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annotate mercurial/worker.py @ 32042:8f8ad0139b8b

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worker: propagate exit code to main process Follows up 86cd09bc13ba.
author Yuya Nishihara <yuya@tcha.org>
date Sat, 15 Apr 2017 13:27:44 +0900
parents 9d3d56aa1a9f
children b844d0d367e2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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fed06dd07665 worker: count the number of CPUs
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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
25992
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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
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15 from .i18n import _
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16 from . import (
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17 encoding,
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18 error,
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19 pycompat,
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20 scmutil,
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21 util,
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22 )
18635
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23
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24 def countcpus():
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25 '''try to count the number of CPUs on the system'''
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26
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27 # posix
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28 try:
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29 n = int(os.sysconf('SC_NPROCESSORS_ONLN'))
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30 if n > 0:
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31 return n
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32 except (AttributeError, ValueError):
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33 pass
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34
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35 # windows
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36 try:
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37 n = int(encoding.environ['NUMBER_OF_PROCESSORS'])
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38 if n > 0:
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39 return n
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40 except (KeyError, ValueError):
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41 pass
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42
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43 return 1
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44
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45 def _numworkers(ui):
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46 s = ui.config('worker', 'numcpus')
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47 if s:
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48 try:
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49 n = int(s)
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50 if n >= 1:
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51 return n
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52 except ValueError:
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53 raise error.Abort(_('number of cpus must be an integer'))
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54 return min(max(countcpus(), 4), 32)
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55
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56 if pycompat.osname == 'posix':
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57 _startupcost = 0.01
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58 else:
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59 _startupcost = 1e30
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60
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61 def worthwhile(ui, costperop, nops):
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62 '''try to determine whether the benefit of multiple processes can
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63 outweigh the cost of starting them'''
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64 linear = costperop * nops
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65 workers = _numworkers(ui)
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66 benefit = linear - (_startupcost * workers + linear / workers)
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67 return benefit >= 0.15
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68
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69 def worker(ui, costperarg, func, staticargs, args):
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70 '''run a function, possibly in parallel in multiple worker
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71 processes.
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72
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73 returns a progress iterator
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74
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75 costperarg - cost of a single task
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76
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77 func - function to run
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78
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79 staticargs - arguments to pass to every invocation of the function
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80
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81 args - arguments to split into chunks, to pass to individual
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82 workers
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83 '''
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84 if worthwhile(ui, costperarg, len(args)):
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85 return _platformworker(ui, func, staticargs, args)
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86 return func(*staticargs + (args,))
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87
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88 def _posixworker(ui, func, staticargs, args):
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89 rfd, wfd = os.pipe()
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90 workers = _numworkers(ui)
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91 oldhandler = signal.getsignal(signal.SIGINT)
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92 signal.signal(signal.SIGINT, signal.SIG_IGN)
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93 pids, problem = set(), [0]
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94 def killworkers():
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95 # unregister SIGCHLD handler as all children will be killed. This
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96 # function shouldn't be interrupted by another SIGCHLD; otherwise pids
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97 # could be updated while iterating, which would cause inconsistency.
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98 signal.signal(signal.SIGCHLD, oldchldhandler)
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99 # if one worker bails, there's no good reason to wait for the rest
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100 for p in pids:
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101 try:
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102 os.kill(p, signal.SIGTERM)
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103 except OSError as err:
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104 if err.errno != errno.ESRCH:
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105 raise
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106 def waitforworkers(blocking=True):
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107 for pid in pids.copy():
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108 p = st = 0
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109 while True:
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110 try:
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111 p, st = os.waitpid(pid, (0 if blocking else os.WNOHANG))
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112 break
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113 except OSError as e:
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114 if e.errno == errno.EINTR:
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115 continue
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116 elif e.errno == errno.ECHILD:
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117 # child would already be reaped, but pids yet been
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118 # updated (maybe interrupted just after waitpid)
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119 pids.discard(pid)
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120 break
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121 else:
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122 raise
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123 if not p:
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124 # skip subsequent steps, because child process should
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125 # be still running in this case
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126 continue
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127 pids.discard(p)
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128 st = _exitstatus(st)
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129 if st and not problem[0]:
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130 problem[0] = st
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131 def sigchldhandler(signum, frame):
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132 waitforworkers(blocking=False)
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133 if problem[0]:
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134 killworkers()
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135 oldchldhandler = signal.signal(signal.SIGCHLD, sigchldhandler)
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136 ui.flush()
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137 for pargs in partition(args, workers):
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138 pid = os.fork()
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139 if pid == 0:
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140 signal.signal(signal.SIGINT, oldhandler)
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141 signal.signal(signal.SIGCHLD, oldchldhandler)
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142
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143 def workerfunc():
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144 os.close(rfd)
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145 for i, item in func(*(staticargs + (pargs,))):
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146 os.write(wfd, '%d %s\n' % (i, item))
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147 return 0
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148
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149 # make sure we use os._exit in all code paths. otherwise the worker
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150 # may do some clean-ups which could cause surprises like deadlock.
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151 # see sshpeer.cleanup for example.
