Mercurial > piecrust2

annotate piecrust/workerpool.py @ 691:9ae9390192da

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bake: Use standard pickle and queue for now to fix some small issues. * JSON leads to some problems with integers as keys. * Add some stats to the baking process.
author Ludovic Chabant <ludovic@chabant.com>
date Mon, 21 Mar 2016 22:28:57 -0700
parents 61d606fbc313
children d2a87365b85b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 import io
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2 import os
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3 import sys
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4 import time
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5 import zlib
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6 import pickle
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7 import logging
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8 import itertools
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9 import threading
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10 import multiprocessing
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11
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12
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13 logger = logging.getLogger(__name__)
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14
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15
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16 class IWorker(object):
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17 def initialize(self):
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18 raise NotImplementedError()
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19
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20 def process(self, job):
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21 raise NotImplementedError()
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22
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23 def getReport(self, pool_reports):
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24 return None
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25
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26
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27 TASK_JOB = 0
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28 TASK_BATCH = 1
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29 TASK_END = 2
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30
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31
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32 def worker_func(params):
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33 if params.is_profiling:
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34 try:
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35 import cProfile as profile
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36 except ImportError:
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37 import profile
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38
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39 params.is_profiling = False
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40 name = params.worker_class.__name__
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41 profile.runctx('_real_worker_func(params)',
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42 globals(), locals(),
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43 filename='%s-%d.prof' % (name, params.wid))
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44 else:
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45 _real_worker_func(params)
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46
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47
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48 def _real_worker_func(params):
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49 # In a context where `multiprocessing` is using the `spawn` forking model,
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50 # the new process doesn't inherit anything, so we lost all our logging
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51 # configuration here. Let's set it up again.
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52 if (hasattr(multiprocessing, 'get_start_method') and
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53 multiprocessing.get_start_method() == 'spawn'):
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54 from piecrust.main import _pre_parse_chef_args
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55 _pre_parse_chef_args(sys.argv[1:])
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56
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57 wid = params.wid
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58 logger.debug("Worker %d initializing..." % wid)
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59
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60 params.inqueue._writer.close()
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61 params.outqueue._reader.close()
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62
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63 w = params.worker_class(*params.initargs)
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64 w.wid = wid
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65 try:
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66 w.initialize()
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67 except Exception as ex:
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68 logger.error("Working failed to initialize:")
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69 logger.exception(ex)
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70 params.outqueue.put(None)
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71 return
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72
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73 get = params.inqueue.get
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74 put = params.outqueue.put
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75
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76 completed = 0
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77 time_in_get = 0
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78 time_in_put = 0
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79 while True:
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80 get_start_time = time.perf_counter()
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81 try:
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82 task = get()
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83 except (EOFError, OSError):
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84 logger.debug("Worker %d encountered connection problem." % wid)
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85 break
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86 time_in_get += (time.perf_counter() - get_start_time)
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87
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88 task_type, task_data = task
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89 if task_type == TASK_END:
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90 logger.debug("Worker %d got end task, exiting." % wid)
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91 wprep = {
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92 'WorkerTaskGet': time_in_get,
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93 'WorkerResultPut': time_in_put}
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94 try:
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95 rep = (task_type, True, wid, (wid, w.getReport(wprep)))
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96 except Exception as e:
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97 logger.debug("Error getting report: %s" % e)
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98 if params.wrap_exception:
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99 e = multiprocessing.ExceptionWithTraceback(
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100 e, e.__traceback__)
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101 rep = (task_type, False, wid, (wid, e))
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102 put(rep)
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103 break
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104
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105 if task_type == TASK_JOB:
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106 task_data = (task_data,)
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107
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108 for t in task_data:
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109 try:
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110 res = (TASK_JOB, True, wid, w.process(t))
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111 except Exception as e:
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112 if params.wrap_exception:
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113 e = multiprocessing.ExceptionWithTraceback(
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114 e, e.__traceback__)
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115 res = (TASK_JOB, False, wid, e)
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116
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117 put_start_time = time.perf_counter()
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118 put(res)
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119 time_in_put += (time.perf_counter() - put_start_time)
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120
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121 completed += 1
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122
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123 logger.debug("Worker %d completed %d tasks." % (wid, completed))
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124
