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annotate piecrust/workerpool.py @ 451:838f3964f400

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bake: Optimize the bake by not using custom classes for passing info. See previous changeset about pickling performance between processes. Now just use plain standard structures, or the new `fastpickle` when needed.
author Ludovic Chabant <ludovic@chabant.com>
date Mon, 06 Jul 2015 21:30:49 -0700
parents aefe70229fdd
children 8351a77e13f5
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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447
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
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1 import os
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2 import sys
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3 import logging
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4 import threading
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5 import multiprocessing
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6 from piecrust.fastpickle import pickle, unpickle
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7
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8
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9 logger = logging.getLogger(__name__)
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10
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11
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12 class IWorker(object):
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13 def initialize(self):
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14 raise NotImplementedError()
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15
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16 def process(self, job):
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17 raise NotImplementedError()
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18
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19 def getReport(self):
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20 return None
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21
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22
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23 TASK_JOB = 0
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24 TASK_END = 1
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25
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26
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27 def worker_func(params):
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28 if params.is_profiling:
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29 try:
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30 import cProfile as profile
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31 except ImportError:
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32 import profile
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33
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34 params.is_profiling = False
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35 name = params.worker_class.__name__
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36 profile.runctx('_real_worker_func(params)',
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37 globals(), locals(),
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38 filename='%s-%d.prof' % (name, params.wid))
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39 else:
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40 _real_worker_func(params)
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41
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42
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43 def _real_worker_func(params):
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44 if hasattr(params.inqueue, '_writer'):
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45 params.inqueue._writer.close()
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46 params.outqueue._reader.close()
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47
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48 wid = params.wid
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49 logger.debug("Worker %d initializing..." % wid)
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50
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51 w = params.worker_class(*params.initargs)
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52 w.wid = wid
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53 w.initialize()
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54
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55 get = params.inqueue.get
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56 put = params.outqueue.put
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57
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58 completed = 0
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59 while True:
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60 try:
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61 task = get()
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62 except (EOFError, OSError):
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63 logger.debug("Worker %d encountered connection problem." % wid)
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64 break
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65
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66 task_type, task_data = task
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67 if task_type == TASK_END:
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68 logger.debug("Worker %d got end task, exiting." % wid)
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69 try:
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70 rep = (task_type, True, wid, (wid, w.getReport()))
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71 except Exception as e:
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72 if params.wrap_exception:
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73 e = multiprocessing.ExceptionWithTraceback(
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74 e, e.__traceback__)
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75 rep = (task_type, False, wid, (wid, e))
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76 put(rep)
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77 break
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78
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79 task_data = unpickle(task_data)
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80 try:
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81 res = (task_type, True, wid, w.process(task_data))
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82 except Exception as e:
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83 if params.wrap_exception:
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84 e = multiprocessing.ExceptionWithTraceback(e, e.__traceback__)
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85 res = (task_type, False, wid, e)
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86 put(res)
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87
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88 completed += 1
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89
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90 logger.debug("Worker %d completed %d tasks." % (wid, completed))
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91
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92
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93 class _WorkerParams(object):
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94 def __init__(self, wid, inqueue, outqueue, worker_class, initargs=(),
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95 wrap_exception=False, is_profiling=False):
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96 self.wid = wid
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97 self.inqueue = inqueue
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98 self.outqueue = outqueue
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99 self.worker_class = worker_class
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100 self.initargs = initargs
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101 self.wrap_exception = wrap_exception
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102 self.is_profiling = is_profiling
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103
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104
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105 class WorkerPool(object):
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106 def __init__(self, worker_class, worker_count=None, initargs=(),
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107 wrap_exception=False):
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108 worker_count = worker_count or os.cpu_count() or 1
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109
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110 self._task_queue = multiprocessing.SimpleQueue()
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111 self._result_queue = multiprocessing.SimpleQueue()
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112 self._quick_put = self._task_queue._writer.send
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113 self._quick_get = self._result_queue._reader.recv
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114
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115 self._callback = None
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116 self._error_callback = None
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117 self._listener = None
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118
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119 main_module = sys.modules['__main__']
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120 is_profiling = os.path.basename(main_module.__file__) in [
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121 'profile.py', 'cProfile.py']
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122
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123 self._pool = []
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124 for i in range(worker_count):
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125 worker_params = _WorkerParams(
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126 i, self._task_queue, self._result_queue,
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127 worker_class, initargs,
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128 wrap_exception=wrap_exception,
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129 is_profiling=is_profiling)
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130 w = multiprocessing.Process(target=worker_func,
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131 args=(worker_params,))
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132 w.name = w.name.replace('Process', 'PoolWorker')
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133 w.daemon = True
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134 w.start()
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135 self._pool.append(w)
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136
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137 self._result_handler = threading.Thread(
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parents:
diff changeset
138 target=WorkerPool._handleResults,
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parents:
diff changeset
139 args=(self,))
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parents:
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140 self._result_handler.daemon = True
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
141 self._result_handler.start()
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parents:
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142
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143 self._closed = False
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144
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145 def setHandler(self, callback=None, error_callback=None):
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146 self._callback = callback
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147 self._error_callback = error_callback
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148
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149 def queueJobs(self, jobs, handler=None):
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150 if self._closed:
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parents:
diff changeset
151 raise Exception("This worker pool has been closed.")
