editdlrm
email.encoders.rst.txt	2376	0644	editdlrm
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email.generator.rst.txt	6132	0644	editdlrm
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email.mime.rst.txt	9917	0644	editdlrm
email.parser.rst.txt	10327	0644	editdlrm
email.rst.txt	16111	0644	editdlrm
email.utils.rst.txt	6475	0644	editdlrm
ensurepip.rst.txt	5022	0644	editdlrm
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exceptions.rst.txt	18343	0644	editdlrm
fcntl.rst.txt	7361	0644	editdlrm
filecmp.rst.txt	5348	0644	editdlrm
fileformats.rst.txt	302	0644	editdlrm
fileinput.rst.txt	7417	0644	editdlrm
filesys.rst.txt	806	0644	editdlrm
fl.rst.txt	17646	0644	editdlrm
fm.rst.txt	2699	0644	editdlrm
fnmatch.rst.txt	3104	0644	editdlrm
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fpectl.rst.txt	4171	0644	editdlrm
fpformat.rst.txt	1747	0644	editdlrm
fractions.rst.txt	5297	0644	editdlrm
framework.rst.txt	11444	0644	editdlrm
frameworks.rst.txt	378	0644	editdlrm
ftplib.rst.txt	15720	0644	editdlrm
functions.rst.txt	75554	0644	editdlrm
functools.rst.txt	7448	0644	editdlrm
future_builtins.rst.txt	2010	0644	editdlrm
gc.rst.txt	9014	0644	editdlrm
gdbm.rst.txt	4882	0644	editdlrm
gensuitemodule.rst.txt	3113	0644	editdlrm
getopt.rst.txt	6670	0644	editdlrm
getpass.rst.txt	1876	0644	editdlrm
gettext.rst.txt	29040	0644	editdlrm
gl.rst.txt	6009	0644	editdlrm
glob.rst.txt	2414	0644	editdlrm
grp.rst.txt	2256	0644	editdlrm
gzip.rst.txt	4828	0644	editdlrm
hashlib.rst.txt	7379	0644	editdlrm
heapq.rst.txt	13185	0644	editdlrm
hmac.rst.txt	3073	0644	editdlrm
hotshot.rst.txt	4289	0644	editdlrm
htmllib.rst.txt	7379	0644	editdlrm
htmlparser.rst.txt	11640	0644	editdlrm
httplib.rst.txt	37454	0644	editdlrm
i18n.rst.txt	409	0644	editdlrm
ic.rst.txt	5005	0644	editdlrm
idle.rst.txt	22182	0644	editdlrm
imageop.rst.txt	4001	0644	editdlrm
imaplib.rst.txt	17221	0644	editdlrm
imgfile.rst.txt	2765	0644	editdlrm
imghdr.rst.txt	2635	0644	editdlrm
imp.rst.txt	12593	0644	editdlrm
importlib.rst.txt	1126	0644	editdlrm
imputil.rst.txt	7023	0644	editdlrm
index.rst.txt	2287	0644	editdlrm
inspect.rst.txt	28151	0644	editdlrm
internet.rst.txt	950	0644	editdlrm
intro.rst.txt	2803	0644	editdlrm
io.rst.txt	39015	0644	editdlrm
ipc.rst.txt	630	0644	editdlrm
itertools.rst.txt	36324	0644	editdlrm
jpeg.rst.txt	3858	0644	editdlrm
json.rst.txt	25545	0644	editdlrm
keyword.rst.txt	617	0644	editdlrm
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linecache.rst.txt	1887	0644	editdlrm
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logging.config.rst.txt	31560	0644	editdlrm
logging.handlers.rst.txt	28153	0644	editdlrm
logging.rst.txt	46882	0644	editdlrm
mac.rst.txt	791	0644	editdlrm
macos.rst.txt	3824	0644	editdlrm
macosa.rst.txt	3964	0644	editdlrm
macostools.rst.txt	4017	0644	editdlrm
macpath.rst.txt	650	0644	editdlrm
mailbox.rst.txt	68129	0644	editdlrm
mailcap.rst.txt	3675	0644	editdlrm
markup.rst.txt	1249	0644	editdlrm
marshal.rst.txt	5689	0644	editdlrm
math.rst.txt	10920	0644	editdlrm
md5.rst.txt	2815	0644	editdlrm
mhlib.rst.txt	3966	0644	editdlrm
mimetools.rst.txt	4504	0644	editdlrm
mimetypes.rst.txt	9839	0644	editdlrm
mimewriter.rst.txt	3360	0644	editdlrm
mimify.rst.txt	3519	0644	editdlrm
miniaeframe.rst.txt	2564	0644	editdlrm
misc.rst.txt	248	0644	editdlrm
mm.rst.txt	447	0644	editdlrm
mmap.rst.txt	10481	0644	editdlrm
modulefinder.rst.txt	3380	0644	editdlrm
modules.rst.txt	382	0644	editdlrm
msilib.rst.txt	19062	0644	editdlrm
msvcrt.rst.txt	4346	0644	editdlrm
multifile.rst.txt	6613	0644	editdlrm
multiprocessing.rst.txt	92621	0644	editdlrm
mutex.rst.txt	1939	0644	editdlrm
netdata.rst.txt	432	0644	editdlrm
netrc.rst.txt	3119	0644	editdlrm
new.rst.txt	2653	0644	editdlrm
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numbers.rst.txt	8007	0644	editdlrm
numeric.rst.txt	751	0644	editdlrm
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optparse.rst.txt	77101	0644	editdlrm
os.path.rst.txt	13094	0644	editdlrm
os.rst.txt	82580	0644	editdlrm
