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annotate piecrust/workerpool.py @ 562:fd8bd08d1fa8

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docs: Add reference entry about the `site/slugify_mode` setting.
author Ludovic Chabant <ludovic@chabant.com>
date Fri, 14 Aug 2015 22:55:36 -0700
parents 22a230d99621
children 8073ae8cb164
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aefe70229fdd bake: Commonize worker pool code between html and asset baking.
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1 import os
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2 import sys
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3 import zlib
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4 import logging
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5 import itertools
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6 import threading
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7 import multiprocessing
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8 from piecrust.fastpickle import pickle, unpickle
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9
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10
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11 logger = logging.getLogger(__name__)
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12
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13
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14 class IWorker(object):
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15 def initialize(self):
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16 raise NotImplementedError()
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17
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18 def process(self, job):
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19 raise NotImplementedError()
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20
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21 def getReport(self):
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22 return None
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23
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24
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25 TASK_JOB = 0
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26 TASK_BATCH = 1
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27 TASK_END = 2
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28
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29
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30 def worker_func(params):
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31 if params.is_profiling:
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32 try:
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33 import cProfile as profile
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34 except ImportError:
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35 import profile
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36
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37 params.is_profiling = False
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38 name = params.worker_class.__name__
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39 profile.runctx('_real_worker_func(params)',
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40 globals(), locals(),
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41 filename='%s-%d.prof' % (name, params.wid))
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42 else:
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43 _real_worker_func(params)
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44
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45
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46 def _real_worker_func(params):
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47 # In a context where `multiprocessing` is using the `spawn` forking model,
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48 # the new process doesn't inherit anything, so we lost all our logging
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49 # configuration here. Let's set it up again.
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50 from piecrust.main import _pre_parse_chef_args
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51 _pre_parse_chef_args(sys.argv[1:])
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52
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53 wid = params.wid
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54 logger.debug("Worker %d initializing..." % wid)
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55
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56 params.inqueue._writer.close()
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57 params.outqueue._reader.close()
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58
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59 w = params.worker_class(*params.initargs)
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60 w.wid = wid
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61 try:
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62 w.initialize()
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63 except Exception as ex:
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64 logger.error("Working failed to initialize:")
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65 logger.exception(ex)
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66 params.outqueue.put(None)
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67 return
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68
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69 get = params.inqueue.get
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70 put = params.outqueue.put
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71
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72 completed = 0
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73 while True:
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74 try:
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75 task = get()
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76 except (EOFError, OSError):
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77 logger.debug("Worker %d encountered connection problem." % wid)
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78 break
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79
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80 task_type, task_data = task
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81 if task_type == TASK_END:
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82 logger.debug("Worker %d got end task, exiting." % wid)
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83 try:
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84 rep = (task_type, True, wid, (wid, w.getReport()))
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85 except Exception as e:
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86 if params.wrap_exception:
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87 e = multiprocessing.ExceptionWithTraceback(
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88 e, e.__traceback__)
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89 rep = (task_type, False, wid, (wid, e))
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90 put(rep)
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91 break
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92
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93 if task_type == TASK_JOB:
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94 task_data = (task_data,)
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95
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96 for t in task_data:
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97 try:
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98 res = (TASK_JOB, True, wid, w.process(t))
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99 except Exception as e:
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100 if params.wrap_exception:
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101 e = multiprocessing.ExceptionWithTraceback(
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102 e, e.__traceback__)
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103 res = (TASK_JOB, False, wid, e)
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104 put(res)
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105
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106 completed += 1
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107
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108 logger.debug("Worker %d completed %d tasks." % (wid, completed))
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109
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110
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111 class _WorkerParams(object):
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112 def __init__(self, wid, inqueue, outqueue, worker_class, initargs=(),
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113 wrap_exception=False, is_profiling=False):
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114 self.wid = wid
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115 self.inqueue = inqueue
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116 self.outqueue = outqueue
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117 self.worker_class = worker_class
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118 self.initargs = initargs
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119 self.wrap_exception = wrap_exception
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120 self.is_profiling = is_profiling
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121
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122