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parents:
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152 if self._listener is not None:
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153 raise Exception("A previous job queue has not finished yet.")
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154
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155 if handler is not None:
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parents:
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156 self.setHandler(handler)
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157
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158 if not hasattr(jobs, '__len__'):
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159 jobs = list(jobs)
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160
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161 res = AsyncResult(self, len(jobs))
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parents:
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162 if res._count == 0:
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163 res._event.set()
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164 return res
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165
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166 self._listener = res
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167 for job in jobs:
451
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parents: 447
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168 job_data = pickle(job)
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169 self._quick_put((TASK_JOB, job_data))
447
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170
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171 return res
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172
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173 def close(self):
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174 if self._listener is not None:
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175 raise Exception("A previous job queue has not finished yet.")
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176
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177 logger.debug("Closing worker pool...")
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178 handler = _ReportHandler(len(self._pool))
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179 self._callback = handler._handle
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180 for w in self._pool:
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181 self._quick_put((TASK_END, None))
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182 for w in self._pool:
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183 w.join()
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184
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185 logger.debug("Waiting for reports...")
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186 if not handler.wait(2):
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187 missing = handler.reports.index(None)
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188 logger.warning(
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Ludovic Chabant <ludovic@chabant.com>
parents:
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189 "Didn't receive all worker reports before timeout. "
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
190 "Missing report from worker %d." % missing)
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
191
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192 logger.debug("Exiting result handler thread...")
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Ludovic Chabant <ludovic@chabant.com>
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193 self._result_queue.put(None)
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parents:
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194 self._result_handler.join()
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Ludovic Chabant <ludovic@chabant.com>
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195 self._closed = True
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196
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197 return handler.reports
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198
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199 @staticmethod
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Ludovic Chabant <ludovic@chabant.com>
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200 def _handleResults(pool):
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parents:
diff changeset
201 while True:
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
202 try:
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Ludovic Chabant <ludovic@chabant.com>
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203 res = pool._quick_get()
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
204 except (EOFError, OSError):
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Ludovic Chabant <ludovic@chabant.com>
parents:
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205 logger.debug("Result handler thread encountered connection "
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
206 "problem, exiting.")
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
207 return
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parents:
diff changeset
208
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209 if res is None:
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
210 logger.debug("Result handler exiting.")
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
211 break
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
212
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parents:
diff changeset
213 task_type, success, wid, data = res
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
214 try:
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
215 if success and pool._callback:
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
216 pool._callback(data)
451
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Ludovic Chabant <ludovic@chabant.com>
parents: 447
diff changeset
217 elif not success:
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Ludovic Chabant <ludovic@chabant.com>
parents: 447
diff changeset
218 if pool._error_callback:
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Ludovic Chabant <ludovic@chabant.com>
parents: 447
diff changeset
219 pool._error_callback(data)
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Ludovic Chabant <ludovic@chabant.com>
parents: 447
diff changeset
220 else:
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Ludovic Chabant <ludovic@chabant.com>
parents: 447
diff changeset
221 logger.error(data)
447
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
222 except Exception as ex:
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
223 logger.exception(ex)
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
224
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
225 if task_type == TASK_JOB:
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
226 pool._listener._onTaskDone()
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
227
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parents:
diff changeset
228
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
229 class AsyncResult(object):
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Ludovic Chabant <ludovic@chabant.com>
parents:
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230 def __init__(self, pool, count):
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
231 self._pool = pool
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
232 self._count = count
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
233 self._event = threading.Event()
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
234
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
235 def ready(self):
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
236 return self._event.is_set()
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
237
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
238 def wait(self, timeout=None):
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
239 return self._event.wait(timeout)
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
240
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
241 def _onTaskDone(self):
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
242 self._count -= 1
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
243 if self._count == 0:
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
244 self._pool.setHandler(None)
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
245 self._pool._listener = None
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
246 self._event.set()
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
247
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Ludovic Chabant <ludovic@chabant.com>
parents:
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248
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
249 class _ReportHandler(object):
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
250 def __init__(self, worker_count):
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
251 self.reports = [None] * worker_count
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
252 self._count = worker_count
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
253 self._received = 0
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
254 self._event = threading.Event()
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
255
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
256 def wait(self, timeout=None):
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
257 return self._event.wait(timeout)
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
258
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
259 def _handle(self, res):
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
260 wid, data = res
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
261 if wid < 0 or wid > self._count:
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
262 logger.error("Ignoring report from unknown worker %d." % wid)
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
263 return
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
264
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
265 self._received += 1
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
266 self.reports[wid] = data
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
267
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
268 if self._received == self._count:
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
269 self._event.set()
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
270
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
271 def _handleError(self, res):
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
272 wid, data = res
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
273 logger.error("Worker %d failed to send its report." % wid)
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
274 logger.exception(data)
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
275