ossaudiodev.rst.txt	17309	0644	editdlrm
othergui.rst.txt	2721	0644	editdlrm
parser.rst.txt	15385	0644	editdlrm
pdb.rst.txt	16043	0644	editdlrm
persistence.rst.txt	826	0644	editdlrm
pickle.rst.txt	37262	0644	editdlrm
pickletools.rst.txt	1997	0644	editdlrm
pipes.rst.txt	3786	0644	editdlrm
pkgutil.rst.txt	7714	0644	editdlrm
platform.rst.txt	9554	0644	editdlrm
plistlib.rst.txt	4134	0644	editdlrm
popen2.rst.txt	7022	0644	editdlrm
poplib.rst.txt	6220	0644	editdlrm
posix.rst.txt	3630	0644	editdlrm
posixfile.rst.txt	7200	0644	editdlrm
pprint.rst.txt	9071	0644	editdlrm
profile.rst.txt	28666	0644	editdlrm
pty.rst.txt	1762	0644	editdlrm
pwd.rst.txt	2725	0644	editdlrm
pyclbr.rst.txt	3296	0644	editdlrm
pydoc.rst.txt	4083	0644	editdlrm
pyexpat.rst.txt	28891	0644	editdlrm
python.rst.txt	514	0644	editdlrm
py_compile.rst.txt	2479	0644	editdlrm
queue.rst.txt	7034	0644	editdlrm
quopri.rst.txt	2670	0644	editdlrm
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readline.rst.txt	10513	0644	editdlrm
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resource.rst.txt	9595	0644	editdlrm
restricted.rst.txt	3327	0644	editdlrm
rexec.rst.txt	11742	0644	editdlrm
rfc822.rst.txt	14037	0644	editdlrm
rlcompleter.rst.txt	2494	0644	editdlrm
robotparser.rst.txt	2190	0644	editdlrm
runpy.rst.txt	6938	0644	editdlrm
sched.rst.txt	4644	0644	editdlrm
scrolledtext.rst.txt	1379	0644	editdlrm
select.rst.txt	20705	0644	editdlrm
sets.rst.txt	14973	0644	editdlrm
sgi.rst.txt	322	0644	editdlrm
sgmllib.rst.txt	10664	0644	editdlrm
sha.rst.txt	2807	0644	editdlrm
shelve.rst.txt	8319	0644	editdlrm
shlex.rst.txt	11313	0644	editdlrm
shutil.rst.txt	13491	0644	editdlrm
signal.rst.txt	10719	0644	editdlrm
simplehttpserver.rst.txt	4559	0644	editdlrm
simplexmlrpcserver.rst.txt	10881	0644	editdlrm
site.rst.txt	7880	0644	editdlrm
smtpd.rst.txt	2464	0644	editdlrm
smtplib.rst.txt	14906	0644	editdlrm
sndhdr.rst.txt	1759	0644	editdlrm
socket.rst.txt	40765	0644	editdlrm
socketserver.rst.txt	22512	0644	editdlrm
someos.rst.txt	599	0644	editdlrm
spwd.rst.txt	2825	0644	editdlrm
sqlite3.rst.txt	35448	0644	editdlrm
ssl.rst.txt	76554	0644	editdlrm
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statvfs.rst.txt	1300	0644	editdlrm
stdtypes.rst.txt	122668	0644	editdlrm
string.rst.txt	44085	0644	editdlrm
stringio.rst.txt	4166	0644	editdlrm
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struct.rst.txt	17100	0644	editdlrm
subprocess.rst.txt	33648	0644	editdlrm
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sys.rst.txt	47520	0644	editdlrm
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tabnanny.rst.txt	1999	0644	editdlrm
tarfile.rst.txt	28214	0644	editdlrm
telnetlib.rst.txt	7482	0644	editdlrm
tempfile.rst.txt	10504	0644	editdlrm
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urllib.rst.txt	24960	0644	editdlrm
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xml.etree.elementtree.rst.txt	35707	0644	editdlrm
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__main__.rst.txt	535	0644	editdlrm

:mod:`resource` --- Resource usage information ============================================== .. module:: resource :platform: Unix :synopsis: An interface to provide resource usage information on the current process. .. moduleauthor:: Jeremy Hylton .. sectionauthor:: Jeremy Hylton This module provides basic mechanisms for measuring and controlling system resources utilized by a program. Symbolic constants are used to specify particular system resources and to request usage information about either the current process or its children. A single exception is defined for errors: .. exception:: error The functions described below may raise this error if the underlying system call failures unexpectedly. Resource Limits --------------- Resources usage can be limited using the :func:`setrlimit` function described below. Each resource is controlled by a pair of limits: a soft limit and a hard limit. The soft limit is the current limit, and may be lowered or raised by a process over