annotate MoinMoin/util/profile.py @ 6025:05a6897ee496

"userdir" caching scope: use it for userid lookup caches, reduce code duplication For same reasons (see previous changesets), we need to use the "userdir" scope for the name2id / openid2id lookup caches, too.
author Thomas Waldmann <tw AT waldmann-edv DOT de>
date Wed, 12 Feb 2014 12:07:22 +0100
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children
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1 """ profile - moin profiling utilities
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3 This module provides profilers used to profile the memory usage of a
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4 long running process.
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5
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6 Typical usage:
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7
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8 1. Create a profiler:
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10 from MoinMoin.util.profile import Profiler
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11 profiler = Profiler('my log')
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13 2. In the request handler, add each request to the profiler:
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15 profiler.addRequest()
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16
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17 3. If you like, you can add extra samples:
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19 profiler.sample()
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20
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21 You can customize the profiler when you create it:
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22
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23 * requestsPerSample (default 100):
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25 How many requests to run between samples. Set higher for live wiki or
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26 lower for more accurate results.
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28 * collect (default 0):
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30 Use gc.collect to force a memory cleanup each sample. Keeps the
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31 memory usage much lower, but your profile data will not reflect the
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32 real world memory usage of the application.
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33
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34 Based on code by Oliver Graf
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35
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36 @copyright: 2004 Nir Soffer
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37 @license: GNU GPL, see COPYING for details.
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38 """
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39
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40 import os, time, gc
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42
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43 class Profiler:
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44 """ Profile memory usage
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45
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46 Profiler count requests and sample memory usage.
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47
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48 FIXME: We might want to save the profiler log in the profiled wiki
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49 data dir, but the data dir is available only later in request. This
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50 should be fixed by loading the config earlier.
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51 """
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52 def __init__(self, name, requestsPerSample=100, collect=0):
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53 """ Initialize a profiler
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54
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55 @param name: profiler name, used in the log file name
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56 @param requestsPerSample: how many request to run between samples
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57 @param collect: should call gc.collect() in each sample
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58 """
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59 logname = '%s--%s.log' % (name, time.strftime('%Y-%m-%d--%H-%M'))
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60 self.logfile = file(logname, 'a')
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61 self.requestsPerSample = requestsPerSample
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62 self.collect = collect
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63 self.pid = os.getpid()
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64 self.count = 0 # count between somples
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65 self.requests = 0 # requests added
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66 self.data = {'collect': 'NA'} # Sample data
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67
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68 def addRequest(self):
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69 """ Add a request to the profile
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70
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71 Call this for each page request.
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72
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73 WARNING: This is the most important call. if you don't call this
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74 for each request - you will not have any profile data.
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75
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76 Invoke sample when self.count reach self.requestsPerSample.
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77 """
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78 self.requests += 1
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79 self.count += 1
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80 if self.count == self.requestsPerSample:
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81 # Time for a sample
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82 self.count = 0
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83 self.sample()
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84
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85 def sample(self):
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86 """ Make a sample of memory usage and log it
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87
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88 You can call this to make samples between the samples done each
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89 requestsPerSample, for example, at startup.
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90
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91 Invoke common methods for all profilers. Some profilers like
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92 TwistedProfiler override this method.
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93 """
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94 self._setData()
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95 self._setMemory()
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96 self._log()
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97
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98 # Private methods ------------------------------------------------------
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99
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100 def _setData(self):
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101 """ Collect sample data into self.data
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102
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103 Private method used by profilers.
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104 """
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105 d = self.data
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106 d['date'] = time.strftime('%Y-%m-%d %H:%M:%S')
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107 d['requests'] = self.requests
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108 if self.collect:
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109 d['collect'] = str(gc.collect())
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110 d['objects'] = len(gc.get_objects())
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111 d['garbage'] = len(gc.garbage)
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112
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113 def _setMemory(self):
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114 """ Get process memory usage
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115
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116 Private method used by profilers.
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117
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118 Uses ps call, maybe we should use procfs on Linux or maybe
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119 getrusage system call (using the ctypes module).
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120 """
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121 lines = os.popen('/bin/ps -p %s -o rss' % self.pid).readlines()
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122 self.data['memory'] = lines[1].strip()
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123
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124 def _log(self):
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125 """ Format sample and write to log
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126
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127 Private method used by profilers.
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128 """
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129 line = ('%(date)s req:%(requests)d mem:%(memory)sKB collect:%(collect)s '
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130 'objects:%(objects)d garbage:%(garbage)d\n' % self.data)
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131 self.logfile.write(line)
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132 self.logfile.flush()
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133
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134
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135 class TwistedProfiler(Profiler):
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136 """ Twisted specific memory profiler
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137
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138 Customize the way we call ps, to overcome blocking problems on
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139 twisted.
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140 """
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141
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142 def __init__(self, name, requestsPerSample=100, collect=0):
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143 """ Initialized twisted profiler
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144
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145 Invoke Profiler.__init__ and import getProcessOuput from
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146 twisted.
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147 """
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148 Profiler.__init__(self, name, requestsPerSample, collect)
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149 from twisted.internet.utils import getProcessOutput
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150 self._getProcessOutput = getProcessOutput
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151
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152 def sample(self):
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153 """ Make a sample of memory usage and log it
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154
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155 On twisted we can't just call ps - we have to use deferred,
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156 which will call us using a callback when its finished, and then
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157 we log.
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158
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159 Since twisted continue to serve while the deferred fetch the
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160 memory, the reading may be late in few requests.
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161 """
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162 self._setData()
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163 # Memory will be available little later
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164 deferred = self._getProcessOutput('/bin/ps',
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165 ('-p', str(self.pid), '-o', 'rss'))
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166 deferred.addCallback(self._callback)
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167
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168 # Private methods ------------------------------------------------------
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169
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170 def _callback(self, data):
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171 """ Called from deferred when ps output is available
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172
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173 Private method, don't call this.
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174 """
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175 self.data['memory'] = data.split('\n')[1].strip()
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176 self._log()
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177
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178
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179 if __name__ == '__main__':
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180 # In case someone try to run as a script
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181 print __doc__
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182