/usr/lib/python2.7/dist-packages/celery/utils/debug.py is in python-celery 3.1.20-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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"""
celery.utils.debug
~~~~~~~~~~~~~~~~~~
Utilities for debugging memory usage.
"""
from __future__ import absolute_import, print_function, unicode_literals
import os
from contextlib import contextmanager
from functools import partial
from celery.five import range
from celery.platforms import signals
try:
from psutil import Process
except ImportError:
Process = None # noqa
__all__ = [
'blockdetection', 'sample_mem', 'memdump', 'sample',
'humanbytes', 'mem_rss', 'ps',
]
UNITS = (
(2 ** 40.0, 'TB'),
(2 ** 30.0, 'GB'),
(2 ** 20.0, 'MB'),
(2 ** 10.0, 'kB'),
(0.0, '{0!d}b'),
)
_process = None
_mem_sample = []
def _on_blocking(signum, frame):
import inspect
raise RuntimeError(
'Blocking detection timed-out at: {0}'.format(
inspect.getframeinfo(frame)
)
)
@contextmanager
def blockdetection(timeout):
"""A timeout context using ``SIGALRM`` that can be used to detect blocking
functions."""
if not timeout:
yield
else:
old_handler = signals['ALRM']
old_handler = None if old_handler == _on_blocking else old_handler
signals['ALRM'] = _on_blocking
try:
yield signals.arm_alarm(timeout)
finally:
if old_handler:
signals['ALRM'] = old_handler
signals.reset_alarm()
def sample_mem():
"""Sample RSS memory usage.
Statistics can then be output by calling :func:`memdump`.
"""
current_rss = mem_rss()
_mem_sample.append(current_rss)
return current_rss
def _memdump(samples=10):
S = _mem_sample
prev = list(S) if len(S) <= samples else sample(S, samples)
_mem_sample[:] = []
import gc
gc.collect()
after_collect = mem_rss()
return prev, after_collect
def memdump(samples=10, file=None):
"""Dump memory statistics.
Will print a sample of all RSS memory samples added by
calling :func:`sample_mem`, and in addition print
used RSS memory after :func:`gc.collect`.
"""
say = partial(print, file=file)
if ps() is None:
say('- rss: (psutil not installed).')
return
prev, after_collect = _memdump(samples)
if prev:
say('- rss (sample):')
for mem in prev:
say('- > {0},'.format(mem))
say('- rss (end): {0}.'.format(after_collect))
def sample(x, n, k=0):
"""Given a list `x` a sample of length ``n`` of that list is returned.
E.g. if `n` is 10, and `x` has 100 items, a list of every 10th
item is returned.
``k`` can be used as offset.
"""
j = len(x) // n
for _ in range(n):
try:
yield x[k]
except IndexError:
break
k += j
def hfloat(f, p=5):
"""Convert float to value suitable for humans.
:keyword p: Float precision.
"""
i = int(f)
return i if i == f else '{0:.{p}}'.format(f, p=p)
def humanbytes(s):
"""Convert bytes to human-readable form (e.g. kB, MB)."""
return next(
'{0}{1}'.format(hfloat(s / div if div else s), unit)
for div, unit in UNITS if s >= div
)
def mem_rss():
"""Return RSS memory usage as a humanized string."""
p = ps()
if p is not None:
return humanbytes(p.get_memory_info().rss)
def ps():
"""Return the global :class:`psutil.Process` instance,
or :const:`None` if :mod:`psutil` is not installed."""
global _process
if _process is None and Process is not None:
_process = Process(os.getpid())
return _process
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