time. The soft limit can never exceed the hard limit. The hard limit can be lowered to any value greater than the soft limit, but not raised. (Only processes with the effective UID of the super-user can raise a hard limit.) The specific resources that can be limited are system dependent. They are described in the :manpage:`getrlimit(2)` man page. The resources listed below are supported when the underlying operating system supports them; resources which cannot be checked or controlled by the operating system are not defined in this module for those platforms. .. data:: RLIM_INFINITY Constant used to represent the limit for an unlimited resource. .. function:: getrlimit(resource) Returns a tuple ``(soft, hard)`` with the current soft and hard limits of *resource*. Raises :exc:`ValueError` if an invalid resource is specified, or :exc:`error` if the underlying system call fails unexpectedly. .. function:: setrlimit(resource, limits) Sets new limits of consumption of *resource*. The *limits* argument must be a tuple ``(soft, hard)`` of two integers describing the new limits. A value of :data:`~resource.RLIM_INFINITY` can be used to request a limit that is unlimited. Raises :exc:`ValueError` if an invalid resource is specified, if the new soft limit exceeds the hard limit, or if a process tries to raise its hard limit. Specifying a limit of :data:`~resource.RLIM_INFINITY` when the hard or system limit for that resource is not unlimited will result in a :exc:`ValueError`. A process with the effective UID of super-user can request any valid limit value, including unlimited, but :exc:`ValueError` will still be raised if the requested limit exceeds the system imposed limit. ``setrlimit`` may also raise :exc:`error` if the underlying system call fails. These symbols define resources whose consumption can be controlled using the :func:`setrlimit` and :func:`getrlimit` functions described below. The values of these symbols are exactly the constants used by C programs. The Unix man page for :manpage:`getrlimit(2)` lists the available resources. Note that not all systems use the same symbol or same value to denote the same resource. This module does not attempt to mask platform differences --- symbols not defined for a platform will not be available from this module on that platform. .. data:: RLIMIT_CORE The maximum size (in bytes) of a core file that the current process can create. This may result in the creation of a partial core file if a larger core would be required to contain the entire process image. .. data:: RLIMIT_CPU The maximum amount of processor time (in seconds) that a process can use. If this limit is exceeded, a :const:`SIGXCPU` signal is sent to the process. (See the :mod:`signal` module documentation for information about how to catch this signal and do something useful, e.g. flush open files to disk.) .. data:: RLIMIT_FSIZE The maximum size of a file which the process may create. .. data:: RLIMIT_DATA The maximum size (in bytes) of the process's heap. .. data:: RLIMIT_STACK The maximum size (in bytes) of the call stack for the current process. This only affects the stack of the main thread in a multi-threaded process. .. data:: RLIMIT_RSS The maximum resident set size that should be made available to the process. .. data:: RLIMIT_NPROC The maximum number of processes the current process may create. .. data:: RLIMIT_NOFILE The maximum number of open file descriptors for the current process. .. data:: RLIMIT_OFILE The BSD name for :const:`RLIMIT_NOFILE`. .. data:: RLIMIT_MEMLOCK The maximum address space which may be locked in memory. .. data:: RLIMIT_VMEM The largest area of mapped memory which the process may occupy. .. data:: RLIMIT_AS The maximum area (in bytes) of address space which may be taken by the process. Resource Usage -------------- These functions are used to retrieve resource usage information: .. function:: getrusage(who) This function returns an object that describes the resources consumed