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123 class WorkerPool(object):
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124 def __init__(self, worker_class, initargs=(),
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125 worker_count=None, batch_size=None,
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126 wrap_exception=False):
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127 worker_count = worker_count or os.cpu_count() or 1
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128
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129 use_fastqueue = True
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130 if use_fastqueue:
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131 self._task_queue = FastQueue()
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132 self._result_queue = FastQueue()
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133 self._quick_put = self._task_queue.put
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134 self._quick_get = self._result_queue.get
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135 else:
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diff changeset
136 self._task_queue = multiprocessing.SimpleQueue()
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137 self._result_queue = multiprocessing.SimpleQueue()
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diff changeset
138 self._quick_put = self._task_queue._writer.send
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139 self._quick_get = self._result_queue._reader.recv
447
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140
462
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diff changeset
141 self._batch_size = batch_size
447
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142 self._callback = None
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diff changeset
143 self._error_callback = None
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144 self._listener = None
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145
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146 main_module = sys.modules['__main__']
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147 is_profiling = os.path.basename(main_module.__file__) in [
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148 'profile.py', 'cProfile.py']
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149
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150 self._pool = []
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151 for i in range(worker_count):
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152 worker_params = _WorkerParams(
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diff changeset
153 i, self._task_queue, self._result_queue,
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154 worker_class, initargs,
451
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diff changeset
155 wrap_exception=wrap_exception,
447
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156 is_profiling=is_profiling)
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157 w = multiprocessing.Process(target=worker_func,
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158 args=(worker_params,))
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159 w.name = w.name.replace('Process', 'PoolWorker')
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160 w.daemon = True
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161 w.start()
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162 self._pool.append(w)
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163
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164 self._result_handler = threading.Thread(
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165 target=WorkerPool._handleResults,
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166 args=(self,))
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167 self._result_handler.daemon = True
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168 self._result_handler.start()
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169
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170 self._closed = False
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171
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172 def setHandler(self, callback=None, error_callback=None):
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173 self._callback = callback
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174 self._error_callback = error_callback
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175
460
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176 def queueJobs(self, jobs, handler=None, chunk_size=None):
447
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177 if self._closed:
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178 raise Exception("This worker pool has been closed.")
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179 if self._listener is not None:
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180 raise Exception("A previous job queue has not finished yet.")
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181
453
8351a77e13f5 bake: Don't pass the previous record entries to the workers.
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diff changeset
182 if any([not p.is_alive() for p in self._pool]):
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parents: 451
diff changeset
183 raise Exception("Some workers have prematurely exited.")
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diff changeset
184
447
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185 if handler is not None:
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186 self.setHandler(handler)
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187
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188 if not hasattr(jobs, '__len__'):
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189 jobs = list(jobs)
460
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diff changeset
190 job_count = len(jobs)
447
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parents:
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191
460
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diff changeset
192 res = AsyncResult(self, job_count)
447
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parents:
diff changeset
193 if res._count == 0:
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diff changeset
194 res._event.set()
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parents:
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195 return res
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parents:
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196
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197 self._listener = res
460
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diff changeset
198
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parents: 453
diff changeset
199 if chunk_size is None:
462
04abc97dd3b6 bake: Add CLI argument to specify job batch size.
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parents: 461
diff changeset
200 chunk_size = self._batch_size
04abc97dd3b6 bake: Add CLI argument to specify job batch size.
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parents: 461
diff changeset
201 if chunk_size is None:
460
55fc8918cb75 bake: Use batched jobs in the worker pool.
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parents: 453
diff changeset
202 chunk_size = max(1, job_count // 50)
55fc8918cb75 bake: Use batched jobs in the worker pool.
Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
203 logger.debug("Using chunk size of %d" % chunk_size)
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parents: 453
diff changeset
204
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parents: 453
diff changeset
205 if chunk_size is None or chunk_size == 1:
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Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
206 for job in jobs:
461
b015e38d4ee1 internal: Handle data serialization more under the hood.
Ludovic Chabant <ludovic@chabant.com>
parents: 460
diff changeset
207 self._quick_put((TASK_JOB, job))
460
55fc8918cb75 bake: Use batched jobs in the worker pool.
Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
208 else:
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Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
209 it = iter(jobs)
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Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
210 while True:
461
b015e38d4ee1 internal: Handle data serialization more under the hood.
Ludovic Chabant <ludovic@chabant.com>
parents: 460
diff changeset
211 batch = tuple([i for i in itertools.islice(it, chunk_size)])
460
55fc8918cb75 bake: Use batched jobs in the worker pool.
Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
212 if not batch:
55fc8918cb75 bake: Use batched jobs in the worker pool.
Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
213 break
55fc8918cb75 bake: Use batched jobs in the worker pool.
Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
214 self._quick_put((TASK_BATCH, batch))
447
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parents:
diff changeset
215
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parents:
diff changeset
216 return res
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
217
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
218 def close(self):
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
219 if self._listener is not None:
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
220 raise Exception("A previous job queue has not finished yet.")
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
221
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
222 logger.debug("Closing worker pool...")
