Mercurial > hg
annotate mercurial/worker.py @ 47060:fde5bb5d1acf
merge: with stable
author | Augie Fackler <augie@google.com> |
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date | Mon, 03 May 2021 15:14:09 -0400 |
parents | d4ba4d51f85f |
children | df56e6bd37f6 2fe4efaa59af |
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1 # worker.py - master-slave parallelism support |
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2 # |
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3 # Copyright 2013 Facebook, Inc. |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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6 # GNU General Public License version 2 or any later version. |
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7 |
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8 from __future__ import absolute_import |
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9 |
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10 import errno |
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11 import os |
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12 import signal |
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13 import sys |
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14 import threading |
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15 import time |
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16 |
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17 try: |
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18 import selectors |
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19 |
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20 selectors.BaseSelector |
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21 except ImportError: |
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22 from .thirdparty import selectors2 as selectors |
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23 |
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24 from .i18n import _ |
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26 encoding, |
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28 pycompat, |
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29 scmutil, |
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31 ) | |
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32 |
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33 |
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34 def countcpus(): |
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35 '''try to count the number of CPUs on the system''' |
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36 |
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37 # posix |
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38 try: |
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39 n = int(os.sysconf('SC_NPROCESSORS_ONLN')) |
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40 if n > 0: |
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41 return n |
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42 except (AttributeError, ValueError): |
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43 pass |
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44 |
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45 # windows |
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46 try: |
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47 n = int(encoding.environ[b'NUMBER_OF_PROCESSORS']) |
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48 if n > 0: |
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49 return n |
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50 except (KeyError, ValueError): |
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51 pass |
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52 |
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53 return 1 |
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54 |
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55 |
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56 def _numworkers(ui): |
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57 s = ui.config(b'worker', b'numcpus') |
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58 if s: |
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59 try: |
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60 n = int(s) |
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61 if n >= 1: |
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62 return n |
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63 except ValueError: |
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64 raise error.Abort(_(b'number of cpus must be an integer')) |
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65 return min(max(countcpus(), 4), 32) |
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66 |
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67 |
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68 if pycompat.ispy3: |
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69 |
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70 def ismainthread(): |
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71 return threading.current_thread() == threading.main_thread() |
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72 |
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73 class _blockingreader(object): |
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74 def __init__(self, wrapped): |
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75 self._wrapped = wrapped |
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76 |
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77 # Do NOT implement readinto() by making it delegate to |
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78 # _wrapped.readinto(), since that is unbuffered. The unpickler is fine |
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79 # with just read() and readline(), so we don't need to implement it. |
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80 |
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81 def readline(self): |
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82 return self._wrapped.readline() |
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83 |
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84 # issue multiple reads until size is fulfilled |
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85 def read(self, size=-1): |
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86 if size < 0: |
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87 return self._wrapped.readall() |
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88 |
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89 buf = bytearray(size) |
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90 view = memoryview(buf) |
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91 pos = 0 |
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92 |
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93 while pos < size: |
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94 ret = self._wrapped.readinto(view[pos:]) |
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95 if not ret: |
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96 break |
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97 pos += ret |
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98 |
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99 del view |
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100 del buf[pos:] |
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101 return bytes(buf) |
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102 |
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103 |
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104 else: |
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105 |
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106 def ismainthread(): |
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107 # pytype: disable=module-attr |
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108 return isinstance(threading.current_thread(), threading._MainThread) |
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109 # pytype: enable=module-attr |
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110 |
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111 def _blockingreader(wrapped): |
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112 return wrapped |
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113 |
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114 |
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115 if pycompat.isposix or pycompat.iswindows: |
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116 _STARTUP_COST = 0.01 |
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117 # The Windows worker is thread based. If tasks are CPU bound, threads |
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118 # in the presence of the GIL result in excessive context switching and |
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119 # this overhead can slow down execution. |
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120 _DISALLOW_THREAD_UNSAFE = pycompat.iswindows |
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121 else: |
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122 _STARTUP_COST = 1e30 |
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123 _DISALLOW_THREAD_UNSAFE = False |
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124 |
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125 |
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126 def worthwhile(ui, costperop, nops, threadsafe=True): |
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127 """try to determine whether the benefit of multiple processes can |