by either the current process or its children, as specified by the *who* parameter. The *who* parameter should be specified using one of the :const:`RUSAGE_\*` constants described below. The fields of the return value each describe how a particular system resource has been used, e.g. amount of time spent running is user mode or number of times the process was swapped out of main memory. Some values are dependent on the clock tick internal, e.g. the amount of memory the process is using. For backward compatibility, the return value is also accessible as a tuple of 16 elements. The fields :attr:`ru_utime` and :attr:`ru_stime` of the return value are floating point values representing the amount of time spent executing in user mode and the amount of time spent executing in system mode, respectively. The remaining values are integers. Consult the :manpage:`getrusage(2)` man page for detailed information about these values. A brief summary is presented here: +--------+---------------------+-------------------------------+ | Index | Field | Resource | +========+=====================+===============================+ | ``0`` | :attr:`ru_utime` | time in user mode (float) | +--------+---------------------+-------------------------------+ | ``1`` | :attr:`ru_stime` | time in system mode (float) | +--------+---------------------+-------------------------------+ | ``2`` | :attr:`ru_maxrss` | maximum resident set size | +--------+---------------------+-------------------------------+ | ``3`` | :attr:`ru_ixrss` | shared memory size | +--------+---------------------+-------------------------------+ | ``4`` | :attr:`ru_idrss` | unshared memory size | +--------+---------------------+-------------------------------+ | ``5`` | :attr:`ru_isrss` | unshared stack size | +--------+---------------------+-------------------------------+ | ``6`` | :attr:`ru_minflt` | page faults not requiring I/O | +--------+---------------------+-------------------------------+ | ``7`` | :attr:`ru_majflt` | page faults requiring I/O | +--------+---------------------+-------------------------------+ | ``8`` | :attr:`ru_nswap` | number of swap outs | +--------+---------------------+-------------------------------+ | ``9`` | :attr:`ru_inblock` | block input operations | +--------+---------------------+-------------------------------+ | ``10`` | :attr:`ru_oublock` | block output operations | +--------+---------------------+-------------------------------+ | ``11`` | :attr:`ru_msgsnd` | messages sent | +--------+---------------------+-------------------------------+ | ``12`` | :attr:`ru_msgrcv` | messages received | +--------+---------------------+-------------------------------+ | ``13`` | :attr:`ru_nsignals` | signals received | +--------+---------------------+-------------------------------+ | ``14`` | :attr:`ru_nvcsw` | voluntary context switches | +--------+---------------------+-------------------------------+ | ``15`` | :attr:`ru_nivcsw` | involuntary context switches | +--------+---------------------+-------------------------------+ This function will raise a :exc:`ValueError` if an invalid *who* parameter is specified. It may also raise :exc:`error` exception in unusual circumstances. .. versionchanged:: 2.3 Added access to values as attributes of the returned object. .. function:: getpagesize() Returns the number of bytes in a system page. (This need not be the same as the hardware page size.) The following :const:`RUSAGE_\*` symbols are passed to the :func:`getrusage` function to specify which processes information should be provided for. .. data:: RUSAGE_SELF :const:`RUSAGE_SELF` should be used to request information pertaining only to the process itself. .. data:: RUSAGE_CHILDREN Pass to :func:`getrusage` to request resource information for child processes of the calling process. .. data:: RUSAGE_BOTH Pass to :func:`getrusage` to request resources consumed by both the current process and child processes. May not be available on all systems.