Mercurial > hg
annotate mercurial/worker.py @ 30884:a68510b69f41
chg: verify XDG_RUNTIME_DIR
According to the specification [1], $XDG_RUNTIME_DIR should be ignored
unless:
The directory MUST be owned by the user, and he MUST be the only one
having read and write access to it. Its Unix access mode MUST be 0700.
This patch adds a check and ignores it if it does not meet part of the
criteria.
[1]: https://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
author | Jun Wu <quark@fb.com> |
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date | Mon, 06 Feb 2017 17:01:06 -0800 |
parents | d524c88511a7 |
children | 48dea083f66d 18fb3cf572b4 |
rev | line source |
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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 |
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15 from .i18n import _ |
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17 encoding, |
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19 pycompat, |
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20 scmutil, |
30396 | 21 util, |
22 ) | |
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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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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 p: |
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124 pids.discard(p) |
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125 st = _exitstatus(st) |
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126 if st and not problem[0]: |
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127 problem[0] = st |
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128 def sigchldhandler(signum, frame): |
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129 waitforworkers(blocking=False) |
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130 if problem[0]: |
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131 killworkers() |
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132 oldchldhandler = signal.signal(signal.SIGCHLD, sigchldhandler) |
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133 for pargs in partition(args, workers): |
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134 pid = os.fork() |
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135 if pid == 0: |
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136 signal.signal(signal.SIGINT, oldhandler) |
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137 signal.signal(signal.SIGCHLD, oldchldhandler) |
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138 |
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139 def workerfunc(): |
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140 os.close(rfd) |
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141 for i, item in func(*(staticargs + (pargs,))): |
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142 os.write(wfd, '%d %s\n' % (i, item)) |
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143 |
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144 # make sure we use os._exit in all code paths. otherwise the worker |
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145 # may do some clean-ups which could cause surprises like deadlock. |
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146 # see sshpeer.cleanup for example. |
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147 try: |
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148 scmutil.callcatch(ui, workerfunc) |
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149 except KeyboardInterrupt: |
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150 os._exit(255) |
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151 except: # never return, therefore no re-raises |
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152 try: |
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153 ui.traceback() |
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154 finally: |
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155 os._exit(255) |
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156 else: |
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157 os._exit(0) |
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159 os.close(wfd) |
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160 fp = os.fdopen(rfd, 'rb', 0) |
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161 def cleanup(): |
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162 signal.signal(signal.SIGINT, oldhandler) |
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163 waitforworkers() |
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164 signal.signal(signal.SIGCHLD, oldchldhandler) |
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165 status = problem[0] |
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166 if status: |
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167 if status < 0: |
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168 os.kill(os.getpid(), -status) |
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169 sys.exit(status) |
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170 try: |
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172 l = line.split(' ', 1) |
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173 yield int(l[0]), l[1][:-1] |
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174 except: # re-raises |
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175 killworkers() |
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176 cleanup() |
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177 raise |
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178 cleanup() |
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179 |
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180 def _posixexitstatus(code): |
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181 '''convert a posix exit status into the same form returned by |
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182 os.spawnv |
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183 |
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184 returns None if the process was stopped instead of exiting''' |
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185 if os.WIFEXITED(code): |
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186 return os.WEXITSTATUS(code) |
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187 elif os.WIFSIGNALED(code): |
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188 return -os.WTERMSIG(code) |
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189 |
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190 if pycompat.osname != 'nt': |
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191 _platformworker = _posixworker |
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192 _exitstatus = _posixexitstatus |
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193 |
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194 def partition(lst, nslices): |
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195 '''partition a list into N slices of roughly equal size |
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196 |
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197 The current strategy takes every Nth element from the input. If |
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198 we ever write workers that need to preserve grouping in input |
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199 we should consider allowing callers to specify a partition strategy. |
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200 |
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201 mpm is not a fan of this partitioning strategy when files are involved. |
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202 In his words: |
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203 |
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204 Single-threaded Mercurial makes a point of creating and visiting |
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205 files in a fixed order (alphabetical). When creating files in order, |
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206 a typical filesystem is likely to allocate them on nearby regions on |
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207 disk. Thus, when revisiting in the same order, locality is maximized |
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208 and various forms of OS and disk-level caching and read-ahead get a |
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209 chance to work. |
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210 |
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211 This effect can be quite significant on spinning disks. I discovered it |
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212 circa Mercurial v0.4 when revlogs were named by hashes of filenames. |
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213 Tarring a repo and copying it to another disk effectively randomized |
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214 the revlog ordering on disk by sorting the revlogs by hash and suddenly |
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215 performance of my kernel checkout benchmark dropped by ~10x because the |
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216 "working set" of sectors visited no longer fit in the drive's cache and |
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217 the workload switched from streaming to random I/O. |
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218 |
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219 What we should really be doing is have workers read filenames from a |
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220 ordered queue. This preserves locality and also keeps any worker from |
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221 getting more than one file out of balance. |
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222 ''' |
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223 for i in range(nslices): |
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224 yield lst[i::nslices] |