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128 outweigh the cost of starting them""" |
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129 |
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130 if not threadsafe and _DISALLOW_THREAD_UNSAFE: |
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131 return False |
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132 |
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133 linear = costperop * nops |
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134 workers = _numworkers(ui) |
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135 benefit = linear - (_STARTUP_COST * workers + linear / workers) |
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136 return benefit >= 0.15 |
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137 |
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138 |
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139 def worker( |
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140 ui, costperarg, func, staticargs, args, hasretval=False, threadsafe=True |
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141 ): |
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142 """run a function, possibly in parallel in multiple worker |
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143 processes. |
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144 |
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145 returns a progress iterator |
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146 |
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147 costperarg - cost of a single task |
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148 |
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149 func - function to run. It is expected to return a progress iterator. |
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150 |
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151 staticargs - arguments to pass to every invocation of the function |
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152 |
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153 args - arguments to split into chunks, to pass to individual |
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154 workers |
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155 |
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156 hasretval - when True, func and the current function return an progress |
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157 iterator then a dict (encoded as an iterator that yield many (False, ..) |
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158 then a (True, dict)). The dicts are joined in some arbitrary order, so |
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159 overlapping keys are a bad idea. |
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160 |
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161 threadsafe - whether work items are thread safe and can be executed using |
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162 a thread-based worker. Should be disabled for CPU heavy tasks that don't |
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163 release the GIL. |
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164 """ |
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165 enabled = ui.configbool(b'worker', b'enabled') |
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166 if enabled and _platformworker is _posixworker and not ismainthread(): |
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167 # The POSIX worker has to install a handler for SIGCHLD. |
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168 # Python up to 3.9 only allows this in the main thread. |
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169 enabled = False |
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170 |
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171 if enabled and worthwhile(ui, costperarg, len(args), threadsafe=threadsafe): |
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172 return _platformworker(ui, func, staticargs, args, hasretval) |
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173 return func(*staticargs + (args,)) |
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174 |
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175 |
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176 def _posixworker(ui, func, staticargs, args, hasretval): |
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177 workers = _numworkers(ui) |
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178 oldhandler = signal.getsignal(signal.SIGINT) |
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179 signal.signal(signal.SIGINT, signal.SIG_IGN) |
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181 |
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182 def killworkers(): |
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183 # unregister SIGCHLD handler as all children will be killed. This |
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184 # function shouldn't be interrupted by another SIGCHLD; otherwise pids |
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185 # could be updated while iterating, which would cause inconsistency. |
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186 signal.signal(signal.SIGCHLD, oldchldhandler) |
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187 # if one worker bails, there's no good reason to wait for the rest |
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188 for p in pids: |
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189 try: |
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190 os.kill(p, signal.SIGTERM) |
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191 except OSError as err: |
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192 if err.errno != errno.ESRCH: |
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193 raise |
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194 |
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195 def waitforworkers(blocking=True): |
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196 for pid in pids.copy(): |
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197 p = st = 0 |
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198 while True: |
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199 try: |
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200 p, st = os.waitpid(pid, (0 if blocking else os.WNOHANG)) |
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201 break |
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202 except OSError as e: |
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203 if e.errno == errno.EINTR: |
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204 continue |
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205 elif e.errno == errno.ECHILD: |
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206 # child would already be reaped, but pids yet been |
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207 # updated (maybe interrupted just after waitpid) |
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208 pids.discard(pid) |
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209 break |
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210 else: |
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211 raise |
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212 if not p: |
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213 # skip subsequent steps, because child process should |
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214 # be still running in this case |
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215 continue |
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216 pids.discard(p) |
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217 st = _exitstatus(st) |
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218 if st and not problem[0]: |
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219 problem[0] = st |
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220 |
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221 def sigchldhandler(signum, frame): |
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222 waitforworkers(blocking=False) |
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223 if problem[0]: |
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224 killworkers() |
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225 |
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226 oldchldhandler = signal.signal(signal.SIGCHLD, sigchldhandler) |
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227 ui.flush() |
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228 parentpid = os.getpid() |
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229 pipes = [] |
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230 retval = {} |
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231 for pargs in partition(args, min(workers, len(args))): |
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232 # Every worker gets its own pipe to send results on, so we don't have to |
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233 # implement atomic writes larger than PIPE_BUF. Each forked process has |
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234 # its own pipe's descriptors in the local variables, and the parent |
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235 # process has the full list of pipe descriptors (and it doesn't really |
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236 # care what order they're in). |
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237 rfd, wfd = os.pipe() |
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238 pipes.append((rfd, wfd)) |
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239 # make sure we use os._exit in all worker code paths. otherwise the |
