You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
312 lines
11 KiB
Python
312 lines
11 KiB
Python
# Copyright (c) 2018 gevent. See LICENSE for details.
|
|
from __future__ import print_function, absolute_import, division
|
|
|
|
import os
|
|
import sys
|
|
|
|
from weakref import ref as wref
|
|
|
|
from greenlet import getcurrent
|
|
|
|
from gevent import config as GEVENT_CONFIG
|
|
from gevent.monkey import get_original
|
|
from gevent.events import notify
|
|
from gevent.events import EventLoopBlocked
|
|
from gevent.events import MemoryUsageThresholdExceeded
|
|
from gevent.events import MemoryUsageUnderThreshold
|
|
from gevent.events import IPeriodicMonitorThread
|
|
from gevent.events import implementer
|
|
|
|
from gevent._tracer import GreenletTracer
|
|
from gevent._compat import thread_mod_name
|
|
from gevent._compat import perf_counter
|
|
from gevent._compat import get_this_psutil_process
|
|
|
|
|
|
|
|
__all__ = [
|
|
'PeriodicMonitoringThread',
|
|
]
|
|
|
|
get_thread_ident = get_original(thread_mod_name, 'get_ident')
|
|
start_new_thread = get_original(thread_mod_name, 'start_new_thread')
|
|
thread_sleep = get_original('time', 'sleep')
|
|
|
|
|
|
|
|
class MonitorWarning(RuntimeWarning):
|
|
"""The type of warnings we emit."""
|
|
|
|
|
|
class _MonitorEntry(object):
|
|
|
|
__slots__ = ('function', 'period', 'last_run_time')
|
|
|
|
def __init__(self, function, period):
|
|
self.function = function
|
|
self.period = period
|
|
self.last_run_time = 0
|
|
|
|
def __eq__(self, other):
|
|
return self.function == other.function and self.period == other.period
|
|
|
|
def __repr__(self):
|
|
return repr((self.function, self.period, self.last_run_time))
|
|
|
|
|
|
@implementer(IPeriodicMonitorThread)
|
|
class PeriodicMonitoringThread(object):
|
|
# This doesn't extend threading.Thread because that gets monkey-patched.
|
|
# We use the low-level 'start_new_thread' primitive instead.
|
|
|
|
# The amount of seconds we will sleep when we think we have nothing
|
|
# to do.
|
|
inactive_sleep_time = 2.0
|
|
|
|
# The absolute minimum we will sleep, regardless of
|
|
# what particular monitoring functions want to say.
|
|
min_sleep_time = 0.005
|
|
|
|
# The minimum period in seconds at which we will check memory usage.
|
|
# Getting memory usage is fairly expensive.
|
|
min_memory_monitor_period = 2
|
|
|
|
# A list of _MonitorEntry objects: [(function(hub), period, last_run_time))]
|
|
# The first entry is always our entry for self.monitor_blocking
|
|
_monitoring_functions = None
|
|
|
|
# The calculated min sleep time for the monitoring functions list.
|
|
_calculated_sleep_time = None
|
|
|
|
# A boolean value that also happens to capture the
|
|
# memory usage at the time we exceeded the threshold. Reset
|
|
# to 0 when we go back below.
|
|
_memory_exceeded = 0
|
|
|
|
# The instance of GreenletTracer we're using
|
|
_greenlet_tracer = None
|
|
|
|
def __init__(self, hub):
|
|
self._hub_wref = wref(hub, self._on_hub_gc)
|
|
self.should_run = True
|
|
|
|
# Must be installed in the thread that the hub is running in;
|
|
# the trace function is threadlocal
|
|
assert get_thread_ident() == hub.thread_ident
|
|
self._greenlet_tracer = GreenletTracer()
|
|
|
|
self._monitoring_functions = [_MonitorEntry(self.monitor_blocking,
|
|
GEVENT_CONFIG.max_blocking_time)]