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125
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126 class _WorkerParams(object):
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127 def __init__(self, wid, inqueue, outqueue, worker_class, initargs=(),
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128 wrap_exception=False, is_profiling=False):
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129 self.wid = wid
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130 self.inqueue = inqueue
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131 self.outqueue = outqueue
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132 self.worker_class = worker_class
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133 self.initargs = initargs
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134 self.wrap_exception = wrap_exception
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135 self.is_profiling = is_profiling
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136
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137
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138 class WorkerPool(object):
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139 def __init__(self, worker_class, initargs=(),
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140 worker_count=None, batch_size=None,
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141 wrap_exception=False):
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142 worker_count = worker_count or os.cpu_count() or 1
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143
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144 use_fastqueue = False
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145 if use_fastqueue:
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146 self._task_queue = FastQueue()
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147 self._result_queue = FastQueue()
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148 self._quick_put = self._task_queue.put
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149 self._quick_get = self._result_queue.get
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150 else:
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151 self._task_queue = multiprocessing.SimpleQueue()
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152 self._result_queue = multiprocessing.SimpleQueue()
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153 self._quick_put = self._task_queue._writer.send
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154 self._quick_get = self._result_queue._reader.recv
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155
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156 self._batch_size = batch_size
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157 self._callback = None
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158 self._error_callback = None
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159 self._listener = None
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160
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161 main_module = sys.modules['__main__']
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162 is_profiling = os.path.basename(main_module.__file__) in [
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163 'profile.py', 'cProfile.py']
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164
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165 self._pool = []
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166 for i in range(worker_count):
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167 worker_params = _WorkerParams(
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168 i, self._task_queue, self._result_queue,
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169 worker_class, initargs,
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170 wrap_exception=wrap_exception,
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171 is_profiling=is_profiling)
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172 w = multiprocessing.Process(target=worker_func,
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173 args=(worker_params,))
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174 w.name = w.name.replace('Process', 'PoolWorker')
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175 w.daemon = True
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176 w.start()
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177 self._pool.append(w)
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178
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179 self._result_handler = threading.Thread(
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180 target=WorkerPool._handleResults,
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181 args=(self,))
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182 self._result_handler.daemon = True
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183 self._result_handler.start()
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184
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185 self._closed = False
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186
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187 def setHandler(self, callback=None, error_callback=None):
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188 self._callback = callback
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189 self._error_callback = error_callback
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190
460
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191 def queueJobs(self, jobs, handler=None, chunk_size=None):
447
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192 if self._closed:
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193 raise Exception("This worker pool has been closed.")
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194 if self._listener is not None:
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195 raise Exception("A previous job queue has not finished yet.")
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196
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8351a77e13f5 bake: Don't pass the previous record entries to the workers.
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197 if any([not p.is_alive() for p in self._pool]):
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parents: 451
diff changeset
198 raise Exception("Some workers have prematurely exited.")
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199
447
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200 if handler is not None:
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201 self.setHandler(handler)
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202
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203 if not hasattr(jobs, '__len__'):
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204 jobs = list(jobs)
460
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diff changeset
205 job_count = len(jobs)
447
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206
460
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diff changeset
207 res = AsyncResult(self, job_count)
447
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208 if res._count == 0:
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209 res._event.set()
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210 return res
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211
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212 self._listener = res
460
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diff changeset
213
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diff changeset
214 if chunk_size is None:
462
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215 chunk_size = self._batch_size
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diff changeset
216 if chunk_size is None:
460
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diff changeset
217 chunk_size = max(1, job_count // 50)
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diff changeset
218 logger.debug("Using chunk size of %d" % chunk_size)
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diff changeset
219
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diff changeset
220 if chunk_size is None or chunk_size == 1:
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Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
221 for job in jobs:
461
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diff changeset
222 self._quick_put((TASK_JOB, job))
460
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parents: 453
diff changeset
223 else:
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diff changeset
224 it = iter(jobs)
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diff changeset
225 while True:
461
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diff changeset
226 batch = tuple([i for i in itertools.islice(it, chunk_size)])
460
55fc8918cb75 bake: Use batched jobs in the worker pool.
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parents: 453
diff changeset
227 if not batch:
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Ludovic Chabant <ludovic@chabant.com>
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diff changeset
228 break
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diff changeset
229 self._quick_put((TASK_BATCH, batch))
447
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diff changeset
230
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diff changeset
231 return res
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diff changeset
232
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233 def close(self):
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diff changeset
234 if self._listener is not None:
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diff changeset
235 raise Exception("A previous job queue has not finished yet.")