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240 # worker may do some clean-ups which could cause surprises like |
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241 # deadlock. see sshpeer.cleanup for example. |
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242 # override error handling *before* fork. this is necessary because |
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243 # exception (signal) may arrive after fork, before "pid =" assignment |
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244 # completes, and other exception handler (dispatch.py) can lead to |
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245 # unexpected code path without os._exit. |
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246 ret = -1 |
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247 try: |
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248 pid = os.fork() |
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249 if pid == 0: |
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250 signal.signal(signal.SIGINT, oldhandler) |
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251 signal.signal(signal.SIGCHLD, oldchldhandler) |
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252 |
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253 def workerfunc(): |
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254 for r, w in pipes[:-1]: |
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255 os.close(r) |
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256 os.close(w) |
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257 os.close(rfd) |
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258 for result in func(*(staticargs + (pargs,))): |
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259 os.write(wfd, util.pickle.dumps(result)) |
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260 return 0 |
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261 |
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262 ret = scmutil.callcatch(ui, workerfunc) |
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263 except: # parent re-raises, child never returns |
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264 if os.getpid() == parentpid: |
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265 raise |
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266 exctype = sys.exc_info()[0] |
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267 force = not issubclass(exctype, KeyboardInterrupt) |
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268 ui.traceback(force=force) |
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269 finally: |
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270 if os.getpid() != parentpid: |
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271 try: |
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272 ui.flush() |
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273 except: # never returns, no re-raises |
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274 pass |
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275 finally: |
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276 os._exit(ret & 255) |
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278 selector = selectors.DefaultSelector() |
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279 for rfd, wfd in pipes: |
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280 os.close(wfd) |
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281 selector.register(os.fdopen(rfd, 'rb', 0), selectors.EVENT_READ) |
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282 |
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283 def cleanup(): |
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284 signal.signal(signal.SIGINT, oldhandler) |
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285 waitforworkers() |
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286 signal.signal(signal.SIGCHLD, oldchldhandler) |
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287 selector.close() |
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288 return problem[0] |
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289 |
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290 try: |
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291 openpipes = len(pipes) |
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292 while openpipes > 0: |
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293 for key, events in selector.select(): |
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294 try: |
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295 res = util.pickle.load(_blockingreader(key.fileobj)) |
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296 if hasretval and res[0]: |
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297 retval.update(res[1]) |
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298 else: |
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299 yield res |
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300 except EOFError: |
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301 selector.unregister(key.fileobj) |
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302 key.fileobj.close() |
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303 openpipes -= 1 |
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304 except IOError as e: |
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305 if e.errno == errno.EINTR: |
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306 continue |
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307 raise |
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308 except: # re-raises |
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309 killworkers() |
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310 cleanup() |
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311 raise |
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312 status = cleanup() |
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313 if status: |
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314 if status < 0: |
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315 os.kill(os.getpid(), -status) |
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316 raise error.WorkerError(status) |
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317 if hasretval: |
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318 yield True, retval |
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319 |
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320 |
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321 def _posixexitstatus(code): |
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322 """convert a posix exit status into the same form returned by |
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323 os.spawnv |
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324 |
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325 returns None if the process was stopped instead of exiting""" |
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326 if os.WIFEXITED(code): |
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327 return os.WEXITSTATUS(code) |
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328 elif os.WIFSIGNALED(code): |
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329 return -(os.WTERMSIG(code)) |
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330 |
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331 |
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332 def _windowsworker(ui, func, staticargs, args, hasretval): |
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333 class Worker(threading.Thread): |
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334 def __init__( |
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335 self, taskqueue, resultqueue, func, staticargs, *args, **kwargs |
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336 ): |
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337 threading.Thread.__init__(self, *args, **kwargs) |
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338 self._taskqueue = taskqueue |
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339 self._resultqueue = resultqueue |
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340 self._func = func |
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341 self._staticargs = staticargs |
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342 self._interrupted = False |
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343 self.daemon = True |
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344 self.exception = None |
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345 |
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346 def interrupt(self): |
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347 self._interrupted = True |
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348 |
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349 def run(self): |
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350 try: |
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351 while not self._taskqueue.empty(): |
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352 try: |
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353 args = self._taskqueue.get_nowait() |
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354 for res in self._func(*self._staticargs + (args,)): |
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355 self._resultqueue.put(res) |
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356 # threading doesn't provide a native way to |
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357 # interrupt execution. handle it manually at every |