|
|
self._calculated_sleep_time = GEVENT_CONFIG.max_blocking_time
|
|
# Create the actual monitoring thread. This is effectively a "daemon"
|
|
# thread.
|
|
self.monitor_thread_ident = start_new_thread(self, ())
|
|
|
|
# We must track the PID to know if your thread has died after a fork
|
|
self.pid = os.getpid()
|
|
|
|
def _on_fork(self):
|
|
# Pseudo-standard method that resolver_ares and threadpool
|
|
# also have, called by hub.reinit()
|
|
pid = os.getpid()
|
|
if pid != self.pid:
|
|
self.pid = pid
|
|
self.monitor_thread_ident = start_new_thread(self, ())
|
|
|
|
@property
|
|
def hub(self):
|
|
return self._hub_wref()
|
|
|
|
|
|
def monitoring_functions(self):
|
|
# Return a list of _MonitorEntry objects
|
|
|
|
# Update max_blocking_time each time.
|
|
mbt = GEVENT_CONFIG.max_blocking_time # XXX: Events so we know when this changes.
|
|
if mbt != self._monitoring_functions[0].period:
|
|
self._monitoring_functions[0].period = mbt
|
|
self._calculated_sleep_time = min(x.period for x in self._monitoring_functions)
|
|
return self._monitoring_functions
|
|
|
|
def add_monitoring_function(self, function, period):
|
|
if not callable(function):
|
|
raise ValueError("function must be callable")
|
|
|
|
if period is None:
|
|
# Remove.
|
|
self._monitoring_functions = [
|
|
x for x in self._monitoring_functions
|
|
if x.function != function
|
|
]
|
|
elif period <= 0:
|
|
raise ValueError("Period must be positive.")
|
|
else:
|
|
# Add or update period
|
|
entry = _MonitorEntry(function, period)
|
|
self._monitoring_functions = [
|
|
x if x.function != function else entry
|
|
for x in self._monitoring_functions
|
|
]
|
|
if entry not in self._monitoring_functions:
|
|
self._monitoring_functions.append(entry)
|
|
self._calculated_sleep_time = min(x.period for x in self._monitoring_functions)
|
|
|
|
def calculate_sleep_time(self):
|
|
min_sleep = self._calculated_sleep_time
|
|
if min_sleep <= 0:
|
|
# Everyone wants to be disabled. Sleep for a longer period of
|
|
# time than usual so we don't spin unnecessarily. We might be
|
|
# enabled again in the future.
|
|
return self.inactive_sleep_time
|
|
return max((min_sleep, self.min_sleep_time))
|
|
|
|
def kill(self):
|
|
if not self.should_run:
|
|
# Prevent overwriting trace functions.
|
|
return
|
|
# Stop this monitoring thread from running.
|
|
self.should_run = False
|
|
# Uninstall our tracing hook
|
|
self._greenlet_tracer.kill()
|
|
|
|
def _on_hub_gc(self, _):
|
|
self.kill()
|
|
|
|
def __call__(self):
|
|
# The function that runs in the monitoring thread.
|
|
# We cannot use threading.current_thread because it would
|
|
# create an immortal DummyThread object.
|
|
getcurrent().gevent_monitoring_thread = wref(self)
|
|
|
|
try:
|
|
while self.should_run:
|
|
functions = self.monitoring_functions()
|
|
assert functions
|
|
sleep_time = self.calculate_sleep_time()
|
|
|
|
thread_sleep(sleep_time)
|
|
|
|
# Make sure the hub is still around, and still active,
|
|
# and keep it around while we are here.
|
|
hub = self.hub
|
|
if not hub:
|
|
self.kill()
|
|
|
|
if self.should_run:
|
|
this_run = perf_counter()
|
|
for entry in functions:
|
|
f = entry.function
|
|
period = entry.period
|
|
last_run = entry.last_run_time
|
|
if period and last_run + period <= this_run:
|
|
entry.last_run_time = this_run
|
|
f(hub)
|
|
del hub # break our reference to hub while we sleep
|
|
|
|
except SystemExit:
|
|
pass
|
|
except: # pylint:disable=bare-except
|
|
# We're a daemon thread, so swallow any exceptions that get here
|
|
# during interpreter shutdown.
|
|
if not sys or not sys.stderr: # pragma: no cover
|
|
# Interpreter is shutting down
|
|
pass
|
|
else:
|
|
hub = self.hub
|
|
if hub is not None:
|
|
# XXX: This tends to do bad things like end the process, because we
|
|
# try to switch *threads*, which can't happen. Need something better.
|
|
hub.handle_error(self, *sys.exc_info())
|
|
|
|
def monitor_blocking(self, hub):
|
|
# Called periodically to see if the trace function has
|
|
# fired to switch greenlets. If not, we will print
|
|
# the greenlet tree.
|
|
|
|
# For tests, we return a true value when we think we found something
|
|
# blocking
|
|
|
|
did_block = self._greenlet_tracer.did_block_hub(hub)
|
|
if not did_block:
|
|
return
|
|
|
|
active_greenlet = did_block[1]
|
|
report = self._greenlet_tracer.did_block_hub_report(
|
|
hub, active_greenlet,
|
|
dict(greenlet_stacks=False, current_thread_ident=self.monitor_thread_ident))
|
|
|
|
stream = hub.exception_stream
|
|
for line in report:
|
|
# Printing line by line may interleave with other things,
|
|
# but it should also prevent a "reentrant call to print"
|
|
# when the report is large.
|
|
print(line, file=stream)
|
|
|
|
notify(EventLoopBlocked(active_greenlet, GEVENT_CONFIG.max_blocking_time, report))
|
|
return (active_greenlet, report)
|
|
|
|
def ignore_current_greenlet_blocking(self):
|
|
self._greenlet_tracer.ignore_current_greenlet_blocking()
|
|
|
|
def monitor_current_greenlet_blocking(self):
|
|
self._greenlet_tracer.monitor_current_greenlet_blocking()
|
|
|
|
def _get_process(self): # pylint:disable=method-hidden
|
|
proc = get_this_psutil_process()
|
|
self._get_process = lambda: proc
|
|
return proc
|
|
|
|
def can_monitor_memory_usage(self):
|
|
return self._get_process() is not None
|
|
|
|
def install_monitor_memory_usage(self):
|
|
# Start monitoring memory usage, if possible.
|
|
# If not possible, emit a warning.
|
|
if not self.can_monitor_memory_usage():
|
|
import warnings
|
|
warnings.warn("Unable to monitor memory usage. Install psutil.",
|
|
MonitorWarning)
|
|
return
|
|
|
|
self.add_monitoring_function(self.monitor_memory_usage,
|
|
max(GEVENT_CONFIG.memory_monitor_period,
|
|
self.min_memory_monitor_period))
|
|
|
|
def monitor_memory_usage(self, _hub):
|
|
max_allowed = GEVENT_CONFIG.max_memory_usage
|
|
if not max_allowed:
|
|
# They disabled it.
|
|
return -1 # value for tests
|
|
|
|
rusage = self._get_process().memory_full_info()
|
|
# uss only documented available on Windows, Linux, and OS X.
|
|
# If not available, fall back to rss as an aproximation.
|
|
mem_usage = getattr(rusage, 'uss', 0) or rusage.rss
|
|
|
|
event = None # Return value for tests
|
|
|
|
if mem_usage > max_allowed:
|
|
if mem_usage > self._memory_exceeded:
|
|
# We're still growing
|
|
event = MemoryUsageThresholdExceeded(
|
|
mem_usage, max_allowed, rusage)
|
|
notify(event)
|
|
self._memory_exceeded = mem_usage
|
|
else:
|
|
# we're below. Were we above it last time?
|
|
if self._memory_exceeded:
|
|
event = MemoryUsageUnderThreshold(
|
|
mem_usage, max_allowed, rusage, self._memory_exceeded)
|
|
notify(event)
|
|
self._memory_exceeded = 0
|
|
|
|
return event
|
|
|
|
def __repr__(self):
|
|
return '<%s at %s in thread %s greenlet %r for %r>' % (
|
|
self.__class__.__name__,
|
|
hex(id(self)),
|
|
hex(self.monitor_thread_ident),
|
|
getcurrent(),
|
|
self._hub_wref())
|