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152 ret = 0
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153 try:
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154 try:
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155 ret = scmutil.callcatch(ui, workerfunc)
30882
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156 finally:
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157 ui.flush()
18638
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158 except KeyboardInterrupt:
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159 os._exit(255)
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160 except: # never return, therefore no re-raises
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161 try:
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162 ui.traceback()
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163 ui.flush()
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164 finally:
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165 os._exit(255)
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166 else:
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167 os._exit(ret & 255)
30423
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168 pids.add(pid)
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169 os.close(wfd)
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170 fp = os.fdopen(rfd, pycompat.sysstr('rb'), 0)
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171 def cleanup():
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172 signal.signal(signal.SIGINT, oldhandler)
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parents: 30425
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173 waitforworkers()
30425
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174 signal.signal(signal.SIGCHLD, oldchldhandler)
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175 status = problem[0]
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176 if status:
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177 if status < 0:
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178 os.kill(os.getpid(), -status)
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179 sys.exit(status)
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180 try:
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181 for line in util.iterfile(fp):
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182 l = line.split(' ', 1)
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183 yield int(l[0]), l[1][:-1]
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184 except: # re-raises
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185 killworkers()
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186 cleanup()
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187 raise
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188 cleanup()
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189
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190 def _posixexitstatus(code):
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191 '''convert a posix exit status into the same form returned by
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192 os.spawnv
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193
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194 returns None if the process was stopped instead of exiting'''
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195 if os.WIFEXITED(code):
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196 return os.WEXITSTATUS(code)
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197 elif os.WIFSIGNALED(code):
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198 return -os.WTERMSIG(code)
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diff changeset
199
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200 if pycompat.osname != 'nt':
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201 _platformworker = _posixworker
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202 _exitstatus = _posixexitstatus
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203
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Bryan O'Sullivan <bryano@fb.com>
parents: 18636
diff changeset
204 def partition(lst, nslices):
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205 '''partition a list into N slices of roughly equal size
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diff changeset
206
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diff changeset
207 The current strategy takes every Nth element from the input. If
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diff changeset
208 we ever write workers that need to preserve grouping in input
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diff changeset
209 we should consider allowing callers to specify a partition strategy.
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diff changeset
210
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211 mpm is not a fan of this partitioning strategy when files are involved.
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diff changeset
212 In his words:
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diff changeset
213
3eb7faf6d958 worker: document poor partitioning scheme impact
Gregory Szorc <gregory.szorc@gmail.com>
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diff changeset
214 Single-threaded Mercurial makes a point of creating and visiting
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diff changeset
215 files in a fixed order (alphabetical). When creating files in order,
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diff changeset
216 a typical filesystem is likely to allocate them on nearby regions on
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 28181
diff changeset
217 disk. Thus, when revisiting in the same order, locality is maximized
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diff changeset
218 and various forms of OS and disk-level caching and read-ahead get a
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parents: 28181
diff changeset
219 chance to work.
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parents: 28181
diff changeset
220
3eb7faf6d958 worker: document poor partitioning scheme impact
Gregory Szorc <gregory.szorc@gmail.com>
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diff changeset
221 This effect can be quite significant on spinning disks. I discovered it
3eb7faf6d958 worker: document poor partitioning scheme impact
Gregory Szorc <gregory.szorc@gmail.com>
parents: 28181
diff changeset
222 circa Mercurial v0.4 when revlogs were named by hashes of filenames.
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parents: 28181
diff changeset
223 Tarring a repo and copying it to another disk effectively randomized
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 28181
diff changeset
224 the revlog ordering on disk by sorting the revlogs by hash and suddenly
3eb7faf6d958 worker: document poor partitioning scheme impact
Gregory Szorc <gregory.szorc@gmail.com>
parents: 28181
diff changeset
225 performance of my kernel checkout benchmark dropped by ~10x because the
3eb7faf6d958 worker: document poor partitioning scheme impact
Gregory Szorc <gregory.szorc@gmail.com>
parents: 28181
diff changeset
226 "working set" of sectors visited no longer fit in the drive's cache and
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 28181
diff changeset
227 the workload switched from streaming to random I/O.
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 28181
diff changeset
228
3eb7faf6d958 worker: document poor partitioning scheme impact
Gregory Szorc <gregory.szorc@gmail.com>
parents: 28181
diff changeset
229 What we should really be doing is have workers read filenames from a
3eb7faf6d958 worker: document poor partitioning scheme impact
Gregory Szorc <gregory.szorc@gmail.com>
parents: 28181
diff changeset
230 ordered queue. This preserves locality and also keeps any worker from
3eb7faf6d958 worker: document poor partitioning scheme impact
Gregory Szorc <gregory.szorc@gmail.com>
parents: 28181
diff changeset
231 getting more than one file out of balance.
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parents: 26587
diff changeset
232 '''
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parents: 26587
diff changeset
233 for i in range(nslices):
f8efc8a3a991 worker: change partition strategy to every Nth element
Gregory Szorc <gregory.szorc@gmail.com>
parents: 26587
diff changeset
234 yield lst[i::nslices]