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
223 handler = _ReportHandler(len(self._pool))
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
224 self._callback = handler._handle
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
225 for w in self._pool:
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
226 self._quick_put((TASK_END, None))
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
227 for w in self._pool:
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
228 w.join()
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
229
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
230 logger.debug("Waiting for reports...")
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
231 if not handler.wait(2):
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
232 missing = handler.reports.index(None)
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
233 logger.warning(
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
234 "Didn't receive all worker reports before timeout. "
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
235 "Missing report from worker %d." % missing)
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
236
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
237 logger.debug("Exiting result handler thread...")
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
238 self._result_queue.put(None)
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
239 self._result_handler.join()
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
240 self._closed = True
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parents:
diff changeset
241
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
242 return handler.reports
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
243
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
244 @staticmethod
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
245 def _handleResults(pool):
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parents:
diff changeset
246 while True:
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
247 try:
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
248 res = pool._quick_get()
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
249 except (EOFError, OSError):
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
250 logger.debug("Result handler thread encountered connection "
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
251 "problem, exiting.")
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
252 return
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
253
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
254 if res is None:
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
255 logger.debug("Result handler exiting.")
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
256 break
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
257
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
258 task_type, success, wid, data = res
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
259 try:
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
260 if success and pool._callback:
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
261 pool._callback(data)
451
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Ludovic Chabant <ludovic@chabant.com>
parents: 447
diff changeset
262 elif not success:
838f3964f400 bake: Optimize the bake by not using custom classes for passing info.
Ludovic Chabant <ludovic@chabant.com>
parents: 447
diff changeset
263 if pool._error_callback:
838f3964f400 bake: Optimize the bake by not using custom classes for passing info.
Ludovic Chabant <ludovic@chabant.com>
parents: 447
diff changeset
264 pool._error_callback(data)
838f3964f400 bake: Optimize the bake by not using custom classes for passing info.
Ludovic Chabant <ludovic@chabant.com>
parents: 447
diff changeset
265 else:
838f3964f400 bake: Optimize the bake by not using custom classes for passing info.
Ludovic Chabant <ludovic@chabant.com>
parents: 447
diff changeset
266 logger.error(data)
447
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
267 except Exception as ex:
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
268 logger.exception(ex)
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
269
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
270 if task_type == TASK_JOB:
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
271 pool._listener._onTaskDone()
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
272
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
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273
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274 class AsyncResult(object):
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275 def __init__(self, pool, count):
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276 self._pool = pool
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277 self._count = count
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278 self._event = threading.Event()
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279
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280 def ready(self):
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281 return self._event.is_set()
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282
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283 def wait(self, timeout=None):
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284 return self._event.wait(timeout)
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285
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286 def _onTaskDone(self):
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287 self._count -= 1
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288 if self._count == 0:
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289 self._pool.setHandler(None)
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290 self._pool._listener = None
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291 self._event.set()
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292
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293
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294 class _ReportHandler(object):
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295 def __init__(self, worker_count):
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296 self.reports = [None] * worker_count
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297 self._count = worker_count
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298 self._received = 0
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299 self._event = threading.Event()
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300
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301 def wait(self, timeout=None):
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302 return self._event.wait(timeout)
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303
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304 def _handle(self, res):
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305 wid, data = res
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306 if wid < 0 or wid > self._count:
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307 logger.error("Ignoring report from unknown worker %d." % wid)
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308 return
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309
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310 self._received += 1
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311 self.reports[wid] = data
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312
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313 if self._received == self._count:
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314 self._event.set()
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315
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316 def _handleError(self, res):
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317 wid, data = res
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318 logger.error("Worker %d failed to send its report." % wid)
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319 logger.exception(data)
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320
461
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321
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322 class FastQueue(object):
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323 def __init__(self, compress=False):
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324 self._reader, self._writer = multiprocessing.Pipe(duplex=False)
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325 self._rlock = multiprocessing.Lock()
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326 self._wlock = multiprocessing.Lock()
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327 self._compress = compress
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328
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329 def __getstate__(self):
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330 return (self._reader, self._writer, self._rlock, self._wlock,
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331 self._compress)
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332
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333 def __setstate__(self, state):
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334 (self._reader, self._writer, self._rlock, self._wlock,
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335 self._compress) = state
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336
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337 def get(self):
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338 with self._rlock:
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339 raw = self._reader.recv_bytes()
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340 if self._compress:
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341 data = zlib.decompress(raw)
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342 else:
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343 data = raw
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344 obj = unpickle(data)
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345 return obj
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346
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347 def put(self, obj):
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348 data = pickle(obj)
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349 if self._compress:
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350 raw = zlib.compress(data)
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351 else:
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352 raw = data
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353 with self._wlock:
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354 self._writer.send_bytes(raw)
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355