/usr/lib/python2.7/dist-packages/meliae/perf_counter.py is in python-meliae 0.4.0+bzr199-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 | # Copyright (C) 2009, 2010 Canonical Ltd
#
# 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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