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diff changeset
236
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diff changeset
237 logger.debug("Closing worker pool...")
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diff changeset
238 handler = _ReportHandler(len(self._pool))
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diff changeset
239 self._callback = handler._handle
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diff changeset
240 for w in self._pool:
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diff changeset
241 self._quick_put((TASK_END, None))
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parents:
diff changeset
242 for w in self._pool:
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diff changeset
243 w.join()
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diff changeset
244
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diff changeset
245 logger.debug("Waiting for reports...")
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parents:
diff changeset
246 if not handler.wait(2):
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diff changeset
247 missing = handler.reports.index(None)
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parents:
diff changeset
248 logger.warning(
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
249 "Didn't receive all worker reports before timeout. "
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
250 "Missing report from worker %d." % missing)
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
251
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diff changeset
252 logger.debug("Exiting result handler thread...")
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diff changeset
253 self._result_queue.put(None)
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diff changeset
254 self._result_handler.join()
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diff changeset
255 self._closed = True
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diff changeset
256
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diff changeset
257 return handler.reports
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diff changeset
258
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diff changeset
259 @staticmethod
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diff changeset
260 def _handleResults(pool):
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parents:
diff changeset
261 while True:
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parents:
diff changeset
262 try:
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parents:
diff changeset
263 res = pool._quick_get()
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parents:
diff changeset
264 except (EOFError, OSError):
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parents:
diff changeset
265 logger.debug("Result handler thread encountered connection "
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
266 "problem, exiting.")
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parents:
diff changeset
267 return
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parents:
diff changeset
268
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269 if res is None:
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270 logger.debug("Result handler exiting.")
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271 break
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272
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273 task_type, success, wid, data = res
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274 try:
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275 if success and pool._callback:
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276 pool._callback(data)
451
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parents: 447
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277 elif not success:
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parents: 447
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278 if pool._error_callback:
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279 pool._error_callback(data)
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280 else:
687
61d606fbc313 bake: Change `show-timers` to `show-stats`, add stats.
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281 logger.error("Got error data:")
451
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282 logger.error(data)
447
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283 except Exception as ex:
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284 logger.exception(ex)
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285
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286 if task_type == TASK_JOB:
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287 pool._listener._onTaskDone()
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288
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289
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290 class AsyncResult(object):
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291 def __init__(self, pool, count):
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292 self._pool = pool
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293 self._count = count
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294 self._event = threading.Event()
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295
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296 def ready(self):
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297 return self._event.is_set()
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298
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299 def wait(self, timeout=None):
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300 return self._event.wait(timeout)
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301
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302 def _onTaskDone(self):
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303 self._count -= 1
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304 if self._count == 0:
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305 self._pool.setHandler(None)
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306 self._pool._listener = None
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307 self._event.set()
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308
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309
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310 class _ReportHandler(object):
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311 def __init__(self, worker_count):
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312 self.reports = [None] * worker_count
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313 self._count = worker_count
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314 self._received = 0
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315 self._event = threading.Event()
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316
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317 def wait(self, timeout=None):
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318 return self._event.wait(timeout)
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319
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320 def _handle(self, res):
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321 wid, data = res
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322 if wid < 0 or wid > self._count:
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323 logger.error("Ignoring report from unknown worker %d." % wid)
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parents:
diff changeset
324 return
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325
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326 self._received += 1
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327 self.reports[wid] = data
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parents:
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328
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parents:
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329 if self._received == self._count:
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parents:
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330 self._event.set()
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parents:
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331
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parents:
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332 def _handleError(self, res):
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333 wid, data = res
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334 logger.error("Worker %d failed to send its report." % wid)
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parents:
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335 logger.exception(data)
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336
461
b015e38d4ee1 internal: Handle data serialization more under the hood.
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diff changeset
337
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diff changeset
338 class FastQueue(object):
691
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339 def __init__(self):
461
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diff changeset
340 self._reader, self._writer = multiprocessing.Pipe(duplex=False)
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parents: 460
diff changeset
341 self._rlock = multiprocessing.Lock()
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diff changeset
342 self._wlock = multiprocessing.Lock()
691
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diff changeset
343 self._rbuf = io.BytesIO()
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diff changeset
344 self._rbuf.truncate(256)
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345 self._wbuf = io.BytesIO()
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diff changeset
346 self._wbuf.truncate(256)
461
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diff changeset
347
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diff changeset
348 def __getstate__(self):
691
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diff changeset
349 return (self._reader, self._writer, self._rlock, self._wlock)
461
b015e38d4ee1 internal: Handle data serialization more under the hood.