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358 # iteration. |
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359 if self._interrupted: |
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360 return |
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361 except pycompat.queue.Empty: |
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362 break |
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363 except Exception as e: |
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364 # store the exception such that the main thread can resurface |
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365 # it as if the func was running without workers. |
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366 self.exception = e |
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367 raise |
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368 |
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369 threads = [] |
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370 |
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371 def trykillworkers(): |
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372 # Allow up to 1 second to clean worker threads nicely |
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373 cleanupend = time.time() + 1 |
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374 for t in threads: |
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375 t.interrupt() |
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376 for t in threads: |
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377 remainingtime = cleanupend - time.time() |
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378 t.join(remainingtime) |
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379 if t.is_alive(): |
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380 # pass over the workers joining failure. it is more |
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381 # important to surface the inital exception than the |
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382 # fact that one of workers may be processing a large |
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383 # task and does not get to handle the interruption. |
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384 ui.warn( |
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385 _( |
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386 b"failed to kill worker threads while " |
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387 b"handling an exception\n" |
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388 ) |
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389 ) |
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390 return |
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391 |
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392 workers = _numworkers(ui) |
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393 resultqueue = pycompat.queue.Queue() |
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394 taskqueue = pycompat.queue.Queue() |
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395 retval = {} |
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396 # partition work to more pieces than workers to minimize the chance |
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397 # of uneven distribution of large tasks between the workers |
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398 for pargs in partition(args, workers * 20): |
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399 taskqueue.put(pargs) |
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400 for _i in range(workers): |
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401 t = Worker(taskqueue, resultqueue, func, staticargs) |
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402 threads.append(t) |
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403 t.start() |
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404 try: |
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405 while len(threads) > 0: |
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406 while not resultqueue.empty(): |
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407 res = resultqueue.get() |
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408 if hasretval and res[0]: |
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409 retval.update(res[1]) |
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410 else: |
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411 yield res |
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412 threads[0].join(0.05) |
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413 finishedthreads = [_t for _t in threads if not _t.is_alive()] |
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414 for t in finishedthreads: |
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415 if t.exception is not None: |
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416 raise t.exception |
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417 threads.remove(t) |
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418 except (Exception, KeyboardInterrupt): # re-raises |
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419 trykillworkers() |
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420 raise |
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421 while not resultqueue.empty(): |
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422 res = resultqueue.get() |
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423 if hasretval and res[0]: |
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424 retval.update(res[1]) |
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425 else: |
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426 yield res |
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427 if hasretval: |
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428 yield True, retval |
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429 |
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430 |
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431 if pycompat.iswindows: |
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432 _platformworker = _windowsworker |
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433 else: |
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434 _platformworker = _posixworker |
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435 _exitstatus = _posixexitstatus |
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436 |
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437 |
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438 def partition(lst, nslices): |
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439 """partition a list into N slices of roughly equal size |
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440 |
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441 The current strategy takes every Nth element from the input. If |
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442 we ever write workers that need to preserve grouping in input |
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443 we should consider allowing callers to specify a partition strategy. |
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444 |
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445 olivia is not a fan of this partitioning strategy when files are involved. |
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446 In his words: |
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447 |
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448 Single-threaded Mercurial makes a point of creating and visiting |
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449 files in a fixed order (alphabetical). When creating files in order, |
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450 a typical filesystem is likely to allocate them on nearby regions on |
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451 disk. Thus, when revisiting in the same order, locality is maximized |
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452 and various forms of OS and disk-level caching and read-ahead get a |
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453 chance to work. |
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454 |
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455 This effect can be quite significant on spinning disks. I discovered it |
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456 circa Mercurial v0.4 when revlogs were named by hashes of filenames. |
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457 Tarring a repo and copying it to another disk effectively randomized |
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458 the revlog ordering on disk by sorting the revlogs by hash and suddenly |
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459 performance of my kernel checkout benchmark dropped by ~10x because the |
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460 "working set" of sectors visited no longer fit in the drive's cache and |
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461 the workload switched from streaming to random I/O. |
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462 |
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463 What we should really be doing is have workers read filenames from a |
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464 ordered queue. This preserves locality and also keeps any worker from |
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465 getting more than one file out of balance. |
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466 """ |
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467 for i in range(nslices): |
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468 yield lst[i::nslices] |