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annotate piecrust/workerpool.py @ 460:55fc8918cb75

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bake: Use batched jobs in the worker pool.
author Ludovic Chabant <ludovic@chabant.com>
date Sat, 11 Jul 2015 00:45:35 -0700
parents 8351a77e13f5
children b015e38d4ee1
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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 itertools
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5 import threading
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6 import multiprocessing
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7 from piecrust.fastpickle import pickle, unpickle
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8
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9
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10 logger = logging.getLogger(__name__)
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11
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12
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13 class IWorker(object):
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14 def initialize(self):
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15 raise NotImplementedError()
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16
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17 def process(self, job):
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18 raise NotImplementedError()
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19
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20 def getReport(self):
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21 return None
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22
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23
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24 TASK_JOB = 0
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25 TASK_BATCH = 1
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26 TASK_END = 2
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27
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28
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29 def worker_func(params):
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30 if params.is_profiling:
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31 try:
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32 import cProfile as profile
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33 except ImportError:
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34 import profile
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35
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36 params.is_profiling = False
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37 name = params.worker_class.__name__
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38 profile.runctx('_real_worker_func(params)',
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39 globals(), locals(),
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40 filename='%s-%d.prof' % (name, params.wid))
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41 else:
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42 _real_worker_func(params)
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43
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44
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45 def _real_worker_func(params):
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46 if hasattr(params.inqueue, '_writer'):
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47 params.inqueue._writer.close()
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48 params.outqueue._reader.close()
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49
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50 wid = params.wid
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51 logger.debug("Worker %d initializing..." % wid)
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52
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53 w = params.worker_class(*params.initargs)
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54 w.wid = wid
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55 try:
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56 w.initialize()
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57 except Exception as ex:
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58 logger.error("Working failed to initialize:")
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59 logger.exception(ex)
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60 params.outqueue.put(None)
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61 return
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62
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63 get = params.inqueue.get
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64 put = params.outqueue.put
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65
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66 completed = 0
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67 while True:
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68 try:
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69 task = get()
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70 except (EOFError, OSError):
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71 logger.debug("Worker %d encountered connection problem." % wid)
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72 break
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73
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74 task_type, task_data = task
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75 if task_type == TASK_END:
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76 logger.debug("Worker %d got end task, exiting." % wid)
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77 try:
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78 rep = (task_type, True, wid, (wid, w.getReport()))
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79 except Exception as e:
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80 if params.wrap_exception:
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81 e = multiprocessing.ExceptionWithTraceback(
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82 e, e.__traceback__)
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83 rep = (task_type, False, wid, (wid, e))
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84 put(rep)
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85 break
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86
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87 if task_type == TASK_JOB:
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88 task_data = (task_data,)
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89
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90 for t in task_data:
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91 td = unpickle(t)
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92 try:
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93 res = (TASK_JOB, True, wid, w.process(td))
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94 except Exception as e:
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95 if params.wrap_exception:
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96 e = multiprocessing.ExceptionWithTraceback(
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97 e, e.__traceback__)
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98 res = (TASK_JOB, False, wid, e)
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99 put(res)
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100
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101 completed += 1
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102
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103 logger.debug("Worker %d completed %d tasks." % (wid, completed))
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104
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105
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106 class _WorkerParams(object):
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107 def __init__(self, wid, inqueue, outqueue, worker_class, initargs=(),
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108 wrap_exception=False, is_profiling=False):
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109 self.wid = wid
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110 self.inqueue = inqueue
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111 self.outqueue = outqueue
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112 self.worker_class = worker_class
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113 self.initargs = initargs
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114 self.wrap_exception = wrap_exception
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115 self.is_profiling = is_profiling
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116
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117
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118 class WorkerPool(object):
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119 def __init__(self, worker_class, worker_count=None, initargs=(),
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120 wrap_exception=False):
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121 worker_count = worker_count or os.cpu_count() or 1
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122
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123 self._task_queue = multiprocessing.SimpleQueue()
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124 self._result_queue = multiprocessing.SimpleQueue()
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125 self._quick_put = self._task_queue._writer.send
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126 self._quick_get = self._result_queue._reader.recv
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127
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128 self._callback = None
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129 self._error_callback = None
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130 self._listener = None
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131
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132 main_module = sys.modules['__main__']
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133 is_profiling = os.path.basename(main_module.__file__) in [
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134 'profile.py', 'cProfile.py']
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135
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136 self._pool = []
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diff changeset
137 for i in range(worker_count):
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
138 worker_params = _WorkerParams(
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
139 i, self._task_queue, self._result_queue,
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parents:
diff changeset
140 worker_class, initargs,
451
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Ludovic Chabant <ludovic@chabant.com>
parents: 447
diff changeset
141 wrap_exception=wrap_exception,
447
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
142 is_profiling=is_profiling)
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
143 w = multiprocessing.Process(target=worker_func,
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
144 args=(worker_params,))
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
145 w.name = w.name.replace('Process', 'PoolWorker')
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
146 w.daemon = True
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
147 w.start()
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
148 self._pool.append(w)
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
149
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
150 self._result_handler = threading.Thread(
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
151 target=WorkerPool._handleResults,
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
152 args=(self,))
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
153 self._result_handler.daemon = True
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
154 self._result_handler.start()
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
155
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
156 self._closed = False
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
157
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
158 def setHandler(self, callback=None, error_callback=None):
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
159 self._callback = callback
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
160 self._error_callback = error_callback
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
161
460
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Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
162 def queueJobs(self, jobs, handler=None, chunk_size=None):
447
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
163 if self._closed:
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
164 raise Exception("This worker pool has been closed.")