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parents: 460
diff changeset
350
b015e38d4ee1 internal: Handle data serialization more under the hood.
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diff changeset
351 def __setstate__(self, state):
691
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diff changeset
352 (self._reader, self._writer, self._rlock, self._wlock) = state
461
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parents: 460
diff changeset
353
b015e38d4ee1 internal: Handle data serialization more under the hood.
Ludovic Chabant <ludovic@chabant.com>
parents: 460
diff changeset
354 def get(self):
b015e38d4ee1 internal: Handle data serialization more under the hood.
Ludovic Chabant <ludovic@chabant.com>
parents: 460
diff changeset
355 with self._rlock:
691
9ae9390192da bake: Use standard pickle and queue for now to fix some small issues.
Ludovic Chabant <ludovic@chabant.com>
parents: 687
diff changeset
356 try:
9ae9390192da bake: Use standard pickle and queue for now to fix some small issues.
Ludovic Chabant <ludovic@chabant.com>
parents: 687
diff changeset
357 with self._rbuf.getbuffer() as b:
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Ludovic Chabant <ludovic@chabant.com>
parents: 687
diff changeset
358 self._reader.recv_bytes_into(b)
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Ludovic Chabant <ludovic@chabant.com>
parents: 687
diff changeset
359 except multiprocessing.BufferTooShort as e:
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Ludovic Chabant <ludovic@chabant.com>
parents: 687
diff changeset
360 self._rbuf.truncate(len(e.args[0]) * 2)
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parents: 687
diff changeset
361 self._rbuf.seek(0)
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Ludovic Chabant <ludovic@chabant.com>
parents: 687
diff changeset
362 self._rbuf.write(e.args[0])
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Ludovic Chabant <ludovic@chabant.com>
parents: 687
diff changeset
363
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Ludovic Chabant <ludovic@chabant.com>
parents: 687
diff changeset
364 self._rbuf.seek(0)
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Ludovic Chabant <ludovic@chabant.com>
parents: 687
diff changeset
365 return self._unpickle(self._rbuf)
461
b015e38d4ee1 internal: Handle data serialization more under the hood.
Ludovic Chabant <ludovic@chabant.com>
parents: 460
diff changeset
366
b015e38d4ee1 internal: Handle data serialization more under the hood.
Ludovic Chabant <ludovic@chabant.com>
parents: 460
diff changeset
367 def put(self, obj):
691
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parents: 687
diff changeset
368 self._wbuf.seek(0)
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Ludovic Chabant <ludovic@chabant.com>
parents: 687
diff changeset
369 self._pickle(obj, self._wbuf)
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Ludovic Chabant <ludovic@chabant.com>
parents: 687
diff changeset
370 size = self._wbuf.tell()
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parents: 687
diff changeset
371
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Ludovic Chabant <ludovic@chabant.com>
parents: 687
diff changeset
372 self._wbuf.seek(0)
461
b015e38d4ee1 internal: Handle data serialization more under the hood.
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parents: 460
diff changeset
373 with self._wlock:
691
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Ludovic Chabant <ludovic@chabant.com>
parents: 687
diff changeset
374 with self._wbuf.getbuffer() as b:
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Ludovic Chabant <ludovic@chabant.com>
parents: 687
diff changeset
375 self._writer.send_bytes(b, 0, size)
461
b015e38d4ee1 internal: Handle data serialization more under the hood.
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parents: 460
diff changeset
376
691
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parents: 687
diff changeset
377 def _pickle(self, obj, buf):
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Ludovic Chabant <ludovic@chabant.com>
parents: 687
diff changeset
378 pickle.dump(obj, buf, pickle.HIGHEST_PROTOCOL)
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Ludovic Chabant <ludovic@chabant.com>
parents: 687
diff changeset
379
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Ludovic Chabant <ludovic@chabant.com>
parents: 687
diff changeset
380 def _unpickle(self, buf):
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Ludovic Chabant <ludovic@chabant.com>
parents: 687
diff changeset
381 return pickle.load(buf)
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Ludovic Chabant <ludovic@chabant.com>
parents: 687
diff changeset
382