/usr/share/pyshared/meliae/perf_counter.py is in python-meliae 0.4.0-1build1.
This file is owned by root:root, with mode 0o644.
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#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3 as
# published by the Free Software Foundation.
#
# This program 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 General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""Get information from the OS about current memory usage"""
import ctypes
import math
import re
import sys
import time
class _Counter(object):
"""Track various aspects of performance for a given action."""
def __init__(self, name, timer):
self.name = name
self.time_spent = 0.0
self._time_spent_squared = 0.0
self.count = 0
self._time_start = None
self._timer = timer
def tick(self):
"""Indicate that we are starting a section related to this counter."""
self._time_start = self._timer()
def tock(self):
"""Indicate that we finished processing."""
if self._time_start is not None:
now = self._timer()
delta = now - self._time_start
self.time_spent += delta
self._time_spent_squared += (delta * delta)
self._time_start = None
self.count += 1
def time_stddev(self):
# This uses a simple transformation on stddev to allow us to store 2
# numbers and compute the standard deviation, rather than needing a
# list of times.
# stddev = sqrt(mean(x^2) - mean(x)^2)
if self.count == 0:
return 0
diff = (self._time_spent_squared - (self.time_spent*self.time_spent))
if self.count == 1:
return math.sqrt(diff)
return math.sqrt(diff / (self.count-1))
class PerformanceCounter(object):
"""Abstract some system information about performance counters.
This includes both memory and timing.
"""
def __init__(self):
self._counters = {}
def reset(self):
self._counters.clear()
def get_counter(self, name):
"""Create a Counter object that will track some aspect of processing.
:param name: An identifier associated with this action.
:return: A Counter instance.
"""
try:
c = self._counters[name]
except KeyError:
c = _Counter(name, self.get_timer())
self._counters[name] = c
return c
def get_memory(self, process):
"""Ask the OS for the peak memory consumption at this point in time.
:param process: is a subprocess.Popen object.
:return: (current, peak) the memory used in bytes.
"""
raise NotImplementedError(self.get_memory)
class _LinuxPerformanceCounter(PerformanceCounter):
def get_timer(self):
# This returns wall-clock time
return time.time
def get_memory(self, process):
pid = process.pid
try:
f = open('/proc/%s/status' % (process.pid,), 'rb')
except (IOError, OSError):
return None, None
try:
content = f.read()
finally:
f.close()
m = re.search(r'(?i)vmpeak:\s*(?P<peak>\d+) kB', content)
peak = current = None
if m is not None:
peak = int(m.group('peak')) * 1024
m = re.search(r'(?i)vmsize:\s*(?P<current>\d+) kB', content)
if m is not None:
current = int(m.group('current')) * 1024
return current, peak
class _Win32PerformanceCounter(PerformanceCounter):
def get_timer(self):
# This returns wall-clock time, but using a much higher precision than
# time.time() [which has a resolution of only 15ms]
return time.clock
def _get_memory_win32(self, process_handle):
"""Get the current memory consumption using win32 apis."""
mem_struct = PROCESS_MEMORY_COUNTERS_EX()
ret = ctypes.windll.psapi.GetProcessMemoryInfo(process_handle,
ctypes.byref(mem_struct),
ctypes.sizeof(mem_struct))
if not ret:
raise RuntimeError('Failed to call GetProcessMemoryInfo: %s'
% ctypes.FormatError())
return {
'PageFaultCount': mem_struct.PageFaultCount,
'PeakWorkingSetSize': mem_struct.PeakWorkingSetSize,
'WorkingSetSize': mem_struct.WorkingSetSize,
'QuotaPeakPagedPoolUsage': mem_struct.QuotaPeakPagedPoolUsage,
'QuotaPagedPoolUsage': mem_struct.QuotaPagedPoolUsage,
'QuotaPeakNonPagedPoolUsage': mem_struct.QuotaPeakNonPagedPoolUsage,
'QuotaNonPagedPoolUsage': mem_struct.QuotaNonPagedPoolUsage,
'PagefileUsage': mem_struct.PagefileUsage,
'PeakPagefileUsage': mem_struct.PeakPagefileUsage,
'PrivateUsage': mem_struct.PrivateUsage,
}
def get_memory(self, process):
"""See PerformanceCounter.get_memory()"""
process_handle = int(process._handle)
mem = self._get_memory_win32(process_handle)
return mem['WorkingSetSize'], mem['PeakWorkingSetSize']
# what to do about darwin, freebsd, etc?
if sys.platform == 'win32':
perf_counter = _Win32PerformanceCounter()
# Define this here so we don't have to re-define it on every function call
class PROCESS_MEMORY_COUNTERS_EX(ctypes.Structure):
"""Used by GetProcessMemoryInfo"""
_fields_ = [('cb', ctypes.c_ulong),
('PageFaultCount', ctypes.c_ulong),
('PeakWorkingSetSize', ctypes.c_size_t),
('WorkingSetSize', ctypes.c_size_t),
('QuotaPeakPagedPoolUsage', ctypes.c_size_t),
('QuotaPagedPoolUsage', ctypes.c_size_t),
('QuotaPeakNonPagedPoolUsage', ctypes.c_size_t),
('QuotaNonPagedPoolUsage', ctypes.c_size_t),
('PagefileUsage', ctypes.c_size_t),
('PeakPagefileUsage', ctypes.c_size_t),
('PrivateUsage', ctypes.c_size_t),
]
else:
perf_counter = _LinuxPerformanceCounter()
def _get_process_win32():
"""Similar to getpid() but returns an OS handle."""
return ctypes.windll.kernel32.GetCurrentProcess()
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