# -*- coding: utf-8 -*-
# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright (C) 2015-2018 GEM Foundation
# OpenQuake is free software: you can redistribute it and/or modify it
# under the terms of the GNU Affero General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# OpenQuake is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU Affero General Public License
# along with OpenQuake. If not, see <http://www.gnu.org/licenses/>.
import os
import time
import psutil
from datetime import datetime
import numpy
from openquake.baselib.general import humansize
from openquake.baselib import hdf5
perf_dt = numpy.dtype([('operation', (bytes, 50)), ('time_sec', float),
('memory_mb', float), ('counts', int)])
def _pairs(items):
lst = []
for name, value in items:
if isinstance(value, dict):
for k, v in value.items():
lst.append(('%s.%s' % (name, k), repr(v)))
else:
lst.append((name, repr(value)))
return sorted(lst)
# this is not thread-safe
[docs]class Monitor(object):
"""
Measure the resident memory occupied by a list of processes during
the execution of a block of code. Should be used as a context manager,
as follows::
with Monitor('do_something') as mon:
do_something()
print mon.mem
At the end of the block the Monitor object will have the
following 5 public attributes:
.start_time: when the monitor started (a datetime object)
.duration: time elapsed between start and stop (in seconds)
.exc: usually None; otherwise the exception happened in the `with` block
.mem: the memory delta in bytes
The behaviour of the Monitor can be customized by subclassing it
and by overriding the method on_exit(), called at end and used to display
or store the results of the analysis.
NB: if the .address attribute is set, it is possible for the monitor to
send commands to that address, assuming there is a
:class:`multiprocessing.connection.Listener` listening.
"""
address = None
authkey = None
calc_id = None
def __init__(self, operation='', hdf5=None,
autoflush=False, measuremem=False):
self.operation = operation
self.hdf5 = hdf5
self.autoflush = autoflush
self.measuremem = measuremem
self.mem = 0
self.duration = 0
self._start_time = self._stop_time = time.time()
self.children = []
self.counts = 0
self.address = None
self._flush = True
@property
def dt(self):
"""Last time interval measured"""
return self._stop_time - self._start_time
[docs] def measure_mem(self):
"""A memory measurement (in bytes)"""
try:
return memory_rss(os.getpid())
except psutil.AccessDenied:
# no access to information about this process
pass
@property
def start_time(self):
"""
Datetime instance recording when the monitoring started
"""
return datetime.fromtimestamp(self._start_time)
[docs] def get_data(self):
"""
:returns:
an array of dtype perf_dt, with the information
of the monitor (operation, time_sec, memory_mb, counts);
the lenght of the array can be 0 (for counts=0) or 1 (otherwise).
"""
data = []
if self.counts:
time_sec = self.duration
memory_mb = self.mem / 1024. / 1024. if self.measuremem else 0
data.append((self.operation, time_sec, memory_mb, self.counts))
return numpy.array(data, perf_dt)
def __enter__(self):
self.exc = None # exception
self._start_time = time.time()
if self.measuremem:
self.start_mem = self.measure_mem()
return self
def __exit__(self, etype, exc, tb):
self.exc = exc
if self.measuremem:
self.stop_mem = self.measure_mem()
self.mem += self.stop_mem - self.start_mem
self._stop_time = time.time()
self.duration += self._stop_time - self._start_time
self.counts += 1
self.on_exit()
[docs] def on_exit(self):
"To be overridden in subclasses"
if self.autoflush:
self.flush()
[docs] def flush(self):
"""
Save the measurements on the performance file (or on stdout)
"""
if not self._flush:
raise RuntimeError(
'Monitor(%r).flush() must not be called in a worker' %
self.operation)
for child in self.children:
child.hdf5 = self.hdf5
child.flush()
data = self.get_data()
if len(data) == 0: # no information
return []
elif self.hdf5:
hdf5.extend(self.hdf5['performance_data'], data)
# reset monitor
self.duration = 0
self.mem = 0
self.counts = 0
return data
# TODO: rename this as spawn; see what will break
def __call__(self, operation='no operation', **kw):
"""
Return a child of the monitor usable for a different operation.
"""
child = self.new(operation, **kw)
self.children.append(child)
return child
[docs] def new(self, operation='no operation', **kw):
"""
Return a copy of the monitor usable for a different operation.
"""
self_vars = vars(self).copy()
del self_vars['operation']
del self_vars['children']
del self_vars['counts']
del self_vars['_flush']
new = self.__class__(operation)
vars(new).update(self_vars)
vars(new).update(kw)
return new
def __repr__(self):
calc_id = ' #%s ' % self.calc_id if self.calc_id else ' '
msg = '%s%s%s' % (self.__class__.__name__, calc_id, self.operation)
if self.measuremem:
return '<%s, duration=%ss, memory=%s>' % (
msg, self.duration, humansize(self.mem))
elif self.duration:
return '<%s, duration=%ss>' % (msg, self.duration)
else:
return '<%s>' % msg