/opt/imh-python/lib/python3.9/site-packages/celery/utils
Edit: /opt/imh-python/lib/python3.9/site-packages/celery/utils/debug.py (4709B)
"""Utilities for debugging memory usage, blocking calls, etc."""
import os
import sys
import traceback
from contextlib import contextmanager
from functools import partial
from pprint import pprint
from celery.platforms import signals
from celery.utils.text import WhateverIO
try:
from psutil import Process
except ImportError:
Process = None
__all__ = (
'blockdetection', 'sample_mem', 'memdump', 'sample',
'humanbytes', 'mem_rss', 'ps', 'cry',
)
UNITS = (
(2 ** 40.0, 'TB'),
(2 ** 30.0, 'GB'),
(2 ** 20.0, 'MB'),
(2 ** 10.0, 'KB'),
(0.0, 'b'),
)
_process = None
_mem_sample = []
def _on_blocking(signum, frame):
import inspect
raise RuntimeError(
f'Blocking detection timed-out at: {inspect.getframeinfo(frame)}'
)
@contextmanager
def blockdetection(timeout):
"""Context that raises an exception if process is blocking.
Uses ``SIGALRM`` 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): # pragma: no cover
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): # pragma: no cover
"""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(f'- > {mem},')
say(f'- rss (end): {after_collect}.')
def sample(x, n, k=0):
"""Given a list `x` a sample of length ``n`` of that list is returned.
For example, if `n` is 10, and `x` has 100 items, a list of every tenth.
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.
Arguments:
f (float): The floating point number.
p (int): Floating point precision (default is 5).
"""
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(
f'{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(_process_memory_info(p).rss)
def ps(): # pragma: no cover
"""Return the global :class:`psutil.Process` instance.
Note:
Returns :const:`None` if :pypi:`psutil` is not installed.
"""
global _process
if _process is None and Process is not None:
_process = Process(os.getpid())
return _process
def _process_memory_info(process):
try:
return process.memory_info()
except AttributeError:
return process.get_memory_info()
def cry(out=None, sepchr='=', seplen=49): # pragma: no cover
"""Return stack-trace of all active threads.
See Also:
Taken from https://gist.github.com/737056.
"""
import threading
out = WhateverIO() if out is None else out
P = partial(print, file=out)
# get a map of threads by their ID so we can print their names
# during the traceback dump
tmap = {t.ident: t for t in threading.enumerate()}
sep = sepchr * seplen
for tid, frame in sys._current_frames().items():
thread = tmap.get(tid)
if not thread:
# skip old junk (left-overs from a fork)
continue
P(f'{thread.name}')
P(sep)
traceback.print_stack(frame, file=out)
P(sep)
P('LOCAL VARIABLES')
P(sep)
pprint(frame.f_locals, stream=out)
P('\n')
return out.getvalue()