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
165 if self._listener is not None:
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
166 raise Exception("A previous job queue has not finished yet.")
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Ludovic Chabant <ludovic@chabant.com>
parents:
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167
453
8351a77e13f5 bake: Don't pass the previous record entries to the workers.
Ludovic Chabant <ludovic@chabant.com>
parents: 451
diff changeset
168 if any([not p.is_alive() for p in self._pool]):
8351a77e13f5 bake: Don't pass the previous record entries to the workers.
Ludovic Chabant <ludovic@chabant.com>
parents: 451
diff changeset
169 raise Exception("Some workers have prematurely exited.")
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Ludovic Chabant <ludovic@chabant.com>
parents: 451
diff changeset
170
447
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Ludovic Chabant <ludovic@chabant.com>
parents:
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171 if handler is not None:
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
172 self.setHandler(handler)
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Ludovic Chabant <ludovic@chabant.com>
parents:
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173
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Ludovic Chabant <ludovic@chabant.com>
parents:
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174 if not hasattr(jobs, '__len__'):
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
175 jobs = list(jobs)
460
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Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
176 job_count = len(jobs)
447
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
177
460
55fc8918cb75 bake: Use batched jobs in the worker pool.
Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
178 res = AsyncResult(self, job_count)
447
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
179 if res._count == 0:
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
180 res._event.set()
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
181 return res
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
182
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
183 self._listener = res
460
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Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
184
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Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
185 if chunk_size is None:
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Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
186 chunk_size = max(1, job_count // 50)
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Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
187 logger.debug("Using chunk size of %d" % chunk_size)
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Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
188
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Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
189 if chunk_size is None or chunk_size == 1:
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Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
190 for job in jobs:
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Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
191 job_data = pickle(job)
55fc8918cb75 bake: Use batched jobs in the worker pool.
Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
192 self._quick_put((TASK_JOB, job_data))
55fc8918cb75 bake: Use batched jobs in the worker pool.
Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
193 else:
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Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
194 it = iter(jobs)
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Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
195 while True:
55fc8918cb75 bake: Use batched jobs in the worker pool.
Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
196 batch = tuple([pickle(i)
55fc8918cb75 bake: Use batched jobs in the worker pool.
Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
197 for i in itertools.islice(it, chunk_size)])
55fc8918cb75 bake: Use batched jobs in the worker pool.
Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
198 if not batch:
55fc8918cb75 bake: Use batched jobs in the worker pool.
Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
199 break
55fc8918cb75 bake: Use batched jobs in the worker pool.
Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
200 self._quick_put((TASK_BATCH, batch))
447
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
201
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
202 return res
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
203
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
204 def close(self):
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
205 if self._listener is not None:
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
206 raise Exception("A previous job queue has not finished yet.")
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
207
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
208 logger.debug("Closing worker pool...")
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
209 handler = _ReportHandler(len(self._pool))
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
210 self._callback = handler._handle
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
211 for w in self._pool:
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
212 self._quick_put((TASK_END, None))
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
213 for w in self._pool:
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
214 w.join()
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
215
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
216 logger.debug("Waiting for reports...")
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
217 if not handler.wait(2):
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
218 missing = handler.reports.index(None)
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
219 logger.warning(
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
220 "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
221 "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
222
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
223 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
224 self._result_queue.put(None)
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
225 self._result_handler.join()
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
226 self._closed = True
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
227
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
228 return handler.reports
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
229
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
230 @staticmethod
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
231 def _handleResults(pool):
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
232 while True:
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
233 try:
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
234 res = pool._quick_get()
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
235 except (EOFError, OSError):
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
236 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
237 "problem, exiting.")
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
238 return
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
239
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
240 if res is None:
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
241 logger.debug("Result handler exiting.")
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
242 break
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
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 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
245 try:
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
246 if success and pool._callback:
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
247 pool._callback(data)
451
838f3964f400 bake: Optimize the bake by not using custom classes for passing info.
Ludovic Chabant <ludovic@chabant.com>
parents: 447
diff changeset
248 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
249 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
250 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
251 else:
838f3964f400 bake: Optimize the bake by not using custom classes for passing info.
Ludovic Chabant <ludovic@chabant.com>
parents: 447
diff changeset
252 logger.error(data)
447
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
253 except Exception as ex:
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
254 logger.exception(ex)
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
255
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
256 if task_type == TASK_JOB:
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
257 pool._listener._onTaskDone()
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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
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
260 class AsyncResult(object):
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
261 def __init__(self, pool, count):
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
262 self._pool = pool
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
263 self._count = count
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
264 self._event = threading.Event()
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
265
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
266 def ready(self):
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
267 return self._event.is_set()
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
268
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
269 def wait(self, timeout=None):
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
270 return self._event.wait(timeout)
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
271
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
272 def _onTaskDone(self):
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
273 self._count -= 1
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
274 if self._count == 0:
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
275 self._pool.setHandler(None)
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276 self._pool._listener = None
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277 self._event.set()
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278
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279
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280 class _ReportHandler(object):
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281 def __init__(self, worker_count):
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282 self.reports = [None] * worker_count
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283 self._count = worker_count
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284 self._received = 0
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285 self._event = threading.Event()
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286
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287 def wait(self, timeout=None):
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288 return self._event.wait(timeout)
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289
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290 def _handle(self, res):
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291 wid, data = res
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292 if wid < 0 or wid > self._count:
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293 logger.error("Ignoring report from unknown worker %d." % wid)
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294 return
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295
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296 self._received += 1
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297 self.reports[wid] = data
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298
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299 if self._received == self._count:
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300 self._event.set()
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301
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302 def _handleError(self, res):
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303 wid, data = res
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304 logger.error("Worker %d failed to send its report." % wid)
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305 logger.exception(data)
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306